z8pe003 ZiLOG Semiconductor, z8pe003 Datasheet - Page 26

• Manufacturer Part Number: z8pe003
• Description: Feature-enhanced Z8plus 1k Rom One-time Programmable Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

OSCILLATOR OPERATION (Continued)
Z8PE002
Z8Plus OTP Microcontroller
Circuit Board Design Rules
The following circuit board design rules are suggested:
•
•
Crystals and Resonators
Crystals and ceramic resonators (Figure 16) should exhibit
the following characteristics to ensure proper oscillation:
26
Crystal Cut
Mode
Crystal Capacitance
Load Capacitance
Resistance
To prevent induced noise, the crystal and load capaci-
tors should be physically located as close to the
Z8Plus as possible.
Signal lines should not run parallel to the clock oscil-
lator inputs. In particular, the crystal input circuitry
Clock Generator Circuit
Z8Plus
XTAL2
XTAL1
AT (crystal only)
Parallel, fundamental mode
<7pF
10pF < CL < 220 pF,
15 typical
100 Ohms maximum
Z8Plus
XTAL1
XTAL2
17
16
V
SS
Signals A B
16
17
15
Figure 15. Circuit Board Design Rules
must be avoided)
(Parallel traces
Signal C
P R E L I M I N A R Y
C
C
1
2
•
•
Depending on the operation frequency, the oscillator may
require additional capacitors,
Figure 16 and Figure 17. The capacitance values are de-
pendent on the manufacturer’s crystal specifications.
and the internal system clock output should be separat-
ed as much as possible.
V
oscillator input circuitry.
Resistivity between
pins) should be greater than 10 meg-Ohms.
CC
power lines should be separated from the clock
Z8Plus
PB0
X2
V
X1
V
CC
SS
Board Design Example
XTAL1
(Top View)
C
1
or
and
XTAL2
DS008700-Z8X0799
C
2
, as illustrated in
(and the other
ZiLOG