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I
H DO
HSYNC
B LKO
(SYNC)
EQ
(SYNC)
VSYNC
(SYNC)
VD
BFO
ODD
FLD
WNO
LALT
Pin No.
Pin Symbol
1
BFO
HR
2
3
VR
4
LR
5
EXT
6
CLKI
7
CLKO
8
FLD
9
N. C.
1 0
N . C.
1 1
LALT
1 2
Vss1
1 3
SCOF
1 4
MODE
1 5
VINT
1 6
PSEL
1 7
COM P
1 8
Voo2
1 9
AIN
20
AOUT
Vss2
21
22
FSCI
23
FSCO
24
SC
25
WNDE
26
WND
TEST
27
28
Voo1
29
HDO
30
VDO
31
SYNC
BLKO
32
1
2
/
H
I
1 . 0 1
2
28 . 5 5
17 . 6 9
Fig. 2-1 5. H Direction Timing Chart
1/0
0
Burst flag pulse
I
Horizontal reset input
Vertical reset input
I
I
Line selection reset input
I
Internal
I
Clock input (NTSC : 1 4.31 81 8 MHz, PAL : 1 4. 1 875 M Hz)
0
Clock output
0
Field pulse
0
Line selection output (Line alternator pulse)
GND
I
Sub-carrier suppressed input L : OFF
I
NTSC
I
Initialisation input
I
Phase comparator polarity selection
0
Phase comparator output
Filter inverter +5 V
I
Filter inverter i nput
0
Filter inverter output
Filter inverter G N D
I
4 fsc clock input
0
4 fsc clock output
0
Sub-carrier output
I
Window output enable input (Enabled at "L")
0
Window output
I
Test input (normal "L")
+5 V
0
Horizontal drive pulse
0
Vertical drive pulse
Composite synchronous pulse
0
0
Composite blanking pulse
Table 2-4. IC915 Pin Functions
- 4 - 2 0 -
Pin Description
I
(iNI I
external
EXT) mode selection
I
PAL mode selection (NTSC
1 H
I
[ µ s ]
I
PAL)
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