Datasheet4U Logo Datasheet4U.com

HD74HC490 - Dual 4-bit Decade Counters

Description

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.

Features

  • 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.

📥 Download Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
HD74HC4017 Decade Counter / Divider Renesas
HD74HC4020 14-stage Binary Counter Renesas
HD74HC4022 Octal Counters/Dividers Renesas
HD74HC4024 7-stage Binary Counter Renesas
HD74HC4040 12-stage Binary Counter Renesas

Other Datasheets by Hitachi Semiconductor (now Renesas)

Part Number Description
HD74HC4017 Decade Counter/Divider
HD74HC4020 14-stage Binary Counter
HD74HC4022 Octal Counters/Dividers
HD74HC4024 7-stage Binary Counter
HD74HC4040 12-stage Binary Counter

Full PDF Text Transcription

Click to expand full text
HD74HC490 Dual 4-bit Decade Counters Description 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. Buffering on each output is provided to ensure that suceptibility to collector communication is reduced significantly. The counters have paralle outputs from each counter state so that submultiples of the input count frequency are available for system timing signals.
Published: |