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SP3070E - SP3078E Family
15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers
FEATURES 15kV ESD protection for RS485 pins 3.3V low-power operation Advanced Receiver-failsafe protection for open, shorted or terminated lines Up to 256 Transceivers may share Bus Very low load for 8x greater fanout Hot Swap glitch protection RE and DE Thermal shutdown protects against driver contention Available in three industry standard footprints
SP3070E, 3073 and 3076 in Full-Duplex (14 pin) SP3071E, 3074 and 3077 in Full-Duplex (8 pin) SP3072E, 3075 and 3078 in Half-Duplex (8 pin)
NC 1 RO 2 RE 3 DE 4 DI 5 GND 6 GND 7
14 VCC
RO 1 RE 2 DE 3 DI 4
8 PIN NSOIC
SP3072E SP3075E SP3078E Half Duplex
8 VCC 7B 6A 5 GND
VCC 1 RO 2 DI 3 GND 4
8 PIN NSOIC
SP3071E SP3074E SP3077E Full Duplex
8A 7B 6
Z
5Y
Three applications-optimized speed grades
SP3070-72E: 250kbps slew-limited SP3073-75E: 500kbps slew-limited SP3076-78E: 16Mbps high speed
14 Pin NSOIC SP3070E SP3073E SP3076E Full Duplex
13 NC 12 A 11 B 10 Z 9Y 8 NC
Small form factor SO-narrow packages Industrial (-40 to +85C) and Extended (-40 to +85C) temperature grades
Now Available in Lead Free Packaging
APPLICATIONS Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale DESCRIPTION The SP3070-3078E differential line transceivers are suitable for bidirectional communication on balanced multipoint bus transmission lines and comply with both RS485 and RS422 EIA Standards. Each device consists of a differential driver and differential receiver. All devices operate from a 3.3V power supply. High receiver input impedance allows a large number of transceivers to share a common data bus while maintaining signal margin and without excessive loading or use of expensive repeaters. The high impedance driver output is maintained over the entire common-mode voltage range from -7 to +12V. Receivers will failsafe to logic 1 output when inputs are open, shorted or terminated. Drivers include built-in short-circuit protection and a thermal-overload shutdown to protect against excessive power dissipation from bus contention or cable faults. All RS485 inputs are ESD protected up to 15kV (Air-Gap and Human Body Model) and up to 8kV Contact discharge (IEC 1000-4-2).
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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DEVICE ARCHITECTURE AND BLOCK DIAGRAMS Devices are available in three industry standard architectures and footprints. In each footprint there are three speed grades available.
NC R
1 2
R
REB 3 4 DE D5 6 GND 7 GND D
14 VCC 13 NC 12 A 11 B 10
14 Pin Full Duplex: SP3070E, 250kbps slew limited SP3073E, 500kbps slew limited SP3076E, 16Mbps
Z
9Y 8 NC
VCC 1 R 2 R
8A 7B 6
8 Pin Full Duplex: SP3071E, 250kbps slew limited SP3074E, 500kbps slew limited SP3077E, 16Mbps
D GND
3 4
Z
D
5Y
RO
1
R
8 VCC 7B 6A
8 Pin Half Duplex: SP3072E, 250kbps slew limited SP3075E, 500kbps slew limited SP3078E, 16Mbps
2 RE DE 3 4 DI
D
5
GND
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC.....................................................................................................+6.0V Input Voltage at control input pins (RE, DE).........................-0.3V to 6V Driver Input Voltage (RE, DE)...............................................-0.3V to 6V Driver Output Voltage (A, B, Y, & Z)....................................-8V to +13V Receiver Input Voltage (A, B)..............................................-8V to +13V Continuous Power Dissipation at Ta = 70oC 8-pin SO (derate 5.88mW/oC above +70oC)................................471mW 8-pin PDIP (derate 9.29mW/oC above +70oC)............................727mW 14-pin SO (derate 8.33mW/oC above +70oC).............. .............667mW 14-pin PDIP (derate 10mW/oC above +70oC).................. ..........800mW Operating Temperature Ranges SP307_EMN.................................................................-40C to +125C SP307_EEN ...............................................................-40C to +85C Junction Temperature............................................................. ..+150C Storage Temperature Range..........................................-65C to +150 C Lead Temperature (soldering, 10s) ........................................... +300 C
ELECTRICAL CHARACTERISTICS
Unless otherwise noted VCC = +3.3 0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3, ambient temperature TA = +25C. The denotes the specifications which apply over the full operating range unless otherwise noted.
