Z85C3008VSG Zilog, Z85C3008VSG Datasheet - Page 288
Z85C3008VSG
Manufacturer Part Number
Z85C3008VSG
Description
IC 8MHZ Z8500 CMOS SCC 44-PLCC
Manufacturer
Zilog
Series
SCCr
Specifications of Z85C3008VSG
Processor Type
Z80
Features
Error Detection and Multiprotocol Support
Speed
8MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
44-LCC (J-Lead)
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Cpu Speed
8MHz
Digital Ic Case Style
LCC
No. Of Pins
44
Supply Voltage Range
5V
Operating Temperature Range
0°C To +70°C
Svhc
No SVHC (18-Jun-2010)
Base Number
85
Rohs Compliant
Yes
Clock Frequency
8MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
269-3932
Z85C3008VSG
Z85C3008VSG
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
Z85C3008VSG
Manufacturer:
Zilog
Quantity:
800
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Part Number:
Z85C3008VSG
Manufacturer:
MAX
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UM010901-0601
However, there are several ranges of frequencies where
the reactance is positive; these are the fundamental
(desired frequency of operation), and the third and fifth
mechanical overtones (approximately 3 and 5 times the
fundamental frequency). Since the desired frequency
range in this application is always the fundamental, the
overtones must be suppressed. This is done by reducing
the loop gain at these frequencies. Usually, the amplifier’s
gain roll off, in combination with the crystal parasitics and
load capacitors, is sufficient to reduce gain and prevent
oscillation at the overtone frequencies.
The following parameters are for an equivalent circuit of a
quartz crystal (Figure 4):
L - motional inductance (typ 120 mH @ 4 MHz)
C - motional capacitance (typ .01 pf @ 4 MHz)
R - motional resistance (typ 36 ohm @ 4 MHz)
Cs - shunt capacitance resulting from the sum of the
capacitor formed by the electrodes (with the quartz as a
dielectric) and the parasitics of the contact wires and
holder (typ 3 pf @ 4 MHz).
The series resonant frequency is given by:
* fs - fp is very small (approximately 300 parts per million)
Z
0
Figure 3. Series vs. Parallel Resonance
CAPACITIVE
INDUCTIVE
Region of Parallel
Operation
Fs = 1/(2 x sqrt of LC),
Thus, they cancel each other and the crystal is then R
shunted by Cs with zero phase shift.
The parallel resonant frequency is given by:
Fp = 1/[2 x sqrt of L (C Ct/C+Ct)],
where Xc and Xl are equal.
where: Ct = C
fs
fp*
Figure 4. Quartz Oscillator
Symbolic Representation
Quartz Equivalent Circuit
L
R
+ C
S
Cs
L
On-Chip Oscillator Design
2
C
Application Note
6-153
1
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