AT93C56B and AT93C66B
3-wire Serial EEPROM
2K (256 x 8 or 128 x 16) and 4K (512 x 8 or 256 x 16)
DATASHEET
Features
Low-voltage operation
V
CC
= 1.7V to 5.5V
User-selectable internal organization
2K: 256 x 8 or 128 x 16
4K: 512 x 8 or 256 x 16
3-wire serial interface
Sequential Read operation
2MHz clock rate (5V)
Self-timed write cycle (5ms max)
High reliability
Endurance: 1,000,000 write cycles
Data retention: 100 years
8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, 8-pad XDFN, and
8-ball VFBGA packages
Description
The Atmel
®
AT93C56B/66B provides 2,048/4,096 bits of Serial Electrically Erasable
Programmable Read-Only Memory (EEPROM) organized as 128/256 words of 16 bits
each (when the ORG pin is connected to V
CC
) and 256/512 words of 8 bits each (when
the ORG pin is tied to ground). The device is optimized for use in many industrial and
commercial applications where low-power and low-voltage operations are essential.
The AT93C56B/66B is available in space-saving 8-lead JEDEC SOIC, 8-lead TSSOP,
8-pad UDFN, 8-pad XDFN, and 8-ball VFBGA packages.
The AT93C56B/66B 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 DO pin. 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 AT93C56B/66B operates from 1.7V to 5.5V.
Atmel-8735B-SEEPROM-AT93C56B-66B-Datasheet_042013
1.
Pin Configurations and Pinouts
Table 1-1.
Pin Name
CS
SK
DI
DO
GND
V
CC
ORG
NC
Pin Configurations
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Internal Organization
No Connect
8-pad UDFN/XDFN
V
CC
8
NC
7
ORG
6
GND
5
Bottom View
1
2
3
4
8-lead SOIC
CS
SK
DI
DO
1
2
3
4
8
7
6
5
8-lead TSSOP
V
CC
NC
ORG
GND
CS
SK
DI
DO
1
2
3
4
8
7
6
5
V
CC
NC
ORG
GND
Top View
Top View
8-ball VFBGA
V
CC
NC
ORG
GND
8
7
6
5
1
2
3
4
CS
SK
DI
DO
CS
SK
DI
DO
Bottom View
Note:
Drawings are not to scale.
2.
Absolute Maximum Ratings*
Operating Temperature
55C
to +125C
Storage Temperature
65C
to +150C
Voltage on any pin
with respect to ground1.0V to +7.0V
Maximum Operating Voltage . . . . . . . . . . . . . . . 6.25V
DC Output Current. . . . . . . . . . . . . . . . . . . . . . . 5.0mA
*Notice: Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent
damage 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.
Atmel AT93C56B/66B [Datasheet]
Atmel-8735B-SEEPROM-AT93C56B-66B-Datasheet_042013
2
3.
Block Diagram
V
CC
GND
Memory Array
ORG
256/512 x 8
or
128/256 x 16
Address
Decoder
Data
Register
DI
Mode Decode
Logic
Output
Buffer
CS
SK
Clock
Generator
DO
Note:
When the ORG pin is connected to V
CC
, the x 16 organization is selected. When it is connected to ground,
the x 8 organization is selected. If the ORG pin is left unconnected, and the application does not load the input
beyond the capability of the internal 1M
pull-up resistor, then the x 16 organization is selected.
Atmel AT93C56B/66B [DATASHEET]
Atmel-8735B-SEEPROM-AT93C56B-66B-Datasheet_042013
3
4.
4.1
Memory Organization
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25C, f = 1.0MHz, V
CC
= 5.0V (unless otherwise noted).
Symbol
C
OUT
C
IN
Test Conditions
Output Capacitance (DO)
Input Capacitance (CS, SK, DI)
Max
5
5
Units
pF
pF
Conditions
V
OUT
= 0V
V
IN
= 0V
Note:
1.
This parameter is characterized, and is not 100% tested.
4.2
DC Characteristics
Applicable over recommended operating range from T
AI
= -40°C to +85°C, V
CC
= 1.7V to 5.5V (unless otherwise noted).
Symbol
V
CC1
V
CC2
V
CC3
I
CC
I
SB1
I
SB2
I
SB3
I
IL
I
OL
V
IL1(1)
V
IH1(1)
V
IL2(1)
V
IH2(1)
V
OL1
V
OH1
V
OL2
V
OH2
Parameter
Supply Voltage
Supply Voltage
Supply Voltage
Supply 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
= 1.7V
V
CC
= 2.5V
V
CC
= 5.0V
V
IN
= 0V to V
CC
V
IN
= 0V to V
CC
2.5V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
2.5V
1.7V
V
CC
2.5V
2.5V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
2.5V
1.7V
V
CC
2.5V
I
OL
= 2.1mA
I
OH
=
0.4mA
I
OL
= 0.15mA
I
OH
=
100μA
V
CC
0.2
2.4
0.2
0.6
2.0
0.6
V
CC
x 0.7
Read at 1.0MHz
Write at 1.0MHz
CS = 0V
CS = 0V
CS = 0V
Test Condition
Min
1.7
2.5
4.5
0.5
0.5
0.4
6.0
10.0
0.1
0.1
Typ
Max
5.5
5.5
5.5
2.0
2.0
1.0
10.0
15.0
3.0
3.0
0.8
V
CC
+ 1
V
CC
x 0.3
V
CC
+ 1
0.4
Unit
V
V
V
mA
mA
μA
μA
μA
μA
μA
V
V
V
V
V
V
V
V
Note:
1.
V
IL
min and V
IH
max are reference only, and are not tested.
Atmel AT93C56B/66B [Datasheet]
Atmel-8735B-SEEPROM-AT93C56B-66B-Datasheet_042013
4
4.3
AC Characteristics
Applicable over recommended operating range from T
AI
=
40°C to + 85°C, V
CC
= as specified,
CL = 1 TTL gate and 100pF (unless otherwise noted).
Symbol
Parameter
Test Condition
4.5V
V
CC
5.5V
f
SK
SK Clock Frequency
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
t
SKH
SK High Time
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
Relative to SK
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
Min
0
0
0
250
1000
250
1000
250
1000
50
200
100
400
0
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
2.5V
V
CC
5.5V
1.7V
V
CC
5.5V
1.7V
V
CC
5.5V
100
400
250
1000
250
1000
250
1000
150
400
5
1,000,000
Max
2
1
250
Units
MHz
MHz
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
Write Cycles
t
SKL
SK Low Time
t
CS
Minimum CS Low Time
t
CSS
CS Setup Time
t
DIS
t
CSH
t
DIH
DI Setup Time
CS Hold Time
DI Hold Time
Relative to SK
Relative to SK
Relative to SK
t
PD1
Output Delay to 1
AC Test
t
PD0
Output Delay to 0
AC Test
t
SV
CS to Status Valid
AC Test
AC Test
CS = V
IL
t
DF
t
WP
Endurance
(1)
CS to DO in High-impedance
Write Cycle Time
5.0V, 25°C
Note:
1.
This parameter is characterized, and is not 100% tested.
Atmel AT93C56B/66B [DATASHEET]
Atmel-8735B-SEEPROM-AT93C56B-66B-Datasheet_042013
5
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