PARAMETER SYM. MIN. 2 Differential Driver Output VOD 1.5 TYP. MAX. VCC VCC VCC Change in Magnitude of Differential Output Voltage Driver Common Mode Output Voltage Change in Magnitude of Common Mode Output Voltage Input High Voltage Input Low Voltage Input Hysteresis Input Current Input Impedance First Transition (Hotswap) Output Leakage (Y and Z) Full Duplex (A and B) VOD VOC VCC/2 0.2 3 V V V UNITS CONDITIONS RL = 100 (RS-422), Figure 1 RL = 54 (RS-485), Figure 1 No Load RL = 54 or 100 , Figure 1 RL = 54 or 100 , Figure 1
VOC VIH VIL VHYS IIN -1 1 100 2
0.2
V V
RL = 54 or 100 , Figure 1 DE, DI, RE DE, DI, RE DE, DI, RE DE, DI, RE DE, RE First transition will draw more current (Hotswap) DE = GND VCC = GND or 3.6V VIN = +12 V VIN = -7V
0.8
V mV
1 10 +125
A k
IO
A -100 0 250 mA -250 0
Driver Short-Circuit Current
IOSD
-7V VOUT 12V, (Figure 4A)
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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ELECTRICAL CHARACTERISTICS
Unless otherwise noted VCC = +3.3 0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3, ambient temperature TA = +25C. The denotes the specifications which apply over the full operating range unless otherwise noted.
PARAMETERS
SYM
MIN
TYP
MAX 125
UNITS
CONDITIONS VIN = +12V VIN = -7V
Input Current (A and B) Half Duplex Thermal-Shutdown Threshold Thermal Shutdown Hysteresis RECEIVER Receiver Differential Threshold (Sensitivity) Receiver Input Hysteresis RO Output High Voltage RO Output Low Voltage Tri-State Output Current at Receiver Receiver Input Resistance Receiver Output Short-Circuit Current SUPPLY CURRENT
IA,B -100 TTS TTSH 165 15
A
DE = GND VCC = GND or 3.6
C C

VTH VTH VOH VOL IOZR RIN IOZR
-200
-125 15
-50
mV mV V
-7V VCM 12V Va + Vb = 0V IO = -1mA IO = 1mA 0 VO VCC -7V VCM 12V 0V VRO VCC
Vcc 0.6 0.4 +/-1 96 60
V A k mA
0.8 Supply Current ICC 0.8 0.8 Supply Current in Shutdown mode ESD PROTECTION 15 ESD Protection for Y, Z, A, and B 15 8 ISHDN 0.05
1.5 1.5 1.5 3 A mA
No Load, RE = 0, DE = VCC No Load, RE = VCC, DE = VCC No Load, RE = 0, DE = 0 RE = VCC, DE = GND
Human Body Model kV Air Gap (IEC 1000-4-2) Contact (IEC 1000-4-2)
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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DRIVER SWITCHING CHARACTERISTICS
Unless otherwise noted VCC = +3.3 0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3, ambient temperature TA = +25C.
SP3070E, SP3071E & SP3072E DRIVER SWITCHING CHARACTERISTICS PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Differential Output Skew (tDPLH - t DPHL) Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Time to Shutdown tDZH tDZL tDLZ tDHZ tDZH(SHDN) tDZL(SHDN) tSHDN SYMBOL tDPLH tDPHL tDR, tDF tDSKEW MIN. 250 250 350 250 50 TYP. 200 MAX. 1500 1500 1600 200 2500 2500 100 100 5500 5500 600 UNITS ns ns ns ns kbps ns ns ns ns ns ns ns Figure 4 Figure 5 Figure 5 Figure 4 Figure 4 Figure 5 CONDITIONS CL = 50pF, RL = 54 , Figure 2 & 3 CL = 50pF, RL = 54 , Figure 2 & 3 CL = 50pF, RL = 54 , Figure 2 & 3
RECEIVER SWITCHING CHARACTERISTICS
Unless otherwise noted VCC = +3.3 0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3, ambient temperature TA = +25C.
