91400 RM (IM) Ohta No.6685-1/16

Ver.1.03

90699

Preliminary
Overview

The LC7454A/M is a data slicer IC for the Index Plus + signals. The LC7454A/M extracts the Caption and the Index Plus +
data form the Vertical Blanking Period of the TV signal and send it out to the decoder IC (Usually Microcomputer).
The LC7454A/M can be used to extract the Closed Caption signals, the XDS signals and the Index Plus + signals.

Features

(1) Low power dessipation by CMOS process
(2) Stable signal extraction by integrated peak hold circuit and digital circuit.
(3) Operation Voltage range

: 5V � 10%

(4) Package

LC7454A : DIP18

LC7454M : MFP20

CMOS Data Slicer

LC7454A/M

Ordering number : ENN*6685

CMOS IC

LC7454A/M

No.6685-2/16

Pin Assignment

LC7454A

LC7454M

* VDD1and VSS1are power supply terminals for digital circuit. VDD2 and VSS2 are power supply terminals for analog

circuit. Connect there terminals as the following diagram in order to reduce the noise disturbance between two powers.

DIP18

MFP20

VSS1

TEST

LN26

O/E/CFOUT

HS/CFIN

DATA

SCKIN

IOC

VSS2

VDD2

MOD1

VCOR

CVIN

MOD0

VDD1

SLICE

VSS1

TEST

LN26

O/E/CFOUT

HS/CFIN

DATA

SCKIN

IOC

VSS2

VDD2

MOD1

VCOR

CVIN

MOD0

VDD1

SLICE

VDD1

VSS1

VDD2

VSS2

Power

supply

LC7454A/M

LC7454A/M

No.6685-4/16

7454

l
ock

dia

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r
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m

2
6

SCKI

SLIC

I
nput

c
o
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l

Dat

put/

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l

t da

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u
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ffe

t da

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t b

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f
f
e
r 1

t da

outpu

t b

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f
f
e
r 5

t da

outpu

t b

u
f
f
e
r 4

t da

outpu

t b

u
f
f
e
r 3

t da

outpu

t b

u
f
f
e
r 2

t
a

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nt

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se

l
e
c
t

buf

f
e
r

S
lic

e
lin

s
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le

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io

Data

li
c
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r c

ontro

32bit da

buf

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e
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ta

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sm

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c
illa

t
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n

cir

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t

CVIN

O/E/CFOUT

HS/CFIN

(
M

e
1)

(
M

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2)

(Mo

d
e
3
)

(
M

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2)

(
M

e
1,

3
)

(
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(
M

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3)

(
M

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P
L

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k

LC7454A/M

No.6685-5/16

Operation on each mode

The LC7454 has three operating modes. The operation mode be selected by the status of MOD0 and MOD1 terminals. The functionality of
three modes are the same. Only the PLL reference frequency which is used to generate operation clock is different. Use mode1 or mode3
only in the application which uses 2x data. Any mode (Mode1,2 or 3) can be used in the 1x data only application.

Terminal

MOD1 MOD0

MODE Applications

PLL

reference

Open

Mode1 NTSC-VCR Use H-sync signal which is separated from C-Video signal.

Open

VDD1

Mode2 NTSC-VCR Use 1/32 divided signal 503 KHz which is generated by external

ceramic resonator.

VDD

Open

Mode3

NTSC-TV

Use H-sync signal from Fly Back.

Terminal Functions

Function Description

Terminal #

(DIP18)

Terminal

name

Mode 1

Mode 2

Mode 3

1 VSS1

Ground

TEST

Test terminal, Open in normal operation

3 LN26

�

s Pulse output at line 26 timing on both field

O/ E /CFOUT Pulse output for field

judgment

Output terminal for ceramic
resonator

Pulse output for field
judgment

/CFIN Sync

separated

pulse

output

Input terminal for Ceramic
resonator

External HS pulse input

DATA

Line select data input and slice data output

SCKIN

Data transmit clock input

Chip select input

IOC

Data direction control signal input

SLICE

Pulse output at selected slice line

11 VDD1

Power

terminal

MOD0

Open

Connect to VDD

Open

13 CVIN

Conposit

video

input

VCOR

Connect resister for internal VCO oscillation frequency control

MOD1

Open Open Connect

VDD

16 VDD2

Power

terminal

17 VSS2

Ground

Filter terminal for internal PLL

*1 `H' level in Odd field, `L' level in Even field.
*2 N-ch open drain in output mode.
*3 Feed `L' level only when data transmission is in effect. If CE='H', data terminal will become

input/output disable, SCKIN terminal will become input disable.

*4 `H' level : Output mode

`L' level : Input mode

Электронный компонент: LC7454A