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CAT28C64BGI90

P1-P3P4-P6P7-P9P10-P12P13-P13
CAT28C64B
10
Doc. No. MD-1011, Rev. I
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
SOFTWARE DATA
PROTECTION ACTIVATED
(1)
WRITE DATA: XX
WRITE LAST BYTE
TO
LAST ADDRESS
TO ANY ADDRESS
WRITE DATA: AA
ADDRESS: 1555
WRITE DATA: 55
ADDRESS: 0AAA
WRITE DATA: A0
ADDRESS: 1555
Note:
(1) Write protection is activated at this point whether or not any more writes are completed. Writing to addresses must occur within t
BLC
Max., after SDP activation.
HARDWARE DATA PROTECTION
The following is a list of hardware data protection features
that are incorporated into the CAT28C64B.
(1) V
CC
sense provides for write protection when V
CC
falls below 3.5V min.
(2) A power on delay mechanism, t
INIT
(see AC
characteristics), provides a 5 to 10 ms delay before
a write sequence, after V
CC
has reached 3.5V min.
(3) Write inhibit is activated by holding any one of OE
low, CE high or WE high.
(4) Noise pulses of less than 20 ns on the WE or CE
inputs will not result in a write cycle.
SOFTWARE DATA PROTECTION
The CAT28C64B features a software controlled data
protection scheme which, once enabled, requires a data
algorithm to be issued to the device before a write can be
performed. The device is shipped from Catalyst with the
software protection NOT ENABLED (the CAT28C64B is
in the standard operating mode).
Figure 9. Write Sequence for Activating Software
Data Protection
Figure 10. Write Sequence for Deactivating
Software Data Protection
WRITE DATA: AA
ADDRESS: 1555
WRITE DATA: 55
ADDRESS: 0AAA
WRITE DATA: 80
ADDRESS: 1555
WRITE DATA: AA
ADDRESS: 1555
WRITE DATA: 55
ADDRESS: 0AAA
WRITE DATA: 20
ADDRESS: 1555
CAT28C64B
11
Doc. No. MD-1011, Rev. I
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
To activate the software data protection, the device must
be sent three write commands to specific addresses with
specific data (Figure 9). This sequence of commands
(along with subsequent writes) must adhere to the page
write timing specifications (Figure 11). Once this is done,
all subsequent byte or page writes to the device must be
preceded by this same set of write commands. The data
protection mechanism is activated until a deactivate
sequence is issued regardless of power on/off transitions.
This gives the user added inadvertent write protection
on power-up in addition to the hardware protection
provided.
To allow the user the ability to program the device with
an EEPROM programmer (or for testing purposes) there
is a software command sequence for deactivating the
data protection. The six step algorithm (Figure 10) will
reset the internal protection circuitry, and the device will
return to standard operating mode (Figure 12 provides
reset timing). After the sixth byte of this reset sequence
has been issued, standard byte or page writing can
commence.
Figure 11. Software Data Protection Timing
CE
WE
t
WP
AA
1555
55
0AAA
A0
1555
DATA
ADDRESS
t
BLC
t
WC
BYTE OR
PAGE
WRITES
ENABLED
Figure 12. Resetting Software Data Protection Timing
CE
WE
AA
1555
55
0AAA
DATA
ADDRESS
t
WC80
1555
AA
1555
55
0AAA
20
1555
SDP
RESET
DEVICE
UNPROTECTED
Speed
90: 90ns
12: 120ns
15: 150ns
CAT28C64B
12
Doc. No. MD-1011, Rev. I
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
EXAMPLE OF ORDERING INFORMATION
(1)
Prefix Device # Suffix
28C64B
Product
Number
CAT
Optional
Company
ID
NI T
Tape & Reel
Package
P: PDIP
(2)
J: SOIC (JEDEC)
(2)
K: SOIC (EIAJ)
(2)
N: PLCC
(2)
-15
Temperature Range
Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
A = Automotive (-40˚ to +105˚C)
(3)
Speed
12: 120ns
15: 150ns
L: PDIP (Lead free, Halogen free)
W: SOIC (JEDEC) (Lead free, Halogen free)
X: SOIC (EIAJ) (Lead free, Halogen free)
G: PLCC (Lead free, Halogen free)
H13: TSOP (8mmx13.4mm) (Lead free, Halogen free)
90: 90ns
ORDERING INFORMATION
Notes:
(1) The device used in the above example is a CAT28C64BNI-15T (PLCC, Industrial temperature, 150 ns Access Time, Tape & Reel).
(2) Solder-plate (tin-lead) packages, contact Factory for availability.
(3) -40°C to +125°C is available upon request.
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T21-IGB46C82TAC21ALB46C82TAC
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T09-IGB46C82TAC09ALB46C82TAC
T21-AGB46C82TACT21-IWB46C82TAC
T51-AGB46C82TACT51-IWB46C82TAC
T09-AGB46C82TACT09-IWB46C82TAC
T21I31HB46C82TACT21-AWB46C82TAC
T51I31HB46C82TACT51-AWB46C82TAC
T09I31HB46C82TACT09-AWB46C82TAC
T21A31HB46C82TACT21-IXB46C82TAC
T51A31HB46C82TACT51-IXB46C82TAC
T09A31HB46C82TACT09-IXB46C82TAC
21ILB46C82TACT21-AXB46C82TAC
51ILB46C82TACT51-AXB46C82TAC
09ILB46C82TACT09-AXB46C82TAC
P1-P3P4-P6P7-P9P10-P12P13-P13

CAT28C64BGI90

Mfr. #:
Buy CAT28C64BGI90
Manufacturer:
ON Semiconductor
Description:
EEPROM (8kx8) 64K 5V 90ns
Lifecycle:
New from this manufacturer.
Delivery:
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