Receiver Switching Characteristics SP3070, SP3071 & SP3072 PARAMETER Receiver Propagation Delay Receiver Output Skew (tDPLH - tDPHL) Data Rate Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Outtput Low tRZH tRZL tRLZ tRHZ tRZH(SHDN) tRZL(SHDN) SYMBOL tRPLH tRPHL tRSKEW MIN. 250 TYP. MAX. 200 200 30 50 50 200 100 4000 4000 UNITS ns ns ns kbps ns ns ns ns ns ns Figure 8 Figure 8 Figure 8 Figure 8 Figure 8 Figure 8 CL = 15pF, Figure 6 & 7 CL = 15pF, Figure 6 & 7 CONDITIONS
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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DRIVER SWITCHING CHARACTERISTICS
Unless otherwise noted VCC = +3.3 0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3, ambient temperature TA = +25C.
SP3073E, SP3074E & SP3075E DRIVER SWITCHING CHARACTERISTICS PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Differential Output Skew (tDPLH - tDPHL) Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Time to Shutdown tDZH tDZL tDLZ tDHZ tDZH(SHDN) tDZL(SHDN) tSHDN SYMBOL tDPLH tDPHL tDR, tDF tDSKEW MIN. 180 180 200 500 50 TYP. 200 MAX. 800 800 800 100 2500 2500 100 100 4500 4500 600 UNITS ns ns ns ns kbps ns ns ns ns ns ns ns Figure 4 Figure 5 Figure 5 Figure 4 Figure 4 Figure 5 CONDITIONS CL = 50pF, RL = 54 , Figure 2 & 3 CL = 50pF, RL = 54 , Figure 2 & 3 CL = 50pF, RL = 54 , Figure 2 & 3
RECEIVER SWITCHING CHARACTERISTICS
Unless otherwise noted VCC = +3.3 0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3, ambient temperature TA = +25C.
Receiver Switching Characteristics SP3073, SP3074 & SP3075 PARAMETER Receiver Propagation Delay Receiver Output Skew (tDPLH - tDPHL) Maximum Data Rate Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Outtput Low Time to Shutdown
Date: 03/28/05
SYMBOL tRPLH tRPHL tRSKEW
MIN. 500
TYP. 200
MAX. 200 200 30 50 50 50 50 4000 4000 600
UNITS ns ns ns kbps ns ns ns ns ns ns ns
CONDITIONS CL = 15pF, Figure 6 & 7 CL = 15pF, Figure 6 & 7
tRZH tRZL tRLZ tRHZ tRZH(SHDN) tRZL(SHDN) tSHDN
50
Figure 8 Figure 8 Figure 8 Figure 8 Figure 8 Figure 8
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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DRIVER SWITCHING CHARACTERISTICS
Unless otherwise noted Vcc=+3.30.3V, ambient temperature Tmin < Ta < Tmax. Typical values are at Vcc = 3.3, ambient temperature Ta = +25C
SP3076E, SP3077E & SP3078E DRIVER SWITCHING CHARACTERISTICS PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Differential Output Skew (tDPLH - tDPHL) Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Time to Shutdown tDZH tDZL tDLZ tDHZ tDZH(SHDN) tDZL(SHDN) tSHDN SYMBOL tDPLH tDPHL tDR, tDF tDSKEW MIN. 16 50 TYP. 200 MAX. 50 50 15 8 150 150 100 100 1800 1800 600 UNITS ns ns ns ns Mbps ns ns ns ns ns ns ns Figure 4 Figure 5 Figure 5 Figure 4 Figure 4 Figure 5 CONDITIONS CL = 50pF, RL = 54 , Figure 2 & 3 CL = 50pF, RL = 54 , Figure 2 & 3 CL = 50pF, RL = 54 , Figure 2 & 3
RECEIVER SWITCHING CHARACTERISTICS
Unless otherwise noted Vcc=+3.30.3V, ambient temperature Tmin < Ta < Tmax. Typical values are at Vcc = 3.3, ambient temperature Ta = +25C
Receiver Switching Characteristics SP3076, SP3077 & SP3078 PARAMETER Receiver Propagation Delay Receiver Output Skew (tDPLH - tDPHL) Data Rate Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low Time to Shutdown
Date: 03/28/05
SYMBOL tRPLH tRPHL tRSKEW
MIN. 16
TYP. 40 40 200
MAX. 75 75 8 60 60 50 50 1800 1800 600
UNITS ns ns ns Mbps ns ns ns ns ns ns ns
CONDITIONS CL = 15pF, Figure 6 & 7, -40 to +85C CL = 15pF, Figure 6 & 7,
tRZH tRZL tRLZ tRHZ tRZH(SHDN) tRZL(SHDN) tSHDN
50
