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54AC191のメーカーはNational Semiconductorです、この部品の機能は「Up/Down Counter」です。 |
部品番号 | 54AC191 |
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部品説明 | Up/Down Counter | ||
メーカ | National Semiconductor | ||
ロゴ | |||
このページの下部にプレビューと54AC191ダウンロード(pdfファイル)リンクがあります。 Total 10 pages
www.DataSheet4U.com
July 1998
54AC191
Up/Down Counter with Preset and Ripple Clock
General Description
The ’AC191 is a reversible modulo 16 binary counter. It fea-
tures synchronous counting and asynchronous presetting.
The preset feature allows the ’AC191 to be used in program-
mable dividers. The Count Enable input, the Terminal Count
output and the Ripple Clock output make possible a variety
of methods of implementing multistage counters. In the
counting modes, state changes are initiated by the rising
edge of the clock.
Features
n ICC reduced by 50%
n High speed — 133 MHz typical count frequency
n Synchronous counting
n Asynchronous parallel load
n Cascadable
n Outputs source/sink 24 mA
n Standard Military Drawing (SMD)
— ’AC191: 5962-89749
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP and Flatpack
DS100279-1
IEEE/IEC
DS100279-3
Pin Assignment for LCC
DS100279-2
Pin Names
CE
CP
P0–P3
PL
U/D
Q0–Q3
RC
TC
Description
Count Enable Input
Clock Pulse Input
Parallel Data Inputs
Asynchronous Parallel Load Input
Up/Down Count Control Input
Flip-Flop Outputs
Ripple Clock Output
Terminal Count Output
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100279
DS100279-4
www.national.com
1 Page Functional Description (Continued)
FIGURE 1. N-Stage Counter Using Ripple Clock
DS100279-7
DS100279-8
FIGURE 2. Synchronous N-Stage Counter Using Ripple Carry/Borrow
DS100279-9
FIGURE 3. Synchronous N-Stage Counter with Parallel Gated Carry/Borrow
3 www.national.com
3Pages DC Characteristics for ’AC Family Devices (Continued)
Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C.
AC Electrical Characteristics
Symbol
Parameter
fmax Maximum Count
Frequency
tPLH Propagation Delay
CP to Qn
tPHL Propagation Delay
CP to Qn
tPLH Propagation Delay
CP to TC
tPHL Propagation Delay
CP to TC
tPLH Propagation Delay
CP to RC
tPHL Propagation Delay
CP to RC
tPLH Propagation Delay
CE to RC
tPHL Propagation Delay
CE to RC
tPLH Propagation Delay
U/D to RC
tPHL Propagation Delay
U/D to RC
tPLH Propagation Delay
U/D to TC
tPHL Propagation Delay
U/D to TC
tPLH Propagation Delay
Pn to Qn
tPHL Propagation Delay
Pn to Qn
tPLH Propagation Delay
PL to Qn
tPHL Propagation Delay
PL to Qn
Note 5: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 5)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
54AC
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
55
80
1.0 16.5
1.0 12.0
1.0 16.0
1.0 12.0
1.0 19.5
1.0 14.0
1.0 19.0
1.0 14.5
1.0 14.0
1.0 10.5
1.0 12.5
1.0 9.5
1.0 14.0
1.0 10.0
1.0 12.5
1.0 9.5
1.0 14.5
1.0 11.0
1.0 15.0
1.0 11.0
1.0 14.0
1.0 10.5
1.0 13.5
1.0 10.0
1.0 16.5
1.0 11.5
1.0 15.5
1.0 10.5
1.0 18.0
1.0 12.5
1.0 15.5
1.0 11.5
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Fig.
No.
www.national.com
6
6 Page | |||
ページ | 合計 : 10 ページ | ||
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PDF ダウンロード | [ 54AC191 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。 |
部品番号 | 部品説明 | メーカ |
54AC191 | Up/Down Counter | National Semiconductor |
54AC191 | 54AC191 Up/Down Counter with Preset and Ripple Clock | Texas Instruments |