AT24C256C - Complete

AT24C256C
I2C-Compatible (2-Wire) Serial EEPROM
256-Kbit (32,768 x 8)
DATASHEET
Features

Low-voltage and Standard-voltage Operation
̶







VCC = 1.7V to 5.5V
Internally Organized as 32,768 x 8
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
400kHz (1.7V) and 1MHz (2.5V, 2.7V, 5.0V) Compatibility
Write Protect Pin for Hardware Protection
64-byte Page Write Mode
̶


Partial Page Writes Allowed
Self-timed Write Cycle (5ms Max)
High Reliability
̶
Endurance: 1,000,000 Write Cycles
Data Retention: 40 Years
̶


Lead-free/Halogen-free Devices Available
Green Package Options (Pb/Halide-free/RoHS Compliant)
̶

8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 8-ball VFBGA
Packages
Die Sale Options: Wafer Form, Waffle Pack, and Bumped Wafers
Description
The Atmel® AT24C256C provides 262,144-bits of Serial Electrically Erasable and
Programmable Read-Only Memory (EEPROM) organized as 32,768 words of
8 bits each. The device’s cascading feature allows up to eight devices to share a
common 2-wire bus. The device is optimized for use in many industrial and
commercial applications where low-power and low-voltage operation are
essential. The devices are available in space-saving 8-lead JEDEC SOIC, 8-lead
TSSOP, 8-pad UDFN, and 8-ball VFBGA packages. In addition, this device
operates from 1.7V to 5.5V.
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
1.
Pin Configurations and Pinouts
Table 1-1.
Pin
Function
A0
Address Input
A1
Address Input
A2
Address Input
GND
Ground
SDA
Serial Data
SCL
Serial Clock Input
WP
VCC
2.
Pin Configuration
Write Protect
8-lead SOIC
A0
1
8
VCC
A1
2
7
WP
A2
3
6
SCL
GND
4
SDA
5
A0
A1
A2
GND
1
8
2
7
3
6
4
5
Top View
Top View
8-pad UDFN
8-ball VFBGA
A0 1
8
VCC
VCC
8
1
A0
A1 2
7
WP
WP
7
2
A1
A2 3
6
SCL
SCL
6
3
A2
GND 4
5
SDA
SDA
5
4
GND
Device Power Supply
Top View
VCC
WP
SCL
SDA
Bottom View
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 . . . . . . . . . . . . . . . -1.0 V +7.0V
Maximum Operating Voltage . . . . . . . . . . . . . . . 6.25V
DC Output Current . . . . . . . . . . . . . . . . . . . . . . .5.0mA
2
8-lead TSSOP
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
*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 are not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
3.
Block Diagram
VCC
GND
WP
Start
Stop
Logic
Serial
Control
Logic
LOAD
Device
Address
Comparator
A2
A1
A0
R/W
EN
H.V. Pump/Timing
COMP
LOAD
Data Word
Addr/Counter
Y DEC
Data Recovery
INC
X DEC
SCL
SDA
EEPROM
Serial MUX
DOUT/ACK
LOGIC
DIN
DOUT
4.
Pin Descriptions
Serial Clock (SCL): The SCL input is used to positive-edge clock data into each EEPROM device and negativeedge clock data out of each device.
Serial Data (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open drain driven and may be
wire-ORed with any number of other open-drain or open-collector devices.
Device Addresses (A2, A1, A0): The A2, A1, and A0 pins are device address inputs that are hard wired (directly to
GND or to VCC) for compatibility with other Atmel AT24C devices. When the pins are hard wired, as many as eight
256K devices may be addressed on a single bus system. (Device addressing is discussed in detail in Section 7.
“Device Addressing” on page 9). A device is selected when a corresponding hardware and software match is true.
If these pins are left floating, the A2, A1, and A0 pins will be internally pulled down to GND. However, due to
