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54AC191 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer 54AC191
Beschreibung Up/Down Counter
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 10 Seiten
54AC191 Datasheet, Funktion
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
FACTis a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100279
DS100279-4
www.national.com






54AC191 Datasheet, Funktion
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.
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