MXL1344ACAG 데이터 시트보기 (PDF) - Maxim Integrated

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MXL1344ACAG

+5V Multiprotocol, Software-Selectable Cable Terminator

Maxim Integrated 

+5V Multiprotocol, Software-Selectable

Cable Terminator

No-Cable Mode

The MXL1344A enters no-cable mode when the mode

select inputs, M0, M1, and M2 are connected HIGH or

left unconnected. In no-cable mode, all six termination

networks are placed in V.11 mode, with S1 closed and

S2 open (Figure 4).

Applications Information

Older multiprotocol interface termination circuits have

been constructed using expensive relays with discrete

resistors, custom cables with built-in termination, or

complex circuit-board configurations to route signals to

GENERATOR

BALANCED

INTERCONNECTING

CABLE

LOAD

CABLE

TERMINATION RECEIVER

A

A′

100Ω

MIN

B

B′

C

C′

Figure 6. Typical V.11 Interface

the correct termination. The MXL1344A provides a sim-

ple solution to this termination problem. All required ter-

mination configurations are easily cable- or software-

selectable using the four mode-control input pins M0,

M1, M2, and DCE/DTE.

Using the MXL1344A in a Multiprotocol

Serial Interface

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 differential driver/receivers.

The MXL1344A terminator is designed to use the VEE

power generated by the MXL1543’s charge pump and

will meet all data sheet specifications when connected

as illustrated in Figure 5. The mode-selection tables of

all three devices are identical, allowing the M0, M1, M2,

and DCE/DTE pins of each device to be connected to a

single 4-wire control bus. The MXL1543 and MXL1544/

MAX3175 provide internal pullups for the four lines,

forcing them to the logic high state if they are not

grounded. This allows interface-mode configuration by

simply strapping the appropriate pins to ground in the

interconnect cable.

In Figure 5, M1, M2 and DCE/DTE are shorted to the

cable ground, forcing logic LOW on these control lines.

Input M0 is left floating and will be pulled HIGH by

internal pullups on the MXL1543 and MXL1544/

A′

R1

MXL1344A

52Ω

S1

S2

R3

127Ω

A

R5

30kΩ

R8

5kΩ

R6

10kΩ

S3

MXL1543

RECEIVER

R2

52Ω

B′

R7

10kΩ

R4

B

30kΩ

C′

GND

Figure 7. V.11 Termination and Internal Resistance Networks

8 _______________________________________________________________________________________

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