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参数资料
| 型号： | SNJ54LS490FKR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 计数器 |
| 英文描述： | LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CQCC20 |
| 封装： | CERAMIC, QCC-20 |
| 文件页数： | 6/9页 |
| 文件大小： | 147K |
| 代理商： | SNJ54LS490FKR |
SN54LS490, SN74LS490
DUAL 4-BIT DECADE COUNTERS
SDLS125A – OCTOBER 1976 – REVISED JULY 1998
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74LS490
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIH
High-level input voltage
2
V
VIL
Low-level input voltage
0.7
0.8
V
VIK
Input clamp voltage
VCC = MIN,
II = –18 mA
–1.5
V
VOH
High-level output voltage
VCC = MIN, VIH = 2 V,
VIL = VILmax
2.5
3.4
2.7
3.4
V
VOL
Low level output voltage
VCC = MIN,
VIH 2V
IOL = 4 mA
0.25
0.4
0.25
0.4
V
VOL
Low-level output voltage
VIH = 2 V,
VIL = VILmax
IOL = 8 mA
0.35
0.5
V
II
Input current
at maximum
CLR, SET9
VCC = MAX,
VI = 7 V
0.1
mA
II
at maximum
input voltage
CLK
VCC = MAX,
VI = 5.5 V
0.2
mA
IIH
High-level
CLR, SET9
VCC = MAX
VI =2 7V
20
A
IIH
g
input current
CLK
VCC = MAX,
VI = 2.7 V
100
A
IIL
Low-level
CLR, SET9
VCC = MAX
VI =0 4V
–0.4
mA
IIL
input current
CLK
VCC = MAX,
VI = 0.4 V
–1.6
mA
IOS§
Short-circuit output current
VCC = MAX
–20
–100
–20
–100
mA
ICC
Supply current
VCC = MAX,
See Note 3
15
26
15
26
mA
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values are at VCC = 5 V, TA = 25°C.
§ Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second.
NOTE 3: ICC is measured with all outputs open, both CLR inputs grounded following momentary connection to 4.5 V, and all other inputs
grounded.
switching characteristics, VCC = 5 V, TA = 25°C (see Figures 1 and 2)
PARAMETER
FROM
TO
TEST CONDITIONS
MIN
TYP
MAX
UNIT
PARAMETER
(INPUT)
(OUTPUT)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
fmax
CLK
QA
CL = 15 pF,
RL = 2 k
25
35
MHz
tPLH
CLK
QA
CL =15 pF
RL =2k
12
20
ns
tPHL
CLK
QA
CL = 15 pF,
RL = 2 k
13
20
ns
tPLH
CLK
QB QD
CL =15 pF
RL =2k
24
39
ns
tPHL
CLK
QB, QD
CL = 15 pF,
RL = 2 k
26
39
ns
tPLH
CLK
QC
CL =15 pF
RL =2k
32
54
ns
tPHL
CLK
QC
CL = 15 pF,
RL = 2 k
36
54
ns
tPHL
CLR
Any
CL = 15 pF,
RL = 2 k
24
39
ns
tPLH
SET9
QA, QD
CL =15 pF
RL =2k
24
39
ns
tPHL
SET9
QB, QC
CL = 15 pF,
RL = 2 k
20
36
ns
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