mxl1344a Maxim Integrated Products, Inc., mxl1344a Datasheet - Page 4

• Manufacturer Part Number: mxl1344a
• Description: Mxl1344a +5v Multiprotocol, Software-selectable Cable Terminator
• Manufacturer: Maxim Integrated Products, Inc.

The MXL1344A contains six software-selectable multi-
protocol cable termination networks
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 termination protocol can be selected by the serial
interface cable wiring or by software control. The
MXL1344A replaces discrete resistor termination net-
+5V Multiprotocol, Software-Selectable
Cable Terminator
*V
as follows:
4
EE
12, 13
PIN
_______________________________________________________________________________________
10
11
14
15
16
17
18
19
20
21
22
23
24
is typically supplied by the charge pump of the MXL1543. The V
1
2
3
4
5
6
7
8
9
DCE/ DTE
LATCH
NAME
GND
R1C
R2C
R3C
R1B
R1A
R2A
R2B
R3A
R3B
V
R4B
R4A
R5B
R5A
R6A
R6B
V
M0
M2
M1
CC
EE
Detailed Description
V.35/V.28 Modes: -6.50V ≤ V
V.10/V.11 Modes: -4.60V ≤ V
Mode-Select Pin (Table 1)
Negative Supply Voltage (typically connected to V
capacitor.
Load 1, Center Tap
Load 1, Node B
Load 1, Node A
Load 2, Node A
Load 2, Node B
Load 2, Center Tap
Load 3, Node A
Load 3, Node B
Load 3, Center Tap
Ground
+5V Supply Voltage. Bypass to GND with a 0.1µF capacitor.
Load 4, Node B
Load 4, Node A
Load 5, Node B
Load 5, Node A
Load 6, Node A
Load 6, Node B
Latch Signal Input. When LATCH is LOW, the input latches are transparent. When LATCH is high, the
data at the mode-select inputs are latched.
Logic Level HIGH selects DCE interface, (Table 1)
Mode-Select Pin (Table 1)
Mode-Select Pin (Table 1)
(Figure 3). Each
EE
EE
≤ -5.45V, in typical operation V
≤ -3.80V, in typical operation V
EE
works 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
DTE/DCE interface port when used with the MXL1543
and MXL1544/MAX3175 transceivers. The MXL1344A
terminator can use the V
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
input level varies with the mode of chipset operation
FUNCTION
EE
of MXL1543*). Bypass to GND with a 0.1µF
EE
EE
= -5.80V
= -4.20V
EE
power generated by the
Pin Description