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SN28837 Datasheet(PDF) 4 Page - TI store

Part No. SN28837
Description  1/2-INCH PAL TIMER
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Maker  TI [TI store]
Homepage  http://www.ti.com
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SN28837
1/2-INCH PAL TIMER
SOCS031B – JULY 1991
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
SFI
14
O
Second field index
SH1
51
O
Sample and hold 1
S1
32
O
Serial clock 1
S2
33
O
Serial clock 2
S3
34
O
Serial clock 3
T
31
O
Transfer-gate clock
TESTA
12
O
Test A (factory-test point)
TESTB
16
O
Test B (factory-test point)
TESTC
17
O
Test C (factory-test point)
VCC
24, 40, 45
DC power
VCC1
44
Oscillator power
VCR
58
I
Vertical-counter reset
VD
8
O
Vertical drive
VDS
18
I
Vertical-dump speed. When VDS is high, the vertical-dump frequency is 3.3 MHz; when VDS is low, the
vertical-dump frequency is 2 MHz.
VD2
28
O
Real-display-area signal. VD2 is a test point and is not used in normal operation.
VGATE
20
O
Decoded V count signal. VGATE is a test point and is not used in normal operation.
X1
42
Crystal oscillator (see Figure 2)
X2
43
Crystal oscillator (see Figure 2)
12
3
tint
Flush Pulses
Transfer Pulse
GP
Figure 1. GP Flush and Transfer Pulses




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