參數(shù)資料
型號(hào)： UPD4990AC-A
元件分類(lèi)： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP14
封裝： DIP-14
文件頁(yè)數(shù)： 27/51頁(yè)
文件大?。?/td> 211K
代理商： UPD4990AC-A
28
CHAPTER 5 INTERFACE
(2) Using positive regulator with system reset
Application circuit is shown Fig. 5-2.
This application circuit is consist of system reset circuit (as power fail circuit). So this circuit will be better cost
performance than Fig. 5-1.
Fig. 5-2 Application Circuit No. 2
(3) Application for constant supply voltage
The circuits of Fig. 5-1 and Fig. 5-2 aren’t constant supply voltage. When system is active, supply voltage
of
PD4990A is 5 V. But when system is down (back up), supply voltage of PD4990A is 2-5 V. Fig. 5-3 will
be less time error than Fig. 5-1 and Fig. 5-2. But level shifters are necessary.
5.5 V ~
3.6 V
VDD
C0
3
14
C1
2
C2
1
OE
11
DIN
6
CLK
8
STB
4
10 k
XTAL
13
XTAL
12
CG = 20 pF
CD = 5 ~ 30 pF
32.768 kHz
DOUT
9
TP
10
+5 V
10 k
VSS
7
Positive regulator with system reset
PC2253H or 2255H
PD4990A
GND
RST
CS
RC
5
Ni-Cd
IO
Back up power supply
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