capacitive coupling that may appear during customer applications, Atmel recommends always connecting the
address pins to a known state. When using a pull-up resistor, Atmel recommends using 10k or less.
Write Protect (WP): The Write Protect input, when connected to GND, allows normal write operations. When WP
is connected directly to VCC, all write operations to the memory are inhibited. If the pin is left floating, the WP pin
will be internally pulled down to GND. However, due to capacitive coupling that may appear during customer
applications, Atmel recommends always connecting the WP pins to a known state. When using a pull-up resistor,
Atmel recommends using 10k or less.
Table 4-1.
Write Protect
WP Pin Status
Part of the Array Protected
At VCC
Full Array
At GND
Normal Read/Write Operations
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
3
5.
Memory Organization
AT24C256C, 256K Serial EEPROM: The 256K is internally organized as 512 pages of 64-bytes each. Random
word addressing requires a 15-bit data word address.
5.1
Pin Capacitance
Table 5-1.
Pin Capacitance(1)
Applicable over recommended operating range from: TA = 25°C, f = 1.0MHz, VCC = 1.7V to 5.5V.
Symbol
Test Condition
CI/O
CIN
Note:
5.2
1.
Max
Units
Conditions
Input/Output Capacitance (SDA)
8
pF
VI/O = 0V
Input Capacitance (A0, A1, A2, and SCL)
6
pF
VIN = 0V
This parameter is characterized and is not 100% tested.
DC Characteristics
Table 5-2.
DC Characteristics
Applicable over recommended operating range from: TAI = - 40°C to +85°C, VCC = 1.7V to 5.5V (unless otherwise noted).
Symbol
Parameter
VCC1
Supply Voltage
ICC1
Supply Current
VCC = 5.0V
Read at 400kHz
ICC2
Supply Current
VCC = 5.0V
Write at 400kHz
ISB1
Standby Current
ILI
Input Leakage
Current VCC = 5.0V
VIN = VCC or VSS
ILO
Output Leakage
Current VCC = 5.0V
VOUT = VCC or VSS
VIL
Input Low Level(1)
VIH
Input High Level((1)
VOL1
Output Low Level
VCC = 1.7V
VOL2
Output Low Level
VCC = 3.0V
Note:
4
1.
Test Condition
Max
Units
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
Typ
5.5
V
1.0
2.0
mA
2.0
3.0
mA
1.0
A
6.0
A
0.10
3.0
A
0.05
3.0
A
-0.6
VCC x 0.3
V
VCC x 0.7
VCC + 0.5
V
IOL = 0.15mA
0.2
V
IOL = 2.1mA
0.4
V
1.7
VCC = 1.7V
VCC = 5.0V
VIN = VCC or VSS
VIL min and VIH max are reference only and are not tested.
AT24C256C [DATASHEET]
Min
5.3
AC Characteristics
Table 5-3.
AC Characteristics (Industrial Temperature)
Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = 1.7V to 5.5V, CL = 100 pF (unless
otherwise noted). Test conditions are listed in Note 2.
1.7V
Min
2.5V, 5.0V
Symbol
Parameter
Max
Min
fSCL
Clock Frequency, SCL
tLOW
Clock Pulse Width Low
1300
400
ns
tHIGH
Clock Pulse Width High
600
400
ns
tI
Noise Suppression Time(1)
tAA
Clock Low to Data Out Valid
tBUF
Time the bus must be free before a new transmission
can start(1)
1300
500
ns
tHD.STA
Start Hold Time
600
250
ns
tSU.STA
Start Set-up Time
600
250
ns
tHD.DAT
Data In Hold Time
0
0
ns
tSU.DAT
Data In Set-up Time
100
100
ns
tR
Inputs Rise Time(1)
400
100
50
(1)
900
50
Max
Units
1000
kHz
50
ns
550
ns
300
300
ns
300
100
ns
tF
Inputs Fall Time
tSU.STO
Stop Set-up Time
600
250
ns
tDH
Data Out Hold Time
50
50
ns
tWR
(1)
Endurance
Notes:
1.
2.
Write Cycle Time
5
25°C, Page Mode, 3.3V
1,000,000
5
ms
Write Cycles
This parameter is ensured by characterization and is not 100% tested.
AC measurement conditions:

