2

Z86228

CPS DC-4243-00

PRELIMINARY

PIN DESCRIPTION

DONF/SEN

NRESET

BOX

LUM

R

B

HFI

VSS (Digital)

LNG/SCK

CT/SDA

NSIN

VDD (Digital)

VDD (Analog)

CVI

SSL

HLF

VSS (Analog)

1

18

2

3

4

5

6

7

8

9

17

16

15

14

13

12

11

10

G

Pin No.

Signal Description

2

NRESET

Master reset for the I.C. and must be used in the

Parallel Control Mode. It may be tied High in the

Serial Mode if reset is to be performed through

the serial data stream.

18

LAG/SCK Input (control)

In Parallel Mode this input selects the Data

Channel to be processed (along with CT). CMOS

input High=LANGUAGE I, Low=LANGUAGE II.

In Serial Mode this input is Serial Clock In.

3

Box Output (Box)

Active High, CMOS level “black box” keying

signal for Caption/Text display area.

4

Luminance Output (LUM)

Active High, CMOS level signal.

Character video luminance signal.

5, 6, 7

Color signals, RGB Outputs

Active High, CMOS level color character video

for color receiver use.

15

V

14

V

10

V

system ground.

16

(NSIN) Input (Control)

Selects the mode to be used in interpreting the

signals on the three Control pins. High = Parallel

Mode, Low = Serial Mode.

18-Pin DIP Package Diagram

Pin No.

Signal Description

11

Composite Video Input (CVI)

Composite NTSC video, nominally 1.0V p-p,.

band limited to 600 kHz. Circuit operates with

signal variations between 0.7-1.4V p-p. It is

recommended that this signal pin be driven by

an emitter follower through a 0.1

µF capacitor.

12

Sync Slice Level (SSL)

Capacitor (0.1

µF) to store sync slice level

voltage.

8

H Flyback Input (HFI)

Horizontal sync input at CMOS levels, polarity

independent. Typically derived from the H

Flyback pulse or any other horizontal timing

signal.

13

H Loop Filter (HLF)

Value to be specified

9V

Connect to system ground

1

DONF/SEN Input (control)

In Parallel Mode this input controls the Decoder

On/Off function CMOS input with High = On,

Low = Off. In Serial Mode this input is the Enable

for serial data input.

17

CT/SDA Input (control)

In Parallel Mode this input selects the Data

Channel to be processed (along with LNG).

CMOS input with High=CAPTIONS, Low =TEXT.

In Serial mode this input is serial data input.