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參數(shù)資料
| 型號： | HC49 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | ECM Standard Crystal |
| 中文描述： | 流腦標準水晶 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 44K |
| 代理商： | HC49 |
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
L
Q
B
L
Q
C
L
Q
D
L
H
L
L
H
H
L
L
H
L
L
Count
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HC-49 | 制造商:RALTRON 制造商全稱:RALTRON 功能描述:LOW PROFILE MICROPROCESSOR CRYSTALS |
| HC49 6.176MHZ | 制造商:CTS Corporation 功能描述: |
| HC49/232S3 | 制造商:GOLLEDGE 制造商全稱:GOLLEDGE 功能描述:STANDARD CRYSTAL |
| HC49/351DF | 制造商:GOLLEDGE 制造商全稱:GOLLEDGE 功能描述:STANDARD CRYSTAL |
| HC49/4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ECM Standard Low Profile Crystal |
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