24AA32AF/24LC32AF
32K I2C™ Serial EEPROM with Quarter-Array Write-Protect
Device Selection Table
Description:
Part
Number
VCC
Range
Max. Clock
Frequency
Temp.
Ranges
24AA32AF
1.7-5.5
400 kHz(1)
I
24LC32AF
2.5-5.5
400 kHz
I, E
Note 1:
The Microchip Technology Inc. 24AA32AF/24LC32AF
(24XX32AF*) is a 32 Kbit Electrically Erasable PROM.
The device is organized as a single block of 4K x 8-bit
memory with a 2-wire serial interface. Low-voltage
design permits operation down to 1.7V, with standby
and read currents of only 1 μA and 400 μA,
respectively. It has been developed for advanced, lowpower applications such as personal communications
or data acquisition. The 24XX32AF also has a page
write capability for up to 32 bytes of data. Functional
address lines allow up to eight devices on the same
bus, for up to 256 Kbits address space. The 24XX32AF
is available in the standard 8-pin PDIP, surface mount
SOIC, TSSOP, TDFN and MSOP packages. The
24XX32AF is also available in the 5-lead SOT-23
package.
100 kHz for VCC 4,000V
• More than 1 Million Erase/Write Cycles
• Data Retention > 200 Years
• Factory Programming Available
• Packages Include 8-lead PDIP, SOIC, TSSOP,
MSOP, TDFN and 5-lead SOT-23
• Pb-Free and RoHS Compliant
• Temperature Ranges:
- Industrial (I):
-40°C to +85°C
- Automotive (E): -40°C to +125°C
Block Diagram
A0 A1 A2 WP
I/O
Control
Logic
Memory
Control
Logic
HV Generator
EEPROM
Array
XDEC
Page Latches
I/O
SCL
YDEC
SDA
Vcc
VSS
Sense Amp.
R/W Control
Package Types
PDIP, MSOP, SOIC, TSSOP
A0
1
8
VCC
A1
2
7
WP
A2
3
6
SCL
VSS
4
5
SOT-23
SCL
1
VSS
2
SDA
3
TDFN
5
WP
A0 1
8 VCC
7 WP
A1 2
4
VCC
6 SCL
A2 3
VSS 4
5 SDA
SDA
*24XX32AF is used in this document as a generic part number for the 24AA32AF/24LC32AF devices.
© 2009 Microchip Technology Inc.
DS22184A-page 1
24AA32AF/24LC32AF
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings (†)
VCC .............................................................................................................................................................................6.5V
All inputs and outputs w.r.t. VSS ......................................................................................................... -0.3V to VCC +1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied ................................................................................................-40°C to +125°C
ESD protection on all pins ......................................................................................................................................................≥ 4 kV
† NOTICE: Stresses above 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 those or any other conditions
above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating
conditions for extended periods may affect device reliability.
TABLE 1-1:
DC CHARACTERISTICS
DC CHARACTERISTICS
Param.
Symbol
No.
Characteristic
Industrial (I):
TA = -40°C to +85°C, VCC = +1.7V to +5.5V
Automotive (E): TA = -40°C to +125°C, VCC = +2.5V to +5.5V
Min.
Typ.
Max.
Units
Conditions
—
—
—
—
—
D1
—
A0, A1, A2, WP, SCL
and SDA pins
D2
VIH
High-level input voltage
0.7 VCC
—
—
V
—
D3
VIL
Low-level input voltage
—
—
0.3 VCC
0.2 VCC
V
V
VCC ≥ 2.5V
VCC < 2.5V
D4
VHYS
Hysteresis of Schmitt
Trigger inputs (SDA,
SCL pins)
0.05 VCC
—
—
V
VCC ≥ 2.5V (Note 1)
D5
VOL
Low-level output voltage
—
—
0.40
V
IOL = 3.0 mA, VCC = 4.5V
IOL = 2.1 mA, Vcc = 2.5V
D6
ILI
Input leakage current
—
—
±1
μA
VIN = VSS or VCC
D7
ILO
Output leakage current
—
—
±1
μA
VOUT = VSS or VCC
D8
CIN,
COUT
Pin capacitance
(all inputs/outputs)
—
—
10
pF
VCC = 5.0V (Note 1)
TA = 25°C, FCLK = 1 MHz
D9
ICC write Operating current
—
0.1
3
mA
VCC = 5.5V, SCL = 400 kHz
—
0.05
400
μA
—
—
0.01
—
1
5
μA
μA
D10
ICC read
D11
ICCS
Note 1:
2:
Standby current
Industrial
Automotive
SDA = SCL = VCC = 5.5V
A0, A1, A2, WP = VSS
This parameter is periodically sampled and not 100% tested.
