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SN74F168 Datasheet, PDF (7/9 Pages) Texas Instruments – SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTER | |||
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SN74F168
SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTER
SDFS057A â D2932, MARCH 1987 â REVISED OCTOBER 1993
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
fclock
tw
Clock frequency
Pulse duration
tsu
Setup time
th
Hold time
CLK high or low
Data before CLKâ
LOAD before CLKâ
ENP and ENT before CLKâ
U/D before CLKâ
Data after CLKâ
LOAD after CLKâ
ENP and ENT after CLKâ
U/D after CLKâ
High or low
High or low
High or low
High
Low
High or low
High or low
High or low
High or low
VCC = 5 V,
TA = 25°C
MIN MAX
0 100
5
4
8
5
11
16.5
3
0
0
0
MIN MAX UNIT
0
90 MHz
5.5
ns
4.5
9
6
ns
12.5
18
3.5
0
ns
0
0
switching characteristics (see Note 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500 â¦,
TA = 25°C
MIN TYP MAX
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL= 500 â¦,
TA = MIN to MAXâ
MIN
MAX
fmax
100 115
90
tPLH
CLK
tPHL
2.2 6.1 8.5
2.2
9.5
Q
3.2 8.6 11.5
3.2
13
tPLH
CLK
tPHL
RCO
4.7 11.6 15.5
4.7
17
3.2 8.1
11
3.2
12.5
tPLH
tPHL
ENT
RCO
1.7 4.1
6
1.7
7
1.7 5.6
8
1.7
9
tPLH
U/D
tPHL
RCO
2.7 8.1
11
2.7
12.5
3.2 12.1
16
3.2
17.5
â For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 3: Load circuits and waveforms are shown in Section 1.
UNIT
MHz
ns
ns
ns
ns
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
2â7
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