HD74HC490 - Dual 4-bit Decade Counters

Product Overview

Hitachi Semiconductor

Part number	HD74HC490
Manufacturer	Hitachi Semiconductor
File Size	44.31 KB
Description	Dual 4-bit Decade Counters
Datasheet	HD74HC490 Datasheet
Additional preview pages of the HD74HC490 datasheet.

This circuit contains eight master-slave flip-flops and additional gating to implement two individual 4-bit decade counters.

Each decade counter has individual clock, clear and set-to-9 inputs.

BCD count sequences of any length up to divide-by-100 may be implemented with a single HD74HC490.

High Speed Operation: tpd (Clock to QA) = 13 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Clear/Set-To-9 Inputs Clear H L L Set-To-9 L H L Outputs QA L H Count QB L L QC L L QD L H HD74HC490 BCD Count Sequence Outputs Count 0 1 2 3 4 5 6 7 8 9 QD L L L L L L L L H H QC L L L L H.

Other Datasheets by Hitachi Semiconductor

Published: Mar 23, 2005 |