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PDF X76F400 Data sheet ( Hoja de datos )
| Número de pieza | X76F400 | |
| Descripción | Secure Serial Flash | |
| Fabricantes | Xicor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de X76F400 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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X76F400
512 x 8 bit
Secure SerialFlash
FEATURES
• 64-bit password security
• One array (496 bytes) two passwords (16 bytes)
—Read password
—Write password
• Programmable passwords
• Retry counter register
—Allows 8 tries before clearing of the array
• 32-bit response to reset (RST input)
• 8 byte sector write mode
• 1MHz clock rate
• 2-wire serial interface
• Low power CMOS
—2.5 to 5.5V operation
—Standby current less than 1µA
—Active current less than 3 mA
• High reliability endurance:
—100,000 write cycles
• Data retention: 100 years
• Available in:
—8-lead, SOIC,TSSOP
DESCRIPTION
The X76F400 is a password access security supervi-
sor, containing one 3968-bit Secure SerialFlash array.
Access to the memory array can be controlled by two
64-bit passwords. These passwords protect read and
write operations of the memory array.
The X76F400 features a serial interface and software
protocol allowing operation on a popular 2-wire bus.
The bus signals are a clock input (SCL) and a bi-direc-
tional data input and output (SDA).
The X76F400 also features a synchronous response
to reset, providing an automatic output of a hard-wired
32-bit data stream, thereby meeting the industry stan-
dard for memory cards.
The X76F400 utilizes Xicor’s proprietary Direct Write™
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
BLOCK DIAGRAM
SCL
SDA
Interface
Logic
RST
www.DataSheet4U.com
REV 1.0 7/5/00
Data Transfer
Array Access
Enable
Password Array
and Password
Verification Logic
ISO Reset
Response Register
Retry Counter
Erase Logic
496 Byte
EEPROM Array
www.DataSheet4U.com
www.xicor.com
Characteristics subject to change without notice. 1 of 14
1 page  
X76F400
After the password sequence, there is always a nonvola-
tile write cycle. This is done to discourage random
guesses of the password if the device is being tampered
with. In order to continue the transaction, the X76F400
requires the master to perform a password ACK polling
sequence with the specific command code of 55h. As
with regular acknowledge polling the user can either
time out for 10ms and then issue the ACK polling once,
or continuously loop as described in the flow.
If the password inserted is correct, the nonvolatile
cycle in response to the password ACK polling
sequence is over, and an “ACK” is returned.
If the password inserted is incorrect, a “no ACK” is
returned, even if the nonvolatile cycle is over. There-
fore, the user cannot be certain that the password is
incorrect until the 10ms write cycle time has elapsed.
Password ACK Polling Sequence
READ OPERATIONS
Read operations are initiated in the same manner as
write operations but with a different command code.
Sector Read
With sector read, a sector address is supplied with the
read command. Once the password has been
acknowledged data may be read from the sector. An
acknowledge must follow each 8-bit data transfer. A
read operation always begins at the first byte in the
sector, but may stop at any time. Random accesses to
the array are not possible. Continuous reading from the
array will return data from successive sectors. After
reading the last sector in the array, the address is auto-
matically set to the first sector in the array and data can
continue to be read out. After the last bit has been
read, a stop condition is generated without sending a
preceding acknowledge.
Password Load
Completed Enter ACK
Polling
Issue START
Issue Password
ACK Command
ACK
Returned?
YES
PROCEED
NO
REV 1.0 7/5/00
www.xicor.com
Characteristics subject to change without notice. 5 of 14
5 Page 
X76F400
GUIDELINES FOR CALCULATING TYPICAL VALUES OF BUS PULL UP RESISTORS
100
80
RMAX
60
40
20 RMIN
20 40 60 80 100
Bus Capacitance in pF
RMIN = V---I--O-C----CL----MM-----IA-N---X--- = 1.8KΩ
RMAX = C-----B-t---R-U-----S--
tR = maximum allowable SDA rise time
REV 1.0 7/5/00
www.xicor.com
Characteristics subject to change without notice. 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet X76F400.PDF ] | |
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