Typical measurements taken at room temperature.
DS22184A-page 2
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
TABLE 1-2:
AC CHARACTERISTICS
Electrical Characteristics:
Industrial (I):
VCC = +1.7V to 5.5V TA = -40°C to +85°C
Automotive (E): VCC = +2.5V to 5.5V TA = -40°C to 125°C
AC CHARACTERISTICS
Param.
No.
Sym.
Characteristic
Min.
Max.
Units
Conditions
1
FCLK
Clock frequency
—
—
100
400
kHz
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
2
THIGH
Clock high time
4000
600
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
3
TLOW
Clock low time
4700
1300
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
4
TR
SDA and SCL rise time
(Note 1)
—
—
1000
300
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
5
TF
SDA and SCL fall time
(Note 1)
—
300
ns
6
THD:STA
Start condition hold time
4000
600
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
7
TSU:STA
Start condition setup time
4700
600
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
8
THD:DAT
Data input hold time
0
—
ns
(Note 2)
9
TSU:DAT
Data input setup time
250
100
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
10
TSU:STO
Stop condition setup time
4000
600
—
—
ns
1.7 V ≤ VCC < 2.5V
2.5 V ≤ VCC ≤ 5.5V
11
TSU:WP
WP setup time
4000
600
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
12
THD:WP
WP hold time
4700
1300
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
13
TAA
Output valid from clock
(Note 2)
—
—
3500
900
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
14
TBUF
Bus free time: Time the bus
must be free before a new
transmission can start
4700
1300
—
—
ns
1.7V ≤ VCC < 2.5V
2.5V ≤ VCC ≤ 5.5V
15
TOF
Output fall time from VIH
minimum to VIL maximum
CB ≤ 100 pF
10 +
0.1CB
250
ns
(Note 1)
16
TSP
Input filter spike suppression
(SDA and SCL pins)
—
50
ns
(Notes 1 and 3)
17
TWC
Write cycle time (byte or
page)
—
5
ms
—
18
—
Endurance
1,000,000
—
cycles 25°C (Note 4)
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF.
2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
3: The combined TSP and VHYS specifications are due to new Schmitt Trigger inputs, which provide improved
noise spike suppression. This eliminates the need for a TI specification for standard operation.
4: This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model, which can be obtained from Microchip’s web site
at www.microchip.com.
© 2009 Microchip Technology Inc.
DS22184A-page 3
24AA32AF/24LC32AF
FIGURE 1-1:
BUS TIMING DATA
5
SCL
SDA
IN
7
3
4
D4
2
8
10
9
6
16
14
13
SDA
OUT
WP
DS22184A-page 4
(protected)
(unprotected)
11
12
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Name
PDIP
SOIC
TSSOP
TDFN
MSOP
SOT-23
A0
1
1
1
1
1
—
Chip Address Input
A1
2
2
2
2
2
—
Chip Address Input
A2
3
3
3
3
3
—
Chip Address Input
VSS
4
4
4
4
4
2
Ground
SDA
5
5
5
5
5
3
Serial Address/Data I/O
2.1
SCL
6
6
6
6
6
1
Serial Clock
WP
7
7
7
7
7
5
Write-Protect Input
VCC
8
8
8
8
8
4
+1.7V to 5.5V Power Supply
A0, A1, A2 Chip Address Inputs
The A0, A1 and A2 inputs are used by the 24XX32AF
for multiple device operation. The levels on these
inputs are compared with the corresponding bits in the
slave address. The chip is selected if the comparison is
true.
