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参数资料
| 型号： | SN54LS490FK |
| 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, LCC-20 |
| 文件页数： | 7/9页 |
| 文件大小： | 147K |
| 代理商： | SN54LS490FK |
SN54LS490, SN74LS490
DUAL 4-BIT DECADE COUNTERS
SDLS125A – OCTOBER 1976 – REVISED JULY 1998
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SET9
1.3 V
CLR
CLK
QA
QD
QC
QB
1.3 V
tsu
tw(clock)
3 V
0 V
3 V
0 V
3 V
0 V
VOH
VOL
VOH
VOL
VOH
VOL
tPLH
(Measure at
tn + 1)
tPLH
tPHL
(Measure at
tn + 2)
tPHL
tPLH
(Measure at
tn + 2)
tPHL
(Measure at
tn + 4)
tPHL
tPLH
(Measure at
tn + 4)
tPLH
(Measure at
tn + 8)
tPLH
tPHL
(Measure at
tn + 8)
tPHL
(Measure at
tn + 10)
NOTE A: Input pulses are supplied by a generator having the following characteristics: tr ≤ 15 ns, tf ≤ 6 ns, PRR ≤ 1 MHz, duty cycle = 50%,
ZO ≈ 50 .
VOH
VOL
Figure 1. Voltage Waveforms
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