RL (connects to VCC): 1.3kΩ (2.5V, 5.5V), 10kΩ (1.7V)

Input pulse voltages: 0.3VCC to 0.7VCC

Input rise and fall times: ≤ 50ns

Input and output timing reference voltages: 0.5 x VCC
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
5
6.
Device Operation
Clock and Data Transitions: The SDA pin is normally pulled high with an external device. Data on the SDA pin
may change only during SCL low time periods. Data changes during SCL high periods will indicate a start or
stop condition as defined below.
Figure 6-1.
Data Validity
SDA
SCL
Data Stable
Data Stable
Data
Change
Start Condition: A high-to-low transition of SDA with SCL high is a start condition that must precede any other
command.
Stop Condition: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the
stop command will place the EEPROM in a standby power mode.
Figure 6-2.
Start and Stop Definition
SDA
SCL
Start
6
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
Stop
Acknowledge: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words.
The EEPROM sends a zero during the ninth clock cycle to acknowledge that it has received each word.
Figure 6-3.
Output Acknowledge
1
SCL
8
9
Data In
Data Out
Acknowledge
Start
Standby Mode: AT24C256C features a low-power standby mode that is enabled upon power-up and after the
receipt of the Stop condition and the completion of any internal operations.
Software Reset: After an interruption in protocol, power-loss or system reset, any 2-wire part can be protocol
reset by following these steps:
1.
Create a Start condition (if possible).
2.
3.
Clock nine cycles.
Create another Start condition followed by Stop condition as shown below.
The device should be ready for the next communication after above steps have been completed. In the event
that the device is still non-responsive or remains active on the SDA bus, a power cycle must be used to reset
the device.
Figure 6-4.
Software Reset
Dummy Clock Cycles
SCL
1
Start
Condition
2
3
8
9
Start
Condition
Stop
Condition
SDA
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
7
Figure 6-5.
Bus Timing
tHIGH
tF
tR
tLOW
tLOW
SCL
tSU.STA
tHD.STA
tHD.DAT
tSU.DAT
tSU.STO
SDA In
tAA
tDH
tBUF
SDA Out
Figure 6-6.
Write Cycle Timing
SCL
SDA
8th Bit
ACK
WORDN
tWR
Stop
Condition
Note:
8
1.
(1)
Start
Condition
The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of
the internal clear/write cycle.
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
7.
Device Addressing
The 256K EEPROM requires an 8-bit device address word following a start condition to enable the chip for a
read or write operation. The device address word consists of a mandatory one, zero sequence for the first four
most significant bits as shown. This is common to all 2-wire EEPROM devices.
Figure 7-1.
1
MSB
Device Addressing
0
1
0
A2
A1
A0
R/W
LSB
The next three bits are the A2, A1, and A0 device address bits to allow as many as eight devices on the same
bus. These bits must compare to their corresponding hard wired input pins. The A2, A1, and A0 pins use an
internal proprietary circuit that biases them to a logic low condition if the pins are allowed to float.
The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit is
high, and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a zero. If a compare is not made, the device
will return to a standby state.
Data Security: The AT24C256C has a hardware data protection scheme that allows the user to write protect
the whole memory when the WP pin is at VCC.
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
9
8.
Write Operations
Byte Write: A Write operation requires two 8-bit data word addresses following the device address word and
acknowledgment. Upon receipt of this address, the EEPROM will again respond with a zero, and then clock in
the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a zero. The
addressing device, such as a microcontroller, must then terminate the write sequence with a Stop condition. At
this time, the EEPROM enters an internally-timed write cycle, tWR, to the nonvolatile memory. All inputs are
disabled during this write cycle and the EEPROM will not respond until the write is complete.
Figure 8-1.
Byte Write
S
T
A
R
T
Device
Address
W
R
I
T
E
First
Word Address
Second
Word Address
S
T
O
P
Data
SDA Line
M
S
B
Note:
R A
/ C
W K
A
C
K
A
C
K
A
C
K
* = Don’t care bit
Page Write: The 256K EEPROM is capable of 64-byte page writes.
A Page Write is initiated the same way as a Byte Write, but the microcontroller does not send a Stop condition
after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word,
the microcontroller can transmit up to 63 more data words. The EEPROM will respond with a zero after each
data word received. The microcontroller must terminate the page write sequence with a Stop condition .
Figure 8-2.
Page Write
S
T
A
R
T
Device
Address
W
R
I
T
E
First
Word Address
Second
Word Address
Data (n)
S
T
O
P
Data (n + x)
SDA Line
M
S
B
Note:
R A
/ C
WK
A
C
K
A
C
K
A
C
K
A
C
K
* = Don’t care bit
The data word address lower six bits are internally incremented following the receipt of each data word. The
higher data word address bits are not incremented, retaining the memory page row location. When the word
address, internally generated, reaches the page boundary, the following byte is placed at the beginning of the
same page. If more than 64 data words are transmitted to the EEPROM, the data word address will roll-over
and the previous data will be overwritten. The address roll-over during write is from the last byte of the current
page to the first byte of the same page.
Acknowledge Polling: Once the internally-timed write cycle has started and the EEPROM inputs are disabled,
acknowledge polling can be initiated. This involves sending a Start condition followed by the device address
word. The Read/Write bit is representative of the operation desired. Only if the internal write cycle has
completed will the EEPROM respond with a zero, allowing the read or write sequence to continue.
10
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
9.
Read Operations
Read operations are initiated the same way as write operations with the exception that the Read/Write select bit
in the device address word is set to one. There are three read operations:



