參數(shù)資料
型號(hào)： 5962-8852502UX
廠商： ATMEL CORP
元件分類： PROM
英文描述： 32K X 8 EEPROM 5V, 300 ns, PGA28
封裝： PGA-28
文件頁(yè)數(shù)： 22/27頁(yè)
文件大小： 649K
代理商： 5962-8852502UX
4
0006K–PEEPR–01/08
AT28C256
4.5
Toggle Bit
In addition to DATA Polling the AT28C256 provides another method for determining the end of a
write cycle. During the write operation, successive attempts to read data from the device will
result in I/O6 toggling between one and zero. Once the write has completed, I/O6 will stop tog-
gling and valid data will be read. Reading the toggle bit may begin at any time during the write
cycle.
4.6
Data Protection
If precautions are not taken, inadvertent writes may occur during transitions of the host system
power supply. Atmel has incorporated both hardware and software features that will protect the
memory against inadvertent writes.
4.6.1
Hardware Protection
Hardware features protect against inadvertent writes to the AT28C256 in the following ways: (a)
V
CC sense – if VCC is below 3.8V (typical) the write function is inhibited; (b) VCC power-on delay –
once V
CC has reached 3.8V the device will automatically time out 5 ms (typical) before allowing
a write; (c) write inhibit – holding any one of OE low, CE high or WE high inhibits write cycles;
and (d) noise filter – pulses of less than 15 ns (typical) on the WE or CE inputs will not initiate a
write cycle.
4.6.2
Software Data Protection
A software controlled data protection feature has been implemented on the AT28C256. When
enabled, the software data protection (SDP), will prevent inadvertent writes. The SDP feature
may be enabled or disabled by the user; the AT28C256 is shipped from Atmel with SDP
disabled.
SDP is enabled by the host system issuing a series of three write commands; three specific
bytes of data are written to three specific addresses (refer to “Software Data Protection” algo-
rithm). After writing the 3-byte command sequence and after t
WC the entire AT28C256 will be
protected against inadvertent write operations. It should be noted, that once protected the host
may still perform a byte or page write to the AT28C256. This is done by preceding the data to be
written by the same 3-byte command sequence used to enable SDP.
Once set, SDP will remain active unless the disable command sequence is issued. Power transi-
tions do not disable SDP and SDP will protect the AT28C256 during power-up and power-down
conditions. All command sequences must conform to the page write timing specifications. The
data in the enable and disable command sequences is not written to the device and the memory
addresses used in the sequence may be written with data in either a byte or page write
operation.
After setting SDP, any attempt to write to the device without the 3-byte command sequence will
start the internal write timers. No data will be written to the device; however, for the duration of
t
WC, read operations will effectively be polling operations.
4.7
Device Identification
An extra 64 bytes of EEPROM memory are available to the user for device identification. By rais-
ing A9 to 12V
± 0.5V and using address locations 7FC0H to 7FFFH the additional bytes may be
written to or read from in the same manner as the regular memory array.
4.8
Optional Chip Erase Mode
The entire device can be erased using a 6-byte software code. Please see “Software Chip
Erase” application note for details.
相關(guān)PDF資料
PDF描述
5962-8852505YX 32K X 8 EEPROM 5V, 250 ns, CQCC32
5962-8852512UA 32K X 8 EEPROM 5V, 200 ns, CPGA28
5962-8854503YA 64K X 4 STANDARD SRAM, 55 ns, CDFP28
5962-8855204MA 32K X 8 STANDARD SRAM, 45 ns, CQCC28
5962-8872501XA 256K X 1 STANDARD SRAM, 35 ns, CQCC28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
5962-8852503XA 制造商:Micross Components, Inc. 功能描述:32KX8 EEPROM: 250NS, 28PIN, WIDE CDIP - Bulk
5962-8852503ZC 制造商:Intersil Corporation 功能描述:32K X 8 EEPROM,CMOS,FLAT PACK,883C,250NS - Rail/Tube
5962-8852504XA 制造商:Micross Components, Inc. 功能描述:32KX8 EEPROM: 200NS, 28PIN, WIDE CDIP - Bulk
59628852506UA 制造商:ATMEL 功能描述:AT28C25615UM/883C
5962-8852506XA 制造商:Micross Components, Inc. 功能描述:32KX8 EEPROM: 150NS, 28PIN, WIDE CDIP - Bulk
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