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Número de pieza | 54AC169 | |
Descripción | 4-Stage Synchronous Bidirectional Counter | |
Fabricantes | National Semiconductor | |
Logotipo | ||
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July 1998
54AC169 • 54ACT169
4-Stage Synchronous Bidirectional Counter
General Description
The ’AC/’ACT169 is fully synchronous 4-stage up/down
counter. The ’AC/’ACT169 is a modulo-16 binary counter. It
features a preset capability for programmable operation,
carry lookahead for easy cascading and a U/D input to con-
trol the direction of counting. All state changes, whether in
counting or parallel loading, are initiated by the
LOW-to-HIGH transition of the Clock.
n Synchronous counting and loading
n Built-In lookahead carry capability
n Presettable for programmable operation
n Outputs source/sink 24 mA
n ’ACT has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
5962-91603
Features
n ICC reduced by 50%
Logic Symbols
DS100276-1
IEEE/IEC
Pin
Names
CEP
CET
CP
P0– P3
PE
U/D
Q0– Q3
TC
Description
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
Parallel Data Inputs
Parallel Enable Input
Up-Down Count Control Input
Flip-Flop Outputs
Terminal Count Output
DS100276-2
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100276
www.national.com
1 page DC Characteristics for ’AC Family Devices (Continued)
Symbol
Parameter
IOLD
IOHD
ICC
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent
Supply Current
54AC
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed
Limits
5.5 50
5.5 −50
5.5 80.0
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.
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
VIH Minimum High Level
Input Voltage
VIL Maximum Low Level
Input Voltage
VOH Minimum High Level
Output Voltage
54ACT
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed
Limits
4.5 2.0
5.5 2.0
4.5 0.8
5.5 0.8
4.5 4.4
5.5 5.4
Units
mA
mA
µA
Units
V
V
V
VOL Maximum Low Level
Output Voltage
4.5
5.5
4.5
5.5
3.70
4.70
0.1
0.1
V
V
IIN
ICCT
IOLD
IOHD
ICC
Maximum Input
Leakage Current
Maximum
ICC/Input
Minimum Dynamic
Output Current (Note 6)
Maximum Quiescent
Supply Current
4.5
5.5
5.5
5.5
5.5
5.5
5.5
Note 5: All outputs loaded; thresholds on input associated with output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
Note 7: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.
0.50
0.50
±1.0
1.6
50
−50
80.0
V
µA
mA
mA
mA
µA
Conditions
VOLD = 1.65V Max
VOHD = 3.85V Min
VIN = VCC
or GND
Conditions
VOUT = 0.1V
or VCC − 0.1V
VOUT = 0.1V
or VCC − 0.1V
IOUT = −50 µA
(Note 5)
VIN = VIL or VIH
IOH = −24 mA
IOH = −24 mA
IOUT = 50 µA
(Note 5)
VIN = VIL or VIH
IOL = 24 mA
IOL = 24 mA
VI = VCC, GND
VI = VCC − 2.1V
VOLD = 1.65V Max
VOHD = 3.85V Min
VIN = VCC
or GND
5 www.national.com
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet 54AC169.PDF ] |
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