EPM7256BTC144-5 Altera, EPM7256BTC144-5 Datasheet - Page 26

• Manufacturer Part Number: EPM7256BTC144-5
• Description: MAX 7000/S/AE/B
• Manufacturer: Altera

MAX 7000B Programmable Logic Device Data Sheet
PCI
Compatibility
26
Two inverters implement the bus-hold circuitry in a loop that weakly
drives back to the I/O pin in user mode.
Figure 10
Figure 10. Bus-Hold Circuit
MAX 7000B devices are compatible with PCI applications as well as all
3.3-V electrical specifications in the PCI Local Bus Specification
Revision 2.2 except for the clamp diode. While having multiple clamp
diodes on a signal trace may be redundant, designers can add an external
clamp diode to meet the specification.
device speed grades that meet the PCI timing specifications.
Note:
(1)
Table 13. MAX 7000B Device Speed Grades that Meet PCI Timing
Specifications
EPM7032B
EPM7064B
EPM7128B
EPM7256B
EPM7512B
The EPM7256B and EPM7512B devices in a -5 speed grade meet all PCI timing
specifications for 66-MHz operation except the Input Setup Time to CLK—Bused
Signal parameter. However, these devices are within 1 ns of that parameter.
EPM7256B and EPM7512B devices meet all other 66-MHz PCI timing
specifications.
Device
shows a block diagram of the bus-hold circuit.
Bus Hold Circuit
All speed grades
All speed grades
All speed grades
All speed grades
All speed grades
33-MHz PCI
Drive to
VCCIO level
Table 13
Specification
R
BH
shows the MAX 7000B
I/O
Altera Corporation
66-MHz PCI
-3
-3
-4
-5
-5
(1)
(1)