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PDF BU2871FS Data sheet ( Hoja de datos )
| Número de pieza | BU2871FS | |
| Descripción | (BU2871FS / BU2878FS) On-screen Display | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
On-screen display for VCRs
BU2878FS/BU2871FS
The BU2878FS and BU2871 FS are character generator ICs for pattern display use in VCRs and televisions. The IC circuit
is made upofavideo signal generator, analog switch, synchronization separator circuit, and synchronization signal detect
circuit. The display RAM can store is 10 linesX24 characters, and the on-chip character data ROM can store either 64
or 128 diff9rent characters.
•Applications
VCRs
•Features
1)10 line X 24 character display.
2)64 (BU2878FS) or 128 (BU2871FS) character types.
3)For each line, the character size can be selected as ei-
ther 1X or 2 X .
4)Characteroutputfor composite video is white with black
border.
5)Background color can be either white black or blue
(black or white with PAL systems).
6)Built-in synchronous separation circuit.
7)Built-in clamp circuit.
8)Built-in synchronous decision circuit.
9)Compatible With NTSC, PAL, PAL-M,and PAL-N. Non-
interlace mode can be selected.
• A b s o l u t e maximum ratings (Ta=25°C)
Parameter
Symbol
Limits
Power supply voltage
Vcc - 0 . 3 - 7 . 0
Power dissipation
Pd 7 5 0 *
Operating temperature
Topr
-20-75
Storage temperature
Tstg
-50-150
# Reduced by 6.0mW for each increase in T a of 1°C over 25"C.
• R e c o m m e n d e d operating conditions (Ta=25°C)
Parameter
Symbol Min. Typ.
Power supply voltage
Input voltage
Vdd 4 . 5 5 . 0
0VLN -
LC oscillator frequency
fosc
5.0
-
X'lal oscillator frequency 1 Xosc
-
2tsc
X'tal oscillator frequency 2 Xosc
-
4LSC
*1 For NTSC.
*2 For PAL, PAL-M, and PAL-N.
Max.
5.5
Vdd
10.0
-
-
Unit
V
mW
•e
°c
Unit
V
V
MHz
Hz
Hz
350 RDHm
Free Datasheet http://www.datasheet4u.com/
1 page  
Multimedia ICs
BU2878FS/BU2871 FS
• E l e c t r i c a l characteristics (Ta=-20°C to + 75'C a n d V D D = 4 . 5 V t o 5 . 5 V )
Parameter
"L" input voltage
"H" input voltage
"L" output voltage
"H" output voltage
"L" output voltage
"H" output voltage
Input pullup resistor
Operating current
Symbol
VlL2
VlH2
V0L1
V0H1
VOLZ
VOH2
lR
Idd
Min,
0
0.7Vdd
-
0.9Vdd
-
0.9Vdd
15
-
Typ,
-
-
-
-
-
-
30
10
Max.
0,3Vdd
Vdd
0.1 Vdd
-
0.1 Vdd
-
75
-
Unit
V
V
V
V
V
V
kO
MA
Conditions
For CMOS input
For CMOS input
For OSC *1
For OSC *1
LOLS2MA *2
Ioh£1 mA *2
Pullup input
*3
"1 When an external clock is connected to the oscillator pin (50% duty cycle).
"2 Only for CMOS output pins (1, 14, and 17).
*3 All characters displayed with tosc = 7MHz.
© N o t designed for radiation resistance.
Test Circuit
Fig. 3
Fig. 3
Fig. 1
Fig.2
Fig. 1
Fig.2
Fig.3
Fig. 4
354 RDHfTI
Free Datasheet http://www.datasheet4u.com/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BU2871FS.PDF ] | |
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