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參數(shù)資料
| 型號： | MC14538 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | UltraLow-Supply Current/Supply-Voltage Supervisory Circuit 6-SOT-23 -40 to 85 |
| 中文描述： | 雙精密Retiggerable /復(fù)式單穩(wěn)態(tài)觸發(fā)器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 272K |
| 代理商： | MC14538 |
MOTOROLA CMOS LOGIC DATA
7
MC14538B
RETRIGGER OPERATION
The MC14538B is retriggered if a valid trigger occurs
fol-
lowed by another valid trigger
before the Q output has
returned to the quiescent (zero) state. Any retrigger, after the
timing node voltage at pin 2 or 14 has begun to rise from
Vref 1, but has not yet reached Vref 2, will cause an increase
in output pulse width T. When a valid retrigger is initiated
,
the voltage at CX/RX will again drop to Vref 1 before
progressing along the RC charging curve toward VDD. The Q
output will remain high until time T, after the last valid retrig-
ger.
RESET OPERATION
The MC14538B may be reset during the generation of the
output pulse. In the reset mode of operation, an input pulse
on Reset sets the reset latch and causes the capacitor to be
fast charged to VDD by turning on transistor P1
. When the
voltage on the capacitor reaches Vref 2, the reset latch will
clear, and will then be ready to accept another pulse. It the
Reset input is held low, any trigger inputs that occur will be
inhibited and the Q and Q outputs of the output latch will not
change. Since the Q output is reset when an input low level is
detected on the Reset input, the output pulse T can be made
significantly shorter than the minimum pulse width specifi-
cation.
POWER–DOWN CONSIDERATIONS
Large capacitance values can cause problems due to the
large amount of energy stored. When a system containing
the MC14538B is powered down, the capacitor voltage may
discharge from VDD through the standard protection diodes
at pin 2 or 14. Current through the protection diodes should
be limited to 10 mA and therefore the discharge time of the
VDD supply must not be faster than (VDD). (C)/(10 mA). For
example, if VDD = 10 V and CX = 10
μ
F, the VDD supply
should discharge no faster than (10 V) x (10
μ
F)/(10 mA) =
10 ms. This is normally not a problem since power supplies
are heavily filtered and cannot discharge at this rate.
When a more rapid decrease of VDD to zero volts occurs,
the MC14538B can sustain damage. To avoid this possibility
use an external clamping diode, DX, connected as shown in
Fig. 11.
Figure 11. Use of a Diode to Limit
Power Down Current Surge
PIN ASSIGNMENT
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
AB
RESET B
CX/RXB
VSS
VDD
QB
QB
BB
AA
BA
RESET A
CX/RXA
VSS
VSS
QA
QA
VSS
Dx
VDD
VDD
Rx
Cx
Q
Q
RESET
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC14538B | UltraLow-Supply Current/Supply-Voltage Supervisory Circuit 6-SOT-23 -40 to 85 |
| MC14538BCP | UltraLow-Supply Current/Supply-Voltage Supervisory Circuit 6-SOT-23 -40 to 85 |
| MC14538BD | UltraLow-Supply Current/Supply-Voltage Supervisory Circuit 6-SOT-23 -40 to 85 |
| MC14538BDR2 | UltraLow-Supply Current/Supply-Voltage Supervisory Circuit 6-SOT-23 -40 to 85 |
| MC14538BDT | UltraLow-Supply Current/Supply-Voltage Supervisory Circuit 6-SOT-23 -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC14538B | 制造商: 功能描述: 制造商:undefined 功能描述: |
| MC14538BBEBS | 制造商: 功能描述: 制造商:undefined 功能描述: |
| MC14538BCP | 功能描述:單穩(wěn)態(tài)多諧振蕩器 3-18V Dual Precision RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MC14538BCPG | 功能描述:單穩(wěn)態(tài)多諧振蕩器 3-18V Dual Precision MonoStable RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MC14538BD | 功能描述:單穩(wěn)態(tài)多諧振蕩器 3-18V Dual Precision RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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