Figure 8, -40 to +85C Figure 8, -40 to +85C Figure 8 Figure 8 Figure 8 Figure 8
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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FIGURE 1. DRIVER DC TEST CIRCUIT
FIGURE 2. RECEIVER DC TEST CIRCUIT
A
R/2 DI 0 or 3V VCC D VOD R/2 VOC
VID
B
R RE
OUT
FIGURE 3. DRIVER PROPAGATION DELAY TIME TEST CIRCUIT AND TIMING DIAGRAM
Y DI D Z 3.3V VOD
RL 54
CL 50pF
VCC DI 0 Z Y VO VDIFF -VO
VCC/2
tPLH
tPHL
VO 1/2 VO 10% tR VDIFF = V(Y) - V(Z) 90% 90% 1/2 VO 10% tF
VSKEW = tPLH - tPHL
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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FIGURE 4. DRIVER ENABLE & DISABLE TIMES TEST CIRCUIT & TIMING DIAGRAM
Y 0 or VCC DI D Z
S1 OUT CL = 50pF RL = 500
GENERATOR
50
VCC DE VCC /2 tZL, tZL(SHDN VOM = (VOL+ VCC)/2 OUT 0.25V tLZ 0 0
FIGURE 4A. DRIVER CONTENTION TEST
DE = 0 or 3V DI = 0 or 3V D B/Z 100 -7V to +12V V A/Y IOSD
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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FIGURE 5. DRIVER ENABLE & DISABLE TIMES TEST CIRCUIT & TIMING DIAGRAM
VCC S1 RL = 500 OUT Z CL = 50pF
Y 0 or VCC DI D
GENERATOR
50
VCC DE VCC OUT VOL VOM = (VOL+ VCC)/2 VCC /2 tZL, tZL(SHDN tLZ 0.25V 0
FIGURE 6. RECEIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM
A VID B R RE OUT CL 15pF
A B tPHL OUT 1.5V tPLH
+1V -1V VOH VOL
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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FIGURE 7. RECEIVER ENABLE & DISABLE TIMES TEST CIRCUIT
1.5V -1.5V
S3
S1 B A R RE 1k S2 VCC
CL = 15pF
GENERATOR
50
FIGURE 8. RECEIVER ENABLE & DISABLE TIMING DIAGRAM
S1 is open S2 is closed S3 = 1.5V 3V 1.5V RE tZH, tZH(SHDN) VOH OUT
S1 is closed, S2 is open, S3 = -1.5V 3V 1.5V tZL, tZL(SHDN) 0V VCC
RE
VOH/2
0V
OUT
VOL = VCC/2 VOL
S1 is open S2 is closed S3 = 1.5V 3V RE 0.25V OUT 1.5V tHZ VOH 0V
S1 is closed, S2 is open, S3 = -1.5V 3V 1.5V tLZ 0V VCC
RE
OUT
0.25V VOL
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
11
FUNCTION TABLES
SP3070E, SP3073E, SP3076E (Full Duplex) TRANSMITTING Inputs RE X X 0 1 DE 1 1 0 0 DI 1 0 X X Z 0 1 High-Z Shutdown Outputs Y 1 0
SP3070E, SP3073E, SP3076E (Full Duplex) RECEIVING Inputs RE 0 0 X 1 1 DE X X X 1 0 A, B -50mV -200mV Open, Shorted X X Output RO 1 0 1 High-Z Shutdown
SP3071E, SP3074E, SP3077E (Full Duplex) TRANSMITTING Inputs DI 1 0 Z 0 1 Outputs Y 1 0
SP3071E, SP3074E, SP3077E (Full Duplex) RECEIVING Inputs A, B -50mV -200mV Open/shorted Output RO 1 0 1
SP3072E, SP3075E, SP3078E (Half Duplex) TRANSMITTING Inputs RE X X 0 1 DE 1 1 0 0 DI 1 0 X X Outputs B/Z 0 1 High-Z Shutdown A/Y 1 0
SP3072E, SP3075E, SP3078E (Half Duplex) RECEIVING Inputs RE 0 0 X 1 1 DE X X X 1 0 A, B -50mV -200mV Open/shorted X X Output RO 1 0 1 High-Z Shutdown
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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PIN DESCRIPTION
HALF DUPLEX DEVICES SP3072E SP3075E SP3078E PIN NAME PIN FUNCTION
FULL DUPLEX DEVICES SP3070E SP3073E SP3076E SP3071E SP3074E SP3077E PIN NUMBER 2 2
1
RO
Receiver Output. When RE is low and if (A - B) -50mV, RO is High. If (A - B) - 200mV, RO is low. Receiver Output Enable. When RE is low, RO is enabled. When RE is high, RO is high impedance. RE should be high and DE low to enter shutdown mode. RE is a hotswap input. Driver Output Enable. When DE is high, outputs are enabled. When DE is low, outputs are high impedance. DE should be low and RE high to enter shutdown mode. DE is a hot-swap input. Driver Input. With DE high, a low level on DI forces noninverting output low and inverting output high. Similarly, a high level on DI forces noninverting output high and inverting output low. Ground Noninverting Driver Output Inverting Driver Output Inverting Receiver Input Inverting Receiver Input and Inverting Driver Output Noninverting Receiver Input Noninverting Receiver Input and Noninverting Driver Output Positive Supply VCC. Bypass VCC to GND with a 0.1uF capacitor. No Connect
