M
FEATURES
93LC66A/B
BLOCK DIAGRAM
MEMORY
ARRAY
ADDRESS
DECODER
4K 2.5V Microwire
®
Serial EEPROM
• Single supply with operation down to 2.5V
• Low power CMOS technology
- 1 mA active current (typical)
- 1
µ
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:
- Commercial (C):
0
°
C to +70
°
C
- Industrial (I):
-40
°
C to +85
°
C
ADDRESS
COUNTER
DATA
REGISTER
DI
MODE
DECODE
LOGIC
CLOCK
GENERATOR
Vcc
Vss
OUTPUT
BUFFER
DO
CS
CLK
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
DIP
CS
CLK
DI
DO
1
8
Vcc
CS
7
6
5
NC
CLK
NC
Vss
DO
DI
SOIC
SOIC
CS
CLK
DI
DO
1
2
3
4
TSSOP
93LC66A/B
8
7
6
5
Vcc
NC
NC
Vss
1
2
3
4
8
7
6
5
V
CC
NC
NC
Vss
NU
Vcc
CS
CLK
1
2
3
4
8
7
6
5
93LC66A/BX
NC
Vss
DO
DI
93LC66A/B
93LC66A/B
2
3
4
Microwire is a registered trademark of Motorola.
©
1997 Microchip Technology Inc.
Preliminary
DS21209A-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
