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参数资料
| 型号： | 74VHC123A |
| 厂商： | Fairchild Semiconductor Corporation |
| 英文描述： | Automotive Catalog Dual D-Type Positive-Edge-Triggered Flip-Flops With Clear and Preset 14-SOIC -40 to 125 |
| 中文描述： | 双Retriggerable单稳态触发器 |
| 文件页数： | 2/9页 |
| 文件大小： | 107K |
| 代理商： | 74VHC123A |
www.fairchildsemi.com
2
7
4
VH
C12
3
A
Pin Descriptions
Truth Table
H
= HIGH Voltage Level
= HIGH-to-LOW Transition
L
= LOW Voltage Level
= LOW-to-HIGH Transition
X
= Don’t Care
Block Diagrams
Note A: Cx, Rx, Dx are external Capacitor, Resistor, and Diode, respectively.
Note B: External clamping diode, Dx;
External capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied.
If the supply voltage is turned off, Cx discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large and VCC drops rapidly, there will be
some possibility of damaging the IC through in rush current or latch-up. If the capacitance of the supply voltage filter is large enough and VCC drops slowly,
the in rush current is automatically limited and damage to the IC is avoided.
The maximum value of forward current through the parasitic diode is
±20 mA. In the case of a large Cx, the limit of fall time of the supply voltage is deter-
mined as follows:
tf ≥ (VCC 0.7) Cx/20 mA
(tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC)
In the event a system does not satisfy the above condition, an external clamping diode (Dx) is needed to protect the IC from rush current.
System Diagram
Pin Names
Description
A
Trigger Inputs (Negative Edge)
B
Trigger Inputs (Positive Edge)
CLR
Reset Inputs
Cx
External Capacitor
Rx
External Resistor
Q, Q
Outputs
Inputs
Outputs
Function
A
BCLR
QQ
HH
Output Enable
X
L
H
L
H
Inhibit
H
X
H
L
H
Inhibit
L
H
Output Enable
LH
Output Enable
XX
L
H
Reset
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 74VHC123A_07 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual Retriggerable Monostable Multivibrator |
| 74VHC123AFT | 功能描述:Monostable Multivibrator 9.6ns 16-TSSOP 制造商:toshiba semiconductor and storage 系列:汽车级，AEC-Q100，74VHC 包装:剪切带（CT） 零件状态:停产 逻辑类型:单稳态 独立电路:2 施密特触发器输入:无 传播延迟:9.6ns 电流 - 输出高，低:8mA，8mA 电压 - 电源:2 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:16-TSSOP 标准包装:1 |
| 74VHC123AM | 功能描述:单稳态多谐振荡器 Dual Multivibrator RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 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 |
| 74VHC123AM | 制造商:Fairchild Semiconductor Corporation 功能描述:74VHC CMOS SMD 74VHC123 SOIC16 |
| 74VHC123AM_Q | 功能描述:单稳态多谐振荡器 Dual Multivibrator RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 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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