ETC 24C08

Turbo IC, Inc.
24C08
CMOS I²C 2-WIRE BUS
8K ELECTRICALLY ERASABLE PROGRAMMABLE ROM
1K X 8 BIT EEPROM
FEATURES :
• Extended Power Supply Voltage
Single Vcc for Read and Programming
(Vcc = 2.7 V to 5.5 V)
• Low Power (Isb = 2µa @ 5.5 V)
• I²C Bus, 2-Wire Serial Interface
• Support Byte Write and Page Write (16 Bytes)
• Automatic Page write Operation (maximum 10 ms)
Internal Control Timer
Internal Data Latches for 16 Bytes
• High Reliability CMOS Technology with EEPROM Cell
Endurance : 1,000,000 Cycles
Data Retention : 100 Years
DESCRIPTION:
The Turbo IC 24C08 is a serial 8K EEPROM fabricated with
Turbo’s proprietary, high reliability, high performance CMOS
technology. It’s 8K of memory is organized as 1,024 x 8 bits.
The memory is configured as 64 pages with each page containing 16 bytes. This device offers significant advantages
in low power and low voltage applications.
The Turbo IC 24C08 uses the I²C addressing protocol and
2-wire serial interface which includes a bidirectional serial
data bus synchronized by a clock. It offers a flexible byte
write and a faster 16-byte page write.
The Turbo IC 24C08 is assembled in either a 8-pin PDIP or
8-pin SOIC package. Pin #1, #2 and #7 are not connected
(NC). Pin #3 is the A2 device address input for the 24C08,
such that a total of two 24C08 devices can be connected on
a single bus. Pin #4 is the ground (Vss). Pin #5 is the serial
data (SDA) pin used for bidirectional transfer of data. Pin #6
is the serial clock (SCL) input pin. Pin #8 is the power supply (Vcc) pin.
PIN DESCRIPTION
NC
1
8
VCC
NC
1
8
NC
2
7
NC
NC
2
7
A2
3
6
SCL
A2
3
6
GND
4
5
SDA
GND
4
5
8 pin SOIC
8 pin PDIP
All data is serially transmitted in bytes (8 bits) on the SDA
bus. To access the Turbo IC 24C08 (slave) for a read or
write operation, the controller (master) issues a start condiVCC tion by pulling SDA from high to low while SCL is high. The
master then issues the device address byte which consists
NC
of 1010 (A2) (B9) (B8) (R/W). The most significant bits (1010)
SCL are a device type code signifying an EEPROM device. A2 is
SDA the device address select bit which has to match the A2 pin
input on the 24C08 device. The B[9:8] bits are the 2 most
significant bits of the memory address. The read/write bit
determines whether to do a read or write operation. After
each byte is transmitted, the receiver has to provide an acknowledge by pulling the SDA bus low on the ninth clock
cycle. The acknowledge is a handshake signal to the transmitter indicating a successful data transmission.
PIN DESCRIPTION
DEVICE ADDRESS (A2)
A2 is a device address input that enables a total
of two 24C08 devices to connect on a single bus.
When the address input pin is left unconnected,
it is interpreted as zero.
SERIAL DATA (SDA)
SDA is a bidirectional pin used to transfer data
in and out of the Turbo IC 24C08. The pin is an
open-drain output. A pullup resistor must be connected from SDA to Vcc.
1
SERIAL CLOCK (SCL)
The SCL input synchronizes the data on the SDA
bus. It is used in conjunction with SDA to define
the start and stop conditions. It is also used in
conjunction with SDA to transfer data to and from
the Turbo IC 24C08.
Turbo IC, Inc.
24C08
DESCRIPTION (Continued):
For a write operation, the master issues a start condition, a
device address byte, a memory address byte, and then up to
16 data bytes. The Turbo IC 24C08 acknowledges after each
byte transmission. To terminate the transmission, the master
issues a stop condition by pulling SDA from low to high while
SCL is high.
For a read operation, the master issues a start condition and
a device address byte. The Turbo IC 24C08 acknowledges,
and then transmits a data byte, which is accessed from the
EEPROM memory. The master acknowledges, indicating that
it requires more data bytes. The Turbo IC 24C08 transmits
more data bytes, with the memory address counter automatically incrementing for each data byte, until the master
does not acknowledge, indicating that it is terminating the
transmission. The master then issues a stop condition.
