MC145170P2 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC145170P2

PLL Frequency Synthesizer with Serial Interface

Freescale Semiconductor 

Pin Connections

3.5 Power Supply

VDD

Most Positive Supply Potential (Pin 16)

This pin may range from 2.7 to 5.5 V with respect to VSS.

For optimum performance, VDD should be bypassed to VSS using low-inductance capacitor(s) mounted

very close to the device. Lead lengths on the capacitor(s) should be minimized. (The very fast switching

speed of the device causes current spikes on the power leads.)

VSS

Most Negative Supply Potential (Pin 12)

This pin is usually ground. For measurement purposes, the VSS pin is tied to a ground plane.

Power Up

ENB

CLK

123

12345

4 or More Clocks

Din

Don't Cares

Zeroes

One Zero

Don't Cares

Figure 15. Reset Sequence

NOTES: This initialization sequence is usually not necessary because the on-chip power-on reset circuit performs the

initialization function. However, this initialization sequence must be used immediately after power up if control of the CLK

pin is not possible. That is, if CLK (Pin 7) toggles or floats upon power up, use the above sequence to reset the device.

Also, use this sequence if power is momentarily interrupted such that the supply voltage to the device is reduced to

below 2.7 V, but not down to at least 1 V (for example, the supply drops down to 2 V). This is necessary because the

on-chip power-on reset is only activated when the supply ramps up from a voltage below approximately 1.0 V.

MC145170-2 Technical Data, Rev. 5

14

Freescale Semiconductor

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