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参数资料
| 型号： | SAA7157T-T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 29 MHz, VIDEO CLOCK GENERATOR, PDSO20 |
| 文件页数： | 7/12页 |
| 文件大小： | 68K |
| 代理商： | SAA7157T-T |
May 1992
4
Philips Semiconductors
Product specication
Clock signal generator circuit for digital TV
systems (SCGC)
SAA7157
CREF output
TV2 digital clock reference output signal. Clock qualifier signal to TV system with 2 times of LFCO or LFCO2 frequency.
Power-on reset
Power-on reset is activated at power-on, when the supply voltage decreases below 3.5 V (Fig.4) or when chip enable is
done. The indicator output RESN is LOW for a time determined by capacitor on pin 3. The RESN signal can be applied
to reset other circuits of this digital TV system.
The LFCO or LFCO2 input signals have to be applied before RESN becomes HIGH.
PINNING
Note
1. MS and LFCO2 functions are not tested. LFCO2 is a multiple of horizontal frequency.
SYMBOL
PIN
DESCRIPTION
MS
1
mode select input (LOW = PLL mode)
CE
2
chip enable /reset (HIGH = outputs enabled)
PORD
3
power-on reset delay, dependent on external capacitor
VSSA
4
analog ground (0 V)
VDDA
5
analog supply voltage (
+5 V)
VSSD1
6
digital ground 1 (0 V)
LL1.5A
7
line-locked clock output signal 1.5A (4 times fLFCO)
VDDD1
8
digital supply voltage 1 (
+5 V)
VSSD2
9
digital ground 2 (0 V)
LL1.5B
10
line-locked clock output signal 1.5B (4 times fLFCO)
LFCO
11
line-locked frequency control input signal 1
RESN
12
reset output (active-LOW, Fig.4)
VSSD3
13
digital ground 3 (0 V)
LL3A
14
line-locked clock output signal 3A (2 times fLFCO)
CREF
15
clock reference output, qualier signal (2 times fLFCO)
LFCOSEL
16
LFCO source select (LOW = LFCO selected) (1)
VDDD2
17
digital supply voltage 2 (
+5 V)
VSSD4
18
digital ground 4 (0 V)
LFCO2
19
line-locked frequency control input signal 2(1)
LL3B
20
line-locked clock output signal 3B (2 times fLFCO)
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