Texas Instruments CD74HCT390E Manual

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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 NUMBER PACKAGE(1) BODY SIZE (NOM)

CD54HCT390F3A CDIP (16) 24.38 mm × 6.92 mm

CD74HC390M SOIC (16) 9.90 mm × 3.90 mm

CD74HCT390M SOIC (16) 9.90 mm × 3.90 mm

CD74HC390E PDIP (16) 19.31 mm × 6.35 mm

CD74HCT390E PDIP (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

2QA2Q B2QC2QD

R R 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.

Table of Contents

1 Features............................................................................1

2 Description.......................................................................1

3 Revision History.............................................................. 2

4 Pin Configuration and Functions...................................3

5 Specifications.................................................................. 4

5.1 Absolute Maximum Ratings........................................ 4

5.2 Recommended Operating Conditions(1) ..................... 4

5.3 Thermal Information....................................................4

5.4 Electrical Characteristics.............................................5

5.5 Prerequisite for Switching Characteristics ................. 6

5.6 Switching Characteristics............................................6

6 Parameter Measurement Information............................ 8

7 Detailed Description........................................................9

7.1 Overview.....................................................................9

7.2 Functional Block Diagram........................................... 9

7.3 Device Functional Modes..........................................10

8 Power Supply Recommendations................................11

9 Layout............................................................................. 11

9.1 Layout Guidelines..................................................... 11

10 Device and Documentation Support..........................12

10.1 Documentation Support.......................................... 12

10.2 Receiving Notification of Documentation Updates..12

10.3 Support Resources................................................. 12

10.4 Trademarks............................................................. 12

10.5 Electrostatic Discharge Caution..............................12

10.6 Glossary..................................................................12

11 Mechanical, Packaging, and Orderable

Information.................................................................... 12

3 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision D (November 2021) to Revision E (April 2022) Page

• Corrected table 7-3, QC value 6 from H to L.....................................................................................................10

Changes from Revision C (September 1997) to Revision D (November 2021) Page

• Updated the numbering, formatting, tables, figures, and cross-references throughout the doucment to reflect

modern data sheet standards............................................................................................................................. 1

• Updated pin names to match current TI naming conventions. 1CP0 is now 1CLK A; 1MR is now 1CLR; 1Q0 is