Z85C3008VSG Zilog, Z85C3008VSG Datasheet - Page 293

• 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

Application Note
On-Chip Oscillator Design
Output Level. The signal at the amplifier output should
swing from ground to V
gain in the amplifier. As the oscillator starts up, the signal
amplitude grows until clipping occurs, at which point, the
6-158
PRACTICE: CIRCUIT ELEMENT AND LAY OUT CONSIDERATIONS (Continued)
Must Be Avoided)
(Parallel Traces
Signal C
C L
C
L
CC
Signals A B
EXTAL
. This indicates there is adequate
XTAL
Clock Generator Circuit
2
3
2
3
Z80180
Figure 9. Circuit Board Design Rules
Z80180
64
64
loop gain is effectively reduced to unity and constant
oscillation is achieved. A signal of less than 2.5 Vp-p is an
indication that low gain may be a problem. Either C1/C2
should be made smaller or a low R crystal should be used.
To prevent induced noice, the crystal and load
capacitors should be physically located as
close to the LSI as possible.
Signal lines should not run parallel to the clock
oscillator inputs. In particullar, the clock input
circuitry and the system clock output (pin 64)
should be separated as much as possible.
V
clock oscillator input circuitry.
Resistivity between XTAL or EXTAL and the
other pin should be greater than 10 M
cc
power lines should be separated from the
Board Design Example
1
2
3
(Top View)
20 mm
Z80180
max
GND
64
Layout Should
Lighted Areas
Signal Line
Avoid High
20 mm max
CLK
UM010901-0601