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參數(shù)資料
| 型號(hào)： | 935189800118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 諧振器 |
| 英文描述： | HCT SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封裝： | SOT-338-1, SSOP-16 |
| 文件頁(yè)數(shù)： | 8/19頁(yè) |
| 文件大?。?/td> | 332K |
| 代理商： | 935189800118 |
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Philips Semiconductors - PIP - 74HC/HCT221; Dual non-retriggerable monostable multivibrator with reset
Product Information
74HC/HCT221; Dual
non-retriggerable
monostable
multivibrator with
reset
Information as of 2003-04-22
Stay informed
Download datasheet
Block diagram
topGeneral description
The 74HC/HCT221 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC standard no. 7A.
The 74HC/HCT221 are dual non-retriggerable monostable multivibrators. Each multivibrator features an active
LOW-going edge input (nA) and an active HIGH-going edge input (nB), either of which can be used as an enable
input.
Pulse triggering occurs at a particular Voltage level and is not directly related to the transition time of the input
pulse. Schmitt-trigger input circuitry for the nB inputs allow jitter-free triggering from inputs with slow transition
rates, providing the circuit with excellent noise immunity.
Once triggered, the outputs (nQ, nQ) are independent of further transitions of nA and nB inputs and are a function
of the timing components. The output pulses can be terminated by the overriding active LOW reset inputs (nRD ).
Input pulses may be of any duration relative to the output pulse.
Pulse width stability is achieved through internal compensation and is virtually independent of Vcc and
temperature. In most applications pulse stability will only be limited by the accuracy of the external timing
components.
The output pulse width is defined by the following relationship:
tW =CEXT REXT In2
tW = 0.7CEXT REXT
Pin assignments for the '221'are identical to those of the '123' so that the '221' can be substituted for those products
in systems not using the retrigger by merely changing the value of REXT and/or CEXT .
file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74HC221N.html (1 of 4) [Apr-29-2003 12:42:10 PM]
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