SN28837
1/2-INCH PAL TIMER
SOCS031B – JULY 1991
FS PACKAGE
(TOP VIEW)
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PAL-Timing Operation
Solid-State Reliability
Color and Monochrome Operation
Five Selectable-Antiblooming Modes
Variable-Integration-Time Option
Surface-Mount Package
60 59 58 57 56 55 54 53 52 51 50 4948 47 46
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2
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5
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8
45
BCP1
BCP2
CP1
V
V
X2
CC
CC1
44
43
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38
Clamp-Pulse Select Option
Horizontal and Vertical Resets for External
Synchronization
CP2
X1
GND
CSYNC
CBLK
BF
V
PI
CC
description
VD
ABIN
GT
PS
NC
S3
S2
S1
T
9
37
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31
SCBLK
IDP
HGATE
TESTA
FI
The SN28837 is a monolithic integrated circuit
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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-oscillatorinput. The SN28837 provides the
user with several options including multiple
antiblooming modes, variable-integration time,
external synchronization, clamp-pulse selection,
and delayed horizontal transfer.
SFI
NC
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NC – No internal connection
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,
Method3015;however, precautionsshouldbetakentoavoidapplicationofanyvoltagehigherthanmaximum-ratedvoltagestothese
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 V
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.
or ground.
CC
TI is a trademark of Texas Instruments Incorporated.
Copyright 1991, Texas Instruments Incorporated
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.
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265