SN74S225

16

× 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY

WITH 3-STATE OUTPUTS

SDLS207B – SEPTEMBER 1976 – REVISED APRIL 1998

6

POST OFFICE BOX 655303

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

CLKA

10

20

fmax

CLKB

CL = 30 pF

10

20

MHz

UNCK IN

10

20

tw

UNCK OUT

CL = 30 pF

7

14

ns

tdis

OE

Any Q

CL = 5 pF

10

25

ns

ten

OE

Any Q

CL = 30 pF

25

40

ns

tPLH

UNCK IN

Any Q

CL =30 pF

50

75

ns

tPHL

UNCK IN

Any Q

CL = 30 pF

50

75

ns

tPLH

CLKA or CLKB

OR

CL = 30 pF

190

300

ns

tPLH

UNCK IN

OR

CL =30 pF

40

60

ns

tPHL

UNCK IN

OR

CL = 30 pF

30

45

ns

CLR

OR

35

60

tPHL

CLKA or CLKB

UNCK OUT

CL =30 pF

25

45

ns

tPHL

UNCK IN

UNCK OUT

CL = 30 pF

270

400

ns

CLKA or CLKB

IR

55

75

UNCK IN

IR

255

400

tPLH

CLR

IR

CL = 30 pF

16

35

ns

OR

↑

Any Q

10

20

† All typical values are at VCC = 5 V, TA = 25°C.