MAX3171 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – +3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers

19-1703; Rev 1; 8/01
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
General Description
The MAX3171/MAX3173 are three-driver/three-receiver
multiprotocol transceivers that operate from a single
+3.3V supply. The MAX3171/MAX3173, along with the
MAX3170 and MAX3172/MAX3174, form a complete
software-selectable data terminal equipment (DTE) or
data communications equipment (DCE) interface port
that supports V.28 (RS-232) and V.10/V.11 (RS-449,
V.36, EIA-530, EIA-530-A, X.21, RS-423) protocols. The
MAX3171/MAX3173 transceivers carry the serial inter-
face control signaling; the MAX3170 transceivers carry
the clock and data signals. The MAX3172/
MAX3174 have an extra transceiver for applications
requiring four transceivers for control signaling.
An internal charge pump and proprietary low-dropout
transmitter output stage allow V.28, V.11, and V.10
compliant operation from a single +3.3V supply. A no-
cable mode is entered when all mode pins (M0, M1,
and M2) are pulled high or left unconnected. In no-
cable mode, supply current decreases to 2mA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit limiting and thermal-shut-
down circuits protect the drivers against excessive
power dissipation.
The MAX3171 features 10µs deglitching on the
V.10/V.11/V.28 receiver inputs. The MAX3173 is avail-
able for applications that do not require deglitching on
the serial handshake signals.
These parts require only four surface-mount capacitors
for charge-pump operation in addition to supply
bypassing.
CTS DSR
DCD DTR RTS
LL
Features
o Industry’s First +3.3V Multiprotocol Transceiver
o Certified TBR-1 and TBR-2 Compliant
(NET1 and NET2)
o Supports V.28 (RS-232) and V.10/V.11 (RS-449,
V.36, EIA-530, EIA-530-A, X.21, RS-423) Protocols
o 3V/5V Logic Compatibility
o Software-Selectable DCE/DTE
o True Fail-Safe Receiver Operation
o Available in Small 28-Pin SSOP Package
o 10µs Receiver Input Deglitching (MAX3171 only)
o All Transmitter Outputs Fault Protected to ±15V,
Tolerate Cable Miswiring
________________________Applications
Data Networking PCI Cards
CSU and DSU
Telecommunications
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX3171CAI
0°C to +70°C
28 SSOP
MAX3173CAI
0°C to +70°C
28 SSOP
PinDCaotanfRigouurtaetirosn 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 pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.