The state of the MXL1344A’s mode-select pins, M0,

M1, M2, and DCE/DTE determines the mode of each of

erence of termination mode and select pin state for

each of the six termination networks within the

MXL1344A.

+5V Multiprotocol, Software-Selectable

Cable Terminator

6

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Table 1. Termination Mode Select Table

PROTOCOL

DCE/ DTE

M2

M1

M0

R1

R2

R3

R4

R5

R6

V.10/RS-423

0

0

0

0

Z

Z

Z

Z

Z

Z

RS-530A

0

0

0

1

Z

Z

Z

V.11

V.11

V.11

RS-530

0

0

1

0

Z

Z

Z

V.11

V.11

V.11

X.21

0

0

1

1

Z

Z

Z

V.11

V.11

V.11

V.35

0

1

0

0

V.35

V.35

Z

V.35

V.35

V.35

RS-449/V.36

0

1

0

1

Z

Z

Z

V.11

V.11

V.11

V.28/RS-232

0

1

1

0

Z

Z

Z

Z

Z

Z

No Cable

0

1

1

1

V.11

V.11

V.11

V.11

V.11

V.11

V.10/RS-423

1

0

0

0

Z

Z

Z

Z

Z

Z

RS-530A

1

0

0

1

Z

Z

Z

Z

V.11

V.11

RS-530

1

0

1

0

Z

Z

Z

Z

V.11

V.11

X.21

1

0

1

1

Z

Z

Z

Z

V.11

V.11

V.35

1

1

0

0

V.35

V.35

V.35

Z

V.35

V.35

RS-449/V.36

1

1

0

1

Z

Z

Z

Z

V.11

V.11

V.28/RS-232

1

1

1

0

Z

Z

Z

Z

Z

Z

No Cable

1

1

1

1

V.11

V.11

V.11

V.11

V.11

V.11

Note: Z Indicates high impedance, 1 = high and 0 = low. Z, V.11, and V.35 refer to termination modes (Figure 4.)

R2

52

Ω

R3

127

Ω

R1

52

Ω

S1

CLOSED

A

B

S2

OPEN

(a) V.11

(b) V.35

(c) Z

A

C

B

A

B

MXL1344A

R2

52

Ω

R3

127

Ω

R1

52

Ω

S1

CLOSED

S2

CLOSED

R2

52

Ω

R3

127

Ω

R1

52

Ω

S1

OPEN

S2

OPEN

CC

MXL1344A

MXL1344A

Figure 4. Termination Modes