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STC485E Datasheet(PDF) 6 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) 6 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
Pin Description
Function Tables
Table 1. Transmitting
Table 2. Receiving
X = Don’t care; High-Z = High impedance
X = Don’t care; High-Z = High impedance
Figure 1. STC485E / Pin Configuration and Typical Operating Circuit
INPUTS
OUTPUTS
/RE
DE
DI
B
A
MODE
X
1
1
0
1
Normal
X
1
0
1
0
Normal
0
0
X
High-Z
High-Z
Normal
1
0
X
High-Z
High-Z
Shutdown
INPUTS
OUTPUTS
/RE
DE
A, B
RO
MODE
0
X
=?
-0.05V
1
Normal
0
X
=?
-0.2V
0
Normal
0
X
Inputs Open
1
Normal
1
0
X
High-Z
Shutdown
PIN
NAME
FUNCTION
1
RO
Receiver Output. If A > B by -50mV, RO will be high; if A < B by 200mV, RO will be low.
2
/RE
Receiver Output Enable. RO is enabled when /RE is low; RO is high impedance when /RE is high. If
/RE is high and DE is low, the device will enter a low-power shutdown mode.
3
DE
Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance
when DE is low. If /RE is high and DE is low, the device will enter a low-power shutdown mode. If the
driver outputs are enabled, the parts function as line drivers. While they are high impedance, they
function as line receivers if /RE is low.
4
DI
Driver Input. A low on DI forces output A low and output B high. Similarly, a high on DI forces output
A high and output B low.
5
GND
Ground
6
A
Noninverting Receiver Input and Noninverting Driver Output
7
B
Inverting Receiver Input and Inverting Driver Output
8
VCC
Positive Supply: VCC=5V±5%
RO
Vcc
RE
DE
DI
GND
DIP/SO
Rt
DE
DI
RO
RE
RO
Vcc
RE
DE
DI
GND
STC485E
TOP VIEW
Rt
0.1uF


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