SN28835

1/2-INCH NTSC TIMER

SOCS023B – FEBRUARY 1991

Copyright

1

POST OFFICE BOX 655303

Synchronization

description

The SN28835 is a monolithic integrated circuit

designed to supply timing signals for the Texas

Instruments (TI

™) 8-mm TC242/TC244 color and

TC243/TC245 monochrome CCD image sensors.

The SN28835 supplies both CCD-drive signals

and NTSC-television synchronization signals at

standard video rates. It requires a single

5-V

supply

voltage

and

a

14.318-MHz

crystal-oscillator input. The SN28835 provides the

user with several options

including multiple

antiblooming modes, variable-integration time,

external synchronization, and delayed horizontal

transfer.

The SN28835 is designed to drive the CCD image sensor through intermediary level-shifting devices such as

the TI TMS3473B parallel driver and the SN28846 serial driver. It also supplies sample-and-hold signals for the

TI TL1593 3-channel sample-and-hold circuit and multiplex signals for the TI TL1051 video preprocessor. The

SN28835 NTSC synchronization-signal outputs include composite sync, composite blank, clamp, subcarrier,

subcarrier delayed by 90 degrees, and burst flag.

The SN28835 is supplied in a 44-pin plastic flat package and is characterized for operation from –20

°C to 45°C.

This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These

circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C,

Method 3015; however, precautions should be taken to avoid application of any voltage higher than maximum-rated voltages to these

high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in

conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level, preferably either VCC or ground.

Specific guidelines for handling devices of this type are contained in the publication

Guidelines for Handling Electrostatic-Discharge-Sensitive

(ESDS) Devices and Assemblies available from Texas Instruments.

TI is a trademark of Texas Instruments Incorporated.

GND

MODE

PI

ABIN

GT

PS

PD

S3

S2

S1

T

12 13

1

2

3

4

5

6

7

8

9

10

11

BCP1

BCP2

CP2

CP1

CSYNC

CBLK

BF

SC

SC(90)

ABS0

ABS1

14 15 16 17

43 42 41 40 39

44

38

36 35 34

37

18 19 20 21 22

FS PACKAGE

(TOP VIEW)

33

32

31

30

29

28

27

26

25

24

23

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.