DEVICE OPERATION:
BIDIRECTIONAL BUS PROTOCOL:
The Turbo IC 24C08 follows the I²C bus protocol. The protocol defines any device that sends data onto the SDA bus as
a transmitter, and the receiving device as a receiver. The
device controlling the transfer is the master and the device
being controlled is the slave. The master always initiates the
data transfers, and provides the clock for both transmit and
receive operations. The Turbo IC 24C08 acts as a slave device in all applications. Either the master or the slave can
take control of the SDA bus, depending on the requirement
of the protocol.
ACKNOWLEDGE:
All data is serially transmitted in bytes (8 bits) on the SDA
bus. The acknowledge protocol is used as a handshake signal to indicate successful transmission of a byte of data. The
bus transmitter, either the master or the slave (Turbo IC
24C08), releases the bus after sending a byte of data on the
SDA bus. The receiver pulls the SDA bus low during the ninth
clock cycle to acknowledge the successful transmission of a
byte of data. If the SDA is not pulled low during the ninth
clock cycle, the Turbo IC 24C08 terminates the data transmission and goes into standby mode.
START/STOP CONDITION AND DATA TRANSITIONS:
While SCL clock is high, a high to low transition on the SDA
bus is recognized as a START condition which precedes any
read or write operation. While SCL clock is high, a low to
high transition on the SDA bus is recognized as a STOP condition which terminates the communication and places the
Turbo IC 24C08 into standby mode. All other data transitions
on the SDA bus must occur while SCL clock is low to ensure
proper operation.
For the write operation, the Turbo IC 24C08 acknowledges
after the device address byte, acknowledges after the memory
address byte, and acknowledges after each subsequent data
byte.
For the read operation, the Turbo IC 24C08 acknowledges
after the device address byte. Then the Turbo IC 24C08 transmits each subsequent data byte, and the master acknowledges after each data byte transfer, indicating that it requires
more data bytes. The Turbo IC 24C08 monitors the SDA bus
for the acknowledge. To terminate the transmission, the master does not acknowledge, and then sends a stop condition.
Write Cycle Timing
SCL
SDA
8th BIT
WORD n
ACK
STOP
CONDITION
tWC
START
CONDITION
Note: The write cycle time tWC is the time from a valid stop condition of a write sequence to the end of the internal clear / write cycle.
2
Turbo IC, Inc.
24C08
Data Valid
SDA
SCL
DATA STABLE
DATA STABLE
DATA
CHANGE
Start and Stop Definition
SDA
SCL
STOP
START
Output Acknowledge
SCL
1
8
9
DATA IN
DATA OUT
START
ACKNOWLEDGE
3
Turbo IC, Inc.
24C08
DEVICE ADDRESSING:
Following the start condition, the master will issue a device
address byte consisting of 1010 (A2) (B9) (B8) (R/W) to access the selected Turbo IC 24C08 for a read or write operation. A2 is the device address select bit which has to match
the A2 pin input on the 24C08 device. The B[9:8] bits are the
2 most significant bits of the memory address. The (R/W) bit
is a high (1) for read and low (0) for write.
PAGE WRITE OPERATION:
The master initiates the page write operation by issuing a
start condition, followed by the device address byte 1010
(A2) (B9) (B8) 0, followed by the memory address byte, followed by up to 16 data bytes, followed by an acknowledge,
then a stop condition. After each byte transfer, the Turbo IC
24C08 acknowledges the successful data transmission by
pulling SDA low. After each data byte transfer, the memory
address counter is automatically incremented by one. The
stop condition starts the internal EEPROM write cycle only if
the stop condition occurs in the clock cycle immediately following the acknowledge (10th clock cycle). All inputs are disabled until the completion of the write cycle.
DATA INPUT DURING WRITE OPERATION:
During the write operation, the Turbo IC 24C08 latches the
SDA bus signal on the rising edge of the SCL clock.
DATA OUTPUT DURING READ OPERATION:
During the read operation, the Turbo IC 24C08 serially shifts
the data onto the SDA bus on the falling edge of the SCL
clock.
POLLING ACKNOWLEDGE:
During the internal write cycle of a write operation in the Turbo
IC 24C08, the completion of the write cycle can be detected
by polling acknowledge. The master starts acknowledge polling by issuing a start condition, then followed by the device
address byte 1010 (A2) (B9) (B8) 0. If the internal write cycle
is finished, the Turbo IC 24C08 acknowledges by pulling the
SDA bus low. If the internal write cycle is still ongoing, the
Turbo IC 24C08 does not acknowledge because it’s inputs
are disabled. Therefore, the device will not respond to any
command. By using polling acknowledge, the system delay
for write operations can be reduced. Otherwise, the system
needs to wait for the maximum internal write cycle time, tWC,
given in the spec.
