MAX3172 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers

19-1801; Rev 1; 1/01
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
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
CTS DSR
DCD DTR RTS
LL
Features
o Industry’s First +3.3V Multiprotocol Termination
Networks and Transceivers
o Certified TBR-1 and TBR-2 Compliant
(NET1 and NET2)
o 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
o 3V/5V Logic-Compatible I/O
o Software-Selectable DTE/DCE
o Replace Discrete Resistor Termination Networks
and Expensive Relays
o 10µs Receiver Input Deglitching (MAX3172 only)
o Available in Small 28-Pin SSOP Package
o Transmitter Output Fault Protected to ±15V,
Tolerates Cable Miswiring
PART
MAX3172CAI
MAX3174CAI
Ordering Information
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SSOP
28 SSOP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
RXD RXC
TXC SCTE TXD
MAX3171 _{R3 R2 R1}
MAX3173
D3 D2 D1
MAX3172
MAX3174
R3 R2 R1
D3 D2 D1
MAX3170
R4
D4
13 5 10 8
22 6 23 20 19 4
1
7
DB-25 CONNECTOR
18 16 3 9 17
12 15 11 24 14 2
________________________________________________________________ Maxim Integrated Products 1
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.