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參數資料
| 型號： | HD74HC161 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Octal Buffers/Drivers With 3-State Outputs 20-CFP -55 to 125 |
| 中文描述： | 同步十年,4 -位二進制計數器（直接清除，同步清除） |
| 文件頁數： | 1/16頁 |
| 文件大?。?/td> | 90K |
| 代理商： | HD74HC161 |
HD74HC160/HD74HC161/
HD74HC162/HD74HC163
Synchronous Decade Counter (Direct Clear)
Synchronous 4-bit Binary Counter (Direct Clear)
Synchronous Decade Counter (Synchronous Clear)
Synchronous 4-bit Binary Counter (Synchronous Clear)
Description
The HD74HC160 and the HD74HC162 are 4 bit decade counters, and the HD74HC161 and the
HD74HC163 are 4 bit binary counters All flip-flops are clocked simultaneously on the low to high to
transition (positive edge) of the clock input waveform.
These counters may be preset using the load input. Presetting of all four flip-flops is synchronous to thte
rising edge of clock. When load is held low counting is disabled and the data on the A, B, C, and D inputs
is loaded into the counter on the rising edge of clock. If the load input is taken high before the positive
edge of clock the count operation will be unaffected.
All of these counters may be cleared by utilizing the clear input. The clear function on the HD74HC162
and HD74HC163 counters are synchronous to the clock. That is, the counters are cleared on the positive
edge of clock while the clear input is held low.
The HD74HC160 and HD74HC161 counters are cleared asynchronously. When the clear is taken low the
counter is cleared immediately regardless of the clock.
Two active high enable inputs Enable P and Enable T and a ripple carry output are provided to enable easy
cascading of counters. Both enable inputs must be high to count. The Enable T input also enables the
Ripple Carry output. When enabled, the Ripple Carry outputs a positive pulse when the counter overflows.
This pulse is approximately equal in duration to the high level portion of the Q
A
outputs. The Ripple Carry
output is fed to successive cascaded stages to facilitate easy implementation of N-bit counters.
Features
High Speed Operation: t
pd
(Clock to Q) = 18 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
相關PDF資料 |
PDF描述 |
|---|---|
| HD74HC162 | Octal Buffers/Drivers With 3-State Outputs 20-LCCC -55 to 125 |
| HD74HC163 | Octal Buffers/Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| HD74HC164 | Octal Buffers/Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| HD74HC165 | Octal Buffers/Drivers With 3-State Outputs 20-LCCC -55 to 125 |
| HD74HC166 | Octal Buffers/Drivers With 3-State Outputs 20-CDIP -55 to 125 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HD74HC162FP | 制造商:Renesas Electronics 功能描述:74HC |
| HD74HC162FP(E) | 制造商:Renesas Electronics 功能描述:74HC 制造商:Renesas Electronics 功能描述:74HC Bulk |
| HD74HC163P(E) | 制造商:Renesas Electronics Corporation 功能描述: |
| HD74HC164FP-E | 制造商:Renesas Electronics 功能描述:74HC 8-Bit serial in / parallel-out shift register 制造商:Renesas Electronics Corporation 功能描述:Logic, 74HC series, SOP-14 |
| HD74HC164FPEL-E | 制造商:Renesas Electronics 功能描述:74HC 8-Bit serial in / parallel-out shift register 制造商:Renesas Electronics Corporation 功能描述:Logic, 74HC series, SOP-14 |
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