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SDA5275P データシート(Datasheet) 20 Page - Siemens Semiconductor Group

部品番号. SDA5275P
部品情報  ICs for Consumer Electronics MEGATEXT and MEGATEXT PLUS ICs
ダウンロード  30 Pages
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メーカー  SIEMENS [Siemens Semiconductor Group]
ホームページ  http://www.siemens.com/
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 20 page
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SDA 5273 / 75
SDA 5273-2 / 75-2
Semiconductor Group
20
1997-09-01
Characteristics (cont’d)
T
A = 0 to 70 °C
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
max.
Reset/Chip Initialization
A power-on reset or a reset pulse at pin RES lead to a hardware reset and a software initialization
of registers and internal DRAM. During initialization bus transfers are not allowed.
At / after power-on a reset pulse at pin RES is necessary. RES may return to 0 after the supply
voltage reached its lower limit for chip function (4.7 V). This may be achieved by a capacitor
C
between RES and
V
DD and by a resistor R between RES and VSS. The dimensions of R and C
depend on the worst case rise time of
V
DD.
Initialization time after power-
on or falling edge of RES
t
INIT
25
ms
V
DD greater 4.7 V
If the supply voltage drops below
V
DD min, the IC has to be reset by pin RES.
Pulse width RES
100
ns
High level at pin RES causes chip reset.
In rare cases, the IC may remain in a permanent reset state after power up, depending on the
applicational context. After power up, the software should check proper operation. In case the
Megatext does not react properly, power supply should be switched off for at least 3 s. After that,
power supply can be switched on again.
Other Items
Horizontal frequency pull-in
range of CVBS-PLL:
15
15.625 16.2
kHz
PAL
20.48 MHz crystal
15.2
15.748 16.3
kHz
NTSC
20.48 MHz crystal
Horizontal frequency pull-in
range of display-PLL:
15
15.625 16.2
kHz
20.48 MHz crystal




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