MXL1344ACAG Просмотр технического описания (PDF) - Maxim Integrated

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MXL1344ACAG

+5V Multiprotocol, Software-Selectable Cable Terminator

Maxim Integrated 

+5V Multiprotocol, Software-Selectable

Cable Terminator

Pin Description

PIN

NAME

FUNCTION

1

2

3

4

5

6

7

8

9

10

11

12, 13

14

15

16

17

18

19

20

21

22

23

24

M0

VEE

R1C

R1B

R1A

R2A

R2B

R2C

R3A

R3B

R3C

GND

VCC

R4B

R4A

R5B

R5A

R6A

R6B

LATCH

DCE/ DTE

M2

M1

Mode-Select Pin (Table 1)

Negative Supply Voltage (typically connected to VEE of MXL1543*). Bypass to GND with a 0.1µF

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)

*VEE is typically supplied by the charge pump of the MXL1543. The VEE input level varies with the mode of chipset operation

as follows:

V.35/V.28 Modes: -6.50V ≤ VEE ≤ -5.45V, in typical operation VEE = -5.80V

V.10/V.11 Modes: -4.60V ≤ VEE ≤ -3.80V, in typical operation VEE = -4.20V

Detailed Description

The MXL1344A contains six software-selectable multi-

protocol cable termination networks (Figure 3). 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 termination protocol can be selected by the serial

interface cable wiring or by software control. The

MXL1344A replaces discrete resistor termination net-

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 VEE 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

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