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參數(shù)資料
| 型號(hào)： | MC14490DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | OSCILLATOR 66.666MHZ SMD |
| 中文描述： | 4000/14000/40000 SERIES, 4-BIT RIGHT SERIAL IN SERIAL OUT SHIFT REGISTER, TRUE OUTPUT, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大?。?/td> | 265K |
| 代理商： | MC14490DW |
MOTOROLA CMOS LOGIC DATA
299
MC14490
Characteristic
Output Rise Time
Symbol
tTLH
Vdc
5.0
5.0
10
Min
—
—
—
Typ #
180
100
30
Max
360
200
60
Unit
ns
Output Fall Time
Oscillator Output
ns
Oscillator Input to Debounce Outputs
5.0
5.0
10
10
10
15
—
—
—
80
285
370
6
40
570
740
3.0
—
(External Clock)
Rise and Fall Time
Oscillator Input
Cext
≥
100 pF*
No Limit
1.5
Cext (in
μ
F)
Note: These equations are intended to be a design guide.
#Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.
15
*POWER–DOWN CONSIDERATIONS
Large values of Cext may cause problems when powering down the MC14490 because of the amount of energy stored in the
capacitor. When a system containing this device is powered down, the capacitor may discharge through the input protection
diodes at Pin 7 or the parasitic diodes at Pin 9. Current through these internal diodes must be limited to 10 mA, therefore the
turn–off time of the power supply must not be faster than t = (VDD – VSS) Cext/(10 mA). For example, If VDD – VSS = 15 V and
Cext = 1
μ
F, the power supply must turn off no faster than t = (15 V) (1
μ
F)/10 mA = 1.5 ms. This is usually not a problem
because power supplies are heavily filtered and cannot discharge at this rate.
When a more rapid decrease of the power supply to zero volts occurs, the MC14490 may sustain damage. To avoid this possi-
bility, use external clamping diodes, D1 and D2, connected as shown in Figure 2.
VDD
50%
Figure 1. Switching Waveforms
Figure 2. Discharge Protection During Power Down
OSCin
Aout
Aout
OSCin
Ain
0 V
VDD
0 V
VDD
0 V
90%
10%
50%
tr
tf
tPHL
90%
10%
50%
50%
tsu
50%
D1
D2
Cext
9
7
OSCin
OSCout
MC14490
tPLH
VDD
VDD
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| MC14490DWG | 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel |
| MC14490DWG | 制造商:ON Semiconductor 功能描述:Gate / Inverter Logic IC Package/Case:16 |
| MC14490DWR2 | 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel |
| MC14490DWR2G | 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel |
| MC14490F | 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel |
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