M74HC221 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M74HC221

DUAL MONOSTABLE MULTIVIBRATOR

STMicroelectronics 

M74HC221

DUAL MONOSTABLE MULTIVIBRATOR

s HIGH SPEED :

tPD = 24 ns (TYP.) at VCC = 6V

s LOW POWER DISSIPATION:

STAND BY STATE :

ICC=4µA (MAX.) at TA=25°C

ACTIVE STATE :

ICC=700µA (MAX.) at VCC = 5V

s HIGH NOISE IMMUNITY:

VNIH = VNIL = 28 % VCC (MIN.)

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 4mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s WIDE OPERATING VOLTAGE RANGE:

VCC (OPR) = 2V to 6V

s WIDE OUTPUT PULSE WIDTH RANGE :

tWOUT = 150 ns ~ 60 s OVER AT VCC = 4.5 V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 221

DESCRIPTION

The M74HC221 is an high speed CMOS

MONOSTABLE MULTIVIBRATOR fabricated with

silicon gate C2MOS technology.

There are two trigger inputs, A INPUT (negative

edge) and B INPUT (positive edge).

Triggering on the B input occurs at a particular

voltage threshold and is not related to rise and fall

time of the applied pulse. The device may also be

trigger by using the CLR input (positive edge)

because of the Schimtt-trigger input; after

PIN CONNECTION AND IEC LOGIC SYMBOLS

DIP

SOP

TSSOP

ORDER CODES

PACKAGE

TUBE

DIP

SOP

TSSOP

M74HC221B1R

M74HC221M1R

T&R

M74HC221RM13TR

M74HC221TTR

triggering the output maintains the

MONOSTABLE STATE 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 : Vcc < 3.0V 5KΩ to 1MΩ

Vcc > 3.0V 1KΩ to 1MΩ

K ≅ 0.7

All inputs are equipped with protection circuits

against static discharge and transient excess

voltage.

July 2001

1/14

Share Link: