Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These identity comparators perform comparisons
on two 8-bit binary or BCD words and provide
P = Q
outputs. These devices have totem-pole
outputs.
The SN54ALS688 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS688 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
DATA
ENABLE
P, Q
P = QLL
P > QLH
P < QLH
XHH
G
P = Q
SN54ALS688 ...J PACKAGE
SN74ALS688 ...DW OR N PACKAGE
SN54ALS688 . . . 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
(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
Q7
P7
Q6
P6
Q5
P5
Q4
P4
18
17
16
15
14
P5P = 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1995, Texas Instruments Incorporated
1
SN54ALS688, SN74ALS688
8-BIT IDENTITY COMPARATORS
SDAS228A – JUNE 1982 – REVISED JANUAR Y 1995
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
G1
0
7
0
7
COMP
P
1P=Q
Q
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
1
G
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
19
P = Q
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram (positive logic)
17
P7
18
Q7
15
P6
16
Q6
13
P5
14
Q5
11
P4
12
Q4
8
P3
SN54ALS688, SN74ALS688
8-BIT IDENTITY COMPARATORS
SDAS228A – JUNE 1982 – REVISED JANUARY 1995
19
P = Q
9
Q3
6
P2
7
Q2
4
P1
5
Q1
2
P0
3
Q0
1
G
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
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.
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
FROM
INPUT
TO
OUTPUT
=
=
=
RL = 500 Ω
TA = MIN to MAX
SN54ALS688 SN74ALS688
MINMAXMINMAX
316312
525520
316312
525520
315312
525522
,
§
UNIT
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
From Output
Under Test
(see Note A)
SN54ALS688, SN74ALS688
8-BIT IDENTITY COMPARATORS
SDAS228A – JUNE 1982 – REVISED JANUARY 1995
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7 V
V
CC
S1
R
L
Test
Point
C
L
R
L
From Output
Under Test
C
(see Note A)
Test
Point
L
From Output
Under Test
(see Note A)
R1
C
L
RL = R1 = R2
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
1.3 V1.3 V
1.3 V1.3 V
FOR OPEN-COLLECTOR OUTPUTS
h
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
Low-Level
Out-of-Phase
(see Note C)
Pulse
Pulse
Input
In-Phase
Output
Output
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
1.3 V1.3 V
t
w
1.3 V1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
1.3 V1.3 V
t
PLH
t
PHL
1.3 V1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V1.3 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.
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(RoHS)
(RoHS)
(2)
Lead/Ball Finish MSL Peak Temp
CU NIPDAULevel-1-260C-UNLIM
CU NIPDAULevel-1-260C-UNLIM
CU NIPDAULevel-1-260C-UNLIM
CU NIPDAULevel-1-260C-UNLIM
CU NIPDAULevel-NC-NC-NC
CU NIPDAULevel-NC-NC-NC
CU NIPDAULevel-1-260C-UNLIM
CU NIPDAULevel-1-260C-UNLIM
(3)
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
26-Sep-2005
Addendum-Page 2
MECHANICAL DATA
MLCC006B – OCTOBER 1996
FK (S-CQCC-N**) LEADLESS CERAMIC CHIP CARRIER
28 TERMINAL SHOWN
A SQ
B SQ
20
22
23
24
25
19
21
1282627
12
131415161817
0.020 (0,51)
0.010 (0,25)
MIN
0.342
(8,69)
0.442
0.640
0.739
0.938
1.141
A
0.358
(9,09)
0.458
(11,63)
0.660
(16,76)
0.761
(19,32)(18,78)
0.962
(24,43)
1.165
(29,59)
NO. OF
TERMINALS
**
11
10
9
8
7
6
5
432
20
28
44
52
68
84
0.020 (0,51)
0.010 (0,25)
(11,23)
(16,26)
(23,83)
(28,99)
MINMAX
0.307
(7,80)
0.406
(10,31)
0.495
(12,58)
0.495
(12,58)
0.850
(21,6)
1.047
(26,6)
0.080 (2,03)
0.064 (1,63)
B
MAX
0.358
(9,09)
0.458
(11,63)
0.560
(14,22)
0.560
(14,22)
0.858
(21,8)
1.063
(27,0)
0.055 (1,40)
0.045 (1,14)
0.028 (0,71)
0.022 (0,54)
0.050 (1,27)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a metal lid.
D. The terminals are gold plated.
E. Falls within JEDEC MS-004
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
0.045 (1,14)
0.035 (0,89)
0.045 (1,14)
0.035 (0,89)
4040140/D 10/96
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