Z85C3008VSG Zilog, Z85C3008VSG Datasheet - Page 30

• 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

UM010901-0601
2.3.2 Z85X30 Write Cycle Timing
The write cycle timing for the Z85X30 is shown in Figure 2-
6. The address on A//B and D//C, as well as the data on
D7-D0, is latched by the coincidence of /WR and /CE ac-
tive. /CE must remain Low and /INTACK must remain High
throughout the cycle. A write cycle with D//C High does not
disturb the state of the pointers and a write cycle with D//C
Low resets the pointers to zero after the internal operation
is complete.
2.3.3 Z85X30 Interrupt Acknowledge Cycle Timing
The interrupt acknowledge cycle timing for the Z85X30 is
shown in Figure 2-7. The state of /INTACK is latched by
A//B, D//C
/INTACK
/INTACK
D7-D0
D7-D0
/CE
/WR
/RD
Note: Dotted line is ESCC only.
Figure 2-7. Z85X30 Interrupt Acknowledge Cycle Timing
Figure 2-6. Z85X30 Write Cycle Timing
See Note
Historically, the NMOS/CMOS version latched the data
bus on the falling edge of /WR. However, many CPUs do
not guarantee that the data bus is valid at the time when
the /WR pin goes low, so the data bus timing was modified
to allow a maximum delay from the falling edge of /WR to
the latching of the data bus. On the Z85230, the AC Timing
parameter #29 TsDW(WR), Write Data to /WR falling min-
imum, has been changed to: /WR falling to Write Data Val-
id maximum. Refer to the AC Timing Characteristic section
of the Z85230 Product Specification for more information
regarding this change.
the rising edge of PCLK (AC Spec #10). While /INTACK is
Low, the state of A//B, /CE, D//C, and /WR are ignored.
Address Valid
Data Valid
Vector
SCC™/ESCC™ User’s Manual
Interfacing the SCC/ESCC
2-11
2