SN54LVC74A, SN74LVC74A
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
www.ti.com
SCAS287S–JANUARY 1993–REVISED MAY 2005
Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1)
SN74LVC74A
VCC = 1.8 V
± 0.15 V
VCC = 2.5 V
± 0.2 V
VCC = 3.3 V
± 0.3 V
VCC = 2.7 V
UNIT
MIN
MAX
83
MIN
MAX
83
MIN
MAX
83
MIN
MAX
150
fclock
tw
Clock frequency
Pulse duration
MHz
ns
PRE or CLR low
CLK high or low
Data
4.1
4.1
3.6
2.7
1
3.3
3.3
2.3
1.9
1
3.3
3.3
3.4
2.2
1
3.3
3.3
3
tsu
th
Setup time before CLK↑
ns
ns
PRE or CLR inactive
2
Hold time, data after CLK↑
0
Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1)
SN54LVC74A
VCC = 3.3 V
± 0.3 V
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
VCC = 2.7 V
UNIT
MIN
MAX
MIN
MAX
fmax
tpd
83
100
1
MHz
ns
CLK
6
5.2
5.4
Q or Q
PRE or CLR
6.4
1
Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1)
SN74LVC74A
FROM
(INPUT)
TO
(OUTPUT)
VCC = 1.8 V
± 0.15 V
VCC = 2.5 V
± 0.2 V
VCC = 3.3 V
± 0.3 V
PARAMETER
VCC = 2.7 V
UNIT
MIN
83
1
MAX
MIN
83
1
MAX
MIN
83
1
MAX
MIN
150
1
MAX
fmax
tpd
MHz
ns
CLK
7.1
6.9
4.4
4.6
6
5.2
5.4
1
Q or Q
PRE or CLR
1
1
1
6.4
1
tsk(o)
ns
Operating Characteristics
TA = 25°C
VCC = 1.8 V
TYP
VCC = 2.5 V
TYP
VCC = 3.3 V
TYP
TEST
CONDITIONS
PARAMETER
UNIT
Cpd
Power dissipation capacitance per flip-flop
f = 10 MHz
24
24
26
pF
5