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HC49

更新时间： 2024-01-18 04:50:33

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HC49 技术参数

生命周期：	Active	Reach Compliance Code：	unknown
风险等级：	5.63	Base Number Matches：	1

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.

Features

•

High Speed Operation: t_pd(Clock to Q_A) = 13 ns typ (C_L= 50 pF)

High Output Current: Fanout of 10 LSTTL Loads

Wide Operating Voltage: V_CC= 2 to 6 V

Low Input Current: 1 µA max

Low Quiescent Supply Current: I_CC(static) = 4 µA max (Ta = 25°C)

Function Table

Clear/Set-To-9

Inputs

Outputs

Clear

Set-To-9

Q_A

Q_B

Q_C

Q_D

Count

12 3 4 5 6 7 8

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型号	品牌	描述	获取价格	数据表
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HC-49	CITIZEN	AT-CUT CRYSTAL UNIT	获取价格
HC49/110E5160.0MHZ	GOLLEDGE	Parallel - 5Th Overtone Quartz Crystal, 160MHz Nom, ROHS COMPLIANT,RESISTANCE WELD PACKAGE	获取价格
HC49/110EF36.0MHZ	GOLLEDGE	Parallel - Fundamental Quartz Crystal, 36MHz Nom, ROHS COMPLIANT,RESISTANCE WELD PACKAGE-2	获取价格
HC49/111S324.0MHZ	GOLLEDGE	Series - 3Rd Overtone Quartz Crystal, 24MHz Nom, ROHS COMPLIANT,RESISTANCE WELD PACKAGE-2	获取价格
HC49/120SF16.1760MHZ	GOLLEDGE	Series - Fundamental Quartz Crystal, 16.176MHz Nom, ROHS COMPLIANT,RESISTANCE WELD PACKAGE	获取价格