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PDF 74ACT521 Data sheet ( Hoja de datos )
| Número de pieza | 74ACT521 | |
| Descripción | 8-BIT IDENTITY COMPARATOR | |
| Fabricantes | Motorola Inc | |
| Logotipo |  |
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8ĆBit Identity Comparator
The MC74AC521/74ACT521 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.
• Compares Two 8-Bit Words in 6.5 ns Typ
• Expandable to Any Word Length
• 20-Pin Package
• Outputs Source/Sink 24 mA
• ′ACT521 has TTL-Compatible Inputs
VCC OA=B B7 A7 B6 A6 B5 A5 B4 A4
20 19 18 17 16 15 14 13 12 11
MC74AC521
MC74ACT521
8-BIT IDENTITY
COMPARATOR
N SUFFIX
CASE 738-03
PLASTIC
1 2 3 4 5 6 7 8 9 10
IA=B A0 B0 A1 B1 A2 B2 A3 B3 GND
DW SUFFIX
CASE 751D-04
PLASTIC
PIN NAMES
A0–A7
B0–B7
IA=B
OA=B
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
TRUTH TABLE
Inputs
Outputs
IA=B
L
L
H
H
A, B
A = B*
A≠B
A = B*
A≠B
OA=B
L
H
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
*A0=B0, A1=B1, A2=B2, etc.
LOGIC SYMBOL
B7 A7 B6 A6 B5 A5 B4 A4 B3 A3 B2 A2 B1 A1 B0 A0
IA=B
OA=B
FACT DATA
5-1
1 page  
MC74AC521 MC74ACT521
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74ACT
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
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
* Voltage Range 5.0 V is 5.0 V ±0.5 V.
Min Typ Max
5.0 3.0
9.0
5.0 3.0
10
5.0 2.0
6.5
5.0 2.5
7.5
74ACT
TA = –40°C
to +85°C
CL = 50 pF
Min Max
2.5 9.5
2.5 11
2.0 7.0
2.0 8.0
Unit
ns
ns
ns
ns
Fig.
No.
3-6
3-6
3-6
3-6
CAPACITANCE
Symbol
Parameter
CIN
CPD
Input Capacitance
Power Dissipation Capacitance
Value
Typ
4.5
40
Unit
pF
pF
Test Conditions
VCC = 5.0 V
VCC = 5.0 V
APPLICATIONS
RIPPLE EXPANSION
A0 B0
A7 B7
........
ENABLE
LOW
IA=B
OA=B
A8 B8
A15 B15
........
IA=B
OA=B
A16 B16 A23 B23
........
IA=B
OA=B
PARALLEL EXPANSION
A0 B0
A7 B7
........
ENABLE
LOW
IA=B
OA=B
A8 B8
A15 B15
........
IA=B
OA=B
A16 B16 A23 B23
........
IA=B
OA=B
FACT DATA
5-5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet 74ACT521.PDF ] | |
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