Texas Instruments TMS3471C-X, TMS3471C Datasheet
TMS3471C
2/3-INCH NTSC TIMER
SOCS028B – AUGUST 1991
Copyright 1991, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• NTSC-Timing Operation
• Solid-State Reliability
• Monochrome Operation
• Eight Selectable-Antiblooming Modes
• Surface-Mount Package
• Clamp-Pulse Select Option
description
The TMS3471C is a monolithic integrated circuit
designed to supply timing signals for the Texas
Instruments (TI) 1 1-mm diagonal TC241 monochrome CCD image sensor. The TMS3471C
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
TMS3471C provides several options, including
multiple antiblooming modes, clamp-pulse selection, and delayed horizontal transfer.
The TMS3471C is used in conjunction with
level-shifting devices such as the TI TMS3473B
parallel driver and the TI TMS3472A serial driver.
It also supplies sample-and-hold signals for the TI TL1593 three-channel sample-and-hold and multiplex signals
for the TI TL1051 video preprocessor. The TMS3471C NTSC synchronization-signal outputs include composite
sync, composite blank, clamp, subcarrier, subcarrier delayed by 90 degrees, and burst flag.
The TMS3471C 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 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.
GND
SH1
SH2,3
PI
ABIN
GT
PS
PD
S2,3
S1
T
12 13
1
2
3
4
5
6
7
8
9
10
11
BCP2
CP2
CP1
CSYNC
CBLK
BF
SC
SC(90)
ABS0
ABS1
ABS2
14 15 16 17
FS PACKAGE
(TOP VIEW)
GT2
GT1X2X1
43 42 41 40 3944 38
BCP1FIE/L
VDS
BCPS1
BCPS0
GT3
VGATE
HGATE
CLK2M
V
HIGH
I/N
SB
GP
VD
WHTA
WHTB
36 35 3437
18 19 20 21 22
CC
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.
TI is a trademark of Texas Instruments Incorporated.
TMS3471C
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
Oscillator
Divide
by 4
14.318
MHz
3.58 MHz
Horizontal
Counter
Vertical
Counter
Clock
Generator
Antiblooming
Generator
Serial/
Sample-and
-Hold
Generator
Decoder
17
18
16
20
19
5
4
3
2
44
1
6
43
39
40
WHTA
WHTB
VD
HGATE
VGATE
CBLK
CSYNC
CP1
CP2
BCP1
BCP2
BF
FI
BCPS0
BCPS1
S1
S2,3
SH1
SH2,3
GT1
GT2
GT3
E/L
24
25
32
31
36
37
38
42
X1
34
X2
35
8
SC(90)
7
SC
Divide
by 7
2.045 MHz
CLK2M
21
26
28
27
30
23
41
13
15
PD
GT
PS
PI
T
VDS
I/N
GP
29
11
10
9
ABIN
ABS2
ABS1
ABS0
SB
14
The levels on these three terminals determine which of the eight antiblooming modes is selected:
MODE ABS2 ABS1 ABS0 Operation
0LLLNo ABG pulses
1 L L H 250-kHz clocking during flyback only
2 L H L 1-MHz clocking during flyback only
3 L H H 2.2-MHz clocking during flyback only
4 H L L 250-kHz continuous clocking
5 H L H 500-kHz continuous clocking
6 H H L 1-MHz continuous clocking
7 H H H 2.2-MHz continuous clocking
TMS3471C
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Terminal Functions
TERMINAL
NAME NO.
I/O
DESCRIPTION
ABIN 29 O Antiblooming in. ABIN drives the ABG input of the TC240/TC241 CCD image sensors.
ABS0 9 I
ABS1 10 I
ABS2 11 I
BCP1 44 O Optical black clamp pulse 1
BCP2 1 O Optical black clamp pulse 2
BCPS0 39 I
The levels on BCPS0 and BCPS1 determine the placement and duration of the BCP1 and BCP2 pulses
BCPS1 40 I
relative to the horizontal scan timing (see Figure 4 for the truth table for BCPS0 and BCPS1 and for the
corresponding BCP1 and BCP2 pulse placements).
BF 6 O Burst flag
CBLK 5 O Composite blank
CLK2M 21 O 2-MHz clock
CP1 3 O Clamp
CP2 2 O Clamp
CSYNC 4 O Composite sync
E/L 42 I
Delay select for S1 and S2,3. When E/L is high, the two serial-transfer pulses occur early relative to the
sample-and-hold pulses SH1 and SH2,3. When E/L
is low, the two serial-transfer pulses occur late
relative to the sample-and-hold pulses.
