NTE874
Integrated Circuit
TV Horiz/Vert Countdown System Circuit
Description:
The NTE874 is a monolithic bipolar/I
2
L integrated circuit digital sync system designed for use in con-
sumer TV applications for color/monochrome receivers or monitors. This device takes the composite
video input signal in combination with the onchip masterscan oscillator to provide both horizontal
drive and vertical deflection output signals.
Other onchip functions include sync separator, horizontal APC, horizontal/vertical countdown cir-
cuitry, vertical ramp generator, and horizontal drive circuit (PulseWidth Modulator).
The NTE874 features dualmode operation and accepts either standard or nonstandard video sig-
nals. An automatic moderecognition system forces the operation into the asynchronous mode for
nonstandard sync signals.
Intended for use with 525line systems, the NTE874 is supplied in the 28lead dualinline plastic
package.
Features:
D
Sync Separator
D
Master Scan Oscillator (at 64 X f
H
)
D
Automatic Phase Control (APC) of Oscillator
D
Horizontal/Vertical Countdown
D
Vertical Output
D
Horizontal Drive Output (PulseWidth Modulator)
Absolute Maximum Ratings:
POWER SUPPLY:
Power Supply Voltage, V
CC
15V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Current, I
CC
75mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Injector Supply Voltage, V
INJ
1.75V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Injector Supply Current, I
INJ
150mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings (Cont'd):
INPUTS OUTPUTS:
AGC Gate (Pin 9) Source, I
EAGC
10mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Composite Blanking (Pin 16) Sink, I
CBLNK
10mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Drive (Pin 5) Sink, I
CHD
50mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Output (Pin 3) Sink, I
CHO
30mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sync Separator Out (Pin 28), I
SYNC
30mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Drive (Pin 14) Source, I
VERT
50mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DEVICE DISSIPATION:
Maximum Rated Junction Temperature, T
JMAX
+150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximim Power Dissipation, P
D
Up to T
A
= +50
C 1.1W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Above T
A
= +50
C
Derate linearly at 11.1 mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMBIENT TEMPERATURE RANGE:
Operating, T
OP
0
to +85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage, T
STG
55
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEAD TEMPERATURE (DURING SOLDERING):
At distance 1/16
1/32 in. (1.59
0.79mm) from case for 10s max.
+265
C
. . . . . . . . . . . . . . . . . . . .
Standard Operating Range:
Parameter
Symbol
PIN #
Min
Typ
Max
Units
Analog Supply Voltage
V
CC
7
10.9
12.0
12.9
V
Analog Supply Current
I
CC
7
30
45
60
mA
Injector Supply Voltage
V
INJ
10
1.3
1.6
1.9
V
Total Dissipation, no external loads
