SN28835 Datasheet, PDF (1/17 Pages) Texas Instruments – 1/2-INCH NTSC TIMER

SN28835
1/2-INCH NTSC TIMER
SOCS023B – FEBRUARY 1991
• NTSC-Timing Operation
• Solid-State Reliability
• Color and Monochrome Operation
• Four Selectable-Antiblooming Modes
• Variable-Integration-Time Option
• Surface-Mount Package
• Clamp-Pulse Select Option
• Horizontal and Vertical Resets for External
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.
FS PACKAGE
(TOP VIEW)
BCP1
BCP2
CP2
CP1
CSYNC
CBLK
BF
SC
SC(90)
ABS0
ABS1
44 43 42 41 40 39 38 37 36 35 34
1
33
2
32
3
31
4
30
5
29
6
28
7
27
8
26
9
25
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
GND
MODE
PI
ABIN
GT
PS
PD
S3
S2
S1
T
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.
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.
Copyright © 1991, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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