Up to eight devices may be connected to the same bus
by using different Chip Select bit combinations. These
inputs must be connected to either VCC or VSS.
In most applications, the chip address inputs A0, A1
and A2 are hard-wired to logic ‘0’ or logic ‘1’. For
applications in which these pins are controlled by a
microcontroller or other programmable device, the chip
address pins must be driven to logic ‘0’ or logic ‘1’
before normal device operation can proceed. Address
pins are not available in the SOT-23 package.
2.2
Description
2.3
Serial Clock (SCL)
The SCL input is used to synchronize the data transfer
to and from the device.
2.4
Write-Protect (WP)
This pin must be connected to either VSS or VCC. If tied
to VSS, write operations are enabled. If tied to VCC,
write operations are inhibited for the upper 1/4 of the
array (C00h-FFFh), but read operations are not
affected.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer addresses
and data into and out of the device. It is an open-drain
terminal, therefore, the SDA bus requires a pull-up
resistor to VCC (typical 10 kΩ for 100 kHz, 2 kΩ for
400 kHz)
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating Start and Stop conditions.
© 2009 Microchip Technology Inc.
DS22184A-page 5
24AA32AF/24LC32AF
3.0
FUNCTIONAL DESCRIPTION
The 24XX32AF supports a bidirectional, 2-wire bus and
data transmission protocol. A device that sends data
onto the bus is defined as transmitter, while a device
receiving data is defined as a receiver. The bus has to
be controlled by a master device which generates the
Serial Clock (SCL), controls the bus access and generates the Start and Stop conditions, while the 24XX32AF
works as slave. Both master and slave can operate as
transmitter or receiver, but the master device
determines which mode is activated.
4.0
BUS CHARACTERISTICS
The following bus protocol has been defined:
• Data transfer may be initiated only when the bus
is not busy.
• During data transfer, the data line must remain
stable whenever the clock line is high. Changes in
the data line while the clock line is high will be
interpreted as a Start or Stop condition.
Accordingly, the following bus conditions have been
defined (Figure 4-1).
4.1
Start Data Transfer (B)
A high-to-low transition of the SDA line while the clock
(SCL) is high determines a Start condition. All
commands must be preceded by a Start condition.
4.3
Stop Data Transfer (C)
A low-to-high transition of the SDA line while the clock
(SCL) is high determines a Stop condition. All
operations must be ended with a Stop condition.
FIGURE 4-1:
(A)
Data Valid (D)
The state of the data line represents valid data when,
after a Start condition, the data line is stable for the
duration of the high period of the clock signal.
The data on the line must be changed during the low
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a Start condition and
terminated with a Stop condition. The number of data
bytes transferred between Start and Stop conditions is
determined by the master device and is, theoretically,
unlimited (although only the last thirty-two bytes will be
stored when doing a write operation). When an overwrite does occur, it will replace data in a first-in first-out
(FIFO) fashion.
4.5
Acknowledge
Each receiving device, when addressed, is obliged to
generate an Acknowledge after the reception of each
byte. The master device must generate an extra clock
pulse which is associated with this Acknowledge bit.
Note:
Bus Not Busy (A)
Both data and clock lines remain high.
4.2
4.4
The 24XX32AF does not generate any
Acknowledge
bits
if
an
internal
programming cycle is in progress.
The device that acknowledges, has to pull down the
SDA line during the Acknowledge clock pulse in such a
way that the SDA line is stable low during the high
period of the Acknowledge related clock pulse. Of
course, setup and hold times must be taken into
account. During reads, a master must signal an end of
data to the slave by not generating an Acknowledge bit
on the last byte that has been clocked out of the slave.
In this case, the slave (24XX32AF) will leave the data
line high to enable the master to generate the Stop
condition.