P
D
580
mW
Force Asynchronous Low ("0")
V
FAL
2
0.5
0
+0.25
V
Force Asynchronous
V
FAH
2
0.7
0.8
1.5
V
Integrated Vertical, Low
V
IVL
1
1.9
V
Integrated Vertical, High
V
IVH
1
2.8
V
Electrical Characteristics: (T
A
= +25
C, V
CC
= 12V
DC
, V25 = 12V
DC
, Pin 2, 15, 22 to GND;, 1
F
from Pin 4 to GND., 10K ohms from Pin 28 to GND., F
CLK
= 1MHz, (AC Coupled), V
Sync
1.2V to
4V, V
IV
1.9V to 2.8V, V
FA
0.2V to 0.7V)
Parameter
Test Conditions
PIN #
Min
Typ
Max
Units
Power Supply Section
Supply Current
Pin 10 Open
7
20
45
60
mA
Injector Voltage
10
1.3
1.6
1.9
V
Sync Separator/Diff. Section
Video Inverter, High Voltage
V27 = 4V, I26 = 500
A
26
4.2
5.1
5.8
V
Sync Processor, Low Voltage
V27 = 4V, I26 = 0
A
28
.1
V
OSC/CountDown/APC Section
APC Bias
V27 = 4V, I26 = 0
A,
V21 = Open
21
6.5
6.8
7.5
V
Electrical Characteristics (Cont'd): (T
A
= +25
C, V
CC
= 12V
DC
, V25 = 12V
DC
, Pin 2, 15, 22 to
GND;, 1
F from Pin 4 to GND., 10K ohms from Pin 28 to GND., F
CLK
= 1MHz, (AC Coupled),
V
Sync
1.2V to 4V, V
IV
1.9V to 2.8V, V
FA
0.2V to 0.7V)
Parameter
Test Conditions
PIN #
Min
Typ
Max
Units
OSC/CountDown/APC Section (Cont'd)
APC Discharge
V27 = 4V, I26 = 0
A,
V21 = Open
21
6.5
6.8
7.5
V
APC Discharge
I26 = 500
A, V20 = 2V,
V21 = 2V,
V21 = VAPC Bias (above),
(Stop Clock When Pin 21
Goes Low)
21
600
803
1100
A
APC Charge
V27 = 4V, I26 = 500
A,
V20 = 6V,
V21 = VAPC Bias (above)
21
600
793 1100
A
Phase Detector
I21 = APC DischargeAPC
Charge
21
30
9.8
30
A
Sync Width, Wide
Differentiation
V27 = 5V, V23 = 1MHz,
I20 = 300
A,
V26 = Sq. Wave 0 to 5V with
T
on
= T
off
= 31.75
s
21
5
6
8
s
Sync Width, Narrow
Same as above except
T
on
= 2
s, T
off
= 61.5
s
21
1.8
2.3
2.6
s
Phase Detector Bias
V27 = 4V
20
3.9
4.3
4.7
V
Oscillator Current 1
V24 = 3V, V23 = 6V
V21 = 8.5V
25
1.4
1.8
3.0
mA
OSC/CountDown/APC Section
Oscillator Current Ratio
V24 = 3V, V23 = 6V,
V21 = Open, Measured I25 &
Divide by Oscillator Current 1
25
.45
.5
.55
Ratio
Oscillator Bias
24
4.5
4.8
5.5
V
+Phase Input Current
V24 = 0V
24
230
312
570
A
Phase Input Current
V23 = 0V
23
230
331
570
A
Flyback Charge Current
V17 = 0V, V19 = 6V
19
400
501
766
A
Flyback Discharge Current
I17 = 700
A, V19 = 6V
19
2
2.4
3.5
mA
Blanking/Gating Section
Flyback Input, Low Current 1
V18 = 0V
18
3
1
3
A
Flyback Input, High Current 1
V18 = 2V
18
0.8
1.6
3.8
mA
Flyback Input, Low Current 2
V17 = 0V
17
3
.09
3
A
Flyback Input, High Current 2
V17 = 2V
17
0.8
1.5
1.9
mA
Blanking Voltage
V18 = 2V, V23 = 1MHz, Stop
Clock when 3V < V16< 5V
16
5.8
6
6.4
V
Burst Voltage
V18 = 2V, V23 = 1MHz, Stop
Clock when V16 > 9V
16
11.2
11.95
V
Burst Saturation Voltage
V18 = 0V I16 = 5
A
16
.45
0.6
V
Electrical Characteristics (Cont'd): (T
A
= +25
C, V
CC
= 12V
DC
, V25 = 12V
DC
, Pin 2, 15, 22 to
GND;, 1
F from Pin 4 to GND., 10K ohms from Pin 28 to GND., F
CLK
= 1MHz, (AC Coupled),
V
Sync
1.2V to 4V, V
IV
1.9V to 2.8V, V
FA
0.2V to 0.7V)
Parameter
Test Conditions
PIN #
Min
Typ
Max
Units
