- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370478 > HD74HC490 (Hitachi,Ltd.) Dual 4-bit Decade Counters PDF資料下載
參數(shù)資料
| 型號(hào)： | HD74HC490 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Dual 4-bit Decade Counters |
| 中文描述： | 雙4位十年計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 44K |
| 代理商： | HD74HC490 |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD74HC51 | 2-wide 2-input, 2-wide 3-input AND-OR-INVERT Gate |
| HD74HC533 | Octal D-type Flip-Flops With Clear 20-CDIP -55 to 125 |
| HD74HC373 | Octal D-type Transparent Latches (with 3-state outputs),Octal D-type Transparent Latches (with inverted 3-state outputs) |
| HD74HC534 | Octal D-type Flip-Flops (with 3-state outputs),Octal D-type Flip-flops (with inverted 3-state outputs) |
| HD74HC374 | Octal D-type Flip-Flops (with 3-state outputs),Octal D-type Flip-flops (with inverted 3-state outputs) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD74HC51FP | 制造商:Renesas Electronics 功能描述:74HC |
| HD74HC51FP-E | 制造商:Renesas Electronics Corporation 功能描述: |
| HD74HC51P | 制造商:Hitachi 功能描述: |
| HD74HC51P-E | 制造商:Renesas Electronics Corporation 功能描述: |
| HD74HC540FP-E | 制造商:Renesas Electronics Corporation 功能描述:Logic, 74HC series, SOP-20 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。