Datasheet

SN54AHC74, SN74AHC74
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SCLS255J − DECEMBER 1995 − REVISED JULY 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO LOAD
T
A
= 25°C SN54AHC74 SN74AHC74
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
f
C
L
= 15 pF 80* 125* 70* 70
MHz
f
max
C
L
= 50 pF 50 75 45 45
MHz
t
PLH
PRE or CLR
QorQ
C 15 pF
7.6* 12.3* 1* 14.5* 1 14.5
ns
t
PHL
PRE or CLR Q or Q
C
L
= 15 pF
7.6* 12.3* 1* 14.5* 1 14.5
ns
t
PLH
CLK
QQ
C 15 pF
6.7* 11.9* 1* 14* 1 14
ns
t
PHL
CLK
Q or Q
C
L
= 15 pF
6.7* 11.9* 1* 14* 1 14
ns
t
PLH
PRE CLR
QQ
C 50 pF
10.1 15.8 1 18 1 18
ns
t
PHL
PRE or CLR Q or Q
C
L
= 50 pF
10.1 15.8 1 18 1 18
ns
t
PLH
CLK
QorQ
C =50pF
9.2 15.4 1 17.5 1 17.5
ns
t
PHL
CLK
Q or Q
C
L
= 50 pF
9.2 15.4 1 17.5 1 17.5
ns
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO LOAD
T
A
= 25°C SN54AHC74 SN74AHC74
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
f
C
L
= 15 pF 130* 170* 110* 110
MHz
f
max
C
L
= 50 pF 90 115 75 75
MHz
t
PLH
PRE CLR
QQ
C 15 pF
4.8* 7.7* 1* 9* 1 9
ns
t
PHL
PRE or CLR Q or Q
C
L
= 15 pF
4.8* 7.7* 1* 9* 1 9
ns
t
PLH
CLK
QorQ
C 15 pF
4.6* 7.3* 1* 8.5* 1 8.5
ns
t
PHL
CLK
Q or Q
C
L
= 15 pF
4.6* 7.3* 1* 8.5* 1 8.5
ns
t
PLH
PRE CLR
QQ
C 50 pF
6.3 9.7 1 11 1 11
ns
t
PHL
PRE or CLR Q or Q
C
L
= 50 pF
6.3 9.7 1 11 1 11
ns
t
PLH
CLK
QorQ
C =50pF
6.1 9.3 1 10.5 1 10.5
ns
t
PHL
CLK Q or Q C
L
= 50 pF
6.1 9.3 1 10.5 1 10.5
ns
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
noise characteristics, V
CC
= 5 V, C
L
= 50 pF, T
A
= 25°C (see Note 5)
PARAMETER
SN74AHC74
UNIT
PARAMETER
MIN MAX
UNIT
V
OL(P)
Quiet output, maximum dynamic V
OL
0.8 V
V
OL(V)
Quiet output, minimum dynamic V
OL
−0.8 V
V
OH(V)
Quiet output, minimum dynamic V
OH
4.7 V
V
IH(D)
High-level dynamic input voltage 3.5 V
V
IL(D)
Low-level dynamic input voltage 1.5 V
NOTE 5: Characteristics are for surface-mount packages only.
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance No load, f = 1 MHz 32 pF