Datasheet

   
     
  
SCLS224B − DECEMBER 1982 − REVISED SEPTEMBER 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HC257 SN74HC257
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 50 100 150 125
A or B Any Y
4.5 V 10 20 30 25
t
pd
A or B
Any Y
6 V 9 17 25 21
ns
t
pd
2 V 50 100 150 125
ns
A/B Any Y
4.5 V 10 20 30 25
A/B
Any Y
6 V 9 17 25 21
2 V 75 150 225 190
t
en
G Any Y
4.5 V 15 30 45 38
ns
t
en
G
Any Y
6 V 13 26 38 32
ns
2 V 75 150 225 190
t
dis
G Any Y
4.5 V 15 30 45 38
ns
t
dis
G
Any Y
6 V 13 26 38 32
ns
2 V 28 60 90 75
t
t
Any Y
4.5 V 8 12 18 15
ns
t
t
Any Y
6 V 6 10 15 13
ns
switching characteristics over recommended operating free-air temperature range, C
L
= 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HC257 SN74HC257
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 75 150 245 190
A or B Any Y
4.5 V 15 30 45 38
t
pd
A or B
Any Y
6 V 13 26 38 32
ns
t
pd
2 V 75 150 245 190
ns
A/B Any Y
4.5 V 15 30 45 38
A/B
Any Y
6 V 13 26 38 32
2 V 100 200 300 250
t
en
G Any Y
4.5 V 24 40 60 50
ns
t
en
G
Any Y
6 V 18 34 51 43
ns
2 V 45 210 315 265
t
t
Any Y
4.5 V 17 42 63 53
ns
t
t
Any Y
6 V 13 36 53 45
ns