Current Address Read
Random Address Read
Sequential Read
Current Address Read: The internal data word address counter maintains the last address accessed during
the last read or write operation, incremented by one. This address stays valid between operations as long as the
chip power is maintained. The address roll-over during read is from the last byte of the last memory page, to the
first byte of the first page.
Once the device address with the Read/Write select bit set to one is clocked in and acknowledged by the
EEPROM, the current address data word is serially clocked out. The microcontroller does not respond with an
input zero but does generate a following stop condition.
Figure 9-1.
Current Address Read
S
T
A
R
T
R
E
A
D
Device
Address
S
T
O
P
Data
SDA Line
M
S
B
N
O
R A
/ C
WK
A
C
K
Random Read: A Random Read requires a dummy byte write sequence to load in the data word address. Once
the device address word and data word address are clocked in and acknowledged by the EEPROM, the
microcontroller must generate another start condition. The microcontroller now initiates a Current Address Read
by sending a device address with the read/write select bit high. The EEPROM acknowledges the device
address and serially clocks out the data word. The microcontroller does not respond with a zero but does
generate a following Stop condition.
Figure 9-2.
Random Read
S
T
A
R
T
Device
Address
W
R
I
T
E
First Word
Address
S
T
A
R
T
Second Word
Address
Device
Address
R
E
A
D
S
T
O
P
Data (n)
SDA LINE
M
S
B
R A
/ C
W K
A
C
K
L A
S C
B K
R A
/ C
WK
A
C
K
Dummy Write
Note:
N
O
* = Don’t care bit
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
11
Sequential Read: Sequential Reads are initiated by either a Current Address Read or a Random Address
Read. After the microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM
receives an acknowledge, it will continue to increment the data word address and serially clock out sequential
data words. When the memory address limit is reached, the data word address will roll-over, and the Sequential
Read will continue. The Sequential Read operation is terminated when the microcontroller does not respond
with a zero but does generate a following Stop condition.
Figure 9-3.
Sequential Read
S
T
A
R
T
Device
Address
W
R
I
T
E
First Word
Address
Second Word
Address
...
SDA LINE
M
S
B
R A
/ C
W K
L A
S C
B K
A
C
K
Dummy Write
S
T
A
R
T
Device
Address
R
E
A
D
Data (n)
Data (n + 1)
Data (n + 2)
S
T
O
P
Data (n + x)
...
R A
/ C
WK
A
C
K
A
C
K
A
C
K
N
O
A
C
K
Note:
12
* = Don’t care bit
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
10.
Ordering Code Detail
AT 2 4 C 2 5 6 C - S S H L - B
Atmel Designator
Product Family
24C = Standard I2C-compatible
Serial EEPROM
Device Density
256 = 256K
Shipping Carrier Option
B
T
E
= Bulk (Tubes)
= Tape and Reel, Standard Quantity Option
= Tape and Reel, Expanded Quantity Option
Operating Voltage
L
= 1.7V to 5.5V
Package Device Grade or
Wafer/Die Thickness
H
Device Revision
= Green, NiPdAu Lead Finish,
Industrial Temperature Range
(-40°C to +85°C)
U = Green, Matte Sn Lead Finish,
Industrial Temperature Range
(-40°C to +85°C)
11 = 11mil wafer thickness
Package Option
SS
X
MA
C
WWU
WDT
=
=
=
=
=
=
JEDEC SOIC
TSSOP
UDFN
VFBGA
Wafer Unsawn
Die in Tape and Reel
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
13
11.
Part Markings
AT24C256C: Package Marking Information
