參數(shù)資料
型號: SN74AHCT161
廠商: Texas Instruments, Inc.
元件分類: 通用總線功能
英文描述: 4-Bit Synchronous Binary Counters(4位二進制同步計數(shù)器)
中文描述: 4位同步二進制計數(shù)器(4位二進制同步計數(shù)器)
文件頁數(shù): 8/10頁
文件大?。?/td> 224K
代理商: SN74AHCT161
SN54AHCT161, SN74AHCT161
4-BIT SYNCHRONOUS BINARY COUNTERS
SCLS368A – MAY 1997 – REVISED JUNE 1997
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V
±
0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
LOAD
SN74AHCT161
TA = 25
°
C
TYP
185
UNIT
(OUTPUT)
CAPACITANCE
MIN
MAX
MIN
MAX
135
fmax
CL = 15 pF
CL = 50 pF
115
MHz
125
95
85
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
CLK
Q
CL= 15 pF
CL = 15 pF
4.9
8.1
1
9.5
ns
4.9
8.1
1
9.5
CLK
RCO
CL= 15 pF
CL = 15 pF
4.9
8.1
1
9.5
ns
(count mode)
4.9
8.1
1
9.5
CLK
RCO
CL= 15 pF
CL = 15 pF
6.2
10.3
1
12
ns
(preset mode)
6.2
10.3
1
12
ENT
RCO
CL= 15 pF
CL = 15 pF
4.9
8.1
1
9.5
ns
4.9
8.1
1
9.5
tPHL
CLR
Q
CL= 15 pF
CL = 15 pF
5.5
9
1
10.5
ns
RCO
5
8.6
1
10
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
CLK
Q
CL= 50 pF
CL = 50 pF
6.4
10.1
1
11.5
ns
6.4
10.1
1
11.5
CLK
RCO
CL= 50 pF
CL = 50 pF
6.4
6.4
10.1
10.1
1
1
11.5
11.5
ns
(count mode)
CLK
RCO
CL= 50 pF
CL = 50 pF
7.7
7.7
12.3
12.3
1
1
14
14
ns
(preset mode)
ENT
RCO
CL= 50 pF
CL = 50 pF
6.4
10.1
1
11.5
ns
6.4
10.1
1
11.5
tPHL
CLR
Q
CL= 50 pF
CL = 50 pF
7
11
1
12.5
ns
RCO
6.5
10.6
1
12
noise characteristics, V
CC
= 5 V, C
L
= 50 pF, T
A
= 25
°
C (see Note 4)
PARAMETER
SN74AHCT161
UNIT
MIN
TYP
0.4
MAX
0.8
VOL(P)
VOL(V)
VOH(V)
VIH(D)
VIL(D)
NOTE 4: Characteristics are determined during product characterization and ensured by design for surface-mount packages only.
Quiet output, maximum dynamic VOL
Quiet output, minimum dynamic VOL
Quiet output, minimum dynamic VOH
High-level dynamic input voltage
V
–0.4
–0.8
V
V
2
V
Low-level dynamic input voltage
0.8
V
operating characteristics, V
CC
= 5 V, T
A
= 25
°
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load,
f = 1 MHz
23
pF
P
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