Használati útmutató Texas Instruments CD74HCT390E

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CD74HC390, CDx4HCT390 High-Speed CMOS Logic Dual Decade Ripple Counter

1 Features

•Two BCD decade or bi-quinary counters

•One package can be configured to divide-by-2, 4,

5, 10, 20, 25, 50, 100

•Two controller reset inputs to clear each decade

counter individually

•Fanout (over temperature range)

–Standard outputs: 10 LSTTL loads

–Bus driver outputs: 15 LSTTL loads

•Wide operating temperature range: -55°C to 125°C

•Balanced propagation delay and transition times

•Significant power reduction compared to LSTTL

logic ICs

•HC types

–2V to 6V operation

–High noise immunity: NIL = 30%, NIH = 30% of

VCC at VCC = 5V

•HCT types

–4.5 V to 5.5 V operation

–Direct LSTTL input logic compatibility, VIL = 0.8

V (max), VIH = 2 V (min)

–CMOS input compatibility, II ≤ 1 μA at VOL, VOH

2 Description

The SN74HC390 and ‘HCT390 devices include two

independent 4-bit decade ripple counters, falling-edge

clocked with asynchronous clear. Each counter is

divided into two sections, a divide-by-2 and divide-

by-5 counter, each of which has an independent clock

input. This allows for very flexible configuration of the

device.

Device Information

PART NUMBERPACKAGE(1) BODY SIZE (NOM)

CD54HCT390F3ACDIP (16)24.38 mm × 6.92 mm

CD74HC390MSOIC (16)9.90 mm × 3.90 mm

CD74HCT390MSOIC (16)9.90 mm × 3.90 mm

CD74HC390EPDIP (16)19.31 mm × 6.35 mm

CD74HCT390EPDIP (16)19.31 mm × 6.35 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

nCLKA

nCLR

2QA2QB2QC2QD

RR R

QQ

Q

Q

R

VCC = 16

GND = 8

nCLKB

Functional Block Diagram

CD74HC390, CD54HCT390, CD74HCT390

SCHS185E – SEPTEMBER 1997 – REVISED APRIL 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Termékspecifikációk