74AC521SCQR [TI]
AC SERIES, 8-BIT IDENTITY COMPARATOR, INVERTED OUTPUT, PDSO20, SOIC-20;
| 型号： | 74AC521SCQR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | AC SERIES, 8-BIT IDENTITY COMPARATOR, INVERTED OUTPUT, PDSO20, SOIC-20 光电二极管 输出元件 逻辑集成电路 |
| 文件： | 总10页 (文件大小：191K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 1993
54AC/74AC521 54ACT/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 ex-
Features
Y
CC
I
reduced by 50%
Y
Y
Y
Y
Y
Compares two 8-bit words in 6.5 ns typ
Expandable to any word length
20-pin package
pansion input I
input.
also serves as an active LOW enable
B
e
A
Outputs source/sink 24 mA
’ACT521 has TTL-compatible inputs
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP, Flatpak and SOIC
TL/F/9964–1
IEEE/IEC
TL/F/9964–2
Pin Assignment
for LCC
TL/F/9964–3
TL/F/9964–4
Pin Names
Description
A –A
Word A Inputs
0
7
7
B
B –B
0
Word B Inputs
T
Expansion or Enable Input
Identity Output
e
e
A
O
A
B
FACTTM is a trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/9964
RRD-B30M75/Printed in U. S. A.
Truth Table
Inputs
Outputs
I
A, B
O
e
A
e
A
B
B
e
i
e
i
L
L
A
A
A
A
B*
B
L
H
H
H
H
H
B*
B
e
e
H
L
HIGH Voltage Level
LOW Voltage Level
e
e
e
B , A B , etc.
2
*A
0
B , A
0
1
1
2
Logic Diagram
TL/F/9964–5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Recommended Operating
Conditions
Supply Voltage (V
’AC
’ACT
)
CC
2.0V to 6.0V
4.5V to 5.5V
b
a
0.5V to 7.0V
Supply Voltage (V
)
CC
DC Input Diode Current (I
)
IK
Input Voltage (V )
I
0V to V
0V to V
CC
e b
b
a
V
I
V
I
0.5V
a
20 mA
20 mA
Output Voltage (V
)
O
CC
e
V
CC
0.5V
Operating Temperature (T )
A
74AC/ACT
54AC/ACT
b
b
a
0.5V
DC Input Voltage (V )
I
0.5V to V
0.5V to V
CC
b
b
a
40 C to 85 C
§
55 C to 125 C
§
§
DC Output Diode Current (I
)
a
OK
§
e b
b
a
V
V
0.5V
a
20 mA
20 mA
O
O
Minimum Input Edge Rate (DV/Dt)
’AC Devices
e
V
CC
0.5V
a
DC Output Voltage (V
DC Output Source
)
O
0.5V
50 mA
50 mA
CC
V
V
from 30% to 70% of V
@
IN
CC
3.3V, 4.5V, 5.5V
125 mV/ns
125 mV/ns
CC
g
g
or Sink Current (I
)
O
Minimum Input Edge Rate (DV/Dt)
’ACT Devices
DC V
or Ground Current
CC
per Output Pin (I or I
CC
)
V
V
from 0.8V to 2.0V
@
GND
)
IN
4.5V, 5.5V
b
a
65 C to 150 C
CC
Storage Temperature (T
§
§
STG
Junction Temperature (T )
J
CDIP
PDIP
175 C
§
140 C
§
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, output/input loading variables. National does not recommend
operation of FACTTM circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
74AC
54AC
74AC
e
e
T
A
V
T
CC
A
e a
Symbol
Parameter
T
25 C
§
Units
Conditions
A
b
a
55 C to 125 C
b a
40 C to 85 C
(V)
§
§
§
§
Typ
Guaranteed Limits
e
0.1V
V
V
V
Minimum High Level
Input Voltage
3.0
4.5
5.5
1.5
2.1
2.1
2.1
V
IH
OUT
b
2.25
2.75
3.15
3.85
3.15
3.85
3.15
3.85
V
V
V
or V
CC
0.1V
e
Maximum Low Level
Input Voltage
3.0
4.5
5.5
1.5
0.9
0.9
0.9
V
OUT
0.1V
IL
b
2.25
2.75
1.35
1.65
1.35
1.65
1.35
1.65
or V
CC
0.1V
e b
OUT
Minimum High Level
Output Voltage
3.0
4.5
5.5
2.99
4.49
5.49
2.9
4.4
5.4
2.9
4.4
5.4
2.9
4.4
5.4
I
50 mA
OH
e
*V
IN
V
IL
or V
IH
b
b
b
3.0
4.5
5.5
2.56
3.86
4.86
2.4
3.7
4.7
2.46
3.76
4.76
12 mA
V
V
I
24 mA
24 mA
OH
e
e
V
OL
Maximum Low Level
Output Voltage
3.0
4.5
5.5
0.002
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
I
50 mA
OUT
*V
IN
V or V
IL IH
3.0
4.5
5.5
0.36
0.36
0.36
0.50
0.50
0.50
0.44
0.44
0.44
12 mA
V
I
24 mA
24 mA
OL
e
I
Maximum Input
Leakage Current
V
I
V , GND
CC
IN
g
g
g
1.0
5.5
0.1
1.0
mA
*All outputs loaded; thresholds on input associated with output under test.