8-lead TSSOP
8-lead SOIC
ATMLHYWW
2ECL
@
AAAAAAAA
8-lead UDFN
8-ball VFBGA
2.0 x 3.0 mm Body
2.35 x 3.73 mm Body
2EC
HL@
YXX
Note 1:
ATHYWW
2ECL @
AAAAAAA
2ECU
@YMXX
designates pin 1
Note 2: Package drawings are not to scale
Catalog Number Truncation
AT24C256C
Truncation Code ###: 2EC
Date Codes
Y = Year
2: 2012
3: 2013
4: 2014
5: 2015
Voltages
6: 2016
7: 2017
8: 2018
9: 2019
M = Month
A: January
B: February
...
L: December
WW = Work Week of Assembly
02: Week 2
04: Week 4
...
52: Week 52
Country of Assembly
Lot Number
@ = Country of Assembly
AAA...A = Atmel Wafer Lot Number
Trace Code
L: 1.7V min
Grade/Lead Finish Material
U: Industrial/Matte Tin
H: Industrial/NiPdAu
Atmel Truncation
XX = Trace Code (Atmel Lot Numbers Correspond to Code)
Example: AA, AB.... YZ, ZZ
AT: Atmel
ATM: Atmel
ATML: Atmel
6/5/12
TITLE
Package Mark Contact:
[email protected]
14
24C256CSM, AT24C256C Package Marking Information
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
DRAWING NO.
REV.
24C256CSM
C
12.
Ordering Information
Delivery Information
Atmel Ordering Code
Lead Finish
Package
Form
Quantity
Bulk (Tubes)
100 per Tube
Tape and Reel
4,000 per Reel
Bulk (Tubes)
100 per Tube
Tape and Reel
5,000 per Reel
Tape and Reel
5,000 per Reel
Tape and Reel
15,000 per Reel
Tape and Reel
5,000 per Reel
AT24C256C-SSHL-B
Operating
Range
8S1
AT24C256C-SSHL-T
AT24C256C-XHL-B
AT24C256C-XHL-T
8X
NiPdAu
(Lead-free/Halogen-free)
AT24C256C-MAHL-T
Industrial
Temperature
(-40°C to 85°C)
8MA2
AT24C256C-MAHL-E
AT24C256C-CUL-T
AT24C256C-WWU11L(1)
Note:
1.
8U2-1
N/A
Wafer Sale
Note 1
Contact Atmel Sales for Wafer sales.
Package Type
8S1
8-lead, 0.150” wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8X
8-lead, 4.40mm body, Plastic Thin Shrink Small Outline Package (TSSOP)
8MA2
8-pad, 2.00mm x 3.00mm body, 0.50mm pitch, Dual No Lead (UDFN)
8U2-1
8-ball, Die Ball Grid Array Package (VFBGA)
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
15
13.
Packaging Information
13.1
8S1 — 8-lead JEDEC SOIC
C
1
E
E1
L
N
Ø
TOP VIEW
END VIEW
e
b
COMMON DIMENSIONS
(Unit of Measure = mm)
A
A1
D
SIDE VIEW
Notes: This drawing is for general information only.
Refer to JEDEC Drawing MS-012, Variation AA
for proper dimensions, tolerances, datums, etc.
SYMBOL MIN
A
1.35
NOM
MAX
–
1.75
A1
0.10
–
0.25
b
0.31
–
0.51
C
0.17
–
0.25
D
4.80
–
5.05
E1
3.81
–
3.99
E
5.79
–
6.20
e
NOTE
1.27 BSC
L
0.40
–
1.27
Ø
0°
–
8°
6/22/11
Package Drawing Contact:
[email protected]
16
TITLE
8S1, 8-lead (0.150” Wide Body), Plastic Gull Wing
Small Outline (JEDEC SOIC)
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
GPC
SWB
DRAWING NO.
REV.
8S1
G
13.2
8X — 8-lead TSSOP
C
1
Pin 1 indicator
this corner
E1
E
L1
N
L
Top View
End View
A
b
A1
e
D
SYMBOL
Side View
Notes:
COMMON DIMENSIONS
(Unit of Measure = mm)
A2
1. This drawing is for general information only.
Refer to JEDEC Drawing MO-153, Variation AA, for proper
dimensions, tolerances, datums, etc.
2. Dimension D does not include mold Flash, protrusions or gate
burrs. Mold Flash, protrusions and gate burrs shall not exceed
0.15mm (0.006in) per side.
3. Dimension E1 does not include inter-lead Flash or protrusions.
Inter-lead Flash and protrusions shall not exceed 0.25mm
(0.010in) per side.
4. Dimension b does not include Dambar protrusion.
Allowable Dambar protrusion shall be 0.08mm total in excess
of the b dimension at maximum material condition. Dambar
