SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521

8-BIT IDENTITY COMPARATORS

SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995

6

POST OFFICE BOX 655303

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

TA = MIN to MAX†

UNIT

(INPUT)

(OUTPUT)

SN74ALS518

MIN

MAX

tPLH

PorQ

PQ

15

33

ns

tPHL

P or Q

P = Q

3

15

ns

tPLH

G

P=Q

15

33

ns

tPHL

G

P = Q

3

15

ns

† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . .

All other inputs

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 55

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74ALS520, SN74ALS521

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . .

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

SN54ALS520

SN74ALS520

SN74ALS521

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.7

0.8

V

IOH

High-level output current

–1

– 2.6

mA

IOL

Low-level output current

12

24

mA

TA

Operating free-air temperature

–55

125

0

70

°C