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SN74F168 Datasheet(PDF) 7 Page - Texas Instruments

Part # SN74F168
Description  SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN74F168 Datasheet(HTML) 7 Page - Texas Instruments

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


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