SANYO LC74786, LC74786M, LC74786JM Datasheet

Overview

The LC74786, LC74786M, and LC74786JM are on­screen display controller CMOS ICs that display
characters and patterns on the TV screen under
microprocessor control. These ICs support 12 × 18-dot
characters and can display 12 lines by 24 characters of
text.

Features

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

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

• Character sizes: Three sizes each in the horizontal and
vertical directions

• Characters in font: 128 (128 characters, one spacing
character, and one transparent spacing character)

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

• Blinking: Specifiable in character units

• Blinking types: Two periods supported: About 1.0
second and about 0.5 second

• Blanking: Over the whole font (12 × 18 dots)

• Background color: 8 colors (internal synchronization
mode): 2fSCand 4f

SC

• Line background color
— Can be set for 3 lines
— Line background color: 8 colors (internal

synchronization mode): 2fSCand 4f

SC

• External control input: 8-bit serial input format

• On-chip sync separator circuit

• Video outputs - NTSC, PAL, PAL-N, PAL-M, NTSC

4.43, and PAL60 format composite video outputs

• Package
— 24-pin plastic DIP-24S (300 mil)
— 24-pin plastic MFP-24 (375 mil)
— 24-pin plastic MFP-24S (300 mil)

Package Dimensions

unit: mm

3067-DIP24S

unit: mm

3045B-MFP24

unit: mm

3112-MFP24S

CMOS IC

30698HA (OT) No. 5729-1/23

SANYO: DIP24S

[LC74786]

SANYO: MFP24

[LC74786M]

SANYO: MFP24S

[LC74786JM]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

On-Screen Display Controller

LC74786, 74786M, 74786JM

Ordering number : EN5729A

Pin Assignment

No. 5729-2/23

LC74786, 74786M, 74786JM

Pin Functions

Pin No. Pin Name Function Notes

1 V

SS

1 Ground Ground connection (digital system ground)

2 Xtal

IN

These pins are used either to connect the crystal and capacitors used to form an external

Crystal oscillator

crystal oscillator circuit to generate the internal synchronizing signals, or to input an external

Xtal

OUT

(MUTE input)

clock signal (2fsc or 4fsc). As a mask option, the Xtal

OUT

pin can be set to function as the

3

(MUTE) MUTE input pin. When this pin is set low, the video output is held at the pedestal level. (A pull-

up resistor is built in and the input has hysteresis characteristics.)
Switches the mode between external clock input and crystal oscillator operation. A low level

4

CTRL1 Crystal oscillator input switching selects crystal oscillator operation and a high level selects external clock input. As a mask

(CHABLK) (CHABLK output) option, the CTRL1 input pin can be set to function as the CHABLK (character · frame) output.

This is a 3-value output.

5 HFTON

OUT

Background line output

Outputs the range signal specified by LNA*, LNB*, and LNC*. Outputs the crystal oscillator
clock when RST is low. (This signal is not output after a reset command is executed.)

6 OSC

IN

LC oscillator

Connections for the inductor and capacitor that form the character output dot clock generation

7 OSC

OUT

oscillator.
Outputs the state of the external synchronizing signal presence/absence judgment. Outputs a

8 SYNC

JDG

External synchronizing signal high level when synchronizing signals are present.

judgment output Outputs the dot clock (LC oscillator) when RST is low. (This signal is not output on command

resets.)

9 CS Enable input

Serial data input circuit enable pin. Serial data input is enabled when a low level is input.
A pull-up resistor is built in. (This input has hysteresis characteristics.)

10 SCLK Clock input

Serial data input circuit clock input.
A pull-up resistor is built in. (This input has hysteresis characteristics.)

11 SIN Data input

Serial data input.
A pull-up resistor is built in. (This input has hysteresis characteristics.)

12 V

DD

2 Power supply Composite video signal level adjustment power supply (analog system power supply)

Continued on next page.

No. 5729-3/23

LC74786, 74786M, 74786JM

Continued from preceding page.

Pin No. Pin Name Function Notes

13 CV

OUT

Video signal output Composite video signal output

14 V

SS

2 Ground Ground connection (analog system ground)

15 CV

IN

Video signal input Composite video signal input

16 V

DD

1 Power supply Power supply (+5 V: digital system power supply)

Video signal input to the internal sync separator circuit (Used as either the horizontal

17 SYN

IN

Sync separator circuit input synchronizing signal or the composite synchronizing signal input when the internal sync

separator circuit is not used.)

18 SEP

C

Sync separator circuit bias

Internal sync separator circuit bias voltage monitor

voltage

19 SEP

OUT

Composite synchronizing Internal sync separator circuit composite synchronizing signal output. Can be switched to

signal output function as a signal (high, low, or ST. pulse) output by the SEL0 and MOD0 setting.

