Features
•
Low-voltage and Standard-voltage Operation
– 5.0 (V
CC
= 4.5V to 5.5V)
– 2.7 (V
CC
= 2.7V to 5.5V)
– 2.5 (V
CC
= 2.5V to 5.5V)
– 1.8 (V
CC
= 1.8V to 5.5V)
User-selectable Internal Organization
– 1K: 128 x 8 or 64 x 16
– 2K: 256 x 8 or 128 x 16
– 4K: 512 x 8 or 256 x 16
3-wire Serial Interface
2 MHz Clock Rate (5V)
Self-timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
Automotive Grade and Extended Temperature Devices Available
8-lead PDIP, 8-lead JEDEC and EIAJ SOIC, and 8-lead TSSOP Packages
•
•
•
•
•
•
•
3-wire Serial
EEPROMs
1K (128 x 8 or 64 x 16)
2K (256 x 8 or 128 x 16)
4K (512 x 8 or 256 x 16)
Description
The AT93C46/56/66 provides 1024/2048/4096 bits of serial electrically erasable pro-
grammable read only memory (EEPROM) organized as 64/128/256 words of 16 bits
each, when the ORG pin is connected to VCC and 128/256/512 words of 8 bits each
when it is tied to ground. The device is optimized for use in many industrial and com-
mercial applications where low power and low voltage operations are essential. The
AT93C46/56/66 is available in space-saving 8-lead PDIP and 8-lead JEDEC and EIAJ
(continued)
SOIC packages.
AT93C46
AT93C56
AT93C66
Pin Configurations
Pin Name
CS
SK
DI
DO
GND
VCC
ORG
DC
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Internal Organization
Don’t Connect
8-lead SOIC
8-lead PDIP
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
DC
ORG
GND
8-lead SOIC
Rotated (R)
(1K JEDEC Only)
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
DC
ORG
GND
8-lead TSSOP
DC
VCC
CS
SK
1
2
3
4
8
7
6
5
ORG
GND
DO
DI
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
DC
ORG
GND
Rev. 0172O–08/01
1
The AT93C46/56/66 is enabled through the Chip Select pin (CS), and accessed via a
3-wire serial interface consisting of Data Input (DI), Data Output (DO), and Shift Clock
(SK). Upon receiving a READ instruction at DI, the address is decoded and the data is
clocked out serially on the data output pin DO. The WRITE cycle is completely self-
timed and no separate ERASE cycle is required before WRITE. The WRITE cycle is
only enabled when the part is in the ERASE/WRITE ENABLE state. When CS is brought
“high” following the initiation of a WRITE cycle, the DO pin outputs the READY/BUSY
status of the part.
The AT93C46 is available in 4.5V to 5.5V, 2.7V to 5.5V, 2.5V to 5.5V, and 1.8V to 5.5V
versions. The AT93C56/66 is available in 4.5V to 5.5V, 2.7V to 5.5V, and 2.5V to 5.5V
versions.
Absolute Maximum Ratings*
Operating Temperature.................................. -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
Voltage on Any Pin
with Respect to Ground .....................................-1.0V to +7.0V
Maximum Operating Voltage .......................................... 6.25V
DC Output Current........................................................ 5.0 mA
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability
Block Diagram
Notes:
1.
When the ORG pin is connected to VCC, the x 16 organization is selected. When it is connected to ground, the x 8 orga-
nization is selected. If the ORG pin is left unconnected and the application does not load the input beyond the capability of
the internal 1 Meg ohm pullup, then the x 16 organization is selected. The feature is not available on the 1.8V devices.
2. For the AT93C46, if x 16 organization is the mode of choice and Pin 6 (ORG) is left unconnected, Atmel recommends
using the AT93C46A device. For more details, see the AT93C46A datasheet.
2
AT93C46/56/66
0172O–08/01
AT93C46/56/66
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25
°
C, f = 1.0 MHz, V
CC
= +5.0V (unless otherwise noted).
Symbol
C
OUT
C
IN
Note:
Test Conditions
Output Capacitance (DO)
Input Capacitance (CS, SK, DI)
1. This parameter is characterized and is not 100% tested.
Max
5
5
Units
pF
pF
Conditions
V
OUT
= 0V
V
IN
= 0V
DC Characteristics
Applicable over recommended operating range from: T
AI
= -40
°
C to +85
°
C, V
CC
= +1.8V to +5.5V,
T
AC
= 0
°
C to +70
°
C, V
CC
= +1.8V to +5.5V (unless otherwise noted).
Symbol
V
CC1
V
CC2
V
CC3
V
CC4
I
CC
I
SB1
I
SB2
I
SB3
I
SB4
I
IL
I
OL
V
IL1(1)
V
IH1(1)
V
IL2(1)
V
IH2(1)
V
OL1
V
OH1
V
OL2
V
OH2
Note:
Parameter
Supply Voltage
Supply Voltage
Supply Voltage
Supply Voltage
READ at 1.0 MHz
Supply Current
Standby Current
Standby Current
Standby Current
Standby Current
Input Leakage
Output Leakage
Input Low Voltage
Input High Voltage
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
Output Low Voltage
Output High Voltage
V
CC
= 5.0V
V
CC
= 1.8V
V
CC
= 2.5V
V
CC
= 2.7V
V
CC
= 5.0V
V
IN
= 0V to V
CC
V
IN
= 0V to V
CC
4.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
≤
2.7V
4.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
≤
2.7V
I
OL
= 2.1 mA
I
OH
= -0.4 mA
I
OL
= 0.15 mA
I
OH
= -100 µA
V
CC
- 0.2
2.4
0.2
-0.6
2.0
-0.6
V
CC
x 0.7
WRITE at 1.0 MHz
CS = 0V
CS = 0V
CS = 0V
CS = 0V
Test Condition
Min
1.8
2.5
2.7
4.5
0.5
0.5
0
6.0
6.0
17
0.1
0.1
Typ
Max
5.5
5.5
5.5
5.5
2.0
2.0
0.1
10.0
10.0
30
1.0
1.0
0.8
V
CC
+ 1
V
CC
x 0.3
V
CC
+ 1
0.4
Unit
V
V
V
V
mA
mA
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V
1. V
IL
min and V
IH
max are reference only and are not tested.
3
0172O–08/01
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