參數(shù)資料
型號(hào)： 5962-9855501VPA
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 模擬波形發(fā)生器
英文描述： TIMER, CDIP8
封裝： GREEN, CERAMIC, DIP-8
文件頁(yè)數(shù)： 18/18頁(yè)
文件大小： 350K
代理商： 5962-9855501VPA
Output
Pulse
Duration
s
C Capacitance
F
10
1
101
102
103
104
100
10
1
0.1
0.01
105
0.001
t w
RA = 10 M
RA = 10 k
RA = 1 k
RA = 100 k
RA = 1 M
V
oltage
2
V/div
Time 0.1 ms/div
Capacitor Voltage
Output Voltage
Input Voltage
RA = 9.1 k
CL = 0.01 F
RL = 1 k
See Figure 9
GND
OUT
VCC
CONT
RESET
DISCH
THRES
TRIG
C
RB
RA
Output
RL
0.01
F
m
VCC
(5 V to 15 V)
(see Note A)
Open
5
8
4
7
6
2
3
1
NOTE A: Decoupling CONT voltage to ground with a capacitor
can improve operation. This should be evaluated for
individual applications.
V
oltage
1
V/div
Time 0.5 ms/div
t
H
Capacitor Voltage
Output Voltage
tL
RA = 5 kW
RL = 1 kW
RB = 3 kW
See Figure 12
C = 0.15
F
www.ti.com
SGLS401 – FEBRUARY 2010
Figure 11. Typical Monostable Waveforms
Figure 12. Output Pulse Duration vs Capacitance
Astable Operation
As shown in Figure 13, adding a second resistor, RB, to the circuit of Figure 10 and connecting the trigger input
to the threshold input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through
RA and RB and then discharges through RB only. Therefore, the duty cycle is controlled by the values of RA and
RB.
This astable connection results in capacitor C charging and discharging between the threshold-voltage level
(
Ⅹ0.67 × VCC) and the trigger-voltage level (Ⅹ0.33 × VCC). As in the monostable circuit, charge and discharge
times (and, therefore, the frequency and duty cycle) are independent of the supply voltage.
Figure 13. Circuit for Astable Operation
Figure 14. Typical Astable Waveforms
Copyright 2010, Texas Instruments Incorporated
9
Product Folder Link(s): SE555-SP
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