General Description

The MAX3172/MAX3174 contain five software-selec-

table multiprotocol cable termination networks. Each

network is capable of terminating V.11 (RS-422, RS-

530, RS-530A, RS-449, V.36, and X.21) with a 100Ω dif-

ferential load, V.35 with a T-network load, or V.28

(RS-232) and V.10 (RS-423) with an open circuit load

for use with transceivers having on-chip termination.

The devices replace discrete resistor termination net-

works and expensive relays required for multiprotocol

termination. The MAX3172/MAX3174, along with the

MAX3170 and MAX3171/MAX3173, form a complete

+3.3V software-selectable DTE or DCE interface port

supporting V.11/RS-422, RS-530, RS-530A, V.36/RS-

449, V.35, V.28/RS-232, V.10/RS-423, and X.21 serial

interfaces.

In addition to the five multiprotocol cable termination

networks, the MAX3172/MAX3174 contain a 1Tx/1Rx

multiprotocol transceiver designed to use V+ and V-

generated by the MAX3171/MAX3173 charge pump.

The MAX3172/MAX3174 transceiver is software selec-

table between V.10 and V.28 modes of operation. The

MAX3172 features 10µs deglitching on the V.10/V.28

receiver input to facilitate unterminated operation, while

the MAX3174 is used in applications that do not require

deglitching on the serial handshake signals. These

devices are available in a 28-pin SSOP package.

________________________Applications

Data Networking

PCI Cards

CSU and DSU

Telecommunications

Data Routers

Features

♦ Industry’s First +3.3V Multiprotocol Termination

Networks and Transceivers

♦ Certified TBR-1 and TBR-2 Compliant

(NET1 and NET2)

♦ Support V.28 (RS-232), V.11 (RS-422, RS-530, RS-

530A, RS-449, V.36, and X.21), V.10 and V.35

♦ 3V/5V Logic-Compatible I/O

♦ Software-Selectable DTE/DCE

♦ Replace Discrete Resistor Termination Networks

and Expensive Relays

♦ 10µs Receiver Input Deglitching (MAX3172 only)

♦ Available in Small 28-Pin SSOP Package

♦ Transmitter Output Fault Protected to ±15V,

Tolerates Cable Miswiring

+3.3V Multiprotocol Software-Selectable

Cable Terminators and Transceivers

________________________________________________________________ Maxim Integrated Products

1

19-1801; Rev 2; 6/04

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX3172CAI

0

°C to +70°C

28 SSOP

MAX3172EAI

-40

°C to +85°C

28 SSOP

MAX3174CAI

0

°C to +70°C

28 SSOP

D1

D2

D3

R1

R2

R3

MAX3170

RXD

RXC

TXD

TXC

SCTE

D1

R4

D4

D2

D3

R1

R2

R3

MAX3171

MAX3173

MAX3172

MAX3174

CTS

DSR

RTS

DTR

LL

DCD

DB-25 CONNECTOR

13 5

10 8

22 6

23 20 19 4

1

7

16

18

3

9 17

12 15 11 24 14 2

Typical Operating Circuit

Pin Configuration appears at end of data sheet.

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.