SN54F521, SN74F521

8-BIT IDENTITY COMPARATORS

SDFS091 – MARCH 1987 – REVISED OCTOBER 1993

2–4

POST OFFICE BOX 655303

switching characteristics (see Note 3)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

CL = 50 pF,

RL = 500 Ω,

TA = 25°C

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

RL = 500 Ω,

TA = MIN to MAX†

UNIT

(INPUT)

(OUTPUT)

′F521

SN54F521

SN74F521

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

PorQ

PQ

2.7

6.6

10

2.7

14

2.7

11

ns

tPHL

P or Q

P = Q

3.7

6.6

10

3.2

12

3.2

11

ns

tPLH

OE

P=Q

2.2

4.6

6.5

2.2

8.5

2.2

7.5

ns

tPHL

OE

P = Q

2.7

6.1

9

2.7

13.5

2.7

10

ns

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

NOTE 3: Load circuits and waveforms are shown in Section 1.