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参数资料
| 型号： | SN74AC74DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 锁存器 |
| 英文描述： | AC SERIES, DUAL POSITIVE EDGE TRIGGERED D FLIP-FLOP, COMPLEMENTARY OUTPUT, PDSO14 |
| 封装： | GREEN, PLASTIC, SOIC-14 |
| 文件页数： | 17/21页 |
| 文件大小： | 820K |
| 代理商： | SN74AC74DR |
SN54AC74, SN74AC74
DUAL POSITIVEEDGETRIGGERED DTYPE FLIPFLOPS
WITH CLEAR AND PRESET
SCAS521F AUGUST 1995 REVISED OCTOBER 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range,
VCC = 5 V"0.5 V (unless otherwise noted) (see Figure 1)
TA = 25°C
SN54AC74
SN74AC74
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fclock
Clock frequency
140
95
125
MHz
tw
Pulse duration
PRE or CLR low
4.5
5.5
5
ns
tw
Pulse duration
CLK
4.5
5.5
5
ns
tsu
Setup time, data before CLK
↑
Data
3
4
3
ns
tsu
Setup time, data before CLK
↑
PRE or CLR inactive
0
0.5
0
ns
th
Hold time, data after CLK
↑
0.5
ns
switching characteristics over recommended operating free-air temperature range,
VCC = 3.3 V " 0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25°C
SN54AC74
SN74AC74
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
fmax
100
125
70
95
MHz
tPLH
PRE or CLR
Q or Q
3.5
8
12
1
13
2.5
13
ns
tPHL
PRE or CLR
Q or Q
4
10.5
12
1
14
3.5
13.5
ns
tPLH
CLK
Q or Q
4.5
8
13.5
1
17.5
4
16
ns
tPHL
CLK
Q or Q
3.5
8
14
1
13.5
3.5
14.5
ns
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V " 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25°C
SN54AC74
SN74AC74
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
fmax
140
160
95
125
MHz
tPLH
PRE or CLR
Q or Q
2.5
6
9
1
9.5
2
10
ns
tPHL
PRE or CLR
Q or Q
3
8
9.5
1
10.5
2.5
10.5
ns
tPLH
CLK
Q or Q
3.5
6
10
1
12
3
10.5
ns
tPHL
CLK
Q or Q
2.5
6
10
1
10
2.5
10.5
ns
operating characteristics, VCC = 3.3 V, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
CL = 50 pF,
f = 1 MHz
45
pF
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