MXL1344A Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +5V Multiprotocol, Software-Selectable Cable Terminator

19-1775; Rev 0; 2/01
+5V Multiprotocol, Software-Selectable
Cable Terminator
General Description
The MXL1344A contains six software-selectable, multi-
protocol 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 differential 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 trans-
ceivers having on-chip termination. The termination pro-
tocol can be selected by the serial interface cable
wiring or by software control. The MXL1344A replaces
discrete resistor termination networks and expensive
relays required for multiprotocol termination, saving
space and cost.
The MXL1344A terminator is designed to form a com-
plete +5V cable- or software-selectable multiprotocol
DCE/DTE interface port when used with the MXL1543
and MXL1544/MAX3175 transceiver ICs. The MXL1344A
terminator can use the V_EE power generated by the
MXL1543 charge pump, simplifying system design. The
MXL1344A, MXL1543, and MXL1544/MAX3175 are pin-
for-pin compatible with the LTC1344A, LTC1543, and
LTC1544, but for proper operation the entire Maxim
chipset must be used without substituting other manu-
facturer's parts on a chip-by-chip basis.
The MXL1344A is available in a 24-pin SSOP package
and is specified for the 0°C to +70°C commercial tem-
perature range.
Features
o Certified TBR-1 and TBR-2-Compliant Chipset
(NET1 and NET2)—Pending Completion of
Testing
o Supports V.10 (RS-423), V.11 (RS-422, RS-530,
RS-530A, RS-449, V.36, and X.21), V.28 (RS-232)
and V.35 Termination
o Cable- or Software-Selectable Termination
o Cable- or Software-Selectable DTE/DCE
o Replaces Discrete Resistor Termination Networks
and Expensive Relays
o Available in Small 24-Pin SSOP Package
Data Networking
CSU and DSU
Data Routers
Applications
PCI Cards
Telecommunication Equipment
Data Switches
Ordering Information
PART
MXL1344ACAG
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
24 SSOP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
LL CTS DSR
DCD DTR RTS
RXD RXC
TXC SCTE TXD
D4
R4
R3
R2
MXL1544/ _D3
R1 MAX3175
D2
D1
R3
R2
MXL1543 _D3
R1
D2
D1
MXL1344A
18 13 5 10 8
22 6 23 20 19 4
1 7 16 3 9 17
12 15 11 24 14 2
DB-25 CONNECTOR
________________________________________________________________ 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.