“Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.
Note 3:
Unless otherwise specified min/max limits apply across the −55˚C to +125˚C temperature range for the DS726LS31M and across the 0˚C to +70˚C range
for the DS26LS31. All typicals are given for V
CC
= 5V and T
A
= 25˚C.
Note 4:
All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified.
Note 5:
Only one output at a time should be shorted.
www.national.com
2
DS26LS31C/DS26LS31M
AC Test Circuit and Switching Time Waveforms
00577803
S1 and S2 of load circuit are closed except where shown.
FIGURE 1. AC Test Circuit
00577804
f = 1 MHz, t
r
≤
15 ns, t
f
≤
6 ns
FIGURE 2. Propagation Delays
00577805
f = 1 MHz, t
r
≤
15 ns, t
f
≤
6 ns
FIGURE 3. Enable and Disable Times
3
www.national.com
DS26LS31C/DS26LS31M
Typical Applications
Two-Wire Balanced System, RS-422
00577806
Note 6:
R
T
is optional although highly recommended to reduce reflection.
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