3
-
2
RE
4
-
3
DE
5
3
4
DI
6, 7 9 10 11 12 14 1, 8, 13
4 5 6 7 8 1 -
5 7 6 8 -
GND Y Z B B A A VCC NC
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
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DETAILED DESCRIPTION DETAILED DESCRIPTION The SP307XE family of high speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled. The SP3070E, SP3072E, SP3073E, SP3075E, SP3076E and SP3078E also feature a hotswap capability allowing live insertion without error data transfer. The SP3070E, SP3071E and SP3072E feature reduced slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. The SP3073E, SP3074E and SP3075E also offer slew -rate limits allowing transmit speeds up to 500kbps. The SP3076E, SP3077E, SP3078E driver slew rates are not limited, making transmit speeds up to 16Mbps possible. The SP3072E, SP3075E and SP3078E are half-duplex transceivers, while the SP3070E, SP3071E, SP3073E, SP3074E, SP3076E, and SP3077E are full duplex transceivers. All devices operate from a single 3.3V supply. Drivers are output short-circuit current limited. Thermal-shutdown circuitry protects drivers against excessive power dissipation. When activated, the thermal-shutdown circuitry places the driver outputs into a high-impedance state. RECEIVER INPUT FILTERING SP3070-SP3075 receivers incorporate input filtering in addition to input hysteresis. This filtering enhances noise immunity with differential signals that have very slow rise and fall times. Receiver propagation delay increases by 25% due to this filtering. FAIL SAFE The SP3070 family guarantees a logic-high receiver output when the receiver inputs are shorted, open, or when they are connected to a terminated transmission line with all drivers
Date: 03/28/05
disabled. If A - B is less than or equal to 200mV, RO is logic low. In the case of a terminated bus with all transmitters disabled the receiver's differential input voltage is pulled to 0V by the termination. With the receiver thresholds of the SP3070E family, this results in a logic high with a 50mV minimum noise margin. In compliance with the EIA/TIA-485 standard, the SP3070E family has a 50mV 200mV threshold. HOT-SWAP CAPABILITY When circuit boards are inserted into a hot backplane, differential disturbances to the data bus can lead to data errors. Upon initial circuit board insertion, the data communication processor undergoes its own power-up sequence. During this period, the processor's logic-output drivers are high impedance and are unable to drive the DE and RE inputs of these devices to a defined logic level. Leakage currents up to 10A from the high-impedance state of the processor's logic drivers could cause standard CMOS enable inputs of a transceiver to drift to an incorrect logic level. Additionally, parasitic circuit board capacitance could cause coupling of VCC or GND to the enable inputs. Without the hot-swap capability, these factors could improperly enable the transceiver's driver or receiver. When VCC rises, an internal pulldown circuit holds DE low and RE high for approximately 10 microseconds. After the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input. 15KV ESD PROTECTION As with all Sipex devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver inputs of the SP3070E family of devices have extra protection against static electricity. Sipex's engineering team have developed state of the art structures to protect these pins against ESD of 15kV without damage. The ESD structures withstand high ESD in all states: normal op(c) Copyright 2005 Sipex Corporation
