SANYO LC74770M Datasheet

Ordering number : EN4248A

31596HA (OT) No. 4248-1/11

Overview

The LC74770M is a CMOS LSI that implements on­screen display, a function that displays characters and
patterns on display screens such as camcorder viewfinder
screens under microprocessor control. This LSI displays
12-dot by 18-dot characters.

Features

• Display format: 24 characters by 12 rows (up to
288 characters)

• Characters displayed: Up to 288 characters

• Character format: 12 (horizontal) × 18 (vertical)

• Characters in font: 128

• Character sizes: Normal and double

• Initial display positions: 64 horizontal positions and
64 vertical positions

• Reverse video function: Characters can be displayed in
reverse video specified in units of individual characters.

• Blinking types: In character units in one of two periods,

1.0 second and 0.5 second, with a 50% duty.

• Outputs: Character and blanking data, with two output
systems for each

• External control input: 8-bit serial input format

• General-purpose output port: 4 bits (controlled from the
serial input data)

Pin Assignment

Package Dimensions

unit: mm

3112-MFP24S

SANYO: MFP24S

[LC74770M]

LC74770M

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 Controller LSI

CMOS LSI

Top view

Specifications

Absolute Maximum Ratings at Ta = 25°C

Allowable Operating Ranges at Ta = –30 to +70°C

Electrical Characteristics at Ta = –30 to +70°C, VDD= 5 V unless otherwise specified.

Timing Characteristics at Ta = –30 to +70°C, VDD= 5 ± 0.5 V

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LC74770M

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max V

DD

VSS– 0.3 to VSS+ 7.0 V

Maximum input voltage V

IN

max All input pins VSS– 0.3 to VDD+ 0.3 V

Maximum output voltage V

OUT

max BLK1, BLK2, CHA1, CHA2, P0 to P3, CK

OUT

VSS– 0.3 to VDD+ 0.3 V
Allowable power dissipation Pd max 300 mW
Operating temperature Topr –30 to +70 °C
Storage temperature Tstg –40 to +125 °C

Parameter Symbol Conditions min typ max Unit

Supply voltage V

DD

V

DD

4.5 5.0 5.5 V

Input high-level voltage V

IH

RST, CS, SIN, SCLK, HSYNC, VSYNC 0.8 V

DD

VDD+ 0.3 V

Input low-level voltage V

IL

RST, CS, SIN, SCLK, HSYNC, VSYNC VSS– 0.3 0.2 V

DD

V

Oscillator frequency f

OSC

OSCINand OSC

OUT

oscillator pins 5 7 10 MHz

Parameter Symbol Conditions min typ max Unit

Output high-level voltage V

OH

BLK1, BLK2, CHA1, CHA2, P0 to P3: VDD= 5.0 V,

4.5 V

I

OH

= –1.0 mA

Output low-level voltage V

OL

BLK1, BLK2, CHA1, CHA2, P0 to P3: VDD= 5.0 V,

0.5 V

I

OL

= 1.0 mA

Input current

I

IH

RST, CS, SIN, SCLK, HSYNC, VSYNC: VIN= V

DD

1 µA

I

IL

HSYNC, VSYNC: VIN= V

SS

–1 µA

Operating current drain I

DD

VDD: all outputs open, LC = 7 MHz 10 mA

Parameter Symbol Conditions min typ max Unit

Minimum input pulse width

t

W (SCLK)

SCLK 200 ns

t

W (CS)

CS (the period that CS is high) 1 µs

Data setup time

t

SU (CS)

CS 200 ns

t

SU (SIN)

SIN 200 ns

Data hold time

t

h (CS)

CS 2 µs

t

h (SIN)

SIN 200 ns

Single word write time

t

word

The time to write 8 bits of data 4.2 µs

t

wt

The time to write RAM data 1 µs

Serial Data Input Timing

Pin Functions

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LC74770M

No. Symbol Pin Function

1 V

SS

Ground pin Ground connection

2 OSC

IN

LC oscillator pin

Connections for the coil and capacitor that form the oscillator that generates the character output

3 OSC

OUT

dot clock.

4 CK

OUT

/TEST

Clock output/test

Provides the OSC

OUT

output (when RST is low) and the test mode output.

output pin

5 P0

General-purpose port 0

General-purpose port (PORT0) output

output pin

6 P1

General-purpose port 1

General-purpose port (PORT1) output

output pin

7 CS Enable input pin

Enable input for the serial data input function. Serial data input is enabled when this pin is low.
A pull-up resistor is built in, i.e., this is a hysteresis input.

8 SCLK Clock input pin

Clock input for the serial data input function. A pull-up resistor is built in,
i.e., this is a hysteresis input.

9 SIN Data input pin Serial data input. A pull-up resistor is built in, i.e., this is a hysteresis input.

10 V

SS

Ground pin Ground connection
11 NC No connection
12 NC No connection

Unused pins.

13 NC No connection

These pins must be left open or connected to ground.

14 NC No connection
15 CHA1 Character 1 output pin System 1 character data output
16 BLK1 Blank 1 output pin System 1 blank data output
17 CHA2 Character 2 output pin System 2 character data output
18 BLK2 Blank 2 output pin System 2 blank data output

19 P3

General-purpose port 3

General-purpose port (PORT3) output

output pin
20 P2

General-purpose port 2

General-purpose port (PORT2) output

output pin
21 VSYNC

Vertical synchronizing

Input for the vertical synchronizing signal (active low)

signal input pin
22 HSYNC

Horizontal synchronizing

Input for the horizontal synchronizing signal (active low)

signal input pin
23 RST Reset input pin System reset input (active low) A pull-up resistor is built in, i.e., this is a hysteresis input.
24 V

DD

Power supply pin (+5 V) Power supply (+5 V)

Block Diagram

Display Control Commands

Display control commands have an 8-bit format and are transferred using the serial input function. Commands consist of
a command identification code in the first byte and command data in the following bytes. The following commands are
supported.

1 COMMAND 0: Display memory (VRAM) write address setup command
2 COMMAND 1: Display character data write command
3 COMMAND 2: Vertical display start position and vertical character size setup command
4 COMMAND 3: Horizontal display start position and horizontal character size setup command
5 COMMAND 4: Display control setup command
6 COMMAND 5: System 2 (BLK2 and CHA2) output control (lines 1 to 6) and line size setting command
7 COMMAND 6: System 2 (BLK2 and CHA2) output control (lines 7 to 12) and general-purpose port setting command

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