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参数资料
| 型号： | 74VHC221AMX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | MULTIVIBRATOR DUAL MONO 16SOIC |
| 标准包装： | 2,500 |
| 系列： | 74VHC |
| 逻辑类型： | 单稳态 |
| 独立电路： | 2 |
| 施密特触发器输入： | 无 |
| 传输延迟： | 8.1ns |
| 输出电流高，低： | 8mA，8mA |
| 电源电压： | 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
74VHC221A
Dual
Non-Retrig
g
erab
le
Monostab
le
Multivibrator
1994 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74VHC221A Rev. 1.2
2
Connection Diagram
Logic Symbol
IEEE/IEC
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
= HIGH-to-LOW Transition
= 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 possibil-
ity 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 para-
sitic diode is ±20 mA. In the case of a large Cx, the limit
of fall time of the supply voltage is determined as follows:
tf ≥ (VCC – 0.7) Cx / 20mA
(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 condi-
tion, an external clamping diode (Dx) is needed to
protect the IC from rush current.
Inputs
Outputs
Function
A
B
CLR
QQ
HH
Output Enable
X
LHL
H
Inhibit
HX
HL
H
Inhibit
LH
Output Enable
LH
Output Enable
XX
LL
H
Reset
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 74VHC221AN | 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 |
| 74VHC221AN_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 |
| 74VHC221ASJ | 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 |
| 74VHC221ASJ_07 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual Non-Retriggerable Monostable Multivibrator |
| 74VHC221ASJ_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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