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PDF 54AC374 Data sheet ( Hoja de datos )
| Número de pieza | 54AC374 | |
| Descripción | Octal D Flip-Flop | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1998
54AC374 • 54ACT374
Octal D Flip-Flop with TRI-STATE® Outputs
General Description
The ’AC/’ACT374 is a high-speed, low-power octal D-type
flip-flop featuring separate D-type inputs for each flip-flop
and TRI-STATE outputs for bus-oriented applications. A buff-
ered Clock (CP) and Output Enable (OE) are common to all
flip-flops.
Features
n ICC and IOZ reduced by 50%
n Buffered positive edge-triggered clock
n TRI-STATE outputs for bus-oriented applications
n Outputs source/sink 24 mA
n See ’273 for reset version
n See ’377 for clock enable version
n See ’373 for transparent latch version
n See ’574 for broadside pinout version
n See ’564 for broadside pinout version with inverted
outputs
n ’ACT374 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC374: 5962-87694
— ’ACT374: 5962-87631
Logic Symbols
IEEE/IEC
DS100289-1
Pin
Names
D0– D7
CP
OE
O0– O7
Description
Data Inputs
Clock Pulse Input
TRI-STATE Output Enable Input
TRI-STATE Outputs
DS100289-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100289
www.national.com
1 page  
AC Electrical Characteristics
Symbol
Parameter
fmax Maximum Clock
Frequency
tPLH
tPHL
tPZH
Propagation Delay
CP to On
Propagation Delay
CP to On
Output Enable Time
tPZL Output Enable Time
tPHZ Output Disable Time
tPLZ Output Disable Time
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 8)
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
60
95
3.0 16.5
3.0 12.0
3.0 15.0
3.0 11.0
1.0 14.0
1.5 10.5
1.0 14.0
1.5 10.5
1.0 16.0
1.5 12.5
1.0 13.0
1.5 10.5
Units
MHz
ns
ns
ns
ns
ns
ns
Fig.
No.
AC Operating Requirements
Symbol
Parameter
ts Setup Time, HIGH or LOW
Dn to CP
th Hold Time, HIGH or LOW
Dn to CP
tw CP Pulse Width,
HIGH or LOW
Note 9: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 9)
3.3
5.0
3.3
5.0
3.3
5.0
54AC
TA = −55˚C
to +125˚C
CL = 50 pF
Guaranteed Minimum
6.5
5.0
1.0
1.5
6.5
5.0
Units
ns
ns
ns
Fig.
No.
AC Electrical Characteristics
Symbol
Parameter
fmax Maximum Clock
Frequency
tPLH Propagation Delay
CP to On
tPHL Propagation Delay
CP to On
tPZH Output Enable Time
VCC
(V)
(Note 10)
5.0
5.0
5.0
5.0
54ACT
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
70
1.5 12.0
1.5 11.5
1.5 11.5
Units
MHz
ns
ns
ns
5 www.national.com
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 54AC374.PDF ] | |
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