MEMORY ADDRESSING:
The memory address is sent by the master in the form of 2
bytes. Device address A2 and memory address bits B[9:8],
are included in the device address byte. The remaining
memory address bits B[7:0] are included in the second byte.
The memory address byte can only be sent as part of a write
operation.
BYTE WRITE OPERATION:
The master initiates the byte write operation by issuing a
start condition, followed by the device address byte 1010
(A2) (B9) (B8) 0, followed by the memory address byte, followed by one data byte, followed by an acknowledge, then a
stop condition. After each byte transfer, the Turbo IC 24C08
acknowledges the successful data transmission by pulling
the SDA bus low. The stop condition starts the internal
EEPROM write cycle, and all inputs are disabled until the
completion of the write cycle.
POWER ON RESET:
The Turbo IC 24C08 has a Power On Reset circuit (POR) to
prevent data corruption and accidental write operations during power up. On power up, the internal reset signal is on
and the Turbo IC 24C08 will not respond to any command
until the VCC voltage has reached the POR threshold value.
4
Turbo IC, Inc.
24C08
Device Address
1
0
1
0
A2
B9
B8
R/W
MSB
LSB
Byte Write
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E
WORD ADDRESS
S
T
O
P
DATA
SDA LINE
M
S
B
L RA
S / C
B WK
A
C
K
A
C
K
Page Write
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E
WORD ADDRESS
DATA (n)
SDA LINE
M
S
B
L RA
S / C
B WK
A
C
K
5
A
C
K
//
//
S
T
O
P
DATA (n + x)
A
C
K
Turbo IC, Inc.
24C08
CURRENT ADDRESS READ:
The internal memory address counter of the Turbo IC 24C08
contains the last memory address accessed during the previous read or write operation, incremented by one. To start
the current address read operation, the master issues a start
condition, followed by the device address byte 1010 (A2) (B9)
(B8) 1. The Turbo IC 24C08 responds with an acknowledge
by pulling the SDA bus low, and then serially shifts out the
data byte accessed from memory at the location corresponding to the memory address counter. The master does not
acknowledge, then sends a stop condition to terminate the
read operation. It is noted that the memory address counter
is incremented by one after the data byte is shifted out.
an acknowledge by pulling the SDA bus low, and then serially shifts out the data byte accessed from memory at the
location corresponding to the memory address counter. The
master does not acknowledge, then sends a stop condition
to terminate the read operation. It is noted that the memory
address counter is incremented by one after the data byte is
shifted out.
SEQUENTIAL READ:
The sequential read is initiated by either a current address
read or random address read. After the Turbo IC 24C08 serially shifts out the first data byte, the master acknowledges
by pulling the SDA bus low, indicating that it requires additional data bytes. After the data byte is shifted out, the Turbo
IC 24C08 increments the memory address counter by one.
Then the Turbo IC 24C08 shifts out the next data byte. The
sequential reads continues for as long as the master keeps
acknowledging. When the memory address counter is at the
last memory location, the counter will ‘roll-over’ when
incremented by one to the first location in memory (address
zero). The master terminates the sequential read operation
by not acknowledging, then sends a stop condition.
RANDOM ADDRESS READ:
The master starts with a dummy write operation (one with no
data bytes) to load the internal memory address counter by
first issuing a start condition, followed by the device address
byte 1010 (A2) (B9) (B8) 0, followed by the memory address
bytes. Following the acknowledge from the Turbo IC 24C08,
the master starts the current read operation by issuing a start
condition, followed by the device address byte 1010 (A2) (B9)
(B8) 1. The Turbo IC 24C08 responds with
Current Address Read
S
T
A
R
T
DEVICE
ADDRESS
R
E
A
D
S
T
O
P
DATA
SDA LINE
M
S
B
L RA
S / C
B WK
N
O
A
C
K
Random Read
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E
WORD
ADDRESS N
DEVICE
ADDRESS
//
R
E
A
D
S
T
O
P
DATA n
SDA LINE
M
S
B
L RA
S / C
B WK
//
A
C
K
DUMMY WRITE
6
A
C
K
N
O
A
C
K
Turbo IC, Inc.
