參數(shù)資料
型號: SN74F161
廠商: Texas Instruments, Inc.
元件分類: 通用總線功能
英文描述: SYNCHRONOUS 4-BIT BINARY COUNTER
中文描述: 同步4位二進(jìn)制計(jì)數(shù)器
文件頁數(shù): 7/9頁
文件大?。?/td> 124K
代理商: SN74F161
SN74F161A
SYNCHRONOUS 4-BIT BINARY COUNTER
SDFS056A – 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
MIN
MAX
UNIT
MAX
fclock
Clock frequency
0
100
0
90
MHz
CLK high or low (loading)
5
5
tw
Pulse duration
CLK (counting)
High
4
4
ns
Low
6
7
CLR low
Data before CLK
5
5
High or low
5
5
LOAD before CLK
High
11
11.5
tsu
Setup time
Low
8.5
9.5
ns
ENP and ENT before CLK
High
11
11.5
Low
5
5
Data after CLK
High or low
2
2
th
Hold time
LOAD after CLK
High
2
2
ns
Low
0
0
ENP and ENT after CLK
High or low
0
0
tsu
Inactive-state state setup time is also referred to as recovery time.
Inactive-state setup time, CLR high before CLK
6
6
ns
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500
,
TA = 25
°
C
MIN
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
,
TA = MIN to MAX
MIN
UNIT
TYP
MAX
MAX
fmax
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
100
120
90
MHz
CLK (LOAD high)
Any Q
2.7
5.1
7.5
2.7
8.5
ns
2.7
10
2.7
11
CLK (LOAD low)
Any Q
3.2
5.6
8.5
3.2
9.5
ns
3.2
5.6
8.5
3.2
9.5
CLK
RCO
4.2
9.6
14
4.2
15
ns
4.2
9.6
14
4.2
15
ENT
RCO
1.7
4.1
7.5
1.7
8.5
ns
1.7
4.1
7.5
1.7
8.5
tPHL
CLR
Any Q
4.7
8.6
12
4.7
13
ns
RCO
3.7
7.6
10.5
3.7
11.5
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
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