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PDF 54AC191 Data sheet ( Hoja de datos )
| Número de pieza | 54AC191 | |
| Descripción | Up/Down Counter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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  
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI = −0.5V
VI = VCC + 0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO = −0.5V
VO = VCC + 0.5V
DC Output Voltage (VO)
DC Output Source
or Sink Current (IO)
DC VCC or Ground Current
per Output Pin (ICC or IGND)
Storage Temperature (TSTG)
−0.5V to +7.0V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
±50 mA
±50 mA
−65˚C to +150˚C
Junction Temperature (TJ)
CDIP
175˚C
Recommended Operating
Conditions
Supply Voltage (VCC)
Input Voltage (VI)
Output Voltage (VO)
Operating Temperature (TA)
54AC
2.0V to 6.0V
0V to VCC
0V to VCC
−55˚C to +125˚C
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V 4.5V, 5.5V
125 mV/ns
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, output/input loading variables. National does not recommend
operation of FACT™ circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
Symbol
Parameter
VIH Minimum High Level Input
Voltage
VIL Maximum Low Level Input
Voltage
VOH Minimum High Level Output
Voltage
VCC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
VOL
Maximum Low Level Output
3.0
Voltage
4.5
5.5
IIN
IOLD
IOHD
ICC
Maximum Input
Leakage Current
(Note 3) Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
3.0
4.5
5.5
5.5
5.5
5.5
5.5
54AC
TA = −55˚C to +125˚C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.4
3.7
4.7
0.1
0.1
0.1
0.50
0.50
0.50
±1.0
50
−50
80.0
Units
Conditions
VOUT = 0.1V
V or VCC − 0.1V
VOUT = 0.1V
V or VCC − 0.1V
IOUT = −50 µA
V
(Note 2) VIN = VIL
or VIH
−12 mA
V IOH −24 mA
−24 mA
IOUT = 50 µA
V
(Note 2) VIN = VIL
or VIH
12 mA
V IOL 24 mA
24 mA
µA VI = VCC, GND
mA VOLD = 1.65V Max
mA VOHD = 3.85V Min
µA VIN = VCC
or GND
5 www.national.com
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 54AC191.PDF ] | |
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