93LCS56 Datasheet, PDF (3/12 Pages) Microchip Technology – 2K/4K 2.5V Microwire Serial EEPROM with Software Write Protect

93LCS56/66
TABLE 1-2: DC AND AC ELECTRICAL CHARACTERISTICS (Continued)
VCC = +2.5V to +6.0V
Commercial(C): Tamb = 0˚C to +70˚C
Industrial (I): Tamb = -40˚C to +85˚C
Parameter
Symbol
Min
Max
Units
Conditions
Status valid time
TSV
500
ns
CL=100 pF
Program cycle time
TWC
10
ms
ERASE/WRITE mode (Note 3)
TEC
15
ms
ERAL mode
TWL
30
ms
WRAL mode
Endurance
—
1M
—
cycles 25°C, Vcc = 5.0V, Block Mode
(Note 4)
3: Typical program cycle time is 4 ms per word.
4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific appli-
cation, please consult the Total Endurance Model which can be obtained on our BBS or website.
TABLE 1-3: INSTRUCTION SET FOR 93LCS56*/66
93LCS56/66 (x 16 organization)
Instruction SB Opcode Address Data In Data Out PRE PE
Comments
READ
EWEN
ERASE
ERAL
WRITE
1
10
A7 - A0
—
D15-D0 0 X Reads data stored in memory, start-
ing at specified address (.Note).
1
00
11XXXXXX
—
High-Z 0 1 Erase/Write Enable must precede all
programming modes.
1
11
A7 - A0
—
(RDY/
BSY)
1 Erase data at specified address
location if address is unprotected
(Note).
1
00 10XXXXXX
—
(RDY/
BSY)
0 1 Erase all registers to “FF”. Valid only
when Protect Register is cleared.
1
01
A7 - A0*
D15 - D0 (RDY/
BSY)
0 1 Writes register if address is unpro-
tected.
WRAL
EWDS
1
00
01XXXXXX D15 - D0 (RDY/
BSY)
1
00 00XXXXXX
—
High-Z
PRREAD 1
10 XXXXXXXX
—
A7-A0
PREN
1
00
11XXXXXX
—
High-Z
PRCLEAR 1
11
11111111
—
(RDY/
BSY)
PRWRITE 1
01
A7 - A0*
—
(RDY/
BSY)
PRDS
1
00
00000000
—
(RDY/
BSY)
Note: Address A7 bit is a “don’t care” on 93LCS56.
0 1 Writes all registers. Valid only when
Protect Register is cleared.
0 X Erase/Write Disable deactivates all
programming instructions.
1 X Reads address stored in Protect
Register.
1 1 Must immediately precede
PRCLEAR, PRWRITE and PRDS
instructions.
1 1 Clears the Protect Register such that
all data are NOT write-protected.
1 1 Programs address into Protect Reg-
ister. Thereafter, memory addresses
greater than or equal to the address
in Protect Register are write-pro-
tected.
1 1 ONE TIME ONLY instruction after
which the address in the Protect
Register cannot be altered.
© 1996 Microchip Technology Inc.
Preliminary
DS11181D-page 3