CAT35C804A Datasheet, PDF (14/14 Pages) Catalyst Semiconductor – 4K-Bit Secure Access Serial E2PROM

CAT35C804A
Preliminary
WRAL Write All
1000 1001
1100 0011 [D15–D8] [D7–D0] (x16 organization)
1000 1001
1100 0011 [D7–D0] (x8 organization)
Write one or two bytes of data to all memory locations.
An ERAL will be automatically performed before the
WRAL is executed. For protection against inadvertent
clearing or writing of data, the ERAL instruction is
required to be entered preceding the WRAL instruction.
RSEQ Read Sequentially
1100 1011 [A15–A8] [A7–A0] (x8 organization)
1100 1011 [A7–A0] (x16 organization)
Read memory starting from specified address, sequen-
tially to the highest address or until CS goes LOW. The
instruction is terminated when CS goes LOW.
ENBSY Enable Busy
1000 0100
Enable the status indicator on DO during program/erase
cycle. DO goes LOW then HIGH once the write cycle is
complete. DO will go to HIGH-Z at the end of the next op
code transmission.
DISBSY Disable Busy
1000 0101
Disable the status indicator on DO during program/
erase cycle.
EWEN Program/Erase Enable
ORDERING INFORMATION
Prefix Device #
Suffix
CAT
35C804A
J
1000 0001
Enable program/erase to be performed on non-pro-
tected portion of memory. This instruction must be
entered before any program/erase instruction will be
carried out. Once entered, it will remain valid until power-
down or an EWDS (Program/Erase Disable) is ex-
ecuted.
EWDS Program/Erase Disable
1000 0010
Disable all write and clear functions.
ORG Select Memory Organization
1000 011R (where R = 0 or 1)
Set memory organization to 512 x 8 if R = 0.
Set memory organization to 256 x 16 if R = 1.
RSR Read Status Register
1100 1000
Output the contents of the 8-bit status register. The
contents of the first three bits of the register are 101,
which allows the user to quickly determine whether the
device is listening or is in an error condition. The next
three bits indicate parity error, instruction error and RDY/
BUSY status. The last two bits are reserved for future
use.
NOP No Operation
1000 0000
No Operation.
I
-TE13
Optional
Company ID
Product
Number
Temperature Range
Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
A = Automotive (-40˚ to +105˚C)*
Tape & Reel
TE13: 2000/Reel
Package
P: PDIP
J: SOIC (JEDEC)
* -40˚C to +125˚C is available upon request
Notes:
(1) The device used in the above example is a 35C804AJI-TE13 (SOIC, Industrial Temperature, Tape & Reel)
Doc. No. 25043-00 2/98
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33C804 F19