Programmable DTE/DCE,

+5V RS-232 Transceiver

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11

PARAMETER

CONDITIONS

Driver Output

Resistance

Transition Rate on

Driver Output

V.28

Instantaneous

Slew Rate, Max

3k

Ω to 7kΩ load

300

Ω

100mA

30V/

µs

+5.0V to +15V

-5.0V to -15V

3k

Ω to 7kΩ load

3k

EIA/TIA-232E

4% of the period

EIA/TIA-232E, V.28

SPECIFICATIONS

Driver Output

Voltage

0 Level

1 Level

Output Level, Max

Driver Output

Short-Circuit

Current, Max

1ms or 3% of the

period

DB9 PIN

DB25 PIN

NAME

SYMBOL

FUNCTION

1

8

DCD

Handshake from DCE

2

3

Receive Data

RxD

Data from DCE

3

2

Transmit Data

Data from DTE

4

20

Data Terminal Ready

DTR

Handshake from DTE

5

7

Signal Ground

GND

6

6

Data Set Ready

DSR

Handshake from DCE

7

4

Request to Send

RTS

Handshake from DTE

8

5

Clear to Send

CTS

Handshake from DCE

9

22

Ring Indicator

RI

Handshake from DCE

Reference point for signals

Received Line Signal Detector, sometimes

called Data Carrier Detect

TxD

Table 3. Summary of EIA/TIA-232E, V.28

Specifications

Table 4. DB9/DB25 Cable Connections Commonly Used for EIA/TIA-232 and V.24

Asynchronous Interfaces

Data Rate

3k

Up to 20kbits/sec

No load

±25V

-3.0V to -15V

±25V

+3.0V to +15V

Receiver Input

Voltage

0 Level

1 Level

Input Level, Max

___________________Chip Topography

TRANSISTOR COUNT: 694;

SUBSTRATE CONNECTED TO V+.

TC

0.178"

4.52mm

0.156"

3.96mm

RB

RC

DTE/DCE

TRB

RTB

HI-Z

C2+

C1+

SHDN

TB

RTA

TRA

RE

RDC

RA

TA

C2-

C1-

RDTC

RRE

GND

V-

V+

RTC

TRC