FI 43 O Field index
GND 33 Ground
GP 15 I Exposure control: GP gates PS and PI
GT 28 O TMS3473B parallel-driver MIDSEL input switch
GT1 36 O Y gate 1
GT2 37 O Y gate 2
GT3 38 O Y gate 3
HGATE 20 O Decoded H count signal. HGA TE is a test point and is not used in normal operation.
HIGH 12 I Not used (tie high)
I/N 13 I Interlace select. If high, interlace mode is selected; if low, noninterlace mode is selected.
PD 26 O Power down. A low-logic level on PD causes the device to enter a low power-consumption mode.
PI 30 O Parallel-image-area gate clock
PS 27 O Parallel-storage-area gate clock
SB 14 I
Standby-mode select. When SB is high, normal operation is selected; when SB is low, the power-down
mode is selected.
SC 7 O Subcarrier (3.58 MHz)
SC(90) 8 O Subcarrier phase shifted by 90 degrees
SH1 32 O Sample-and-hold pulse 1
SH2,3 31 O Sample-and-hold pulse 2, 3
TMS3471C
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
NAME NO.
I/O
DESCRIPTION
S1 24 O Serial clock 1
S2,3 25 O Serial clock 2, 3
T 23 O Transfer-gate clock
V
CC
22 DC power
VD 16 O Vertical drive
VDS 41 I
Vertical-dump speed. When VDS is high, the vertical-dump frequency is 2MHz; when VDS is low, the
vertical-dump frequency is 1 MHz. VDS can also function as a timer reset by dropping the voltage on
VDS from VCC to VCC/2 and then raising it back to VCC.
VGATE 19 O Decoded V count signal. VGATE is a test point and is not used in normal operation.
WHTA 17 O WHTA is a test point and is not used in normal operation.
WHTB 18 O WHTB is a test point and is not used in normal operation.
X1 34
X2 35
Crystal oscillator (see Figure 1)
X1 X2
34 35
C1 ≈ 40 pF C2 ≈ 40 pF
TMS3471C
NOTE: The TMS3471C is designed for use with
a crystal oscillator. The X1 and X2
terminals should not connect directly to
external driver outputs.
Figure 1. Connection of an External Crystal Oscillator to the TMS3471C
TMS3471C
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absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
–0.3 V to VCC + 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
–0.3 V to VCC + 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation: T
A
= 25°C 550 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T
A
= 45°C 440 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T
A
= 75°C 275 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
–20°C to 45°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –55°C to 125° C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 3 seconds 350°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to GND.
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.5 5 5.5 V
High-level input voltage, V
IH
V
Low-level input voltage, V
IL
0.8 V
Operating frequency 14.31818 MHz
Power-up time 300 µs
Operating free-air temperature, T
A
–20 45 °C
TMS3471C
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electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature, V
CC
= 5 V (unless otherwise noted)
†
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
OH
High-level output voltage IOH <1 µA 4.95 V
V
OL
Low-level output voltage IOL <1 µA 0.05 V
p
VCC = 5 V 75
I
IH
‡
High-level input current
VCC = 4.5 V 65
µ
A
p
VCC = 5.5 V 225
IILLow-level input current
VCC = 5 V 200
µ
A
S1, T, ABIN, PS, PI, GT –0.1
S2,3, PD –0.2
SH1, GT1, GT2, GT3 –2.5
SH2,3
–5
I
OH
High-level output current BCP1, BCP2
V
OH
= 3.5
V
–1 mA
SC, SC(90) –3
CP2 –0.6
CLK2M –0.3
All other outputs VOH= 4.6 V –0.5
S1, T, ABIN, PS, PI, GT 0.1
S2,3, PD 0.2
SH1, GT1, GT2, GT3 2.5
SH2,3 5
I
OL
Low-level output current BCP1, BCP2 VOL= 0.4 V 1 mA
SC, SC(90) 0.3
CP2 0.6
CLK2M 0.3
All other outputs 0.5
I
CC(AV)
Average supply current 40 mA
I
CC(S)
Standby supply current 15 mA
†
The SB input is a Schmitt-trigger input with 0.5-V to 1-V hysteresis.
‡
All inputs have pullup-current sources.
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