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
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DETAILED DESCRIPTION eration, shutdown, and powered down. After an ESD event, the SP3070E - SP3078E keep working without latchup or damage. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the SP3070E - SP3078E are characterized for protection to the following limits: 15kV using the Human Body Model 8kV using the Contact Discharge method specified in IEC 1000-4-2 15kV Airgap ESD TEST CONDITIONS ESD performance depends on a variety of conditions. Contact Sipex for a reliability report that documents test setup, methodology and results. IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The SP3070E family of devices helps you design equipment to meet IEC 1000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 10004-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to EC 1000-4-2 is generally lower than that measured using the human body model. The air-gap test involves approaching the device with a charged probe. The contactdischarge method connects the probe to the device before the probe is energized. MACHINE MODEL The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. 256 TRANSCEIVERS ON THE BUS The standard RS-485 receiver input impedance is 12k (1 unit load), and the standard driver can drive up to 32 unit loads. The SP3070E family of transceivers has a 1/8unit load receiver input impedance (96), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices as well as other RS-485 transceivers with a total of 32 unit loads or fewer can be connected to the line. REDUCED EMI AND REFLECTIONS The SP3070E, SP3071E and SP3072E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing errorfree data transmission up to 250kbps. The SP3073, SP3074 and SP3075 offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. LOW POWER SHUTDOWN MODE Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the devices typically draw only 50nA of supply current. RE and DE can be driven simultaneously; the parts are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown. Enable times tZH and tZL assume the part was not in a low-power shutdown state. Enable times tZH(SHDN) and tZL(SHDN) assume the parts were shut down. It takes drivers and receivers longer to become enabled from low-power shutdown mode tZH(SHDN) and tZL(SHDN) than from driver/receiver-disable mode (tZH, tZL)
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
15
DETAILED DESCRIPTION DRIVER OUTPUT PROTECTION Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. First, current limit on the ouput stage, provides immediate protection against short circuits over the whole common-mode voltage range. Second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. LINE LENGTH The RS-485/RS422 standard covers line lengths up to 4000ft. TYPICAL APPLICATIONS The SP3072E, SP3075E and SP3078E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. To minimize reflections, terminate the line at both ends in its characteristic impedance, and keep stub lengths off the main line as short as possible. The slew-rate-limited SP3070 - SP3075E are more tolerant of imperfect termination.
