M74HC390 데이터 시트보기 (PDF) - STMicroelectronics

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M74HC390

Dual decade counter

STMicroelectronics 

M74HC390

Dual decade counter

Features

■ HIgh Speed:

fMAX = 79MHz (Typ.) at VCC = 6V

■ Low power dissipation:

ICC = 4µA (Max.) at TA = 25°C

■ High noise immunity:

VNIH = VNIL = 28 % VCC (Min.)

■ Balanced propagation delays:

tPLH ≅ tPHL

■ Wide operating voltage range:

VCC (Opr) = 2V to 6V

■ Pin and function compatible with 74 series 390

Description

The M74HC390 is an high speed CMOS dual

decade counter fabricated with silicon gate

C2MOS technology.

This dual decade counter contains two

independent ripple carry counters. Each counter

is composed of a divide by two and divide by five

counter. The divide by two and divide by five

counters can be cascaded to form dual decade,

dual biquinary, or various combination up to a

single divide by 100 counter.

DIP-16

SO-16

Each 4-bit counter is increased on the high to low

transition (negative edge) of the clock input, and

each has an independent clear input. When clear

is set low all four bits of each counter are set to

low. This enables count truncation and allows the

implementation of divide by N counter

configuration.

All inputs are equipped with protection circuits

against static discharge and transient excess

voltage.

Order codes

Part number

M74HC390B1R

M74HC390RM13TR

Package

DIP-14

SO-14

Packaging

Tube

Tape and reel

July 2006

Rev 2

1/17

www.st.com

17

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