Ordering number :EN4846A
13096HA (OT)/N2894TH (OT) No. 4846-1/20
Overview
The LC74761 and LC74761M are on-screen display
CMOS LSIs that superimpose text and low-level graphics
onto a TV screen (video signal) under microcontroller.
The display characters have a 12 by 18 dots structure, and
256 characters are provided.
Features
Display structure: 12 lines by 24 characters (up to 288
characters)
Maximum character display: Up to 288 characters
Character configuration: 12 (W) by 18 (H) dots structure
Number of characters: 256 characters (254 plus space 1
font and transparent space 1 font)
Character sizes: Three sizes (normal, double, and triple
sizes)
Display starting positions: 64 horizontal and 64 vertical
locations
Reverse video function: Characters can be inverted on a
per character basis.
Flashing types: Two types with periods of 0.5 and 1.0
second on a per character basis (duty fixed at 50%)
Background color: One of eight colors (when internal
synchronization used)
External control input: Serial data input in 8-bit units
Built-in horizontal/vertical sync separation circuit, AFC
circuit, and synchronization detector
Video output: Composite video signal output in NTSC,
PAL, PAL-M, PAL-N, PAL60, NTSC4.43, or SECAM
format
Package Dimensions
unit: mm
3196-DIP30SD
unit: mm
3216A-MFP30S
LC74761, 74761M
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
On-Screen Display LSI
CMOS IC
SANYO: DIP30SD
[LC74761]
SANYO: MFP30S
[LC74761M]
Specifications
Absolute Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
DD
max
V
DD1
, V
DD2
pins
V
SS
0.3 to V
SS
+ 7.0
V
Maximum input voltage
V
IN
max
All input pins
V
SS
0.3 to V
DD
+ 0.3
V
Maximum output voltage
V
OUT
max
HSYNC
OUT
, VSYNC
OUT
,
V
SS
0.3 to V
DD
+ 0.3
V
SYNC
DET
pins
Allowable power dissipation
Pd max
300
mW
Operating temperature
Topr
30 to +70
C
Storage temperature
Tstg
40 to +125
C
Allowable Operating Ranges
at Ta = 30 to +70C
Ratings
Parameter
Symbol
Conditions
min
typ
max
Unit
Supply voltage
V
DD1
V
DD1
pin
4.5
5.0
5.5
V
V
DD2
V
DD2
pin
4.5
5.0
1.27 V
DD1
V
Input high level voltage
V
IH1
RST, CS, SIN, SCLK pins
0.8 V
DD1
V
DD1
+ 0.3
V
V
IH2
SECAM, 525/625,
0.7 V
DD1
V
DD1
+ 0.3
V
NTSC/PAL, 3.58/4.43 pins
Input low level voltage
V
IL1
RST, CS, SIN, SCLK pins
V
SS
0.3
0.2 V
DD1
V
V
IL2
SECAM, 525/625,
V
SS
0.3
0.3 V
DD1
V
NTSC/PAL, 3.58/4.43 pins
Input voltage
V
IN
FC, AMP
IN
pins
V
SS
0.3
V
DD1
+ 0.3
V
V
IN1
CVIN pins
2 V
PP
V
Composite video signal input voltage
V
IN2
CV
CR
pins
2 V
PP
V
V
IN3
SYNC
IN
pins
2 V
PP
2.5 V
PP
V
Oscillator frequency
NTSC
14.318
MHz
F
OSC1
Xtal
IN1
, Xtal
OUT1
, Xtal
IN2
,
PAL
17.734
MHz
Xtal
OUT2
pins; 4fsc
PAL-M
14.302
MHz
PAL-N
14.328
MHz
Electrical Characteristics
at Ta = 30 to +70C, with V
DD1
= V
DD2
= 5 V unless otherwise specified
Ratings
Parameter
Symbol
Conditions
min
typ
max
Unit
Output off leakage current
I
leak1
CV
OUT
pin
10
A
Input off leakage current
I
leak2
CV
IN
, CV
CR
pins
10
A
Output high level voltage
V
OH
HSYNC
OUT
, VSYNC
OUT
,
3.5
V
SYNC
DET
, SECAM, 525/625,
NTSC/PAL, 3.58/4.43, AMP
OUT
,
PD
OUT
pins; V
DD1
= 4.5 V, I
OH
= 1.0 mA
Output low level voltage
V
OL
HSYNC
OUT
, VSYNC
OUT
,
1.0
V
SYNC
DET
, SECAM, 525/625,
NTSC/PAL, 3.58/4.43, AMP
OUT
,
PD
OUT
pins; V
DD1
= 4.5 V, I
OL
= 1.0 mA
Input current
I
IH
RST, CS, SIN, SCLK, SECAM, 525/625,
1
A
NTSC/PAL, 3.58/4.43 pins; V
IN
= V
DD1
I
IL
SECAM, 525/625, NTSC/PAL,
1
A
3.58/4.43 pin; V
IN
= V
SS1
Oscillator frequency
F
OSC3
VCO
IN
, VCO
OUT
pins; FC = 1/2 V
DD1
14.12
MHz
Operating current dissipation
I
DD1
V
DD1
pin; All outputs open, Xtal: 4fsc
15
mA
I
DD2
V
DD2
pin; V
DD2
= 5.0 V
20
mA
Timing Characteristics
at Ta = 30 to +70C, V
DD
= 5 0.5 V
Ratings
Parameter
Symbol
Conditions
min
typ
max
Unit
Minimum input pulse width
t
W(SCLK)
SCLK pin
200
ns
t
W(CS)
CS pin (during periods when CS is high)
1
s
Data setup time
t
SU(CS)
CS pin
200
ns
t
SU(SIN)
SIN pin
200
ns
Data hold time
t
h(CS)
CS pin
2
s
t
h(SIN)
SIN pin
200
ns
One word write time
t
word
Write time for 8 bits of data
4.2
s
t
wt
RAM data write time
1
s
No. 4846-2/20
LC74761, 74761M
Pin Functions
Pin No.
