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PDF ( 数据手册 , 数据表 ) X76F640H-2.7

零件编号 X76F640H-2.7
描述 Secure SerialFlash
制造商 Xicor
LOGO Xicor LOGO 


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X76F640H-2.7 数据手册, 描述, 功能
64K
X76F640
8Kx8+32x8
Secure SerialFlash
FEATURES
• 64-bit Password Security
—Five 64-bit Passwords for Read, Program
and Reset
• 8192 Byte+32 Byte Password Protected Arrays
—Seperate Read Passwords
—Seperate Write Passwords
—Reset Password
• Programmable Passwords
• Retry Counter Register
—Allows 8 tries before clearing of both arrays
—Password Protected Reset
• 32-bit Response to Reset (RST Input)
• 32 byte Sector Program
• 400kHz Clock Rate
• 2 wire Serial Interface
• Low Power CMOS
—2.7 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
—SmartCard Module
DESCRIPTION
The X76F640 is a Password Access Security Supervisor,
containing one 65536-bit Secure SerialFlash array and
one 256-bit Secure SerialFlash array. Access to each
memory array is controlled by two 64-bit passwords.
These passwords protect read and write operations of
the memory array. A separate RESET password is used
to reset the passwords and clear the memory arrays in
the event the read and write passwords are lost.
The X76F640 features a serial interface and software
protocol allowing operation on a popular two wire bus.
The bus signals are a clock Input (SCL) and a bidirec-
tional data input and output (SDA). Access to the device
is controlled through a chip select (CS) input, allowing
any number of devices to share the same bus.
The X76F640 also features a synchronous response to
reset providing an automatic output of a hard-wired 32-bit
data stream conforming to the industry standard for
memory cards.
The X76F640 utilizes Xicor’s proprietary Direct WriteTM
cell, providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
Functional Diagram
CS
SCL
SDA
INTERFACE
LOGIC
RST
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
7025-1.4 3/24/97 T2/C0/D1 SH
CHIP ENABLE
DATA TRANSFER
ARRAY ACCESS
ENABLE
PASSWORD ARRAY
AND PASSWORD
VERIFICATION LOGIC
RESET
RESPONSE REGISTER
1
8K BYTE
SerialFlash ARRAY
ARRAY 0
(PASSWORD PROTECTED)
32 BYTE
SerialFlash ARRAY
ARRAY 1
(PASSWORD PROTECTED)
RETRY COUNTER
7025 FM 01
Characteristics subject to change without notice







X76F640H-2.7 pdf, 数据表
X76F640
Figure 7. Sequential Read
SDA S
COMMAND
If ACK, then
Password Matches
ACK POLLING
COMMAND
S
Read
Password
7
Read
Password
0
Wait tWC
OR
Repeated
ACK Polling
Command
Data 0
Data X
S
7025 FM 12
PASSWORDS
The sequence in Figure 8 shows how to change (pro-
gram) the passwords. The programming of passwords is
done twice prior to the nonvolatile write cycle in order to
verify that the new password is consistent. After the eight
bytes are entered in the second pass, a comparison
takes place. A mismatch will cause the part to reset and
enter into the standby mode.
Data ACK polling can be used to determine if a password
has been loaded correctly, however the data ACK com-
mand must be issued less than 2ms after the stop bit.
Figure 8. Change Passwords
SDA S
COMMAND
Old
Password
7
After this time, it cannot be determined if the password
has been loaded correctly, without trying the new pass-
word. To determine if the new password has been loaded
correctly the data ACK polling command is issued imme-
diately following the stop bit. If it returns an ACK, then the
two passes of the new password entry do not match. If it
returns a "no ACK" then the passwords match and a high
voltage cycle is in progress. The high voltage cycle is
complete when a subsequent data ACK command
returns an "ACK".
There is no way to read any of the passwords.
Old
Password
0
Wait tWC
OR
Repeated
ACK Polling
Command
If ACK, then
Password Matches
ACK POLLING
COMMAND
S
Two bytes of “0”
New
Password
7
New
Password
0
New
Password
7
8
Password
0
Data ACK
Polling
If immediate ACK,
S then New Password error
If immediate NACK,
followed by ACK after ~5ms
then New Password OK
7025 FM 13







X76F640H-2.7 equivalent, schematic
X76F640
SMART CARD TYPE Y
3° MAX.
DRAFT ANGLE
(ALL AROUND)
R. 0.125
(3.18) (4x)
0.593 ± 0.002
(15.06 ± 0.05)
3.369 ± 0.002
(85.57 ± 0.05)
0.430 ± 0.002
(10.92 ± 0.05)
0.475 ± 0.010
(12.07 ± 0.25)
A
A
R. 0.030 (0.76) (4x)
2.125 ± 0.002
(53.98 ± 0.05)
0.31 ± 0.0005
(.079 ± 0.0127)
MOLD GATE DETAIL
SECTION A-A
SCALE: 5x
0.478 ± 0.002
(12.14 ± 0.05)
NOTES:
1. ALL DIMENSIONS ARE IN INCHES AND (MILLIMETERS).
2. MATERIAL: WHITE PVC MOLDED PLASTIC WITH ANTI-STATIC ADDITIVE.
3. SURFACE FINISH SUITABLE FOR OFFSET PRINTING.
3003 ILL 02.1
16










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