Inputs the vertical synchronizing signal created by integrating the SEP

OUT

pin output signal.

20 SEP

IN

Vertical synchronizing signal input

An integration circuit must be connected to the SEP

OUT

pin. This pin must be tied to VDD1 if
unused. This pin can be switched to function as the frame signal input mode by setting SEL1
high. This is valid when CTL3 is set high. This input has hysteresis characteristics.

Pin settings take priority for switching between the NTSC, PAL, PAL-M, PAL-N, NTSC 4.43,

21 CTRL2 NTSC/PAL-M selection input

and PAL60 video formats. The NTSC format is selected when this pin is low after a reset.
The command video format (NTSC, PAL, PAL-M, PAL-N, NTSC 4.43, or PAL60) selection is
valid. The PAL-M format is selected when this pin is high.

22 CDLR

Background color phase

Background color phase adjustment. Connect a resistor between this pin and ground.

adjustment

23 RST Reset input

System reset input.
A pull-up resistor is built in and the input has hysteresis characteristics.

24 V

DD

1 Power supply (+5 V) Power supply (+5 V: digital system power supply)

Note: Both VDD1 pins must be connected to the power supply.

No. 5729-4/23

LC74786, 74786M, 74786JM

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max VDD1 and VDD2 VSS–0.3 to VS +6.5 V

Maximum input voltage V

IN

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

Maximum output voltage V

OUT

max HFTON

OUT

, SYNC

JDG

, and SEP

OUT

VSS–0.3 to VDD+0.3 V
Allowable power dissipation Pd max Ta = 25°C 350 mW
Operating temperature Topr –30 to +70 °C
Storage temperature Tstg –40 to +125 °C

Specifications

Absolute Maximum Ratings

Parameter Symbol Conditions

Ratings

Unit

min typ max

Supply voltage

V

DD

1 VDD1 4.5 5.0 5.5 V

V

DD

2 VDD2 4.5 5.0 1.27 VDD1 V

Input high-level voltage

V

IH

1 RST, CS, SIN, SCLK, SEPIN, and MUTE 0.8 VDD1 VDD1+0.3 V

V

IH

2 CTRL1 and CTRL2 0.7 VDD1 VDD1+0.3 V

Input low-level voltage

V

IL

1 RST, CS, SIN, SCLK, SEPIN, and MUTE V

SS

– 0.3 0.2 VDD1 V

V

IL

2 CTRL1 and CTRL2 V

SS

– 0.3 0.3 VDD1 V

Pull-up resistance R

PU

RST, CS, SIN, SCLK, and MUTE

25 50 90 kΩ

Applies to pins set up by options.

Composite video signal input voltage

V

IN

1 CVIN: VDD1 = 5 V 2.0 Vp-p

V

IN

2 SYNIN: VDD1 = 5 V 2.0 2.5 Vp-p

Input voltage V

IN

3

Xtal

IN

(when used for external clock input)

0.10 5.0 Vp-p

f

IN

= 2fsc or 4fsc ; VDD1 = 5 V

Xtal

IN

and Xtal

OUT

oscillator pins (2fsc: NTSC) 7.159 MHz

Xtal

IN

and Xtal

OUT

oscillator pins (4fsc: NTSC) 14.318 MHz

Xtal

IN

and Xtal

OUT

oscillator pins (2fsc: PAL) 8.867 MHz

F

OSC

1

Xtal

IN

and Xtal

OUT

oscillator pins (4fsc: PAL) 17.734 MHz

Oscillator frequencies Xtal

IN

and Xtal

OUT

oscillator pins (2fsc: PAL-M) 7.151 MHz

Xtal

IN

and Xtal

OUT

oscillator pins (4fsc: PAL-M) 14.302 MHz

Xtal

IN

and Xtal

OUT

oscillator pins (2fsc: PAL-N) 7.164 MHz

Xtal

IN

and Xtal

OUT

oscillator pins (4fsc: PAL-N) 14.328 MHz

F

OSC

2 OSCINand OSC

OUT

oscillator pins (LC oscillator) 5 10 MHz

Allowable Operating Ranges

Note: Applications must be especially cautious about noise when using the XtalINinput pin in clock input mode.