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(B)
(D)
Start
Condition
Address or
Acknowledge
Valid
(D)
(C)
(A)
SCL
SDA
DS22184A-page 6
Data
Allowed
to Change
Stop
Condition
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
5.0
DEVICE ADDRESSING
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1).
The control byte consists of a four-bit control code. For
the 24XX32AF, this is set as ‘1010’ binary for read and
write operations. The next three bits of the control byte
are the Chip Select bits (A2, A1, A0). The Chip Select
bits allow the use of up to eight 24XX32AF devices on
the same bus and are used to select which device is
accessed. The Chip Select bits in the control byte must
correspond to the logic levels on the corresponding A2,
A1 and A0 pins for the device to respond. These bits
are in effect the three Most Significant bits of the word
address.
an Acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24XX32AF will select a
read or write operation.
FIGURE 5-1:
Read/Write Bit
Following the Start condition, the 24XX32AF monitors
the SDA bus checking the device type identifier being
transmitted and, upon receiving a ‘1010’ code and
appropriate device select bits, the slave device outputs
FIGURE 5-2:
S
0
1
Control
Code
1
0
1
A2 A1 A0 R/W ACK
0
Slave Address
Start Bit
5.1
Acknowledge Bit
Contiguous Addressing Across
Multiple Devices
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 256K
bits by adding up to eight 24XX32AF devices on the
same bus. In this case, software can use A0 of the control byte as address bit A12; A1 as address bit A13; and
A2 as address bit A14. It is not possible to sequentially
read across device boundaries.
The SOT-23 package does not support multiple device
addressing on the same bus.
ADDRESS SEQUENCE BIT ASSIGNMENTS
Control Byte
1
Chip Select
Bits
Control Code
For the SOT-23 package, the address pins are not
available. During device addressing, the A1, A2, and
A0 Chip Select bits (Figure 5-2) should be set to ‘0’.
The last bit of the control byte defines the operation to
be performed. When set to a ‘1’, a read operation is
selected. When set to a zero, a write operation is
selected. The next two bytes received define the
address of the first data byte (Figure 5-2). Because
only A11 to A0 are used, the upper four address bits are
“don’t care” bits. The upper address bits are transferred
first, followed by the Less Significant bits.
CONTROL BYTE FORMAT
0
A
2
A
1
Address High Byte
A
0 R/W
Chip
Select
Bits
© 2009 Microchip Technology Inc.
x
x
x
x
A A
11 10
A
9
Address Low Byte
A
8
A
7
•
•
•
•
•
•
A
0
x = “don’t care” bit
DS22184A-page 7
24AA32AF/24LC32AF
6.0
WRITE OPERATIONS
6.1
Byte Write
Following the Start condition from the master, the
control code (4 bits), the Chip Select (3 bits), and the
R/W bit (which is a logic low) are clocked onto the bus
by the master transmitter. This indicates to the
addressed slave receiver that the address high byte
will follow once it has generated an Acknowledge bit
during the ninth clock cycle. Therefore, the next byte
transmitted by the master is the high-order byte of the
word address and will be written into the Address
Pointer of the 24XX32AF. The next byte is the Least
Significant Address Byte. After receiving another
Acknowledge signal from the 24XX32AF, the master
device will transmit the data word to be written into the
addressed memory location. The 24XX32AF acknowledges again and the master generates a Stop
condition. This initiates the internal write cycle and,
during this time, the 24XX32AF will not generate
Acknowledge signals (Figure 6-1). If an attempt is
made to write to the array with the WP pin held high,
the device will acknowledge the command, but no
write cycle will occur. No data will be written and the
device will immediately accept a new command. After
a byte Write command, the internal address counter
will point to the address location following the one that
was just written.
