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STC485E Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. STC485E
Description  ±15kV ESD-Protected,Slew-Rate-Limited, Fail-Safe,True RS-485 Transceivers
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Maker  ETC1 [List of Unclassifed Manufacturers]
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STC485E Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

 
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STC485E Datasheet Rev.0.1, Dec.2005
Page    of  11
STC International Limited                          http://www.mcu-memory.com
STC485E
±15kV ESD-Protected,Slew-Rate-Limited,
Fail-Safe,True RS-485 Transceivers
General Description
The STC485E is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-485 communication that contains one
driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver
inputs are open, shorted or idle. This means that the receiver output will be a logic high if all transmitters on a terminated bus are
disabled (high impedance). The STC485E features reduced slew-rate driver that minimizes EMI and reduces reflections caused by
improperly terminated cables, allowing error-free data transmission up to 500kbps. All devices feature enhanced ESD protection. All
transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model.
These transceivers typically draw 400µA of supply current when unloaded, or when fully loaded with the drivers disabled.
All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The STC485E is intended for
half -duplex communications.
Applications
RS-485 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Features
ESD Protection for RS-485 I/O Pins
±15kV— Human Body Model
±15kV— IEC 1000-4-2, Air-Gap Discharge
True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility
Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission
2nA Low-Current Shutdown Mode
–7V to +12V Common-Mode Input Voltage Range
Allows up to 256 Transceivers on the Bus
Thermal Shutdown
Current-Limiting for Driver Overload Protection
Ordering Information
Selector Guide
PART
TEMP. RANGE
PIN-PACKAGE
STC485EESA
-40°C to +85°C
8 SO
STC485EEPA
-40°C to +85°C
8 Plastic DIP
PART
NUMBER
GUARANTEED
DATA RATE
(Mbps)
Low- Power
Shutdown
SLEW-RATE
LIMITED
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
Transceivers
On
Bus
±15kV
ESD
PROTECTION
PIN
COUNT
STC485E
0.5
Yes
Yes
Yes
2
256
Yes
8


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