24C08
Sequential Read
S
T
A
R
T
R
E
A
D
DEVICE
ADDRESS
DATA n
DATA n + 2
DATA n +1
S
T
O
P
DATA n + 3
SDA LINE
M
S
B
L RA
S / C
B WK
A
C
K
A
C
K
N
O
A
C
K
A
C
K
ABSOLUTE MAXIMUM RATINGS
TEMPERATURE
Storage:
Under Bias:
RECOMMENDED OPERATING CONDITIONS
-65° C to 150° C
-55° C to 125° C
* “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 above those indicated in the operation section of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
0° C to 70° C
-40° C to 85° C
-55° C to 125° C
Temperature Range:
Commercial:
Industrial:
Military:
Vcc Supply Voltage:
2.7 to 5.5 Volts
4.5 to 5.5 Volts
Endurance:
Data Retention:
100,000 Cycles/Byte (Typical)
100 Years
ALL INPUT OR OUTPUT VOLTAGES
with respect to Vss
+6 V to -0.3 V
D.C. CHARACTERISTICS
Symbol
Parameter
Condition
Min
Icc1
Icc2
Isb1
Active Vcc Current
Active Vcc Current
Standby Current
Isb2
Standby Current
Iil
Iol
Vil
Vih
Vol2
Vol1
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low
Output Low
READ at 100 KHZ
WRITE at 100 KHZ
Vcc = 2.7 v
Vcc = 5.5 v
Vcc = 4.5 v
Vcc = 5.5 v
Vin=Vcc Max
-1.0
Vccx0.7
Vcc=3.0v Iol=2.1 mA
Vcc=2.7v Iol=-0.15 mA
7
Max
1.0
3.0
0.5
2.0
20.0
35.0
3
3
0.8
Vcc+0.5
0.4
0.25
Units
MA
MA
uA
uA
uA
uA
uA
uA
V
V
V
V
Turbo IC, Inc.
24C08
Bus Timing
t
F
tHIGH
t
LOW
SCL
t
R
t
LOW
t
HD.DAT
t
HD.STA
t
SU.STA
t
SU.DAT
t
SU.STO
SDA IN
tAA
tBUF
t
DH
SDA OUT
A.C. CHARACTERISTICS
Symbol
Parameter
2.7 volt
Min
SCL
T
tLOW
tHIGH
tAA
tBUF
tHD.STA
tSU.STA
tHD.DAT
tSU.DAT
tR
tF
tSU.STO
tDH
tWC
SCL Clock Frequency
Noise Suppression Time (1)
Clock Low Period
Clock High Period
SCL Low to SDA Data Out
Bus Free to New Start (1)
Start Hold Time
Start Set-up Time
Data-in Hold Time
Data-in Set-up Time
SCL and SDA Rise Time (1)
SCL and SDA Fall Time (1)
Stop Set-up Time
Data-out Hold Time
Write Cycle Time
4.7
4.0
0.1
4.7
4.0
4.7
0
200
1.0
300
4.7
100
10
5.5 volt
Max
100
100
Min
1.2
0.6
0.1
1.2
0.6
0.6
0
100
0.3
300
0.6
50
10
4.5
Max
400
100
0.9
Units
kHZ
ns
us
us
us
us
us
us
us
ns
us
ns
us
ns
ms
Note: 1 This parameter is characterized and not 100% tested.
Part Numbers & Order Information
TU24C08BS3I
TURBO IC PRODUCTS AND DOCUMENTS
1.
2.
3.
4.
All documents are subject to change without notice. Please contact Turbo IC for the latest
revision of documents.
Turbo IC does not assume any responsibility for any damage to the user that may result from
accidents or operation under abnormal conditions.
Turbo IC does not assume any responsibility for the use of any circuitry other than what
embodied in a Turbo IC product. No other circuits, patents, licenses are implied.
Turbo IC products are not authorized for use in life support systems or other critical systems
where component failure may endanger life. System designers should design with error
detection and correction, redundancy and back-up features.
1K X 8
Serial
EEPROM
2nd generation
Turbo IC, Inc. 2365 Paragon Drive, Suite I, San Jose, CA 95131 Phone: 408-392-0208
See us at www.turbo-ic.com
Package
Voltage
P -PDIP
S -SOIC
3 - 2.7V to 5.5V
- 4.5V to 5.5 V
Fax: 408-392-0207
Temperature
-Commercial
I -Industrial
Rev. 4.0-10/28/01