SN55110A, SN75110A, SN75112

DUAL LINE DRIVERS

SLLS106G − DECEMBER 1975 − REVISED NOVEMBER 2004

9

POST OFFICE BOX 655303

APPLICATION INFORMATION

using the SN75112 as a CCITT-recommended V.35 line driver

The SN75112 dual line driver, the SN75107A dual line receiver, and some external resistors can be used to

implement the data-interchange circuit of CCITT recommendation V.35 (1976) modem specification. The circuit

of one channel is shown in Figure 5 and meets the requirement of the interface as specified by Appendix 11

of CCITT V.35 and is summarized in Table 1 (V.35 has been replaced by ITU V.11).

Table 1. CCITT V.35 Electrical Requirements

GENERATOR

MIN

MAX

UNIT

Source impedance, Zsource

50

150

Ω

Resistance to ground, R

135

165

Ω

Differential output voltage, VOD

440

660

mV

10% to 90% rise time, tr

40

ns

or

0.01

× ui†

Common-mode output voltage, VOC

−0.6

0.6

V

LOAD (RECEIVER)

MIN

MAX

UNIT

Input impedance, ZI

90

110

Ω

Resistance to ground, R

135

165

Ω

† ui = unit interval or minimum signal-element pulse duration

Data Out

1Y

Data In

1B

Enable

1C

1A

R3

390

Ω

R1

1.3 k

Ω

R5

75

Ω

R4

390

Ω

R2

1.3 k

Ω

R6

50

Ω

R7

50

Ω

R8

100 pF

All resistors are 5%, 1/4 W.

5 V

5 V

5 V

5 V

13

12

1/2 SN75112

1

2

10

3

100 pF

1Y

1Z

1

2

125

Ω

1A

1B

1/2 SN75107A

Enable

1G

4

5

6

Strobe

Figure 5. CCITT-Recommended V.35 Interface Using the SN75112 and SN75107A