3
DC Characteristics for ’AC Family Devices (Continued)
74AC
54AC
74AC
e
e
T
A
V
T
CC
A
e a
Symbol
Parameter
T
25 C
§
Units
Conditions
A
b
a
55 C to 125 C
b a
40 C to 85 C
(V)
§
§
§
§
Typ
Guaranteed Limits
e
²
I
I
I
Minimum Dynamic
5.5
5.5
50
75
mA
mA
V
V
V
1.65V Max
OLD
OHD
CC
OLD
Output Current
b
b
e
3.85V Min
OHD
50
75
e
Maximum Quiescent
Supply Current
V
CC
IN
5.5
4.0
80.0
40.0
mA
or GND
²
Maximum test duration 2.0 ms, one output loaded at a time.
@
@
3.0V are guaranteed to be less than or equal to the respective limit 5.5V V
Note: I and I
IN
.
CC
CC
@ @
for 54AC 25 C is identical to 74AC 25 C.
§ §
I
CC
DC Characteristics for ’ACT Family Devices
74ACT
54ACT
74ACT
e
e
T
A
V
T
CC
A
e a
Symbol
Parameter
T
25 C
§
Units
Conditions
A
b
a
55 C to 125 C
b a
40 C to 85 C
(V)
§
§
§
§
Typ
Guaranteed Limits
e
0.1V
V
V
V
Minimum High Level
Input Voltage
4.5
5.5
1.5
1.5
2.0
2.0
2.0
2.0
2.0
2.0
V
IH
OUT
V
V
V
b
or V
CC
0.1V
e
Maximum Low Level
Input Voltage
4.5
5.5
1.5
1.5
0.8
0.8
0.8
0.8
0.8
0.8
V
OUT
0.1V
IL
b
or V
CC
0.1V
e b
OUT
Minimum High Level
Output Voltage
4.5
5.5
4.49
5.49
4.4
5.4
4.4
5.4
4.4
5.4
I
50 mA
OH
e
*V
IN
V
IL
or V
IH
b
b
4.5
5.5
3.86
4.86
3.70
4.70
3.76
4.76
24 mA
24 mA
V
V
I
OH
e
e
V
OL
Maximum Low Level
Output Voltage
4.5
5.5
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
I
50 mA
OUT
*V
IN
V
or V
IL IH
4.5
5.5
0.36
0.36
0.50
0.50
0.44
0.44
24 mA
V
I
OL
24 mA
e
e
I
I
Maximum Input
Leakage Current
V
V
V
, GND
IN
I
I
CC
g
g
g
1.0
5.5
5.5
0.1
1.0
mA
mA
b
2.1V
Maximum
V
CCT
CC
0.6
1.6
50
1.5
75
I
/Input
CC
e
²
I
I
I
Minimum Dynamic
5.5
5.5
mA
mA
V
V
V
1.65V Max
e
3.85V Min
OLD
OHD
CC
OLD
Output Current
b
b
50
75
OHD
e
Maximum Quiescent
Supply Current
V
CC
IN
5.5
4.0
80.0
40.0
mA
or GND
*All outputs loaded; thresholds on input associated with output under test.
²
Maximum test duration 2.0 ms, one output loaded at a time.
