ASM485ꢁ/ASM487ꢁ/ASM±487ꢁ
ꢂIN CONFIGURATION ANS FUNCTION SꢁECRIꢂTIONE
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
CC
ADM485E/
ADM487E/
ADM1487E
B
A
TOP VIEW
(Not to Scale)
GND
Figure 2. Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
2
3
RO
RE
Receiver Output. When enabled, if A > B by 200 mV, then RO = high. If A < B by 200 mV, then RO = low.
Receiver Output Enable. A low level enables the RO; a high level places it in a high impedance state.
DE
Driver Output Enable. A high level enables the driver differential outputs, Pin A and Pin B; a low level places it
in a high impedance state.
4
DI
Driver Input. When the driver is enabled, a Logic L = low on DI forces A low and B high; a Logic H = high on DI
forces Pin A high and Pin B low.
5
6
7
8
GND
A
B
Ground Connection (0 V).
Noninverting Receiver Input A/Driver Output A.
Inverting Receiver Input B/Driver Output B.
Power Supply (5 V 5%).
VCC
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