Symbol
Function
Description
1
V
SS
Ground
Ground connection
2
Xtal
IN1
Crystal oscillator connection
Connection for the crystal and capacitor used to form the crystal oscillator that generates
3
Xtal
OUT1
the internal synchronization signal. The oscillator can be selected with a command switch.
4
HSYNC
OUT
Horizontal synchronization
Outputs the horizontal synchronization signal (AFC). The output polarity can be selected
output
(metal option). Also functions as general output port (command switch).
5
Xtal
IN2
Crystal oscillator connection
Connection for the crystal and capacitor used to form the crystal oscillator that generates
6
Xtal
OUT2
the internal synchronization signal.
7
VSYNC
OUT
Vertical synchronization output
Outputs the vertical synchronization signal. The output polarity can be selected (metal
option). Also functions as general output port (command switch).
8
CS
Enable input
Enables/disables serial data input. Serial data is enabled when this pin is low (hysteresis
input). Pull-up resistor built in (metal option).
9
SIN
Data input
Serial data input (hysteresis input). Pull-up resistor built in (metal option).
10
SCLK
Clock input
Clock input for serial data input (hysteresis input). Pull-up resistor built in (metal option).
SECAM mode switch input/
During input, switches between SECAM and other modes.
11
SECAM
output (command switch)
During output, functions as general output port or internal V output (command switch).
Low = other modes, high = SECAM mode
525/625 switch input/output
During input, switches between 525 scan lines and 625 scan lines.
12
525/625
(command switch)
During output, functions as general output port or character data output (command switch).
Low = 525 lines, high = 625 lines
NTSC/PAL switch input/output
Switches the color mode between NTSC and PAL.
13
NTSC/PAL
(command switch)
During output, functions as general output port or frame data output (command switch).
Low = NTSC, high = PAL
Switch FSC between 3.58 MHz and 4.43 MHz.
14
3.58/4.43
3.58/4.43 switch input/output
During output, functions as general output port or half-tone output (command switch).
(command switch)
Low = 3.58, high = 4.43
15
RST
Reset input
System reset input pin, low is active (hysteresis input).
Pull-up resistor built in (metal option).
16
CV
OUT
Video signal output
Composite video output
17
V
DD2
Power supply connection
Power supply connection for composite video signal level generation
18
CV
IN
Video signal input
Composite video input
19
CV
CR
Video signal input
SECAM chroma signal input
20
SYNC
IN
Sync separator circuit input
Built-in sync separator circuit video signal input
21
SEP
C
Sync separator circuit
Built-in sync separator circuit
22
V
SS
Ground
Ground connection
23
PD
OUT
Control voltage output
AFC control voltage output
24
AMP
IN
AFC filter connection
Filter connection
25
AMP
OUT
26
FC
Control voltage input
AFC control voltage input
27
VCO
IN
LC oscillator connection
VCO LC oscillator circuit coil and capacitor connection
28
VCO
OUT
External synchronization signal
Outputs the exclusive NOR of the horizontal synchronization signal (AFC) and CSYNC (sync
29
SYNC
DET
detection output
separator). The output polarity can be selected (metal option). Also functions as general
output port (command switch).
30
V
DD1
Power supply connection
Power supply connection (+5 V: digital system power supply)
No. 4846-3/20
LC74761, 74761M
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