參數(shù)資料
型號(hào)： N555
廠(chǎng)商： Texas Instruments, Inc.
英文描述： PRECISION TIMERS
中文描述： 精密定時(shí)器
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 356K
代理商： N555
www.ti.com
Sequential Timer
Many applications, such as computers, require signals for initializing conditions during start-up. Other
applications, such as test equipment, require activation of test signals in sequence. These timing circuits can be
connected to provide such sequential control. The timers can be used in various combinations of astable or
monostable circuit connections, with or without modulation, for extremely flexible waveform control.
Figure 22
shows a sequencer circuit with possible applications in many systems, and
Figure 23
shows the output
waveforms.
S
V
CC
RESET
V
CC
OUT
DISCH
GND
CONT
TRIG
4
8
3
7
6
1
5
2
THRES
R
C
C
C
0.01
μ
F
C
C
= 14.7
μ
F
R
C
= 100 k
Output C
RESET
V
CC
OUT
DISCH
GND
CONT
TRIG
4
8
3
7
6
1
5
2
THRES
R
B
33 k
0.001
μ
F
0.01
μ
F
C
B
= 4.7
μ
F
R
B
= 100 k
Output B
Output A
R
A
= 100 k
C
A
= 10
μ
F
μ
F
0.01
μ
F
0.001
33 k
RA
THRES
2
5
1
6
7
3
8
4
RESET
TRIG
CONT
GND
DISCH
OUT
V
CC
C
B
C
A
Pin numbers shown are for the D, JG, P, PS, and PW packages.
NOTE A: S closes momentarily at t = 0.
V
Figure 23. Sequential Timer Waveforms
See Figure 22
Output A
Output B
Output C
t = 0
t
w
C = 1.1 R
C
C
C
t
w
C
t
w
B = 1.1 R
B
C
B
t
w
A = 1.1 R
A
C
A
t
w
A
NA555, NE555, SA555, SE555
PRECISION TIMERS
SLFS022F–SEPTEMBER 1973–REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Figure 22. Sequential Timer Circuit
15
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