74221 Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

74221

Dual Monostable Multivibrators (with Schmitt Trigger Input)

Fairchild Semiconductor 

September 1983

Revised February 1999

MM74HC221A

Dual Non-Retriggerable Monostable Multivibrator

General Description

The MM74HC221A high speed monostable multivibrators

(one shots) utilize advanced silicon-gate CMOS technol-

ogy. They feature speeds comparable to low power Schot-

tky TTL circuitry while retaining the low power and high

noise immunity characteristic of CMOS circuits.

Each multivibrator features both a negative, A, and a posi-

tive, B, transition triggered input, either of which can be

used as an inhibit input. Also included is a clear input that

when taken low resets the one shot. The MM74HC221A

can be triggered on the positive transition of the clear while

A is held LOW and B is held HIGH.

The MM74HC221A is a non-retriggerable, and therefore

cannot be retriggered until the output pulse times out.

Pulse width stability over a wide range of temperature and

supply is achieved using linear CMOS techniques. The out-

put pulse equation is simply: PW = (REXT) (CEXT); where

PW

is in seconds, R is in ohms, and C is in farads. All inputs

are protected from damage due to static discharge by

diodes to VCC and ground.

Features

s Typical propagation delay: 40 ns

s Wide power supply range: 2V–6V

s Low quiescent current: 80 µA maximum (74HC Series)

s Low input current: 1 µA maximum

s Fanout of 10 LS-TTL loads

s Simple pulse width formula T = RC

s Wide pulse range: 400 ns to ∞ (typ)

s Part to part variation: ±5% (typ)

s Schmitt Trigger A & B inputs enable infinite signal input

rise or fall times

Ordering Code:

Order Number Package Number

Package Description

MM74HC221AM

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow

MM74HC221ASJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

MM74HC221AMTC

MTC16

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

MM74HC221AN

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), MS-001, 0.300” Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagrams

Pin Assignments for DIP, SOIC, SOP and TSSOP

Timing Component

Top View

Note: Pin 6 and Pin 14 must be hard-wired to GND.

© 1999 Fairchild Semiconductor Corporation DS005325.prf

www.fairchildsemi.com

Share Link: