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Teilenummer | 54ACT161 |
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Beschreibung | Synchronous Presettable Binary Counter | |
Hersteller | National Semiconductor | |
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Gesamt 12 Seiten www.DataSheet4U.com
November 1998
54AC161 • 54ACT161
Synchronous Presettable Binary Counter
General Description
The ’AC/’ACT161 are high-speed synchronous modulo-16
binary counters. They are synchronously presettable for ap-
plication in programmable dividers and have two types of
Count Enable inputs plus a Terminal Count output for versa-
tility in forming synchronous multistage counters. The ’AC/
’ACT161 has an asynchronous Master Reset input that over-
rides all other inputs and forces the outputs LOW.
n Synchronous counting and loading
n High-speed synchronous expansion
n Typical count rate of 125 MHz
n Outputs source/sink 24 mA
n ’ACT161 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC161: 5962-89561
— ’ACT161: 5962-91722
Features
n ICC reduced by 50%
Logic Symbols
DS100274-1
Pin Names
CEP
CET
CP
MR
P0– P3
PE
Q0– Q3
TC
Description
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
Asynchronous Master Reset Input
Parallel Data Inputs
Parallel Enable Inputs
Flip-Flop Outputs
Terminal Count Output
IEEE/IEC
DS100274-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100274
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DC Characteristics for ’AC Family Devices (Continued)
Symbol
Parameter
Supply Current
54AC
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed Limits
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.
Units
Conditions
or GND
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
VIH Minimum High Level
Input Voltage (Note 7)
VIL Maximum Low Level
Input Voltage
VOH Minimum High Level
Output Voltage
VOL Maximum Low Level
Output Voltage
IIN
ICCT
IOLD
IOHD
ICC
Maximum Input
Leakage Current
Maximum
ICC/Input
Minimum Dynamic
Output Current (Note 6)
Maximum Quiescent
Supply Current
54ACT
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed Limits
4.5 3.0
5.5 3.0
4.5 0.8
5.5 0.8
4.5 4.4
5.5 5.4
4.5 3.70
5.5 4.70
4.5 0.1
5.5 0.1
4.5 0.50
5.5 0.50
5.5 ±1.0
5.5 1.6
5.5 50
5.5 −50
5.5 160
Units
V
V
V
V
V
V
µA
mA
mA
mA
µA
Conditions
VOUT = 0.1V
or VCC − 0.1V
VOUT = 0.1V
or VCC − 0.1V
IOUT = −50 µA
(Note 5)
VIN = VIL or 3.0V
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
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: For dynamic operation, a VIH level between 2.0 and 3.0V may be recognized by this device as a high logic level input. For static operation, a VIH ≥ 2.0V will
be recognized by this device as a high logic level input. Users are cautioned to verify that this will not affect their system.
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6
6 Page Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16 Lead Ceramic Flatpak (F)
NS Package Number W16A
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VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys- 2. A critical component in any component of a life support
tems which, (a) are intended for surgical implant into
device or system whose failure to perform can be rea-
the body, or (b) support or sustain life, and whose fail-
sonably expected to cause the failure of the life support
ure to perform when properly used in accordance
device or system, or to affect its safety or effectiveness.
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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Tel: 1-800-272-9959
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Email: [email protected]
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12 Page | ||
Seiten | Gesamt 12 Seiten | |
PDF Download | [ 54ACT161 Schematic.PDF ] |
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