10–2
Chapter 10: Replacing Serial EEPROMs with MAX II User Flash Memory
List of Vendors and Devices
The differences between the UFM block and serial EEPROMs that you should
consider in your integration of serial EEPROM applications are the sector-based erase
and erase/reprogram cycles. Serial EEPROMs support byte wide erase, which is
automatically implemented during a byte write sequence. The UFM block supports
byte writes, but does not support byte erase requiring a sector-based erase sequence
prior to any programming or writing. If the data content of a specific byte location
needs to be overwritten in the UFM, the entire sector that byte resides in must be
erased unless that byte location was already erased (all 1s). For programming
7
endurance, the UFM erase/reprogram cycles do not meet the 10 and greater cycles
seen in serial EEPROMs.
f
Refer to the DC and Switching Characteristics chapter in the MAX II Device Handbook for
the MAX II UFM block erase/programming endurance specification.
List of Vendors and Devices
Table 10–2 through Table 10–10 list the vendors and their devices which can be
replaced by the MAX II UFM block. The operating condition range for the UFM block
and MAX II devices are within the range of the devices listed.
Table 10–2. Asahi Kasei Microsystems Co. Device Characteristics
Interface
3-
Operating
Voltage (V)
(1)
Size
1-
2-
fMAX
2
Type
Device
(Bits)
SCI
—
—
v
v
—
—
—
v
v
—
—
—
—
v
v
—
Wire Wire Wire
I C
Microwire (MHz)
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
AK93C75AV
AK93C75BH
AK6480AF/M
AK6480BH/L
AK93C65AF/V
AK93C65BH
AK93C61AV
AK6440AF/M
AK6440BH/L
AK6004AF
8,192
8,192
8,192
8,192
4,096
4,096
4,096
4,096
4,096
4,096
2,048
2,048
2,048
2,048
2,048
2,048
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
v
—
—
—
—
—
v
v
v
—
—
v
v
v
—
—
—
v
v
v
—
—
—
—
—
1
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
0.9 to 3.6
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
0.9 to 3.6
1.8 to 5.5
1.8 to 5.5
1.8 to 5.5
1
—
—
—
1
1
—
—
—
—
1
AK93C55AF/V
AK93C55BH
AK93C51AV
AK6420AF/M
AK6420BH
1
AK6003AV
—
Note to Table 10–2:
(1) The MAX II device supports two different VCCINT of operating voltage ranges, which are 2.375 to 2.625 V, and
3.0 to 3.6 V; the MAX IIG device supports the 1.71 to 1.89 V operating voltage range.
MAX II Device Handbook
© October 2008 Altera Corporation