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參數(shù)資料
| 型號： | 74VHC221ASJX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | MULTIVIBRATOR DUAL MONO 16SOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 系列： | 74VHC |
| 邏輯類型： | 單穩(wěn)態(tài) |
| 獨立電路： | 2 |
| 施密特觸發(fā)器輸入： | 無 |
| 傳輸延遲： | 8.1ns |
| 輸出電流高，低： | 8mA，8mA |
| 電源電壓： | 2 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOP |
| 包裝： | 帶卷 (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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