Blanking/Gating Section (Cont'd)
Horizontal Blanking Starts
(See Notes: 1, 2, 4)
16
.07
0.6
s
Horizontal Blanking Width
(See Notes: 2, 4, 5)
16
11.75
12.3
12.75
s
Burst Gate Starts
(See Notes: 1, 2, 4)
16
0.15
.44
0.45
s
Burst Gate Trailing Edge
(See Notes: 1, 2, 4)
16
8.6
9.8
s
AGC Gate Starts
(See Notes: 1, 2, 4)
9
.37
0.9
s
AGC Gate Width 1
(See Notes: 2, 4, 5)
9
4.25
5.3
6.25
s
AGC Gate Width 2
(See Notes: 3, 4, 5)
9
4.25
5.2
6.25
s
Horizontal Drive Section
Horizontal Out, Low Voltage
Start
V
CC
= 3V, 50pF (Pin 3 to GND),
3.9 Kohm (Pin 3 to 3V)
3
2.8
V
PP
Low Voltage Horizontal Period V
CC
= 3V, V23 = 1MHz
50pF (Pin 3 to GND),
3.9Kohm (Pin 3 to 3V)
(Trigger Level 1.5V)
3
55
64
75
s
Low Voltage Horizontal Pulse
Width Symmetry
V
CC
= 3V, V23 = 1MHz,
50pF (Pin 3 to GND),
3.9Kohm (Pin 3 to 3V)
(Trigger Level 1.5V)
Find Pulse Width Divide
by Period
3
.3
.48
.7
Ratio
Pin 4 Quiescent Voltage
V6 = V8 = 6V, I5 = 20mA,
Pin 4 Open
8.4
8.7
9.1
V
Horizontal Drive Saturation
Voltage
V6 = V8 = 6V
5
174
225
mV
Horizontal Drive Symmetry
V6 = V8 = 6V,
200 ohm (Pin 5 to GND),
600 ohm (Pin 5 to V
CC
),
V4 = 15, 734Hz, 2V
pp
5
26
29.5
33
s
Horizontal Drive Ratio
3
64
s
Horizontal Pulse Width
3
31
33
s
Vertical Drive Section
Ramp Leakage
V
12
= 0V, V
11
= 1V, V
13
= 4V
11
.04
3
A
Mirror Ramp Current
I12 = 150
A, V11 = 4V,
V13 = 5V
11
.04
3
A
Ramp Charging Current,
VD High
V12 = 0V, V11 = 0V, V13 = 5V,
Stop Clock when Pin 11 Goes
High
11
5.5
10
15.5
mA
Electrical Characteristics (Cont'd): (T
A
= +25
C, V
CC
= 12V
DC
, V25 = 12V
DC
, Pin 2, 15, 22 to
GND;, 1
F from Pin 4 to GND., 10K ohms from Pin 28 to GND., F
CLK
= 1MHz, (AC Coupled),
V
Sync
1.2V to 4V, V
IV
1.9V to 2.8V, V
FA
0.2V to 0.7V)
Parameter
Test Conditions
PIN #
Min
Typ
Max
Units
Vertical Drive Section (Cont'd)
Amplifier Input Voltage
Range, VD Low
100ohm (Pin 14 to GND)
V13 = 1.7V,
Set V11 for V14 = 2V
Record V11, 13; Then V13 = 4V
Record V11, 13;
Find Difference Stop Clock
When Pin Goes Low
11,13
50
mV
Vertical, OnState Voltage
V12 = 0V, V11 = 3V, V13 = 5V,
I14 = 45 mA
14
1.4
V
Vertical, OffState Current
V12 = 0V, V11 = 4V, V13 = 3V,
V14 = 5V
14
2
A
Open Loop, Small Signal
Voltage Gain
100 ohm (Pin 14 to GND)
V13 = 2V
Set V11 thru 1K ohm for
V14 = 2V
Apply 1kHz, 1V
RMS
to Pin 11
Thru 99 K ohm and 1
F
Avol = 20 LOG|V14 (AC)/V11
(AC))
11,14
24
33
39
dB
Mode Change
NonStandard IV Field
Count STD/NONSTD
Sync = 9, Within IV Window
(See Note 6)
11,16
5
7
Mode Change
NonStandard Vertical
Sync Field
Count STD/NONSTD
Sync = Less than 9
11,16
5
7
Mode Change
Field Confidence Count,
NONSTD/STD
Number of New Timing
IV/Sync Periods to Return to
STD Mode
11,16
7
14
Standard Mode Divide Ratio
IV = 16800
Clock Ratio Sync = 9 )
Serrations within 384 Clock
Window (After 8 Fields, i.e: On
9th Field)
16800
Standard Mode Vertical
Pulse Width
(See Note 7)
Number of Clock Cycles
Output is On
11
383
384
387
NonStandard Mode
IV Ratio Range Can Be and
Cause Proper Syncronization,
