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參數(shù)資料
| 型號(hào)： | TMS3471C-X |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 347K |
| 代理商： | TMS3471C-X |
TMS3471C
2/3-INCH NTSC TIMER
SOCS028B – AUGUST 1991
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
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
VCC
22
DC power
VD
16
O
Vertical drive
VDS
41
I
Vertical-dump speed. When VDS is high, the vertical-dump frequency is 2 MHz; 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
Crystal oscillator (see Figure 1)
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
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