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1997 Microchip Technology Inc.

Preliminary

DS21209A-page 1
M

93LC66A/B

FEATURES

• Single supply with operation down to 2.5V
• Low power CMOS technology
- 1 mA active current (typical)
-1 m

A standby current (maximum)
• 512 x 8 bit organization (93LC66A)
• 256 x 16 bit organization (93LC66B)
• Self-timed ERASE and WRITE cycles
(including auto-erase)
• Automatic ERAL before WRAL
• Power on/off data protection circuitry
• Industry standard 3-wire serial interface
• Device status signal during ERASE/WRITE cycles
• Sequential READ function
• 1,000,000 E/W cycles guaranteed
• Data retention > 200 years
• 8-pin PDIP/SOIC and 8-pin TSSOP packages
• Available for the following temperature ranges:

BLOCK DIAGRAM
DESCRIPTION

The Microchip Technology Inc. 93LC66A/B are 4K-bit,
low voltage serial Electrically Erasable PROMs. The
device memory is configured as x8 (93LC66A) or
x16 bits (93LC66B). Advanced CMOS technology
makes these devices ideal for low power nonvolatile
memory applications. The 93LC66A/B is available in
standard 8-pin DIP, surface mount SOIC, and TSSOP
packages. The 93LC66AX/BX are only offered in a 150-
mil SOIC package.

PACKAGE TYPE

- Commercial (C): 0



C to +70



C
- Industrial (I): -40



C to +85



C
Vcc
Vss
DI
CS
CLK
DO
MEMORY
ARRAY
ADDRESS
DECODER
ADDRESS
COUNTER
DATA
REGISTER
OUTPUT
BUFFER
MODE
DECODE
CLOCK
GENERATOR
LOGIC
93LC66A/B
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
Vcc
NC
NC
Vss
CS
CLK
DI
DO
VCC
NC
NC
Vss
93LC66A/B
NU
Vcc
CS
CLK
NC
Vss
DO
DI
93LC66A/BX
93LC66A/B
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
Vcc
NC
NC
Vss
TSSOPSOICSOIC
1
2
3
4
DIP
8
7
6
5
1
2
3
4
8
7
6
5

4K 2.5V Microwire



Serial EEPROM

Microwire is a registered trademark of Motorola.