Z8PE003 Datasheet, PDF(27/48 Page) Zilog, Inc. – FEATURE-ENHANCED Z8PLUS 1K ROM ONE-TIME PROGRAMMABLE (OTP) MICROCONTROLLER

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Z8PE003 Datasheet, PDF (27/48 Pages) Zilog, Inc. – FEATURE-ENHANCED Z8PLUS 1K ROM ONE-TIME PROGRAMMABLE (OTP) MICROCONTROLLER

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ZiLOG

VSS

Z8Plus

XTAL1

XTAL2

Z8PE003

Z8Plus OTP Microcontroller

tal/ceramic resonator manufacturer. The RD can be in-

creased to decrease the amount of drive from the oscillator

output to the crystal. It can also be used as an adjustment

to avoid clipping of the oscillator signal to reduce noise. The

RF can be used to improve the start-up of the crystal/ceramic

resonator. The Z8Plus oscillator already locates an internal

shunt resistor in parallel to the crystal/ceramic resonator.

Figure 16. Crystal/Ceramic Resonator Oscillator

XTAL1

Z8Plus

VSS

N/C

XTAL2

XTAL1

L Z8Plus

VSS

XTAL2

Figure 17. LC Clock

In most cases, the RD is 0 Ohms and RF is infinite. These

specifications are determined and specified by the crys-

Figure 18. External Clock

Figure 16, Figure 17, and Figure 18 recommend that the

load capacitor ground trace connect directly to the VSS

(GND) pin of the Z8Plus. This requirement assures that no

system noise is injected into the Z8Plus clock. This trace

should not be shared with any other components except at

the VSS pin of the Z8Plus.

Note: A parallel-resonant crystal or resonator manufacturer

specifies a load capacitor value that is a series combination

of C1 and C2, including all parasitics (PCB and holder).

DS007500-Z8X0399

PRELIMINARY

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