adm2491e Analog Devices, Inc., adm2491e Datasheet - Page 7

• Manufacturer Part Number: adm2491e
• Description: High Speed, Esd-protected, Half-/full-duplex, Icoupler Isolated Rs-485 Transceiver
• Manufacturer: Analog Devices, Inc.

PIN CONFIGURATION AND FUNCTIONAL DESCRIPTIONS
Table 8. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
V
GND
RxD
RE
DE
TxD
NC
GND
GND
NC
Y
Z
B
A
GND
V
DD1
DD2
1
1
2
2
Description
Power Supply (Logic Side). Decoupling capacitor to GND
0.01 μF and 0.1 μF.
Ground (Logic Side).
Receiver Output.
Receiver Enable Input. Active low logic input. When this pin is low, the receiver is enabled; when high, the
receiver is disabled.
Driver Enable Input. Active high logic input. When this pin is high, the driver (transmitter) is enabled;
when low, the driver is disabled.
Transmit Data.
No Connect. This pin must be left floating.
Ground (Logic Side).
Ground (Bus Side).
No Connect. This pin must be left floating.
Driver Noninverting Output.
Driver Inverting Output.
Receiver Inverting Input.
Receiver Noninverting Input.
Ground (Bus Side).
Power Supply (Bus Side). Decoupling capacitor to GND
0.01 μF and 0.1 μF.
Figure 2. ADM2491E Pin Configuration
GND
GND
V
RxD
TxD
DD1
RE
DE
NC
1
1
1
2
3
4
5
6
7
8
NC = NO CONNECT
Rev. 0 | Page 7 of 16
(Not to Scale)
ADM2491E
TOP VIEW
16
15
14
13
12
11
10
9
V
GND
A
B
Z
Y
NC
GND
DD2
2
2
2
required; capacitor value should be between
1
required; capacitor value should be between
ADM2491E