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low level or vice versa.
In Standard EIA-422-A, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.
Only one output at a time should be shorted, and duration of the short circuit should not exceed one second.
switching characteristics, VCC = 5 V, TA = 25C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
td(OD) Differential output delay time 10 20 ns
CL =15pF RL = 100 &! See Figure 2
CL = 15 pF, RL = 100 &!, See Figure 2
tt(OD) Differential output transition time 10 20 ns
tsk(o) Output skew See Figure 2 1 ns
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POST OFFICE BOX 655303 " DALLAS, TEXAS 75265
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C OCTOBER 1980 REVISED APRIL 1994
PARAMETER MEASUREMENT INFORMATION
50 &!
VOD2
Input
VOC
50 &!
Figure 1. Differential and Common-Mode Output Voltages
3 V
Input
1.5 V 1.5 V
0 V
td(OD) td(OD)
Y Output
Differential
90%
90%
CL
Output
10%
10%
RL = 100 &!
Generator
tt(OD) tt(OD)
(see Note A)
50 &!
Z Output
VOH
CL = 15 pF Y Output
50% 50%
(see Note B)
VOL
tsk(o) tsk(o)
VOH
50% 50%
Z Output
VOL
TEST CIRCUIT VOLTAGE WAVEFORMS
NOTES: A. The input pulse generator has the following characteristics: ZO = 50 &!, PRR d" 500 kHz, tw = 100 ns, tr = d" 5 ns.
B. CL includes probe and jig capacitance.
Figure 2. Test Circuit and Voltage Waveforms
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