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PDF 54ACT521 Data sheet ( Hoja de datos )
| Número de pieza | 54ACT521 | |
| Descripción | 8-Bit Identity Comparator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 1998
54AC521 • 54ACT521
8-Bit Identity Comparator
General Description
The AC/ACT521 is an expandable 8-bit comparator. It com-
pares two words of up to eight bits each and provides a LOW
output when the two words match bit for bit. The expansion
input IA = B also serves as an active LOW enable input.
Features
n ICC reduced by 50%
n Compares two 8-bit words in 6.5 ns typ
n Expandable to any word length
n Outputs source/sink 24 mA
n ACT521 has TTL-compatible inputs
n Standard microcircuit Drawing (SMD)
54AC521: 5962-90985
54ACT521: 5962-89793
Logic Symbols
Connection Diagram
Pin Assignment
for DIP and CERPACK
IEEE/IEC
DS100291-1
DS100291-2
Pin Assignment
for LCC
DS100291-4
DS100291-3
Pin Descriptions
Pin Names
A0–A7
B0–B7
TA = B
OA = B
Description
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100291
www.national.com
1 page  
AC Electrical Characteristics for ACT
Symbol
Parameter
tPLH Propagation Delay
An or Bn to OA = B
tPHL Propagation Delay
An or Bn to OA = B
tPLH Propagation Delay
IA = B to OA = B
tPHL Propagation Delay
IA = B to OA = B
Note 9: Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 9)
5.0
5.0
5.0
5.0
Capacitance
Symbol
CIN
CPD
Parameter
Input Capacitance
Power Dissipation Capacitance
TA = −55˚C to +125˚C
CL = 50 pF
Min Max
1.5 11.0
1.5 12.0
1.5 7.5
1.5 8.5
Units
ns
ns
ns
ns
Typ Units
Conditions
4.5 pF VCC = OPEN
40 pF VCC = 5.0V
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| PDF Descargar | [ Datasheet 54ACT521.PDF ] | |
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