1996 Microchip Technology Inc.

Preliminary

DS11181D-page 1

FEATURES

• Single supply with programming operation down
to 2.5V
• Low power CMOS technology
- 1 mA active current typical
-5

mA standby current (typical) at 3.0V
• x16 memory organization
- 128x16 (93LCS56)
- 256x16 (93LCS66)
• Software write protection of user defined memory
space
• Self timed erase and write cycles
• Automatic ERAL before WRAL
• Power on/off data protection
• Industry standard 3-wire serial I/O
• Device status signal during E/W
• Sequential READ function
• 1,000,000 E/W cycles guaranteed
• Data retention > 200 years
• 8-pin PDIP/SOIC and 14-pin SOIC packages
• Temperature ranges supported
- Commercial (C): 0˚C to +70˚C
- Industrial (I): -40˚C to +85˚C

BLOCK DIAGRAM
DESCRIPTION

The Microchip Technology Inc. 93LCS56/66 are low volt-
age Serial Electrically Erasable PROMs with memory
capacities of 2K bits/4K bits respectively. A write protect
register is included in order to provide a user defined
region of write protected memory. All memory locations
greater than or equal to the address placed in the write
protect register will be protected from any attempted write
or erase operation. It is also possible to protect the
address in the write protect register permanently by using
a one time only instruction (PRDS). Any attempt to alter
data in a register whose address is equal to or greater
than the address stored in the protect register will be
aborted. Advanced CMOS technology makes this device
ideal for low power non-volatile memory applications.
MEMORY
ARRAY
ADDRESS
DECODER
VCC VSS
DATA REGISTER
DO
MODE
DECODE
LOGIC
CLOCK
GENERATOR
OUTPUT
BUFFER
DI
CS
CLK
PRE
ADDRESS
COUNTER
PE
93LCS56/66

2K/4K 2.5V Microwire



Serial EEPROM with Software Write Protect

PACKAGE TYPES
93LCS56
93LCS66
93LCS56
93LCS66
93LCS56
93LCS66
SOIC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
VCC
PRE
NC
PE
VSS
NC
NC
CS
CLK
NC
DI
DO
NC
SOIC
1
2
3
4
8
7
6
5
VCC
PRE
PE
VSS
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
VCC
PRE
PE
VSS
CS
CLK
DI
DO
DIP

Microwire is a registered trademark of National Semiconductor Incorporated.

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