6.2
Page Write
The write control byte, word address and the first data
byte are transmitted to the 24XX32AF in the same way
as in a byte write. However, instead of generating a
Stop condition, the master transmits up to 31 additional
bytes which are temporarily stored in the on-chip page
buffer and will be written into memory once the master
has transmitted a Stop condition. Upon receipt of each
word, the five lower Address Pointer bits are internally
incremented by ‘1’. If the master should transmit more
than 32 bytes prior to generating the Stop condition, the
address counter will roll over and the previously
received data will be overwritten. As with the byte write
operation, once the Stop condition is received, an
internal write cycle will begin (Figure 6-2). If an attempt
is made to write to the array with the WP pin held high,
the device will acknowledge the command, but no write
cycle will occur, no data will be written, and the device
will immediately accept a new command.
Note:
6.3
Page write operations are limited to writing
bytes within a single physical page,
regardless of the number of bytes
actually being written. Physical page
boundaries start at addresses that are
integer multiples of the page buffer size (or
‘page size’) and end at addresses that are
integer multiples of [page size – 1]. If a
Page Write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.
Write Protection
The WP pin allows the user to write-protect 1/4 of the
array (C00h-FFFh) when the pin is tied to VCC. If tied to
VSS the write protection is disabled. The WP pin is
sampled at the Stop bit for every Write command
(Figure 4-1). Toggling the WP pin after the Stop bit will
have no effect on the execution of the write cycle.
DS22184A-page 8
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
FIGURE 6-1:
BYTE WRITE
S
T
A
R
T
Bus Activity
Master
Control
Byte
Address
High Byte
AA
S 1 0 1 0A
210 0
SDA Line
S
T
O
P
Data
xxx x
P
A
C
K
A
C
K
A
C
K
A
C
K
Bus Activity
Address
Low Byte
x = “don’t care” bit
FIGURE 6-2:
PAGE WRITE
Bus Activity
Master
S
T
A
R
T
SDA Line
AA
S10 1 0A
2100
Control
Byte
Bus Activity
Address
High Byte
Address
Low Byte
Data Byte 0
S
T
O
P
P
Data Byte 31
xxxx
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
x = “don’t care” bit
© 2009 Microchip Technology Inc.
DS22184A-page 9
24AA32AF/24LC32AF
7.0
ACKNOWLEDGE POLLING
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize bus
throughput). Once the Stop condition for a Write
command has been issued from the master, the device
initiates the internally-timed write cycle. ACK polling
can then be initiated immediately. This involves the
master sending a Start condition followed by the control
byte for a Write command (R/W = 0). If the device is still
busy with the write cycle, then no ACK will be returned.
If no ACK is returned, the Start bit and control byte must
be re-sent. If the cycle is complete, the device will
return the ACK and the master can then proceed with
the next Read or Write command. See Figure 7-1 for
flow diagram of this operation.
FIGURE 7-1:
ACKNOWLEDGE POLLING
FLOW
Send
Write Command
Send Stop
Condition to
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
Did Device
Acknowledge
(ACK = 0)?
No
Yes
Next
Operation
DS22184A-page 10
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
8.0
READ OPERATION
8.3
Read operations are initiated in the same way as write
operations, with the exception that the R/W bit of the
control byte is set to ‘1’. There are three basic types of
read operations: current address read, random read
and sequential read.
8.1
Current Address Read
The 24XX32AF contains an address counter that maintains the address of the last word accessed, internally
incremented by ‘1’. Therefore, if the previous read
access was to address ‘n’ (n is any legal address), the
next current address read operation would access data
from address n + 1.
Upon receipt of the control byte with R/W bit set to ‘1’,
the 24XX32AF issues an acknowledge and transmits
the 8-bit data word. The master will not acknowledge
the transfer, but does generate a Stop condition and the
24XX32AF discontinues transmission (Figure 8-1).
8.2
Sequential Read
Sequential reads are initiated in the same way as a
random read, except that once the 24XX32AF transmits the first data byte, the master issues an acknowledge as opposed to the Stop condition used in a
random read. This acknowledge directs the 24XX32AF
to transmit the next sequentially addressed 8-bit word
(Figure 8-3). Following the final byte transmitted to the
master, the master will NOT generate an acknowledge,
but will generate a Stop condition. To provide sequential reads, the 24XX32AF contains an internal Address
Pointer which is incremented by ‘1’ upon completion of
each operation. This Address Pointer allows the entire
memory contents to be serially read during one
operation. The internal Address Pointer will automatically roll over from address FFF to address 000 if the
master acknowledges the byte received from the array
address FFF.
