Texas Instruments SN54ALS520J, SN74ALS518DW, SN74ALS518N, SN74ALS520DW, SN74ALS520DWR Datasheet
...
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
TYPE
PULLUP
AND
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
• Compare Two 8-Bit Words
• Choice of Totem-Pole or Open-Collector
Outputs
• SN74ALS518 and ′ALS520 Have 20-kΩ
Pullup Resistors on Q Inputs
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
INPUT
RESISTOR
SN74ALS518 Yes P = Q open collector
′ALS520 Yes P = Q totem pole
SN74ALS521
‡
SN74ALS521 is identical to ′ALS688.
‡
No P = Q totem pole
description
These identity comparators perform comparisons
on two 8-bit binary or BCD words. The
SN74ALS518 provides P = Q outputs, while the
′ALS520 and SN74ALS521 provide P = Q
outputs. The SN74ALS518 has an open-collector
output. The SN74ALS518 and ′ALS520 feature
20-kΩ pullup resistors on the Q inputs for analog
or switch data.
The SN54ALS520 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS518, SN74ALS520, and
SN74ALS521 are characterized for operation
from 0°C to 70°C.
OUTPUT FUNCTION
CONFIGURATION
SN54ALS520 ...J PACKAGE
SN74ALS518, SN74ALS520,
SN74ALS521 ...DW OR N PACKAGE
†
P = Q for SN74ALS518
P = Q
SN54ALS520 . . . FK PACKAGE
P1
Q1
P2
Q2
P3
(TOP VIEW)
G
1
P0
2
Q0
3
P1
4
Q1
5
P2
6
Q2
7
P3
8
9
Q3
GND
10
for ′ALS520 and SN74ALS521
(TOP VIEW)
Q0P0G
3212019
4
5
6
7
8
910111213
Q3
P4
20
19
18
17
16
15
14
13
12
11
V
CC
Q4
V
CC
P = Q/P = Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
18
17
16
15
14
P5 P = Q
Q7
P7
Q6
P6
Q5
GND
†
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
FUNCTION TABLE
INPUTS
DATA
ENABLE
P, Q
P = Q L H L
P > Q LLH
P < Q LLH
XHLH
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
G
OUTPUTS
P = Q
P = Q
Copyright 1995, Texas Instruments Incorporated
1
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
logic symbols
1
G
2
P0
4
P1
6
P2
8
P3
11
P4
13
P5
15
P6
17
P7
3
Q0
5
Q1
7
Q2
9
Q3
12
Q4
14
Q5
16
Q6
18
Q7
†
SN74ALS518
COMP
G1
0
P
7
0
Q
7
1P=Q
19
P = Q
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
′ALS520
SN74ALS521
1
G
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
G1
0
7
0
7
COMP
P
Q
1P=Q
19
P = Q
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagrams (positive logic)
17
P7
18
Q7
15
P6
16
Q6
13
P5
14
Q5
11
P4
12
Q4
8
P3
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
SN74ALS518
19
P = Q
Q3
P2
Q2
P1
Q1
P0
Q0
9
6
7
4
5
2
3
1
G
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
logic diagrams (positive logic) (continued)
′ALS520
SN74ALS521
17
P7
18
Q7
15
P6
16
Q6
13
P5
14
Q5
11
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
12
19
8
9
6
7
4
5
2
3
1
G
P = Q
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
UNIT
PARAMETER
TEST CONDITIONS
UNIT
V
V
V
V
I
V
V
mA
I
V
V
V
I
V
V
V
mA
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
: Q inputs VCC + 0.5 V or 5.5 V, whichever is less. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
†
All other inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-state output voltage 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
: SN74ALS518 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN74ALS518
MIN NOM MAX
V
V
V
V
I
T
CC
IH
IL
OH
OL
A
Supply voltage 4.5 5 5.5 V
High-level input voltage 2 V
Low-level input voltage 0.8 V
High-level output voltage 5.5 V
Low-level output current 24 mA
Operating free-air temperature 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN74ALS518
MIN TYP‡MAX
V
IK
I
OH
OL
I
IH
IL
I
CC
‡
All typical values are at VCC = 5 V, TA = 25°C.
NOTE 1: ICC is measured with G
Q inputs
All other inputs
Q inputs
All other inputs
Q inputs
All other inputs
grounded, and P and Q at 4.5 V .
