 2003 Microchip Technology Inc. DS21795B-page 1
93AA66A/B/C, 93LC66A/B/C,
93C66A/B/C
Device Selection Table
Features
• Low-power CMOS technology
ORG pin to select word size for ‘66C version
512 x 8-bit organization ‘A’ ver. devices (no ORG)
256 x 16-bit organization ‘B’ ver. devices (no
ORG)
Self-timed ERASE/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 (READY/BUSY)
Sequential READ function
1,000,000 E/W cycles
Data retention > 200 years
Temperature ranges supported:
Pin Function Table
Description
The Microchip Technology Inc. 93XX66A/B/C devices
are 4K bit low voltage serial Electrically Erasable
PROMs (EEPROM). Word-selectable devices such as
the 93AA66C, 93LC66C or 93C66C are dependent
upon external logic levels driving the ORG pin to set
word size. For dedicated 8-bit communication, the
93AA66A, 93LC66A or 93C66A devices are available,
while the 93AA66B, 93LC66B and 93C66B devices
provide dedicated 16-bit communication. Advanced
CMOS technology makes these devices ideal for low
power, non-volatile memory applications. The entire
93XX Series is available in standard packages includ-
ing 8-lead PDIP and SOIC, and advanced packaging
including 8-lead MSOP, 6-lead SOT-23, and 8-lead
TSSOP. Pb-free (Pure Matte Sn) finish is also
available.
Package Types (not to scale)
Part Number VCC Range ORG Pin Word Size Temp Ranges Packages
93AA66A 1.8-5.5 No 8-bit I P, SN, ST, MS, OT
93AA66B 1.8-5-5 No 16-bit I P, SN, ST, MS, OT
93LC66A 2.5-5.5 No 8-bit I, E P, SN, ST, MS, OT
93LC66B 2.5-5.5 No 16-bit I, E P, SN, ST, MS, OT
93C66A 4.5-5.5 No 8-bit I, E P, SN, ST, MS, OT
93C66B 4.5-5.5 No 16-bit I, E P, SN, ST, MS, OT
93AA66C 1.8-5.5 Yes 8 or 16-bit I P, SN, ST, MS
93LC66C 2.5-5.5 Yes 8 or 16-bit I, E P, SN, ST, MS
93C66C 4.5-5.5 Yes 8 or 16-bit I, E P, SN, ST, MS
- Industrial (I) -40°C to +85°C
- Automotive (E) -40°C to +125°C
Name Function
CS Chip Select
CLK Serial Data Clock
DI Serial Data Input
DO Serial Data Output
VSS Ground
NC No internal connection
ORG Memory Configuration
VCC Power Supply
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
VCC
NC
ORG*
VSS
PDIP/SOIC
(P, SN)
CS
CLK DI
DO
1
2
3
4
8
7
6
5
VCC
NC
ORG*
VSS
ROTATED SOIC
(ex: 93LC66BX)
TSSOP/MSOP
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
VCC
NC
ORG*
VSS
(ST, MS)
SOT-23
DO
VSS
DI
1
2
3
6
5
4
VCC
CS
CLK
(OT)
* ORG pin is NC on A/B devices
4K Microwire Compatible Serial EEPROM