參數(shù)資料
型號： UPD4990AC-A
元件分類： 時鐘/數(shù)據(jù)恢復(fù)及定時提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP14
封裝： DIP-14
文件頁數(shù)： 23/51頁
文件大?。?/td> 211K
代理商： UPD4990AC-A
– ii –
LIST OF FIGURES
Figure No.
Title
Page
1-1
52 bit Shift Register ................................................................................................................................... 4
1-2
Data INPUT/OUTPUT ................................................................................................................................ 5
1-3
Data Write Action ....................................................................................................................................... 5
1-4
Data Read Action ....................................................................................................................................... 5
2-1
Parallel Command Timing (C0, C1, C2) ..................................................................................................... 9
2-2
Serial Command timing (C0’, C1’, C2’, C3’) .............................................................................................. 10
3-1
Read Data Flow-chart .............................................................................................................................. 19
3-2
Read Data Timing-chart (Using C0, C1, C2) ............................................................................................ 20
3-3
Read Data Timing-chart (Using C0’, C1’, C2’, C3’) .................................................................................. 20
3-4
Write Data Flow-chart .............................................................................................................................. 21
3-5
Write Data Timing-chart (Using C2, C1, C0) ............................................................................................ 22
3-6
Write Data Timing-chart (Using C3,’ C2’, C1’, C0’) ................................................................................... 22
4-1
Crystal Oscillator ...................................................................................................................................... 23
4-2
Measurement Circuit of Oscillation Characteristics ............................................................................... 23
4-3
Temperature Characteristics .................................................................................................................... 24
4-4
Temperature Characteristics (Only
PD4990A) ..................................................................................... 24
4-5
Measurement Circuit ................................................................................................................................ 25
4-6
Supply Current Characteristics ............................................................................................................... 26
5-1
Application Circuit No. 1 .......................................................................................................................... 27
5-2
Application Circuit No. 2 .......................................................................................................................... 28
5-3 (a)
Application Circuit (Using 74LS07) ......................................................................................................... 29
5-3 (b)
Application Circuit (Using 74HC4050) .................................................................................................... 29
5-4
Power Fail Circuit ..................................................................................................................................... 30
5-5
Faulty Example ........................................................................................................................................ 30
5-6
Characteristics of Fig. 5-5 ....................................................................................................................... 31
6-1
Application Circuit for
COM-75X ........................................................................................................... 33
6-2
Application Circuit for
COM-87AD ........................................................................................................ 37
6-3
Application Circuit (Back Up Power Supply) .......................................................................................... 40
7-1
Oscillator of
PD4990A and PD1990A ................................................................................................. 44
7-2
Oscillation Wave of
PD4990A and PD1990A ..................................................................................... 44
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