Except for IV Ratio Range of
(1674816832), Sync = Don't
Care (After 7 Fields, i.e.: on
8th Field)
16160
17405
NonStandard Vertical
Pulse Width
Number of Clock Cycles
Output is On
11
362
364
367
Electrical Characteristics (Cont'd): (T
A
= +25
C, V
CC
= 12V
DC
, V25 = 12V
DC
, Pin 2, 15, 22 to
GND;, 1
F from Pin 4 to GND., 10K ohms from Pin 28 to GND., F
CLK
= 1MHz, (AC Coupled),
V
Sync
1.2V to 4V, V
IV
1.9V to 2.8V, V
FA
0.2V to 0.7V)
Parameter
Test Conditions
PIN #
Min
Typ
Max
Units
Vertical Drive Section (Cont'd)
NonStandard Vertical
Pulse Width
Sync 9 Serrations Within 384
Clock Window, Number of
Clock Cycles Output is On
11
362
364
367
NonStandard Mode Asynch-
ronous Divide Ratio
No IV or Sync Applied (After 7
Fields, i.e., on 8th Field)
11, 16
21888
Blanking Pulse Width
16
1200
1216
1220
Noise Mode Change
IV Outside the Range of
(1678416832) Sync = 9
Serrations in 384 Clock Win-
dow Pulse Applied 2432 to
11520 After an IV, Pulse is 8
to 32 Clocks Wide. Resync
results in next field and is
maintained for Mode Change
Confidence Count
11,16
16800
Force NonStandard Mode
IV = 16800 Sync = 9 Serra-
tions Within 384 Clock Win-
dow. VFA Open Circuit Verti-
cal Pulse Width M Measured
in Next Field.
11
362
364
367
s
Note 1 All timing measurements are with reference to the leading edge of the flyback pulse input
to Pin 18. Flyback pulse width is 12.00
s and it is from 0 to 5V. Flyback pulse train should
start about 500
s after the start of vertical drive pulse.
Note 2 Start of flyback pulse is 90 degrees leading with clock.
Note 3 Start of flyback pulse is 90 degrees lagging with clock.
Note 4 Threshold for measuring AGC gate and horizontal blanking is 3V and burst gate is at 9V.
Note 5. Timing measurements referenced to trailing edge of negative sync pulse input to Pin 26. The
negative sync pulse width is is 4.5
s and is from 0 to 500
A, with negative leading edge
delayed 0.5
s from the positive leading edge of the flyback pulse. The input to Pin 27 is
+4V
DC
.
Note 6 IV Ratio same as in NonStandard Mode Ratio Range Test.
Note 7 IV Ratio same as in Standard Mode Ratio Test.
Note 8 Burst Gate Start is with reference to trailing edge of sync pulse at Pin 26. Sync Pulse is a
500
A Sink Current at Pin 26
.
28
Pin Connection Diagram
V
CC
OSC tank Lead Input
Vert Height Adjust
Vert Ramp Shape
GND
APC Filter
1
2
3
4
Integrated Vert Input
Mode Select
Horiz Output
Horiz Sawtooth Input
5
Horiz Drive Output
6
B+ Adjust Ref
7
8
Beam Current
27
26
25
Sync Output
Composite Video Input
Sync Sep Filter
OSC Tank
24
OSC Tank Lag Input
23
22
21
Flyback Sawtooth Ramp
9
AGC Gate Output
20
Flyback Sawtooth Filter
Flyback Input 1
10
Shunt Reg
11
19
18
Flyback Input 2
12
17
Sandcastle Output
13
Vert Feedback
16
Vert GND
14
Vert Output
15
Feedback Ref
1.469 (37.32)
Max
1.300 (33.02)
.540
(13.7)
.600
(15.24)
.250
(6.35)
.122
(3.1)
Min
.100 (2.54)
15
28
14
1
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