Datasheet

  
  
SLLS106G − DECEMBER 1975 − REVISED NOVEMBER 2004
9
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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of CCITT V.35 and is summarized in Table 1 (V.35 has been replaced by ITU V.11).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, Z
source
50 150
Resistance to ground, R 135 165
Differential output voltage, V
OD
440 660 mV
10% to 90% rise time, t
r
40 ns
or 0.01 × ui
Common-mode output voltage, V
OC
−0.6 0.6 V
LOAD (RECEIVER) MIN MAX UNIT
Input impedance, Z
I
90 110
Resistance to ground, R 135 165
ui = unit interval or minimum signal-element pulse duration
Data Ou
t
1Y
Data In
1B
Enable
1C
1A
R3
390
R1
1.3 k
R5
75
R4
390
R2
1.3 k
R6
50
R7
50
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
1A
1B
1/2 SN75107A
Enable
1G
4
5
6
Strobe
Figure 5. CCITT-Recommended V.35 Interface Using the SN75112 and SN75107A