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HD74HC190 の電気的特性と機能

HD74HC190のメーカーはHitachi Semiconductorです、この部品の機能は「Synchronous Up/Down Decade/4-bit Binary Counter(Single Clock Line)」です。


製品の詳細 ( Datasheet PDF )

部品番号 HD74HC190
部品説明 Synchronous Up/Down Decade/4-bit Binary Counter(Single Clock Line)
メーカ Hitachi Semiconductor
ロゴ Hitachi Semiconductor ロゴ 




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HD74HC190 Datasheet, HD74HC190 PDF,ピン配置, 機能
HD74HC190/HD74HC191
Synchronous Up/Down Decade Counter (Single Clock Line)
Synchronous Up/Donw 4-bit Binary Counter (Single Clock Line)
Description
The HD74HC190 and HD74HC191 are synchronous, reverside up/down counters. The HD74HC190 is a
4-bit decade counter and the HD74HC191 is a 4-bit binary counter. Synchronous counting operation is
provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each
other when so instructed by the steering logic. This mode of operation eliminates the output counting
spikes normally associated with asynchronous (ripple clock) counters.
The outputs of the four flip-flops are triggered on a low-to-high-level transition of the clock input if the
Enable G input is low. A high at Enable G inhibits counting. The direction of the count is determined by
the level of the Down/ Up (D/U) input. When D/U is low, the counter counts up and when D/U is high, it
counts down.
These counters feature a fully independent clock circuit. Changes at the control inputs (D/U) that will
modify the operating mode have no effect on the contents of the counter until clocking occurs. The
function of the counter will be dictated solely by the condition meeting the stable setup and hold times.
These counters are fully programmable; that is, the outputs may each be preset to either level by placing a
low on the load input and entering the desired data at the data inputs. The output will change to agree with
the data inputs independently of the level of the clock input. This feature allows the counters to be used as
modulo-N dividers by simply modifying the count length with the preset inputs.
Two outputs have been made available to perform the cascading function. Ripple clock and
maximum/minimum count. The latter output produces a high-level output pulse with a duration
approximately qual to one complete cycle of the clock while the count is zero (all outputs low) counting
down or maximum (9 or 15) counting up. The ripple clock output produces a low-level output pulse under
those same conditions but only while the clock input is low. The counters can be easily cascaded by
feeding the ripple clock output to the enable input of the succeeding counter if parallel clocking is used, or
to the clock input if paralle enabling is used. The maximum/minimum count output can be used to
accomplish look-ahead for high-speed operation.

1 Page





HD74HC190 pdf, ピン配列
HD74HC190/HD74HC191
Timing Chart
HD74HC190
Illustrated below is the following sequence:
1. Load (preset) to BCD seven.
2. Count up to eight, nine (maximum), zero, one and two.
3. Inhibit
4. Count down to one, zero (minimum), nine, eight and seven.
Load
A
B
C
D
Clock
Down/Up
Enable G
QA
QB
QC
QD
Max/Min
Ripple
Clock
7 8 9 0 12
221 0 9 8 7
Load
Count Up
Inhibit
Count Down
3


3Pages


HD74HC190 電子部品, 半導体
HD74HC190/HD74HC191
HD74HC191
Clock
Down/Up
Input A
Enable G
Input B
Input C
Input D
Load
CK P Q
CK A
INCL Q
CK P Q
CK B
INCL Q
CK P Q
CK C
INCL Q
CK P Q
CK D
INCL Q
Ripple
Clock
Max/Min
Output
QA
QB
QC
QD
6

6 Page



ページ 合計 : 13 ページ
 
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[ HD74HC190 データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
HD74HC190

Synchronous Up/Down Decade/4-bit Binary Counter(Single Clock Line)

Hitachi Semiconductor
Hitachi Semiconductor
HD74HC191

Synchronous Up/Down Decade/4-bit Binary Counter(Single Clock Line)

Hitachi Semiconductor
Hitachi Semiconductor
HD74HC192

Synchronous Up/Down Decade/4-bit Binary Counter(Dual Clock Line)

Hitachi Semiconductor
Hitachi Semiconductor
HD74HC193

Synchronous Up/Down Decade/4-bit Binary Counter(Dual Clock Line)

Hitachi Semiconductor
Hitachi Semiconductor


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