Datasheet > M74HC123F1R

M74HC123F1R

更新时间： 2024-11-22 22:10:59

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	293K
描述
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

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中文翻译

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数据手册

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M74HC123F1R 数据手册

M54HC123/123A

M74HC123/123A

DUAL RETRIGGERABLE 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

ACTIVESTATE I_CC=200 µA (TYP.) 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= 120 ns 60 s OVER AT V_CC= 4.5 V

PIN AND FUNCTION COMPATIBLE WITH

54/74LS123

(Plastic Package)

(Ceramic Package)

M1R

C1R

(Micro Package)

(Chip Carrier)

ORDER CODES :

M54HCXXXF1R

M74HCXXXM1R

M74HCXXXB1R

M74HCXXXC1R

PIN CONNECTIONS (top view)

DESCRIPTION

The M54/74HC123 is a high speed CMOS MONO-

STABLE multivibrator fabricated with silicon gate

C²MOS technology. It achieves the high speed

operation similar to equivalent LSTTL while main-

taining the CMOS low power dissipation. There are

two trigger inputs, A INPUT (negative edge) and 8

INPUT (positive edge). These inputs are valid for

slow rising/falling signals, (tr = tf = I sec). The device

may also be triggered by using the CLR input (posi-

tive-edge) because of the Schmitt-trigger input ;

after triggering the output maintains the MONO-

STABLE state for the time period determined by the

external resistor Rx and capacitor Cx. When Cx ≥

10nF and Rx ≥ 10KΩ, the output pulse width value

is approssimatively given by the formula: t_w(out)= K

• Cx • Rx.

Two different pulse width constant are available:

0.45 for HC123

1 for HC123A.

Taking CLR low breaks this MONOSTABLE

STATE. If the next trigger pulse occurs during the

MONOSTABLEperiod 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

NC =

No Internal

Connection

V_CC≥ 3.0 V 1 K Ω to 1 M Ω

All inputs are equipped with protection circuits

October 1993

1/14

12 3 4 5 6 7...14

中文翻译

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