ST491A STMicroelectronics, ST491A Datasheet

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ST491A

Manufacturer Part Number
ST491A
Description
LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
Manufacturer
STMicroelectronics
Datasheet

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ST491AB
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ST491ABDR
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DESCRIPTION
The ST491A 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 ST491A draws 5mA (typ.) of
supply current when unloaded and operates from
a single 5V supply.
ORDERING CODES
July 2003
ST491ACDR
ST491ABDR
ST491ACN
ST491ACD
ST491ABN
ST491ABD
LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
LOW SUPPLY CURRENT: 5mA MAX
DESIGNED FOR RS485 INTERFACE
APPLICATIONS
-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
Type
Temperature
-40 to 85 °C
-40 to 85 °C
-40 to 85 °C
0 to 70 °C
0 to 70 °C
0 to 70 °C
Range
SO-14 (Tape & Reel)
SO-14 (Tape & Reel)
SO-14 (Tube)
SO-14 (Tube)
Package
DIP-14
DIP-14
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.
DIP
25parts per tube / 40tube per box
25parts per tube / 40tube per box
50parts per tube / 20tube per box
50parts per tube / 20tube per box
2500 parts per reel
2500 parts per reel
Comments
SOP
ST491A
1/12

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ST491A Summary of contents

Page 1

... CURRENT LIMITING AND THERMAL SHUTDOWN FOR DRIVER OVERLOAD PROTECTION DESCRIPTION The ST491A 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 ST491A draws 5mA (typ.) of supply current when unloaded and operates from a single 5V supply ...

Page 2

... ST491A PIN CONFIGURATION PIN DESCRIPTION PlN N° SYMBOL GND 7 GND TRUTH TABLE (DRIVER) INPUT Don’t Care; Z=High Impedance 2/12 NAME AND FUNCTION Not Connected Receiver Output. ...

Page 3

... 100 (RS-422) (Figure 100 (Figure (Figure (Figure =-7V to 12V =-7V to 12V O ST491A Value Unit -7.5 to 12.5 V -7.5 to 12 25°C) A Min. Typ. Max. Unit 1 ...

Page 4

... ST491A RECEIVER ELECTRICAL CHARACTERISTICS V = 4.5V to 5.5V -40 to 85°C, unless otherwise specified. Typical values are referred Symbol Parameter I Input Current ( Receiver Differential TH Threshold Voltage V Receiver Input Hysteresis TH V Receiver Output High OH Voltage V Receiver Output Low OL Voltage R Receiver Input Resistance ...

Page 5

... TEST CIRCUITS AND TYPICAL CHARACTERISTICS Figure 1 : Driver DC Test Load Figure 2 : Receiver Timing Test Load Figure 3 : Driver/Receiver Timing Test Circuit ST491A 5/12 ...

Page 6

... ST491A Figure 4 : Driver Timing Test Load Figure 5 : Driver Propagation Delay 6/12 ...

Page 7

... Figure 6 : Receiver Propagation Delay Figure 7 : Receiver Output Current vs Output Voltage (Output Low) Figure 8 : Receiver Output Current vs Output Voltage (Output High) Figure 9 : Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output Low) Figure 10 : Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output High) ST491A 7/12 ...

Page 8

... ST491A Figure 11 : Driver Short Circuit Current vs Line Voltage (Output High) Figure 12 : Driver Short Circuit Current vs. Line Voltage (Output Low) 8/12 Figure 13 : Receiver Input Current vs Input Voltage ...

Page 9

... Plastic DIP-14 MECHANICAL DATA mm. DIM. MIN. a1 0. 15. 1.27 TYP MAX. MIN. 0.020 1.65 0.055 0.5 0.25 20 8.5 2.54 7.1 5.1 3.3 2.54 0.050 ST491A inch TYP. MAX. 0.065 0.020 0.010 0.787 0.335 0.100 0.600 0.280 0.201 0.130 0.100 P001A 9/12 ...

Page 10

... ST491A DIM. MIN 0 0. 8. 3.8 G 4 10/12 SO-14 MECHANICAL DATA mm. TYP MAX. 1.75 0.2 1.65 0.46 0.25 0.5 45˚ (typ.) 8.75 6.2 1.27 7.62 4.0 5.3 1.27 0.68 ˚ (max.) 8 inch MIN. TYP. MAX. 0.068 0.003 0.007 0.064 0.013 0.018 0.007 0.010 0.019 0.336 0.344 0.228 0.244 0.050 0.300 0.149 0.157 0.181 ...

Page 11

... Tape & Reel SO-14 MECHANICAL DATA mm. DIM. MIN 12 2.1 Po 3.9 P 7.9 TYP MAX. MIN. 330 13.2 0.504 0.795 2.362 22.4 6.6 0.252 9.2 0.354 2.3 0.082 4.1 0.153 8.1 0.311 ST491A inch TYP. MAX. 12.992 0.519 0.882 0.260 0.362 0.090 0.161 0.319 11/12 ...

Page 12

... ST491A 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 ...

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