VCC = 4.5 V, II = –18 mA –1.5 V
VCC = 5.5 V, VOH = 5.5 V 0.1 mA
= 4.5
CC
= 5.5
CC
= 5.5 V,
CC
= 5.5 V,
CC
VCC = 5.5 V, See Note 1 11 17 mA
IOL = 12 mA 0.25 0.4
IOL = 24 mA 0.35 0.5
VI = 5.5 V 0.1
VI = 7 V 0.1
= 2.7
I
= 0.4
I
–0.2 mA
20 µA
–0.6
–0.1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
(
)
(
)
(INPUT)
(OUTPUT)
P
Q
P
Q
ns
G
P
Q
ns
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PLH
t
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
FROM
INPUT
or
TO
OUTPUT
=
=
RL = 680 Ω
TA = MIN to MAX
,
SN74ALS518
MIN MAX
15 33
3 15
15 33
3 15
†
UNIT
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
: Q inputs of ′ALS520 VCC + 0.5 V or 5.5 V, whichever is less. . . . . . . . . . . . . . . . . . . . . . . . .
I
All other inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
: SN54ALS520 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
SN74ALS520, SN74ALS521 0°C to 70°C. . . . . . . . . . . . . . . . . . . .
recommended operating conditions
SN74ALS520
SN74ALS521
UNIT
V
V
V
I
I
T
CC
IH
IL
OH
OL
A
SN54ALS520
MIN NOM MAX MIN NOM MAX
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.7 0.8 V
High-level output current –1 –2.6 mA
Low-level output current 12 24 mA
Operating free-air temperature –55 125 0 70 °C
‡
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
V
V
VOLV
4.5 V
V
I
V
V
mA
I
V
V
V
I
V
V
V
mA
I
V
See Note 1
mA
PARAMETER
UNIT
P
Q
P
Q
ns
G
P
Q
ns
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS
V
IK
V
OH
I
IH
IL
I
O
CC
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
NOTE 1: ICC is measured with G
′ALS520 Q inputs
All other inputs
′ALS520 Q inputs
All other inputs
′ALS520 Q inputs
All other inputs
‡
′ALS520
SN74ALS521
VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
VCC = 4.5 V to 5.5 V, IOH = – 0.4 mA VCC –2 VCC –2
= 4.5
CC
=
CC
= 5.5
CC
= 5.5 V,
CC
= 5.5 V,
CC
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
= 5.5 V,
CC
grounded, and P and Q at 4.5 V .
IOH = – 1 mA 2.4 3.3
IOH = – 2.6 mA 2.4 3.2
IOL = 12 mA 0.25 0.4 0.25 0.4
IOL = 24 mA 0.35 0.5
VI = 5.5 V 0.1 0.1
VI = 7 V 0.1 0.1
= 2.7
I
= 0.4
I
SN54ALS520
MIN TYP†MAX MIN TYP†MAX
–0.2 –0.2 mA
20 20 µA
–0.6 –0.6
–0.1 –0.1
12 19 12 19
12 19 12 19
SN74ALS520
SN74ALS521
UNIT
V
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
FROM
(INPUT) (OUTPUT)
t
PLH
t
PHL
t
PLH
t
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
or
TO
=
=
RL = 500 Ω
TA = MIN to MAX
SN54ALS520
MIN MAX MIN MAX
3 19 3 12
3 25 5 20
2 18 2 12
5 23 5 22
,
§
SN74ALS520
SN74ALS521
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
7
SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521
8-BIT IDENTITY COMPARATORS
SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
V
CC
R
L
From Output
Under Test
(see Note A)
C
L
Test
Point
R
L
From Output
Under Test
C
(see Note A)
Test
Point
L
From Output
Under Test
(see Note A)
7 V
RL = R1 = R2
S1
R1
C
L
Test
Point
R2
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
Timing
Input
t
su
Data
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
t
PZL
t
PZH
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
1.3 V
t
PHZ
1.3 V
1.3 V
t
h
1.3 V1.3 V
1.3 V1.3 V
FOR OPEN-COLLECTOR OUTPUTS
t
PLZ
LOAD CIRCUIT
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
[
3.5 V
V
OL
0.3 V
V
OH
0.3 V
[
0 V
High-Level
Pulse
Low-Level
Pulse
In-Phase
Out-of-Phase
(see Note C)
FOR 3-STATE OUTPUTS
1.3 V 1.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Output
Output
t
PLH
t
PHL
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
LOAD CIRCUIT
t
w
1.3 V1.3 V
1.3 V 1.3 V
t
PHL
t
PLH
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
V
V
V
V
OH
OL
OH
OL
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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