Datasheet

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   
      
SCHS275E − MARCH 2002 − REVISED OCTOBER 2003
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
’HCT191
timing requirements over recommended operating free-air temperature range V
CC
= 4.5 V (unless
otherwise noted) (see Figure 5)
T
A
= 25°C
T
A
= −55°C
TO 125°C
T
A
= −40°C
TO 85°C
UNIT
MIN MAX MIN MAX MIN MAX
UNIT
f
clock
Clock frequency 30 20 25 MHz
t
w
Pulse duration
LOAD low 16 24 20
ns
t
w
Pulse duration
CLK high or low
20 30 25
ns
Data before LOAD↑ 12 18 15
t
su
Setup time
CTEN
before CLK↑ 12 18 15
ns
t
su
Setup time
D/U before CLK↑ 18 27 23
ns
Data before LOAD↑ 2 2 2
t
h
Hold time
CTEN
before CLK↑ 2 2 2
ns
t
h
Hold time
D/U before CLK↑ 0 0 0
ns
t
rec
Recovery time LOAD inactive before CLK↑ 12 18 15 ns
’HCT191
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figure 5)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
V
CC
T
A
= 25°C
T
A
= −55°C
TO 125°C
T
A
= −40°C
TO 85°C
UNIT
PARAMETER
(INPUT)
(OUTPUT)
CAPACITANCE
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
f
max
4.5 V 30 20 25 MHz
LOAD
Q
C
L
= 50 pF 4.5 V 40 60 50
LOAD
Q
C
L
= 15 pF 5 V 17
A, B, C,
Q
C
L
= 50 pF 4.5 V 38 57 48
A, B, C,
or D
Q
C
L
= 15 pF 5 V 16
CLK
RCO
C
L
= 50 pF 4.5 V 35 53 44
CLK
RCO
C
L
= 15 pF 5 V 14
CLK
Q
C
L
= 50 pF 4.5 V 27 41 34
t
pd
CLK Q
C
L
= 15 pF 5 V 11
ns
t
pd
CLK
MAX/MIN
C
L
= 50 pF 4.5 V 42 63 53
ns
CLK MAX/MIN
C
L
= 15 pF 5 V 18
D/U
RCO
C
L
= 50 pF 4.5 V 30 45 38
D/U RCO
C
L
= 15 pF 5 V 12
D/U
MAX/MIN
C
L
= 50 pF 4.5 V 38 57 48
D/U
MAX/MIN
C
L
= 15 pF 5 V 16
CTEN
RCO
C
L
= 50 pF 4.5 V 27 41 34
CTEN RCO
C
L
= 15 pF 5 V 11
t
t
Any C
L
= 50 pF 4.5 V 15 22 19 ns