Datasheet

   
  
  
SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics V
CC
= 5 V, R
L
= 2 kΩ, T
A
= 25_C (see Figures 1 and 2)
PARAMETER
FROM
TO
TEST CONDITIONS
SN54LS221 SN74LS221
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
TEST CONDITIONS
MIN TYP MAX MIN TYP MAX
UNIT
t
PLH
A
Q
45 70 45 70
t
PLH
B
Q
C
ext
= 80 pF,
R
ext
= 2 kΩ
35 55 35 55
ns
t
PHL
A
Q
C
ext
= 80 pF,
R
ext
= 2 k
Ω
50 80 50 80
ns
t
PHL
B
Q
40 65 40 65
t
PHL
CLR
Q
C
ext
= 80 pF,
R
ext
= 2 kΩ
35 55 35 55
ns
t
PLH
CLR
Q
C
ext
= 80 pF,
R
ext
= 2 k
Ω
44 65 44 65
ns
C
ext
= 80 pF, R
ext
= 2 kΩ
70 120 150 70 120 150
t
w
A or B
Q or Q
C
ext
= 0, R
ext
= 2 kΩ
20 47 70 20 47 70
ns
t
w
A or B
Q or Q
C
ext
= 100 pF, R
ext
= 10 kΩ
670 740 810 670 740 810
ns
C
ext
= 1 µF, R
ext
= 10 kΩ
6* 6.9 7.5* 6 6.9 7.5 ms
∗ On products compliant to MIL-PRF-38535, this parameter is not production tested.