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ST490A
Low power high speed RS-485/RS-422 transceiver
General features
s s s s s s s
Low supply current: 5mA max -7V to 12V common mode input voltage range 70mV tipycal input hysteresis Designed for 25Mbps operation Operate from a single 5V supply 4kV ESD protection Current limiting and thermal shutdown for driver overload protection
DIP-8 SO-8
Description
The ST490A is a low power transceiver for RS485 and RS-422 communications. The device contains one driver and one receiver in full duplex configuration. The ST490A draws 5mA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5V supply. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit.
Order code
Part number ST490ACN ST490ABN ST490ACDR ST490ABDR May 2006 Temperature range 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C Package DIP-8 DIP-8 SO-8 (Tape & Reel) SO-8 (Tape & Reel) Rev 3 Packaging 50parts per tube / 40tube per box 50parts per tube / 40tube per box 2500 parts per reel 2500 parts per reel 1/17
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Contents
ST490A
Contents
1 2 3 4 5 6 7 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit and typical characteristics ......................... 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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ST490A
Pin configuration
1
Figure 1.
Pin configuration
Pin connections
Table 1.
Pin description
Symbol VCC RO DI GND Y Z B A Supply voltage Receiver output Driver input Ground Non-inverting driver output Inverting driver output Inverting receiver input Non-inverting receiver input Name and function
Pin n 1 2 3 4 5 6 7 8
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Truth tables
ST490A
2
Table 2.
Truth tables
Truth table (driver)
Inputs DI L H Y L H Outputs Z H L
Note: Table 3.
X = Don't care; Z = High impedance Truth table (receiver)
Differential inputs A-B Outputs RO H ? L H
-0.2V
between -0.2V to 0.2V
-0.2V
OPEN
Note:
X = Don't care; Z = High impedance
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ST490A
Maximum ratings
3
Table 4.
Symbol VCC VDI VY, VZ VA, VB VRO ESD
Maximum ratings
Absolute maximum ratings
Parameter Supply voltage Driver input voltage Driver output voltage Receiver input voltage Receiver output voltage Human body model Value 7 -0.5 to 7 -7.5 to 12.5 -7.5 to 12.5 -0.3 to (VCC + 0.3) 3.5 Unit V V V V V KV
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
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Electrical characteristics
ST490A
4
Table 5.
Electrical characteristics
Electrical characteristics (VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA=25C)
Parameter No load supply current Input capacitance Driver output capacitance Output capacitance Min. Typ. 2 1.8 1.2 2.3 Max. 5 Unit mA pF pF pF
Symbol ISUPPLY CIN CYZ COUT
Table 6.
Transmitter electrical characteristics (VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA=25C)
Parameter Differential drive output (no load) Differential drive output (with load) Differential drive output (with load) Change in magnitude of driver differential output voltage for complementary output states Driver common mode output voltage Change in magnitude of driver common mode output voltage Power off output current RL= 54 (RS-422) (Figure 1.) RL= 100 (RS-422) (Figure 1.) 1.5 2 2.6 3 Test conditions Min. Typ. Max. VCC 5 Unit V V V
Symbol VOD1 VOD2 VOD3 VOD
RL= 54 or 100 (Figure 1.)
0
0.2
V
VOC VOC IOFF IOSD VIL VIH
RL= 54 (Figure 1.) RL= 54 (Figure 1.) VCC = 0V, VO=-7V to 12V
1 0
3 0.2 100
V V A mA V V
Driver short circuit output current VO=-7V to 12V Input logic threshold low Input logic threshold high
35
250 0.8
2
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ST490A
Electrical characteristics
Table 7.
Receiver electrical characteristics (VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA=25C)
Parameter Logic input current Input current (A, B) Receiver differential threshold voltage Receiver input hysteresis Receiver output high voltage Receiver output low voltage Receiver input resistance Receiver short-circuit current Other input=0V VCC= 0 or 5.25V VCM = -7V to 12V VCM = 0V IOUT = -8mA, VID = 200mV IOUT = 8mA, VID = -200mV VCM = -7V to 12V VO = 0V to VCC 12 7 3.5 VIN=12V VIN=-7V -0.2 70 4.7 0.2 24 95 0.4 0.5 -0.35 Test Conditions Min. Typ. Max. 2.0 1 -0.8 0.2 Unit A mA mA V mV V V K mA
Symbol IIN1 IIN2 VTH VTH VOH VOL RRIN IOSR
Table 8.
Driver switching characteristics (VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA=25C)
Parameter Maximum data rate Propagation delay input to output Differential output delay skew Rise or fall differential time Jitter <5% RL= 54, CL1=CL2=50pF, (Figure 1.) RL= 54, CL1=CL2=50pF, (Figure 1.) RL= 54, CL1=CL2=50pF, (Figure 1.) Test Conditions Min. 25 Typ. 50 10 1 8 16 3 12 Max. Unit Mbps ns ns ns
Symbol DR tPLH tPHL tSKEW tTLH tTHL
Table 9.
Receiver Switching Characteristics (VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA=25C)
Parameter Propagation delay input to output |tPLH - tPHL| Receiver output skew Rise or fall time Test Conditions CL = 15pF, (Figure 2., Figure 4.) CL = 15pF, (Figure 2., Figure 4.) CL = 15pF, (Figure 2., Figure 4.) Min. Typ. 19 1 8 Max. 30 3 Unit ns ns ns
Symbol tPLH tPHL tSKD tTLH tTHL
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Test circuit and typical characteristics
ST490A
5
Figure 2.
Test circuit and typical characteristics
Driver DC test load
Figure 3.
Drive/receiver timing test circuit
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ST490A
Test circuit and typical characteristics
Figure 4.
Driver propagation delay
Figure 5.
Receiver propagation delay
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Test circuit and typical characteristics
ST490A
Figure 6.
Receiver output current vs. output low voltage(output low)
Figure 7.
Receiver output current vs. output high voltage (output high)
Figure 8.
Driver diff. output voltage vs Figure 9. common mode voltage (diff. output low)
Driver diff. output voltage vs common mode voltage (diff. output high)
Figure 10. driver short circuit current vs line voltage (output high)
Figure 11. Receiver high level output voltage vs. temperature
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ST490A Figure 12. Receiver input current vs input voltage
Test circuit and typical characteristics
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Package mechanical data
ST490A
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
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ST490A
Package mechanical data
Plastic DIP-8 MECHANICAL DATA
mm. DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. TYP. 0.130 MAX. inch
P001F
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Package mechanical data
ST490A

SO-8 MECHANICAL DATA
DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050

inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157
8 (max.)
0.04
0016023/C
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ST490A
Package mechanical data
Tape & Reel SO-8 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
ST490A
7
Table 10.
Date
Revision history
Revision history
Revision 2 3 Changes Typing error on table 2 - pin 5 non-inverting, pin 6 inverting. Order codes has been updated and new template.
06-Jul-2005 04-May-2006
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ST490A
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