ADM2485

Rev. A | Page 9 of 20

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

16

15

14

B

13

A

12

11

DE OUT

10

9

ADM2485

TOP VIEW

(Not to Scale)

Figure 6. Pin Configuration

Table 8. Pin Function Description

Pin No.

Mnemonic

Function

1

D1

Transformer Driver Terminal 1.

2

D2

Transformer Driver Terminal 2.

3

Ground, Logic Side.

4

between 0.01 μF and 0.1 μF.

5

RxD

Receiver Output Data. This output is high when (A − B) > 200 mV and low when (A − B) < −200 mV. The

output is tristated when the receiver is disabled, that is, when RE is driven high.

6

RE

Receiver Enable Input. This is an active-low input. Driving this input low enables the receiver; driving it

high disables the receiver.

7

RTS

Driver Enable Input. Driving this input high enables the driver; driving it low disables the driver.

8

TxD

Driver Input. Data to be transmitted by the driver is applied to this input.

9, 11, 14, 15

Ground, Bus Side.

10

DE OUT

Driver Enable Status Output.

12

A

Pin A is put in a high impedance state to avoid overloading the bus.

13

B

Pin B is put in a high impedance state to avoid overloading the bus.

16

should be between 0.01 μF and 0.1 μF.