_______________________________________________________________________________________

7

+3.3V-Powered, EIA/TIA-562 Dual Transceiver

with Receivers Active in Shutdown

Table 1. Summary of EIA/TIA-232E/V.28 and EIA/TIA-562 Specifications

NAME

DB9 PIN

SYMBOL

5

9

Ring Indicator

GND

DB25 PIN

7

Signal Ground

1

DCD

RI

22

Received Line Signal Detector (some-

times called Data Carrier Detect)

6

2

RxD

DSR

Handshake from DCE

8

Data Set Ready

3

TxD

7

6

3

Receiver Data

2

Transmit Data

RTS

4

20

Request to Send

4

DTR

5

Data Terminal Ready

Clear to Send

8

CTS

FUNCTION

Reference point for signals

Handshake from DCE

Data from DCE

Handshake from DCE

Data from DTE

Handshake from DTE

Handshake from DTE

Handshake from DCE

CONDITION

PARAMETER

EIA/TIA-232E/V.28

SPECIFICATION

Maximum Input Level

Driver Output Resistance with Power Off

±25V

5.0V to 15.0V

Driver Output Voltage

0 Level

1 Level

-5.0V to -15.0V

300

Ω

3k

Ω to 7kΩ load

Maximum Instantaneous Slew Rate

Maximum Output Level

±25V

30V/µs

300

Ω

Up to 20kbps

Signal Rate (3k

Not defined

Maximum Driver Output Short-Circuit

Current

No load

100mA

3.0V to 15.0V

Receiver Input Thresholds

0 Level

1 Level

-3.0V to -15.0V

V.28 1ms or 3% of the period

Transition Rate on Driver Output

RS-232 4% of the period

EIA/TIA-562

SPECIFICATION

±25V

3.7V to 13.2V

-3.7V to -13.2V

±13.2V

30V/µs

Up to 20kbps

Up to 64kbps

60mA

3.0V to 15.0V

-3.0V to -15.0V

4V/µs

Table 2. DB9/DB25 Cable Connections Commonly Used for EIA/TIA-232E, EIA/TIA-562 and V.24

Asynchronous Interfaces