Z84C2008PEG Zilog, Z84C2008PEG Datasheet - Page 50
![IC 8MHZ Z80 CMOS PIO 40-DIP](/photos/6/57/65796/269-40-dip_sml.jpg)
Z84C2008PEG
Manufacturer Part Number
Z84C2008PEG
Description
IC 8MHZ Z80 CMOS PIO 40-DIP
Manufacturer
Zilog
Series
Z80r
Specifications of Z84C2008PEG
Processor Type
Z80
Features
Low Power CMOS
Speed
8MHz
Voltage
5V
Mounting Type
Through Hole
Package / Case
40-DIP (0.620", 15.75mm)
Cpu Speed
8MHz
Digital Ic Case Style
DIP
No. Of Pins
40
Supply Voltage Range
5V
Operating Temperature Range
-40°C To +100°C
Svhc
No SVHC (18-Jun-2010)
Rohs Compliant
Yes
Processor Series
Z84C2xx
Core
Z80
Data Bus Width
8 bit
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
16
Operating Supply Voltage
0 V to 5 V
Maximum Operating Temperature
+ 100 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Base Number
84
Clock Frequency
8MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
Z84C2008PEG
Manufacturer:
Zilog
Quantity:
20
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30
UM008005-0205
Z80 CPU
User’s Manual
Memory Speed Control
Slow memories can reduce costs for many applications. The WAIT line on
the CPU allows the Z80 to operate with any speed memory. Memory access
time requirements, which are covered in Chapter A3, are most severe
during the M1 cycle instruction fetch. All other memory access cycles
complete in an additional one half clock cycle. Hence, it is sometimes
appropriate to add one wait state to the M1 cycle so slower memories can
be used. Figure 19 is an example of a simple circuit that accomplishes this
objective. This circuit can be changed to add a single wait state to any
memory access as indicated in Figure 20.
Figure 19. Adding One Wait State to an M1 Cycle
CLK
M1
D
C
7474
+5V
S
R
Q
Q
D
C
7474
+5V
+5V
Hardware and Software Implementation Examples
S
R
Q
Q
WAIT
WAIT
CLK
M1
T
1
T
2
M1
T
W
T
3
T
4
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