Z16C3516VSG Zilog, Z16C3516VSG Datasheet - Page 247

• Manufacturer Part Number: Z16C3516VSG
• Description: IC 16MHZ Z8500 CMOS ISCC 68-PLCC
• Manufacturer: Zilog
• Series: IUSC™r

Specifications of Z16C3516VSG

• Controller Type: Serial Communications Controller (SCC)
• Interface: USB
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 50mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4690-5; Z16C3516VSG

UM011001-0601
INTRODUCTION
This Application Note (App Note) is written for designers
using Zilog Integrated Circuits with on-chip oscillators;
circuits in which the amplifier portion of a feedback
oscillator is contained on the IC. This App Note covers
common theory of oscillators, and requirements of the
circuitry (both internal and external to the IC) which comes
from the theory for crystal and ceramic resonator based
circuits.
Purpose and Benefits
The purposes and benefits of this App Note include:
OSCILLATOR THEORY OF OPERATION
The circuit under discussion is called the Pierce Oscillator
(Figures 1, 2). The configuration used is in all Zilog on-chip
oscillators. Advantages of this circuit are low power
consumption, low cost, large output signal, low power level
in the crystal, stability with respect to V
and low impedances (not disturbed by stray effects). One
D
esign and build reliable, cost-effective, on-chip oscillator circuits that are trouble free.
PUTTING OSCILLATOR THEORY INTO A PRACTICAL DESIGN MAKES FOR A
MORE DEPENDABLE CHIP.
O
N
-C
CC
HIP
and temperature,
O
SCILLATOR
A
1. Providing designers with greater understanding of how
2. To eliminate field failures and other complications
Problem Background
Inadequate understanding of the theory and practice of
oscillator circuit design, especially concerning oscillator
startup, has resulted in an unreliable design and
subsequent field problems (See on page 10 for reference
materials and acknowledgments).
drawback is the need for high gain in the amplifier to
compensate for feedback path losses.
PPLICATION
oscillators work and how to design them to avoid
problems.
resulting from an unawareness of critical on-chip
oscillator design constraints and requirements.
Figure 1. Basic Circuit and Loop Gain
V i
D
N
ESIGN
OTE
A
B
V o
15-1
14
1