Datasheet > M74HC221AF1R

M74HC221AF1R

更新时间： 2024-11-01 22:57:55

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		振荡器
页数	文件大小	规格书
14页	290K
描述
DUAL MONOSTABLE MULTIVIBRATOR

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中文翻译

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数据手册

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M74HC221AF1R 数据手册

M54HC221/221A

M74HC221/221A

DUAL MONOSTABLE MULTIVIBRATOR

HIGH SPEED

t_PD= 25 ns (TYP) at V_CC= 5V

LOW POWER DISSIPATION

STANDBYSTATE I_CC=4 µA (MAX.) AT T_A=25°C

ACTIVESTATEI_CC=700µA (MAX.)AT V_CC=5V

HIGH NOISE IMMUNITY

_NIH= V_NIL= 28 % V_CC(MIN.)

B1R

F1R

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

SYMMETRICAL OUTPUT IMPEDANCE

I_OH= I_OL= 4 mA (MIN.)

BALANCED PROPAGATION DELAYS

t_PLH= t_PHL

WIDE OPERATING VOLTAGE RANGE

V_CC(OPR) = 2 V TO 6 V

WIDE OUTPUT PULSE WIDTH RANGE

t_WOUT= 150 ns 60 s OVER AT V_CC= 4.5 V

PIN AND FUNCTION COMPATIBLE WITH

54/74LS221

(Plastic Package)

(Ceramic Package)

M1R

C1R

(Micro Package)

(Chip Carrier)

ORDER CODES :

M54HCXXXF1R

M74HCXXXXM1R

M74HCXXXB1R

M74HCXXXC1R

PIN CONNECTIONS (top view)

DESCRIPTION

The M54/74HC221/221A are high speed CMOS

MONOSTABLE multivibrators fabricated with sili-

con gate C²MOS technology. It achieves the high

speed operation similar to equivalent LSTTL while

maintaining the CMOS low power dissipation. There

are two trigger inputs, AINPUT (negative edge) and

B INPUT (positive edge). Triggering on the B input

occurs at a particular voltage threshold and is not re-

lated to the rise and fall time of the applied pulse.

The device may also be triggered by using the CLR

input (positive-edge) because of the Schmitt-trigger

input ; after triggering the output maintains the

MONOSTABLEstate for the time period determined

by the external resistor Rx and capacitor Cx.Taking

CLR low breaks this MONOSTABLE STATE. If the

next trigger pulse occurs during the MONOSTABLE

period it makes the MONOSTABLE period longer.

Limit for values of Cx and Rx :

Cx : NO LIMIT

Rx : V_CC< 3.0 V 5 K Ω to 1 M Ω

V_CC≥ 3.0 V 1 K Ω to 1 M Ω

Two different pulse width constants are available:

0.7 for HC221

1 for HC221A

NC =

No Internal

Connection

All inputs are equipped with protection circuits

against static discharge and transient excess volt-

age.

October 1993

1/14

12 3 4 5 6 7...14

中文翻译

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