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参数资料
| 型号： | TS555MP |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | PULSE; RECTANGULAR, 2 MHz, TIMER, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 11/12页 |
| 文件大小： | 218K |
| 代理商： | TS555MP |
TS555
8/12
TYPICAL CHARACTERISTICS
Figure 1 : Supply Current (each timer) versus
Supply Voltage
APPLICATION INFORMATION
MONOSTABLE OPERATION
In the monostable mode,the timer operates like a
one-shot generator. Referring to figure 2, the ex-
ternal capacitor is initially held discharged by a
transistor inside the timer.
Figure 2 :
The circuit triggers on a negative-going input sig-
nal when the level reaches 1/3 VCC. Once trig-
gered, the circuit remains in this state until the set
time has elapsed, even if it is triggered again dur-
ing this interval. The duration of the output HIGH
state is given by t = 1.1 R x C.
It can be noticed that since the charge rate and the
threshold level of the comparator are both directly
proportional to the supply voltage, the timing inter-
val is independent of the supply. Applying a nega-
tive pulse simultaneously to the Reset terminal
(pin 4) and the Trigger terminal (pin 2) during the
timing cycle discharges the external capacitor and
causes the cycle to start over. The timing cycle
now starts on the positive edge of the reset pulse.
While the reset pulse is applied, the output is driv-
en to the LOW state.
When a negative trigger pulse is applied to pin 2,
the flip-flop is set, releasing the short circuit across
the external capacitor and driving the output
HIGH. The voltage across the capacitor increases
exponentially with the time constant
τ = R x C.
When the voltage across the capacitor equals 2/3
VCC, the comparator resets the flip-flop which then
discharges the capacitor rapidly and drives the
output to its LOW state.
Figure 3 shows the actual waveforms generated in
this mode of operation.
When Reset is not used, it should be tied high to
avoid any possible or false triggering.
Figure 3 :
CC
SUPPLY VOLTAGE, V
(V)
CC
SU
PPL
Y
C
U
R
E
N
T
,
I
(
A)
300
200
100
0
4
8
12
16
VCC
Reset
Trigger
Out
3
2
4
8
7
6
5
1
TS555
R
C
Control Voltage
0.01 F
CAPACITOR VOLTAGE = 2.0V/div
t = 0.1 ms / div
INPUT = 2.0V/div
OUTPUT VOLTAGE = 5.0V/div
R = 9.1k , C = 0.01 F , R = 1.0k
L
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS555MPT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Low power single CMOS timer |
| TS556 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER DUAL CMOS TIMER |
| TS556_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Low-power dual CMOS timer |
| TS556C | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER DUAL CMOS TIMER |
| TS556CD | 功能描述:计时器和支持产品 Low Power Dual RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
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