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ST490A
LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
s s
s s s s s
LOW SUPPLY CURRENT: 5mA MAX -7 TO 12 COMMON MODE INPUT VOLTAGE RANGE 70mV TYPICAL INPUT HYSTERESIS DESIGNED FOR 25Mbps OPERATION OPERATE FROM SINGLE 5 SUPPLY 4kV ESD PROTECTION CURRENT LIMITING AND THERMAL SHUTDOWN FOR DRIVER OVERLOAD PROTECTION
DIP
SOP
DESCRIPTION The ST490A is a low power transceiver for RS-485 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. ORDERING CODES
Type ST490ACN ST490ABN ST490ACD ST490ABD ST490ACDR ST490ABDR Temperature Range 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C Package
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.
Comments 50parts per tube / 40tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel
DIP-8 DIP-8 SO-8 (Tube) SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tape & Reel)
November 2002
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ST490A
PIN CONFIGURATION
PIN DESCRIPTION
PlN N 1 2 3 4 5 6 7 8 SYMBOL VCC RO DI GND Z Y B A Supply Voltage Receiver Output. Driver Input. Ground Inverting Driver Output Non-inverting Driver Output Inverting Receiver Input Non-inverting Receiver Input NAME AND FUNCTION
TRUTH TABLE (DRIVER)
INPUT DI L H Y L H OUTPUTS Z H L
TRUTH TABLE (RECEIVER)
DIFFERENTIAL INPUT A-B -0.2V between -0.2V to 0.2V -0.2V OPEN
?= Irrelevant; Z=High Impedance
OUTPUT RO H ? L H
X= Don't Care; Z=High Impedance
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VDI VY, VZ VA, VB VRO ESD Supply Voltage Driver Input Voltage Driver Output Voltage Receiver Input Voltage Receiver Output Voltage Human Boby Model Parameter 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
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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ST490A
ELECTRICAL CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol CIN CYZ COUT Parameter Input Capacitance Driver Output Capacitance Output Capacitance Test Conditions Min. Typ. 2 1.8 1.2 2.3 Max. 5 Unit mA pF pF pF ISUPPLY No Load Supply Current
TRANSMITTER ELECTRICAL CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol VOD1 VOD2 VOD3 VOD 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 (Note1) Driver Common Mode Output Voltage Change in magnitude of Driver Common Mode Output Voltage (Note1) Power Off Output Current Driver Short Circuit Output Current Input Logic Threshold Low Input Logic Threshold High Test Conditions Min. Typ. Max. VCC RL= 54 (RS-422) (Figure 1) RL= 100 (RS-422) (Figure 1) RL= 54 or 100 (Figure 1) 1.5 2 2.6 3 0 0.2 5 Unit V V V V
VOC VOC
RL= 54 (Figure 1) RL= 54 (Figure 1)
1 0
3 0.2
V V
IOFF IOSD VIL VIH
VCC = 0V
VO=-7V to 12V 35
100 250 0.8 2
A mA V V
VO=-7V to 12V
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ST490A
RECEIVER ELECTRICAL CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol IIN1 IIN2 VTH VTH VOH VOL RRIN IOSR 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
DRIVER SWITCHING CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol DR tPLH tPHL tSKEW tTLH tTHL Parameter Maximum Data Rate Propagation Delay Input to Output Differential Output Delay Skew Rise or Fall Differential Time Jitter <5% RL= 54 RL= 54 RL= 54 CL1=CL2=50pF, (Figure 1) CL1=CL2=50pF, (Figure 1) CL1=CL2=50pF, (Figure 1) Test Conditions Min. 25 Typ. 50 10 1 8 16 3 12 Max. Unit Mbps ns ns ns
RECEIVER SWITCHING CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol tPLH tPHL tSKD tTLH tTHL Parameter Propagation Delay Input to Output CL = 15pF Test Conditions (Figures 2,4) (Figures 2,4) (Figures 2,4) Min. Typ. 19 1 8 Max. 30 3 Unit ns ns ns
|tPLH - tPHL| Receiver Output CL = 15pF Skew Rise or Fall Time CL = 15pF
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ST490A
TEST CIRCUITS AND TYPICAL CHARACTERISTICS Figure 1 : Driver DC Test Load
Figure 2 : Driver/Receiver Timing Test Circuit
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ST490A
Figure 3 : Driver Propagation Delay
Figure 4 : Receiver Propagation Delay
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ST490A
Figure 5 : Receiver Output Current vs Output Voltage (Output Low) Figure 8 : Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output High)
Figure 6 : Receiver Output Current vs Output Voltage (Output High)
Figure 9 : Driver Short Circuit Current vs Line Voltage (Output High)
Figure 7 : Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output Low)
Figure 10 : Driver Short Circuit Current vs. Line Voltage (Output Low)
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ST490A
Figure 11 : Receiver Input Current vs Input Voltage
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ST490A
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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ST490A
SO-8 MECHANICAL DATA
DIM. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.149 0.015 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm. MIN. TYP MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.023 0.196 0.244 0.025 0.013 0.007 0.010 0.003 MIN. inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019
0016023
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ST490A
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com
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