No. 5729-5/23

LC74786, 74786M, 74786JM

Parameter Symbol Pin Conditions

Ratings

Unit

min typ max

Input off leakage current I

leak1

CV

IN

1 µA

Output off leakage current I

leak2

CV

OUT

1 µA

Output high-level voltage V

OH

1 HFTON

OUT

, SYNC

JDG

, and SEP

OUT

VDD1 = 4.5 V,

3.5 V

I

OH

= –1.0 mA

Output low-level voltage V

OL

1 HFTON

OUT

, SYNC

JDG

, and SEP

OUT

VDD1 = 4.5 V,

1.0 V

I

OL

= –1.0 mA

H 3.3 5.0 V

Three-value output voltage V

O

CHABLK VDD1 = 5.0 V M 1.8 2.3 V

L 0 0.8 V

Input current

I

IH

RST, CS, SIN, SCLK, CTRL1,

V

IN

= VDD1 1 µA

SEP

IN

, and MUTE

I

IL

CTRL1 and OSC

IN

VIN= VSS1 –1 µA
All outputs: open

Operating mode current drain

I

DD

1 VDD1

Xtal:7.159 MHz

15 mA

LC:8 MHz

I

DD

2 VDD2 VDD2 = 5 V 20 mA

(1) 0.70 0.82 0.94

SYNC level V

SN

(2) 0.89 1.01 1.13 V
(3) 1.18 1.30 1.42
(1) 1.32 1.44 1.56

Pedestal level V

PD

(2) 1.52 1.64 1.76 V
(3) 1.81 1.93 2.05
(1) 0.98 1.10 1.22

Color burst low level V

CBL

(2) 1.17 1.29 1.41 V
(3) 1.46 1.58 1.70
(1) 1.63 1.75 1.87

Color burst high level V

CBH

(2) 1.83 1.95 2.07 V
(3) 2.11 2.23 2.35
(1) 1.17 1.29 1.41

Background color low level (other than blue) V

RSL

0 (2) 1.36 1.48 1.60 V

(3) 1.65 1.77 1.89
(1) 2.33 2.45 2.57

Background color high level (other than blue) V

RSH

0 CV

OUT

(2) 2.52 2.64 2.76 V

(1): When the sync level = 0.8 V V

DD

1 = 5.0 V (3) 2.81 2.93 3.05

(2): When the sync level = 1.0 V V

DD

2 = 5.0 V (1) 1.08 1.20 1.32

Blue background 1 low level V

RSL

1 (3): When the sync level = 1.3 V (2) 1.27 1.39 1.51 V

(3) 1.56 1.68 1.80
(1) 1.49 1.61 1.83

Blue background 2 low level V

RSL

2 (2) 1.68 1.80 1.92 V

(3) 1.97 2.09 2.21
(1) 1.97 2.09 2.21

Blue background 1 and 2 high level V

RSH

1, 2 (2) 2.17 2.29 2.41 V

(3) 2.46 2.58 2.70
(1) 1.40 1.52 1.64

Frame level 0 V

BK

0 (2) 1.60 1.72 1.84 V

(3) 1.89 2.01 2.13
(1) 1.97 2.09 2.21

Frame level 1 V

BK

1 (2) 2.17 2.29 2.41 V

(3) 2.46 2.58 2.70
(1) 2.55 2.67 2.79

Character level V

CHA

(2) 2.75 2.87 2.99 V
(3) 3.04 3.16 3.28

Electrical Characteristics at Ta = –30 to +70°C. VDD1 = 5 V unless otherwise specified.

Note: Blue background 1 or 2 are option settings.

No. 5729-6/23

LC74786, 74786M, 74786JM

Parameter Symbol Conditions

Ratings

Unit

min typ max

Minimum input pulse width

t

W(SCLK)

SCLK 200 ns

t

W(CS)

CS (The period when 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

One word write time

t

word

The time to write 8 bits of data 4.2 µs

t

wt

The RAM data write time 1 µs

Timing Characteristics at Ta = –30 to +70°C, VDD1 = 5 ±0.5 V

Serial Data Input Timing

First byte

Second byte

System Block Diagram

No. 5729-7/23

LC74786, 74786M, 74786JM

Serial to

parallel

converter

8-bit

latch +

command

decode

Horizontal

character

size register

Vertical

character

size register

Horizontal

display

position

register

Vertical

display

position

register

Blinking and

reverse

control

register

Display

control

register

RAM write

address

counter

Display

RAM

Deco-

der

Decoder

Font ROM

Shift register

Character output

control

Background control

Video output control

Blinking and

reverse

control circuit

Vertical dot

counter

Horizontal

dot counter

Vertical size

counter

Horizontal

size counter

Vertical display

position

detector

Horizontal

display position

detector

Line control

counter

Character

control

counter

Synchroni-

zation

determination

Composite sync

signal separation

control

Sync

separator

Character

output dot

clock

generator

Sync signal

generator

Timing generator