Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Comparator SOIC 20 No. of bits 8 A=B 4.5 V

SN54ALS688, SN74ALS688

8-BIT IDENTITY COMPARATORS

SDAS228A – JUNE 1982 – REVISED JANUARY 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• Compare Two 8-Bit Words

• Totem-Pole Outputs (P = Q)

• ′ALS688 Are Identical to ′ALS521

• Package Options Include Plastic

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

OUTPUT

DATA

P, Q

ENABLE

OUTPUT

P = Q

P = Q L L

P > Q LH

P < Q LH

XHH

GND

P = Q

SN54ALS688 ...J PACKAGE

SN74ALS688 ...DW OR N PACKAGE

(TOP VIEW)

3212019

910111213

SN54ALS688 . . . FK PACKAGE

(TOP VIEW)

P5 P = Q

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.

Summary of content (18 pages)

PAGE 1
SN54ALS688, SN74ALS688 8-BIT IDENTITY COMPARATORS SDAS228A – JUNE 1982 – REVISED JANUARY 1995 SN54ALS688 . . . J PACKAGE SN74ALS688 . . . DW OR N PACKAGE (TOP VIEW) G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND 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.
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SN54ALS688, SN74ALS688 8-BIT IDENTITY COMPARATORS SDAS228A – JUNE 1982 – REVISED JANUARY 1995 logic symbol† 1 G P0 P1 P2 P3 P4 P5 P6 P7 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 2 COMP G1 0 4 6 8 P 11 13 15 17 3 1P=Q 7 0 5 7 9 Q 12 14 16 18 7 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
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SN54ALS688, SN74ALS688 8-BIT IDENTITY COMPARATORS SDAS228A – JUNE 1982 – REVISED JANUARY 1995 logic diagram (positive logic) P7 Q7 P6 Q6 P5 Q5 P4 Q4 17 18 15 16 13 14 11 12 19 P3 Q3 P2 Q2 P1 Q1 P0 Q0 G 8 P=Q 9 6 7 4 5 2 3 1 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
SN54ALS688, SN74ALS688 8-BIT IDENTITY COMPARATORS SDAS228A – JUNE 1982 – REVISED JANUARY 1995 recommended operating conditions SN54ALS688 SN74ALS688 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IOH Low-level input voltage 0.7 0.8 High-level output current –1 – 2.
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SN54ALS688, SN74ALS688 8-BIT IDENTITY COMPARATORS SDAS228A – JUNE 1982 – REVISED JANUARY 1995 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 VCC S1 RL R1 Test Point From Output Under Test CL (see Note A) From Output Under Test RL Test Point From Output Under Test CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 3.5 V Timing Input Test Point LOAD CIRCUIT FOR 3-STATE OUTPUTS 3.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant SN74ALS688DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1 SN74ALS688NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN74ALS688DWR SOIC DW 20 2000 367.0 367.0 45.0 SN74ALS688NSR SO NS 20 2000 367.0 367.0 45.
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