M74HC191C1R

更新时间： 2024-11-04 22:53:23

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		计数器
页数	文件大小	规格书
14页	301K
描述
4 BIT SYNCHRONOUS UP/DOWN COUNTERS

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数据手册

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M74HC191C1R 数据手册

M54/M74HC190

M54/M74HC191

4 BIT SYNCHRONOUS UP/DOWN COUNTERS

HIGH SPEED

f_MAX= 48 MHz (TYP.) AT V_CC= 5 V

LOW POWER DISSIPATION

I_CC= 4 µA (MAX.) AT T_A= 25 °C

HIGH NOISE IMMUNITY

V_NIH= V_NIL= 28 % V_CC(MIN.)

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

B1R

(Plastic Package)

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

V_CC(OPR) = 2 V TO 6 V

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS190/191

ORDER CODES :

M54HCXXXF1R

M74HCXXXB1R

M74HCXXXM1R

M74HCXXXC1R

PIN CONNECTIONS (top view)

DESCRIPTION

The M54/74HC190/191 are high speed CMOS4-BIT

SYNCHRONOUS UP/DOWN COUNTERS fabri-

cated in silicon gate C²MOS technology.

They have the same high speed performance of

LSTTL combined with true CMOS low power con-

sumption.

State changes of the counter are synchronous with

the LOW-to-HIGH transition of the Clock Pulse input.

An asynchronous parallel load input overrides count-

ing and loads the data present on the DATA inputs into

the flip-flops, which makes it possible to use the cir-

cuitsasprogrammable counters. Acountenable input

serves as the carry/borrow input in multi-stage

counters. Control input, Down/Up, determines

whether a circuit counts up or down. A MAX/MIN out-

putand a RippleClockoutput provide overflow/under-

flow indication and make possible a variety of

methods for generating carry/borrow signals in multi-

stage counter applications.

NC =

No Internal

Connection

Allinputs are equipped with protection circuits against

static discharge and transient excess voltage.

October 1992

1/14

12 3 4 5 6 7...14

中文翻译

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