cannot be located on the lower radius of the foot. Minimum
space between protrusion and adjacent lead is 0.07mm.
5. Dimension D and E1 to be determined at Datum Plane H.
MIN
NOM
MAX
A
-
-
1.20
A1
0.05
-
0.15
A2
0.80
1.00
1.05
D
2.90
3.00
3.10
2, 5
E
NOTE
6.40 BSC
E1
4.30
4.40
4.50
3, 5
b
0.19
0.25
0.30
4
e
L
0.65 BSC
0.45
L1
C
0.60
0.75
1.00 REF
0.09
-
0.20
2/27/14
TITLE
Package Drawing Contact:
[email protected]
8X, 8-lead 4.4mm Body, Plastic Thin
Shrink Small Outline Package (TSSOP)
GPC
TNR
DRAWING NO.
8X
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
REV.
E
17
13.3
8MA2 — 8-pad UDFN
E
1
8
Pin 1 ID
2
7
3
6
4
5
D
C
TOP VIEW
A2
SIDE VIEW
A
A1
E2
b (8x)
8
7
1
D2
6
3
5
4
e (6x)
K
L (8x)
BOTTOM VIEW
Notes:
COMMON DIMENSIONS
(Unit of Measure = mm)
2
Pin#1 ID
1. This drawing is for general information only. Refer to
Drawing MO-229, for proper dimensions, tolerances,
datums, etc.
2. The Pin #1 ID is a laser-marked feature on Top View.
3. Dimensions b applies to metallized terminal and is
measured between 0.15 mm and 0.30 mm from the
terminal tip. If the terminal has the optional radius on
the other end of the terminal, the dimension should
not be measured in that radius area.
4. The Pin #1 ID on the Bottom View is an orientation
feature on the thermal pad.
SYMBOL
MIN
NOM
MAX
A
0.50
0.55
0.60
A1
0.0
0.02
0.05
A2
-
-
0.55
D
1.90
2.00
2.10
D2
1.40
1.50
1.60
E
2.90
3.00
3.10
E2
1.20
1.30
1.40
b
0.18
0.25
0.30
C
L
3
1.52 REF
0.30
e
K
NOTE
0.35
0.40
0.50 BSC
0.20
-
-
11/26/14
Package Drawing Contact:
[email protected]
18
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
TITLE
8MA2, 8-pad 2 x 3 x 0.6mm Body, Thermally
Enhanced Plastic Ultra Thin Dual Flat No-Lead
Package (UDFN)
GPC
DRAWING NO.
REV.
YNZ
8MA2
G
13.4
8U2-1 — 8-ball VFBGA
f 0.10 C
d 0.10
A1 BALL
PAD
CORNER
D
A
(4X)
d 0.08 C
C
A1 BALL PAD CORNER
2
1
Øb
A
j n0.15 m C A B
j n0.08 m C
B
e
E
C
D
(e1)
B
A1
d
A2
(d1)
A
TOP VIEW
BOTTOM VIEW
SIDE VIEW
8 SOLDER BALLS
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL
Notes:
1. This drawing is for general
2. Dimension 'b' is measured at the maximum solder ball diameter.
3. Solder ball composition shall be 95.5Sn-4.0Ag-.5Cu.
A
A1
A2
b
D
E
e
e1
d
d1
MIN
0.81
0.15
0.40
0.25
NOM
0.91
0.20
0.45
0.30
2.35 BSC
3.73 BSC
0.75 BSC
0.74 REF
0.75 BSC
0.80 REF
MAX
NOTE
1.00
0.25
0.50
0.35
6/11/13
TITLE
Package Drawing Contact:
[email protected]
8U2-1, 8-ball, 2.35 x 3.73 mm Body, 0.75 mm pitch,
Very Thin, Fine-Pitch Ball Grid Array Package
(VFBGA)
GPC
DRAWING NO.
GWW
8U2-1
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
REV.
G
19
14.
Revision History
Doc. Rev.
Date
Comments
Add the UDFN Expanded Quantity Option.
8568F
01/2015
Update 8X, 8MA2, and 8U2-1 package outline drawings, the ordering information section,
and the disclaimer page.
Update template and Atmel logo.
8568E
08/2012
Correct 8-lead UDFN to 8-pad UDFN.
Update AC characteristics from μs to ns units and their respective values.
Update part marking description.
20
Atmel global device marking alignment.
8568D
09/2011
8568C
05/2010
Update 8S1 and 8A2 package drawings.
8568B
03/2010
Part Markings and ordering detail/codes updated.
8568A
09/2009
Initial document release.
Update 8S1, 8A2 to 8X, 8MA2, and 8U2-1 package drawings.
AT24C256C [DATASHEET]
Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015
XXXXXX
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