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July 2000
FM93C66
4096-Bit Serial CMOS EEPROM
(MICROWIRE™ Synchronous Bus)
General Description
FM93C66 is a 4096-bit CMOS non-volatile EEPROM organized
as 256 x 16-bit array. This device features MICROWIRE interface
which is a 4-wire serial bus with chipselect (CS), clock (SK), data
input (DI) and data output (DO) signals. This interface is compat-
ible to many of standard Microcontrollers and Microprocessors.
There are 7 instructions implemented on the FM93C66 for various
Read, Write, Erase, and Write Enable/Disable operations. This
device is fabricated using Fairchild Semiconductor floating-gate
CMOS process for high reliability, high endurance and low power
consumption.
“LZ” and “L” versions of FM93C66 offer very low standby current
making them suitable for low power applications. This device is
offered in both SO and TSSOP packages for small space consid-
erations.
Features
I Wide VCC 2.7V - 5.5V
I Typical active current of 200µA
10µA standby current typical
1µA standby current typical (L)
0.1µA standby current typical (LZ)
I No Erase instruction required before Write instruction
I Self timed write cycle
I Device status during programming cycles
I 40 year data retention
I Endurance: 1,000,000 data changes
I Packages available: 8-pin SO, 8-pin DIP, 8-pin TSSOP
Functional Diagram
CS
SK
DI
INSTRUCTION
REGISTER
ADDRESS
REGISTER
INSTRUCTION
DECODER
CONTROL LOGIC
AND CLOCK
GENERATORS
DECODER
EEPROM ARRAY
16
READ/WRITE AMPS
16
DATA IN/OUT REGISTER
16 BITS
DO DATA OUT BUFFER
VCC
HIGH VOLTAGE
GENERATOR
AND
PROGRAM
TIMER
VSS
© 2000 Fairchild Semiconductor International
FM93C66 Rev. C.1
1
www.fairchildsemi.com

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Connection Diagram
Dual-In-Line Package (N)
8–Pin SO (M8) and 8–Pin TSSOP (MT8)
CS 1
SK 2
DI 3
DO 4
8 VCC
7 NC
6 NC
5 GND
Top View
Package Number
N08E, M08A and MTC08
Pin Names
CS Chip Select
SK Serial Data Clock
DI Serial Data Input
DO Serial Data Output
GND
Ground
NC No Connect
VCC Power Supply
NOTE: Pins designated as "NC" are typically unbonded pins. However some of them are bonded for special testing purposes. Hence if a signal is applied to these pins, care
should be taken that the voltage applied on these pins does not exceed the VCC applied to the device. This will ensure proper operation.
Ordering Information
FM 93 C XX LZ E XXX
Letter Description
Package
Temp. Range
Voltage Operating Range
Density
Interface
N
M8
MT8
8-pin DIP
8-pin SO
8-pin TSSOP
None
V
E
0 to 70°C
-40 to +125°C
-40 to +85°C
Blank
L
LZ
4.5V to 5.5V
2.7V to 5.5V
2.7V to 5.5V and
<1µA Standby Current
66 4096 bits
C CMOS
CS Data protect and sequential
read
93 MICROWIRE
Fairchild Memory Prefix
FM93C66 Rev. C.1
2 www.fairchildsemi.com

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Absolute Maximum Ratings (Note 1)
Operating Conditions
Ambient Storage Temperature
All Input or Output Voltages
with Respect to Ground
Lead Temperature
(Soldering, 10 sec.)
ESD rating
-65°C to +150°C
+6.5V to -0.3V
+300°C
2000V
Ambient Operating Temperature
FM93C66
FM93C66E
FM93C66V
Power Supply (VCC)
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
4.5V to 5.5V
DC and AC Electrical Characteristics VCC = 4.5V to 5.5V unless otherwise specified
Symbol
ICCA
ICCS
IIL
IOL
VIL
VIH
VOL1
VOH1
VOL2
VOH2
fSK
tSKH
Parameter
Operating Current
Standby Current
Input Leakage
Output Leakage
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
Output Low Voltage
Output High Voltage
SK Clock Frequency
SK High Time
Conditions
CS = VIH, SK=1.0 MHz
CS = VIL
VIN = 0V to VCC
(Note 2)
IOL = 2.1 mA
IOH = -400 µA
IOL = 10 µA
IOH = -10 µA
(Note 3)
0°C to +70°C
-40°C to +125°C
Min
-0.1
2
2.4
VCC - 0.2
250
300
Max
1
50
±-1
0.8
VCC +1
0.4
0.2
1
Units
mA
µA
µA
V
V
V
MHz
ns
tSKL SK Low Time
tCS Minimum CS Low Time
tCSS CS Setup Time
tDH DO Hold Time
tDIS DI Setup Time
tCSH CS Hold Time
tDIH DI Hold Time
tPD Output Delay
tSV CS to Status Valid
tDF CS to DO in Hi-Z
tWP Write Cycle Time
(Note 4)
CS = VIL
250 ns
250 ns
50 ns
70 ns
100 ns
0 ns
20 ns
500 ns
500 ns
100 ns
10 ms
FM93C66 Rev. C.1
3 www.fairchildsemi.com