SN28837

1/2-INCH PAL TIMER

SOCS031B – JULY 1991

Copyright

1

POST OFFICE BOX 655303

Synchronization

description

The SN28837 is a monolithic integrated circuit

designed to supply timing signals for the Texas

Instruments (TI

™) 8-mm-diagonal TC276 (PAL

color) and TC277 (PAL monochrome) CCD image

sensors. The SN28837 supplies both CCD-drive

signals

and

PAL-television

synchronization

signals at standard video rates. It requires a

single 5-V supply voltage and a 13.37-MHz

crystal-oscillator input. The SN28837 provides the

user with several options including multiple

antiblooming modes, variable-integration time,

external synchronization, clamp-pulse selection,

and delayed horizontal transfer.

The SN28837 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. In

color applications, the SN28837 interfaces with the SN28838 color-subcarrier generator to generate the PAL

color subcarrier.

The SN28837 is supplied in a 60-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 appropriate 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.

VCC

VCC1

X2

X1

GND

VCC

PI

ABIN

GT

PS

NC

S3

S2

S1

T

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

BCP1

BCP2

CP1

CP2

CSYNC

CBLK

BF

VD

SCBLK

IDP

HGATE

TESTA

FI

SFI

NC

17 18 19 20 21 22 23 24 25 26 27 28 29

59 58 57 56 55 54 53 52 51 50 49 48 47

16

30

46

60

FS PACKAGE

(TOP VIEW)

NC – No internal connection

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.