Datasheet
SCLS303D − JANUARY 1996 − REVISED AUGUST 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 SN54HC640 SN74HC640
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 29 105 160 130
t
pd
A or B B or A
4.5 V 10 21 32 26
ns
t
pd
A or B
B or A
6 V 8 18 27 22
ns
2 V 109 230 340 290
t
en
OE A or B
4.5 V 27 46 68 58
ns
t
en
OE
A or B
6 V 20 39 58 49
ns
2 V 40 150 225 190
t
dis
OE A or B
4.5 V 18 30 45 38
ns
t
dis
OE
A or B
6 V 16 26 38 32
ns
2 V 20 60 90 75
t
t
A or B
4.5 V 8 12 18 15
ns
t
t
A or B
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 SN54HC640 SN74HC640
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
2 V 44 190 290 235
t
pd
A or B B or A
4.5 V 14 38 58 47
ns
t
pd
A or B
B or A
6 V 11 33 49 41
ns
2 V 124 315 470 395
t
en
OE A or B
4.5 V 31 63 94 79
ns
t
en
OE
A or B
6 V 23 54 80 68
ns
2 V 45 210 315 265
t
t
A or B
4.5 V 17 42 63 53
ns
t
t
A or B
6 V 13 36 53 45
ns
operating characteristics, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance No load 40 pF