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, the word address must
first be set. This is accomplished by sending the word
address to the 24XX32AF as part of a write operation
(R/W bit set to ‘0’). Once the word address is sent, the
master generates a Start condition following the
acknowledge. This terminates the write operation, but
not before the internal Address Pointer is set. The
master issues the control byte again, but with the R/W
bit set to a ‘1’. The 24XX32AF will then issue an
acknowledge and transmit the 8-bit data word. The
master will not acknowledge the transfer, but does
generate a Stop condition which causes the
24XX32AF to discontinue transmission (Figure 8-2).
After a random Read command, the internal address
counter will point to the address location following the
one that was just read.
FIGURE 8-1:
CURRENT ADDRESS READ
Bus Activity
Master
S
T
A
R
T
SDA Line
S
Bus Activity
© 2009 Microchip Technology Inc.
Control
Byte
S
T
O
P
Data (n)
P
A
C
K
N
O
A
C
K
DS22184A-page 11
24AA32AF/24LC32AF
FIGURE 8-2:
Bus Activity
Master
RANDOM READ
S
T
A
R
T
Control
Byte
Address
High Byte
AA
xxxx
S1010A
2100
A
C
Bus Activity
K
x = “don’t care” bit
S
T
A
R
T
Address
Low Byte
Bus Activity
Master
S
T
O
P
Data
Byte
S 1 0 1 0 A A A1
210
SDA Line
FIGURE 8-3:
Control
Byte
A
C
K
A
C
K
P
N
O
A
C
K
A
C
K
SEQUENTIAL READ
Control
Byte
Data n
Data n + 1
Data n + 2
Data n + x
S
T
O
P
P
SDA Line
Bus Activity
DS22184A-page 12
A
C
K
A
C
K
A
C
K
A
C
K
N
O
A
C
K
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
9.0
PACKAGING INFORMATION
9.1
Package Marking Information
8-Lead PDIP (300 mil)
XXXXXXXX
T/XXXNNN
YYWW
8-Lead SOIC (3.90 mm)
XXXXXXXT
XXXXYYWW
NNN
8-Lead TSSOP
Example:
24LC32AF
I/P e3 13F
0527
Example:
4LC32AFI
SN e3 0527
13F
Example:
XXXX
4LAF
TYWW
I527
NNN
13F
8-Lead MSOP
XXXXXT
YWWNNN
8-Lead 2x3 TDFN
XXX
YWW
NN
5-Lead SOT-23
XXNN
© 2009 Microchip Technology Inc.
Example:
4L32FI
52713F
Example:
AH4
527
I3
Example:
6QNN
DS22184A-page 13
24AA32AF/24LC32AF
1st Line Marking Codes
Part Number
TSSOP
MSOP
TDFN
I Temp.
SOT-23
E Temp.
I Temp.
E Temp.
24AA32A
4AAF
4A32FT
AH1
—
6PNN
—
24LC32A
4LAF
4L32FT
AH4
AH5
6QNN
6RNN
Note:
T = Temperature grade (I, E).
Legend: XX...X
T
Y
YY
WW
NNN
e3
Note:
Part number or part number code
Temperature (I, E)
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code (2 characters for small packages)
Pb-free JEDEC designator for Matte Tin (Sn)
Note:
For very small packages with no room for the Pb-free JEDEC designator
e3 , the marking will only appear on the outer carton or reel label.
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
Please visit www.microchip.com/Pbfree for the latest information on Pb-free conversion.
*Standard OTP marking consists of Microchip part number, year code, week code, and traceability code.
DS22184A-page 14
© 2009 Microchip Technology Inc.
24AA32AF/24LC32AF
3
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