@ @
for 54ACT 25 C is identical to 74ACT 25 C.
§ §
Note: I
CC
4
AC Electrical Characteristics
74AC
54AC
e b
74AC
e b
T
55 C
T
40 C
§
§
A
A
e a
A
V *
CC
(V)
T
25 C
§
50 pF
a
a
Symbol
Parameter
to 125 C
to 85 C
Units
§
50 pF
§
50 pF
e
C
L
e
e
C
C
L
L
Min
Typ
Max
Min
Max
Min
Max
t
t
t
t
Propagation Delay
3.3
5.0
3.5
2.5
7.0
5.0
11.0
8.0
1.0
1.5
15.0
10.5
3.0
2.0
12.0
9.0
PLH
PHL
PLH
PHL
ns
ns
ns
ns
A
or B to O
e
n A
n
B
Propagation Delay
or B to O
e
B
3.3
5.0
4.5
3.0
7.5
5.5
11.5
8.5
1.0
1.5
15.0
10.5
3.5
2.5
12.5
9.0
A
n
n
A
Propagation Delay
to O
3.3
5.0
3.0
2.5
5.5
4.0
8.0
6.0
1.0
1.5
10.5
8.0
2.5
2.0
9.0
7.0
I
e
e
B
A
B
A
Propagation Delay
to O
3.3
5.0
3.0
2.0
5.5
4.0
8.0
6.0
1.0
1.5
10.5
8.0
2.5
2.0
9.0
7.0
I
e
e
B
A
B
A
g
*Voltage Range 3.3 is 3.3V 0.3V
g
Voltage Range 5.0 is 5.0V 0.5V
AC Electrical Characteristics
74ACT
54ACT
74ACT
e b
e b
40 C
T
A
55 C
T
A
§
to 125 C
§
to 85 C
e a
A
V *
CC
(V)
T
25 C
§
50 pF
a
a
Symbol
Parameter
Units
§
50 pF
§
50 pF
e
C
L
e
e
C
C
L
L
Min
Typ
Max
Min
Max
Min
Max
t
t
t
t
Propagation Delay
PLH
PHL
PLH
PHL
5.0
5.0
5.0
5.0
3.0
5.5
6.0
4.0
5.0
9.0
1.5
11.0
12.0
7.5
2.5
9.5
11.0
7.0
ns
ns
ns
ns
A
or B to O
e
n A
n
B
Propagation Delay
or B to O
e
B
3.0
2.0
2.5
10.0
6.5
1.5
1.5
1.5
2.5
2.0
2.0
A
n
n
A
Propagation Delay
to O
I
e
e
B
A
B
A
Propagation Delay
to O
7.5
8.5
8.0
I
e
e
B
A
B
A
g
*Voltage Range 5.0 is 5.0V 0.5V
Capacitance
Symbol
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
Units
pF
Conditions
e
e
C
C
4.5
40
V
OPEN
5.0V
IN
CC
pF
V
CC
PD
5
Applications
Ripple Expansion
TL/F/9964–6
Parallel Expansion
TL/F/9964–7
Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
74AC 521
P
C
QR
Temperature Range Family
Special Variations
e
e
e
e
74AC
54AC
Commercial
Military
Commercial TTL-Compatible
Military TTL-Compatible
X
QR
Devices shipped in 13 reels
×
Commercial grade device with
burn-in
e
e
74ACT
54ACT
e
QB
Military grade device with
environmental and burn-in
processing shipped in tubes
Device Type
Package Code
Temperature Range
e
e
e
e
e
P
D
F
L
Plastic DIP
Ceramic DIP
Flatpak
Leadless Ceramic Chip Carrier (LCC)
Small Outline (SOIC)
e
e
b a
C
M
Commercial ( 40 C to 85 C)
§
§
b a
Military ( 55 C to 125 C)
§
§
S
6
7
Physical Dimensions inches (millimeters)
20 Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
20 Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
8
Physical Dimensions inches (millimeters) (Continued)
20 Lead Small Outline Integrated Circuit (S)
NS Package Number M20B
20 Lead Plastic Dual-In-Line Package (P)
NS Package Number N20B
9
Ý
Lit. 114821
Physical Dimensions inches (millimeters) (Continued)
20 Lead Ceramic Flatpak (F)
NS Package Number W20A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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