LM111, LM211, LM311, LM311Y
DIFFERENTIAL COMPARATORS WITH STROBES
SLCS007A – SEPTEMBER 1973 – REVISED FEBRUARY 1992
APPLICATION INFORMATION
Figure 11 through Figure 29 show various applications for the LM111, LM211, and LM311 comparators.
V
CC+
V
CC+
20 kΩ
1 kΩ
3 kΩ
3 kΩ
Square Wave
Output
10 kΩ
(fanout to two
Series 54 gates
or equivalent)
BAL/
STRB
1200 pF
BALANCE
20 kΩ
39 kΩ
Figure 11. 100-kHz Free-Running Multivibrator
Figure 12. Offset Balancing
V
CC+
20 kΩ
Output
BAL/STRB
Input
TTL Strobe
2N2222
1 kΩ
V
CC–
Figure 13. Strobing
Figure 14. Zero-Crossing Detector
5 V
1 kΩ
82 kΩ
240 kΩ
†
Output to TTL
Input
47 kΩ
‡
82 kΩ
†
‡
Resistor values shown are for a 0-to-30-V logic swing and a 15-Vthreshold.
May be added to control speed and reduce susceptibility to noise spikes.
Figure 15. TTL Interface With High-Level Logic
11
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