ls7211 LSI Computer Systems, Inc., ls7211 Datasheet - Page 5

• Manufacturer Part Number: ls7211
• Description: Programmable Digital Delay Timer
• Manufacturer: LSI Computer Systems, Inc.

7211-012703-5
Note 1. TRIG input is clocked in by the negative edge of external clock.
Note 2. Inputs A, B and WB0 - WB7 are sampled only at a TRIG input trainsition and ignored at all other times.
Note 3. OUT is switched by the positive edge of the external clock.
A. Turn-on delay in DO and DD modes; Pulse-width in OS mode.
B. Turn-off delay in DR and DD modes.
C. Pulse-width extended by re-trigger in OS mode.
D. Turn-off delay in DR mode.
E. Turn-on delay in DO and DD modes; pulse-width in OS mode.
F. No effect in DO, DR and DD modes because of TRIG’s switching back to opposite levels.
G. Time-outs aborted and OUT forces high by RESET.
H. After the removal of RESET, OUT switches to the inverse polarity of TRIG
TRIG
Clock
WB0-WB7
A,B
OUT
No effect in DO and DD modes because TRIG switches back low before turn-on delay has timed out.
immediately (DR) or after the timeout (DO, DD). No effect in OS.
OUT(DR)
OUT(OS)
R E S E T
OUT(DO)
OUT(DD)
TRIG
t
0
t
3
t
2
FIGURE 4. MODE ILLUSTRATION WITH TRIG, OUT AND RESET
A = 0, B = 1, Delayed Operate
t
A
1
B
Programmed Delay
FIGURE 3. INPUT/OUTPUT TIMING
C
D
E
F
t
4
t
1
G
Immediate Release
H
t
4