st485c STMicroelectronics, st485c Datasheet

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st485c

Manufacturer Part Number
st485c
Description
Low Power Rs-485/rs-422 Transceiver
Manufacturer
STMicroelectronics
Datasheet

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Features
Description
The ST485 is al low power transceiver for RS-485
and RS-422 communication. Each part contains
one driver and one receiver.
This transceiver draw 300 µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
It operates from a single 5 V supply.
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that placed the driver
outputs into a high-impedance state.
The ST485 is designed for bi-directional data
communications on multipoint bus transmission
line (half-duplex applications).
Table 1.
February 2008
Low quiescent current: 300 µA
Designed for RS-485 interface application
-7 V to 12 V common mode input voltage range
Driver maintains high impedance in 3-state or
with the power OFF
70 mV typical input hysteresis
30 ns propagation delay, 5 ns skew
Operate from a single 5 V supply
Current limiting and thermal shutdown for
driver overload protection
Allows up to 64 transceivers on the bus
Order code
ST485CDR
ST485BDR
ST485CN
ST485BN
Device summary
Temperature range
-40 to 85 °C
-40 to 85 °C
0 to 70 °C
0 to 70 °C
Low power RS-485/RS-422 transceiver
SO-8 (tape and reel)
SO-8 (tape and reel)
Rev 15
Package
DIP-8
DIP-8
The ST485 is available in three temperature
range: commercial (0 °C to 70 °C), industrial (-40
°C to 85 °C) and automotive (-55 °C to 125 °C).
DIP-8
50 parts per tube / 40 tube per box
50 parts per tube / 40 tube per box
2500 parts per reel
2500 parts per reel
Packaging
SO-8
ST485B
ST485C
www.st.com
1/19
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st485c Summary of contents

Page 1

... Package DIP-8 50 parts per tube / 40 tube per box DIP-8 50 parts per tube / 40 tube per box SO-8 (tape and reel) SO-8 (tape and reel) Rev 15 ST485B ST485C SO-8 Packaging 2500 parts per reel 2500 parts per reel 1/19 www.st.com 19 ...

Page 2

Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

Pin configuration Figure 1. Pin connections Table 2. Pin description Pin n° Symbol RO Receiver output RE Receiver output enable DE Driver output enable DI Driver input GND Ground A Non-inverting ...

Page 4

Truth tables Table 3. Truth table (driver) Inputs Note Don’t care High impedance Table 4. Truth table (receiver) Inputs ...

Page 5

Maximum ratings Table 5. Absolute maximum ratings Symbol V Supply voltage CC V Control input voltage (RE, DE Driver input voltage (DI Driver output voltage ( Receiver input voltage ( ...

Page 6

Electrical characteristics Table 6. DC electrical characteristics ± °C) A Symbol Parameter Differential driver output V OD1 (no load) Differential driver output V OD2 (with load) Change ...

Page 7

Table 6. DC electrical characteristics (continued ± °C) A Symbol Parameter Driver short-circuit I OSD1 current, V =High O Driver short-circuit I OSD2 current, V =Low O Receiver ...

Page 8

Table 8. Receiver switching characteristics = 5 V ± 5 °C) A Symbol Parameter t Propagation delay input PLH t to output PHL Differential receiver t SKD skew t Output enable time ...

Page 9

Test circuit and typical characteristics Figure 2. Driver DC test load Figure 4. Drive/receiver timing test circuit Figure 3. Receiver timing test load Figure 5. Driver timing test load 9/19 ...

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Figure 6. Driver propagation delay Figure 7. Driver enable and disable time 10/19 ...

Page 11

Figure 8. Receiver propagation delay Figure 9. Receiver enable and disable time 11/19 ...

Page 12

Figure 10. Receiver output current vs output low voltage Figure 12. Driver output current vs output low voltage Figure 14. Supply current vs temperature 12/19 Figure 11. Receiver output current vs output high voltage Figure 13. Driver output current vs ...

Page 13

Figure 16. Receiver low level output voltage vs temperature Figure 17. Differential driver output voltage vs temperature 13/19 ...

Page 14

Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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 ...

Page 15

Plastic DIP-8 mechanical data mm. Dim. Min. Typ. A 3.3 a1 0.7 B 1.39 B1 0.91 b 0 8.8 e 2.54 e3 7. 3.3 Z 0.44 inch. Max. Min. Typ. 0.130 ...

Page 16

Dim. Min. A 1.35 A1 0.10 A2 1.10 B 0.33 C 0.19 D 4. 5.80 h 0.25 L 0.40 k ddd 16/19 SO-8 mechanical data mm. Typ. Max. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 1.27 ...

Page 17

Tape & reel SO-8 mechanical data mm. Dim. Min. Typ 12 8.1 Bo 5.5 Ko 2.1 Po 3.9 P 7.9 inch. Max. Min. Typ. 330 13.2 0.504 0.795 2.362 22.4 8.5 0.319 ...

Page 18

Revision history Table 9. Document revision history Date Revision 21-Mar-2006 12 02-Aug-2006 13 08-Nov-2006 14 07-Feb-2008 15 18/19 Changes Order codes has been updated and new template. Mistake in cover page first row mA ==> µA. Added: Table 1. ...

Page 19

... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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