93AA66A/B/C, 93LC66A/B/C,
93C66A/B/C
4K Microwire Compatible Serial EEPROM
Device Selection Table
Part Number
VCC Range
ORG Pin
Word Size
Temp Ranges
Packages
93AA66A
93AA66B
93LC66A
93LC66B
93C66A
1.8-5.5
1.8-5-5
2.5-5.5
2.5-5.5
4.5-5.5
4.5-5.5
1.8-5.5
2.5-5.5
4.5-5.5
No
No
8-bit
16-bit
I
P, SN, ST, MS, OT
P, SN, ST, MS, OT
P, SN, ST, MS, OT
P, SN, ST, MS, OT
P, SN, ST, MS, OT
P, SN, ST, MS, OT
P, SN, ST, MS
I
No
8-bit
I, E
I, E
I, E
I, E
I
No
16-bit
No
8-bit
93C66B
No
16-bit
93AA66C
93LC66C
93C66C
Yes
Yes
Yes
8 or 16-bit
8 or 16-bit
8 or 16-bit
I, E
I, E
P, SN, ST, MS
P, SN, ST, MS
Features
Description
• Low-power CMOS technology
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.
• 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:
Package Types (not to scale)
- Industrial (I)
-40°C to +85°C
-40°C to +125°C
ROTATED SOIC
(ex: 93LC66BX)
PDIP/SOIC
(P, SN)
- Automotive (E)
Pin Function Table
NC
1
2
3
4
8
7
6
5
ORG*
CS
CLK
DI
VCC
1
2
3
4
8
7
6
5
VCC
VSS
NC
Name
Function
CS
DO
DI
ORG*
CS
CLK
DI
Chip Select
CLK
DO
VSS
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
TSSOP/MSOP
(ST, MS)
SOT-23
(OT)
1
2
3
4
8
7
6
5
DO
CS
CLK
DI
DO
VCC
1
2
3
6
5
4
DO
VCC
NC
ORG*
VSS
VSS
NC
VSS
CS
DI
CLK
No internal connection
Memory Configuration
Power Supply
* ORG pin is NC on A/B devices
ORG
VCC
2003 Microchip Technology Inc.
DS21795B-page 1