Datasheet > IZ74HC221AZ

IZ74HC221AZ

更新时间： 2024-09-14 23:15:07

品牌	Logo	应用领域
INTEGRAL		振荡器
页数	文件大小	规格书
7页	284K
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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IZ74HC221AZ 数据手册

IN74HC221A

DUAL MONOSTABLE MULTIVIBRATOR

The IN74HC221A is identical in pinout to the LS/ALS221. The

device inputs are compatible with standard CMOS outputs; with

pullup resistors, they are compatible with LS/ALSTTL outputs.

There are two trigger inputs, A INPUT (negative edge) and

B INPUT (positive edge). These inputs are valid for rising/falling

N SUFFIX

PLASTIC

signals

The device may also be triggered by using the RESET input

D SUFFIX

SOIC

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

triggering the output maintains the MONOSTABLE state for the

ORDERING¹INFORMATION

IN74HC221AN Plastic

IN74HC221AD SOIC

IZ74HC221AZ Chip

T_A= -55° to 125° C for all

packages

time period determined by the external resistor R_EXTand

capacitor C_EXT. Taking RESET low breaks this MONOSTABLE

STATE. If the next trigger pulse occurs during the

MONOSTABLE period it makes the MONOSTABLE period

longer.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 3.0 to 6.0 V

• Low Input Current: 1.0 µA

• High Noise Immunity Characteristic of CMOS Devices

PIN ASSIGNMENT

LOGIC DIAGRAM

1R_EXT/C_EXT

1C_EXT

D_EXT

R_EXT

D_EXT

R_EXT

1RESET

C_EXT

2C_EXT

2RESET

PIN 16 =V_CC

PIN 8 = GND

2R_EXT/C_EXT

GND

FUNCTION TABLE

Inputs

Outputs

Note

RESET

Output

Enable

Inhibit

Note

L ^*

H ^*

(1) C_EXT, R_EXT, D_EXTare external components.

(2) D_EXTis a clamping diode.

Inhibit

Output

Enable

Output

Enable

Inhibit

The external capacitor is charged to V_CCin the stand-by

state, i.e. no trigger. When the supply voltage is turned off

C_Xis discharged mainly through an internal parasitic

diode. If C_Xis sufficiently large and V_CCdecreases rapidy,

there will be some possibility of damaging the I.C. with a

surge current or latch-up. If the voltage supply filter

capacitor is large enough and V_CCdecrease slowly, the

surge current is automatically limited and damage the I.C.

is avoided. The maximum forward current of the parasitic

diode is approximately 20 mA.

X = don’t care

^*- except for monostable period

12 3 4 5 6 7

中文翻译

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