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PDF 74ACT521SJ Data sheet ( Hoja de datos )
| Número de pieza | 74ACT521SJ | |
| Descripción | 8-Bit Identity Comparator | |
| Fabricantes | Fairchild Semiconductor | |
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November 1988
Revised November 1999
74AC521 • 74ACT521
8-Bit Identity Comparator
General Description
The AC/ACT521 is an expandable 8-bit comparator. It
compares 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
s ICC reduced by 50%
s Compares two 8-bit words in 6.5 ns typ
s Expandable to any word length
s 20-pin package
s Outputs source/sink 24 mA
s ACT521 has TTL-compatible inputs
Ordering Code:
Order Number
74AC521SC
74AC521SJ
74AC521PC
74ACT521SC
74ACT521SJ
Package Number
Package Description
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT521PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering table.
Logic Symbols
Connection Diagram
IEEE/IEC
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation DS009964
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
www.fairchildsemi.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
Capacitance
VCC
(V)
(Note 9)
5.0
5.0
5.0
5.0
TA = +25°C
CL = 50 pF
Min Typ Max
3.0 5.5 9.0
TA = −40°C to +85°C
CL = 50 pF
Min Max
2.5 9.5
3.0 6.0 10.0 2.5 11.0
2.0 4.0 6.5 2.0 7.0
2.5 5.0 7.5 2.0 8.0
Symbol
CIN
CPD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ Units
Conditions
4.5 pF VCC = OPEN
40 pF VCC = 5.0V
Units
ns
ns
ns
ns
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 74ACT521SJ.PDF ] | |
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