Datasheet

 
     
  
SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003
4
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 SN54HCT257 SN74HCT257
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
A or B
Y
4.5 V 20 30 45 38
t
pd
A or B Y
5.5 V 17 27 40 34
ns
t
pd
A/B
Y
4.5 V 20 30 45 38
ns
A/B
Y
5.5 V 17 27 40 34
t
en
OE
Y
4.5 V 20 30 45 38
ns
t
en
OE
Y
5.5 V 17 27 40 34
ns
t
dis
OE
Y
4.5 V 20 30 45 38
ns
t
dis
OE
Y
5.5 V 17 27 40 34
ns
t
t
Any
4.5 V 8 15 22 19
ns
t
t
Any
5.5 V 7 14 21 17
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 SN54HCT257 SN74HCT257
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
A or B
Y
4.5 V 22 38 57 48
t
pd
A or B Y
5.5 V 19 35 53 44
ns
t
pd
A/B
Y
4.5 V 22 38 57 48
ns
A/B
Y
5.5 V 19 35 53 44
t
en
OE
Y
4.5 V 23 40 60 50
ns
t
en
OE
Y
5.5 V 20 38 57 48
ns
t
t
Any
4.5 V 17 42 63 53
ns
t
t
Any
5.5 V 14 38 57 48
ns
operating characteristics, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance No load 13 pF
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