PARTS SELECTOR GUIDE
PART NUMBER SP3070E SP3071E SP3072E SP3073E SP3074E SP3075E SP3076E SP3077E SP3078E Half/Full Duplex Full Full Half Full Full Half Full Full Half Datarate Mbps 0.2 5 0.25 0.25 0.5 0.5 0.5 16 16 16 Shutdown Yes No Yes Yes No Yes Yes No Yes Receiver Driver Enable Yes No Yes Yes No Yes Yes No Yes Trans. On Bus 256 256 256 256 256 256 256 256 256 Pin Count 14 8 8 14 8 8 14 8 8 Industry Standard Pinout MAX3070E, 75180 MAX 3071E, 75179 MAX 3072E, 75176 MAX 3073E, 75180 MAX 3074E, 75179 MAX 3075E, 75176 MAX 3076E, 75180 MAX3077E, 75179 MAX 3078E, 75176 SP3494 SP3491 SP3490 SP3485, SP3481 SP3493 SP3483 Pin Compatible Upgrade from:
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
16
PACKAGE: 8 PIN NSOIC
D e O
E/2 E1/2 E1 L2 E Seating Plane O1 L1
1
L Gauge Plane
O
INDEX AREA (D/2 X E1/2)
b
VIEW C
TOP VIEW
A
A1 Seating Plane A2
SIDE VIEW
8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 4.90 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 o 0 8 o1 5 15 Note: Dimensions in (mm)
B B
SEE VIEW C
b
c
BASE METAL
SECTION B-B WITH PLATING
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
17
PACKAGE: 14 PIN NSOIC
D O e
E/2 E1 E1/2 E Seating Plane O1 L1 1 INDEX AREA (D/2 X E1/2) L Gauge Plane L2 O
VIEW C
b
TOP VIEW
A
A1 Seating Plane A2
SIDE VIEW
14 Pin NSOIC JEDEC MO-012 (AB) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.25 8.65 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 o 0 8 o1 5 15 Note: Dimensions in (mm)
B B
SEE VIEW C
b
c
BASE METAL
SECTION B-B WITH PLATING
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
18
ORDERING INFORMATION
Model Temperature Range Package SP3070EEN .................................................... -40C to +85C ..................................................... 14-pin NSOIC SP3070EEN/TR .............................................. -40C to +85C ..................................................... 14-pin NSOIC SP3070EMN .................................................. -40C to +125C .................................................... 14-pin NSOIC SP3070EMN/TR ............................................ -40C to +125C .................................................... 14-pin NSOIC SP3071EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC SP3071EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC SP3071EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC SP3071EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC SP3072EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC SP3072EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC SP3072EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC SP3072EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC SP3073EEN .................................................... -40C to +85C ..................................................... 14-pin NSOIC SP3073EEN/TR .............................................. -40C to +85C ..................................................... 14-pin NSOIC SP3073EMN .................................................. -40C to +125C .................................................... 14-pin NSOIC SP3073EMN/TR ............................................ -40C to +125C .................................................... 14-pin NSOIC SP3074EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC SP3074EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC SP3074EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC SP3074EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC SP3075EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC SP3075EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC SP3075EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC SP3075EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC SP3076EEN .................................................... -40C to +85C ..................................................... 14-pin NSOIC SP3076EEN/TR .............................................. -40C to +85C ..................................................... 14-pin NSOIC SP3076EMN .................................................. -40C to +125C .................................................... 14-pin NSOIC SP3076EMN/TR ............................................ -40C to +125C .................................................... 14-pin NSOIC SP3077EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC SP3077EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC SP3077EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC SP3077EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC SP3078EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC SP3078EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC SP3078EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC SP3078EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC For availability of PDIP or other packaging contact factory. Available in lead free packaging. To order add "-L" suffix to part number. Example: SP3074EEN/TR = standard; SP3074EEN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,500 for NSOIC.
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Sipex Corporation
Corporation
ANALOG EXCELLENCE
Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Date: 03/28/05
SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers
(c) Copyright 2005 Sipex Corporation
19

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