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1997 Microchip Technology Inc. DS11168L-page 1
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93LC46/56/66

FEATURES

• Single supply with programming operation down
to 2.0V (Commercial only)
• Low power CMOS technology
- 1 mA active current typical
-5

mA standby current (typical) at 3.0V
• ORG pin selectable memory configuration
- 128 x 8 or 64 x 16-bit organization (93LC46)
- 256 x 8 or 128 x 16-bit organization(93LC56)
- 512 x 8 or 256 x 16-bit organization(93LC66)
• Self-timed ERASE and WRITE cycles
(including auto-erase)
• Automatic ERAL before WRAL
• Power on/off data protection circuitry
• Industry standard 3-wire serial I/O
• Device status signal during ERASE/WRITE cycles
• Sequential READ function
• 10,000,000 ERASE/WRITE cycles guaranteed on
93LC56 and 93LC66
• 1,000,000 E/W cycles guaranteed on 93LC46
• Data retention > 200 years
• 8-pin PDIP/SOIC and 14-pin SOIC package
(SOIC in JEDEC and EIAJ standards)
• Temperature ranges supported

BLOCK DIAGRAM
DESCRIPTION

The Microchip Technology Inc. 93LC46/56/66 are 1K,
2K, and 4K low-voltage serial Electrically Erasable
PROMs. The device memory is configured as x8 or x16
bits, depending on the ORG pin setup. Advanced
CMOS technology makes these devices ideal for
low-power, nonvolatile memory applications. The
93LC46/56/66 is available in standard 8-pin DIP and 8/
14-pin surface mount SOIC packages. The 93LC46X/
56X/66X are only offered in an “SN” package.

PACKAGE TYPES

- Commercial (C): 0



C to +70



C
- Industrial (I): -40



C to +85



C
MEMORY
ARRAY
ADDRESS
DECODER
VCC VSS
DATA REGISTER DO
MODE
DECODE
LOGIC
CLOCK
GENERATOR
OUTPUT
BUFFER
DI
CS
CLK
ADDRESS
COUNTER
DIP
SOIC
93LC4693LC5693LC66 93LC4693LC5693LC66 93LC46X93LC56X93LC66X
93LC5693LC66
SOIC
SOIC
CS
CLK
DI
DO
VCC
NU
ORG
VSS
NU
VCC
CS
CLK
ORG
VSS
DO
DI
CS
CLK
DI
DO
VCC
NU
ORG
VSS
NC
CS
CLK
NC
NC
Vcc
NU
NC
DI
DO
NC
ORG
VSS
NC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
1
2
3
4
14
13
12
11
5
6
7
10
9
8

1K/2K/4K 2.0V Microwire

®

Serial EEPROM