ON CAV24C64 64-kb i2c cmos serial eeprom Datasheet

CAV24C64
64-Kb I2C CMOS Serial
EEPROM
Description
The CAV24C64 is a 64−Kb CMOS Serial EEPROM device,
internally organized as 8192 words of 8 bits each.
It features a 32−byte page write buffer and supports the Standard
(100 kHz) and Fast (400 kHz) I2C protocol.
External address pins make it possible to address up to eight
CAV24C64 devices on the same bus.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Automotive Temperature Grade 1 (−40°C to +125°C)
Supports Standard and Fast I2C Protocol
2.5 V to 5.5 V Supply Voltage Range
32−Byte Page Write Buffer
Hardware Write Protection for Entire Memory
CAV Prefix for Automotive and Other Applications Requiring Site
and Change Control
Schmitt Triggers and Noise Suppression Filters on I2C Bus Inputs
(SCL and SDA)
Low Power CMOS Technology
1,000,000 Program/Erase Cycles
100 Year Data Retention
SOIC, TSSOP 8−lead Packages
This Device is Pb−Free, Halogen Free/BFR Free, and RoHS
Compliant
SCL
CAV24C64
SOIC−8
W SUFFIX
CASE 751BD
SDA
TSSOP−8
Y SUFFIX
CASE 948AL
PIN CONFIGURATION
A0
1
VCC
A1
WP
A2
SCL
VSS
SDA
SOIC (W), TSSOP (Y)
For the location of Pin 1, please consult the
corresponding package drawing.
PIN FUNCTION
Pin Name
A0, A1, A2
VCC
A2, A1, A0
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Function
Device Address Input
SDA
Serial Data Input/Output
SCL
Serial Clock Input
WP
Write Protect Input
VCC
Power Supply
VSS
Ground
WP
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
VSS
Figure 1. Functional Symbol
© Semiconductor Components Industries, LLC, 2011
March, 2011 − Rev. 0
1
Publication Order Number:
CAV24C64/D
CAV24C64
DEVICE MARKINGS
(TSSOP−8)
(SOIC−8)
C64F
AYMXXX
G
C64F
A
Y
M
XXX
G
24C64F
AYMXXX
G
= Specific Device Code
= Assembly Location
= Production Year (Last Digit)
= Production Month (1-9, O, N, D)
= Last Three Digits of Assembly Lot Number
= Pb−Free Package
24C64F
A
Y
M
XXX
G
= Specific Device Code
= Assembly Location
= Production Year (Last Digit)
= Production Month (1-9, O, N, D)
= Last Three Digits of Assembly Lot Number
= Pb−Free Package
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
Storage Temperature
–65 to +150
°C
Voltage on Any Pin with Respect to Ground (Note 1)
–0.5 to +6.5
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. During input transitions, voltage undershoot on any pin should not exceed −1 V for more than 20 ns. Voltage overshoot on pins A0, A1, A2
and WP should not exceed VCC + 1 V for more than 20 ns, while voltage on the I2C bus pins, SCL and SDA, should not exceed the absolute
maximum ratings, irrespective of VCC.
Table 2. RELIABILITY CHARACTERISTICS (Note 2)
Symbol
Parameter
NEND (Note 3)
TDR
Endurance
Min
Units
1,000,000
Program/Erase Cycles
100
Years
Data Retention
2. These parameters are tested initially and after a design or process change that affects the parameter according to appropriate AEC−Q100
and JEDEC test methods.
3. Page Mode, VCC = 5 V, 25°C.
Table 3. D.C. OPERATING CHARACTERISTICS
(VCC = 2.5 V to 5.5 V, TA = −40°C to +125°C, unless otherwise specified.)
Symbol
Parameter
Test Conditions
Min
Max
Units
ICCR
Read Current
Read, fSCL = 400 kHz
1
mA
ICCW
Write Current
Write, fSCL = 400 kHz
2
mA
5
mA
2
mA
−0.5
0.3 x VCC
V
V
ISB
Standby Current
All I/O Pins at GND or VCC
IL
I/O Pin Leakage
Pin at GND or VCC
TA = −40°C to +125°C
VIL
Input Low Voltage
VIH
Input High Voltage
A0, A1, A2 and WP
0.7 x VCC
VCC + 0.5
SCL and SDA
0.7 x VCC
5.5
VOL
Output Low Voltage
VCC > 2.5 V, IOL = 3 mA
0.4
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2
V
CAV24C64
Table 4. PIN IMPEDANCE CHARACTERISTICS (VCC = 2.5 V to 5.5 V, TA = −40°C to +125°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Max
Units
8
pF
CIN (Note 4)
SDA I/O Pin Capacitance
VIN = 0 V, TA = 25°C
CIN (Note 4)
Input Capacitance (other pins)
VIN = 0 V, TA = 25°C
6
pF
IWP (Note 5)
WP Input Current
VIN < VIH, VCC = 5.5 V
130
mA
VIN < VIH, VCC = 3.3 V
120
VIN < VIH, VCC = 2.5 V
80
VIN > VIH
2
VIN < VIH, VCC = 5.5 V
50
VIN < VIH, VCC = 3.3 V
35
VIN < VIH, VCC = 2.5 V
25
VIN > VIH
2
IA (Note 5)
Address Input Current
(A0, A1, A2)
Product Rev F
mA
4. These parameters are tested initially and after a design or process change that affects the parameter according to appropriate AEC−Q100
and JEDEC test methods.
5. When not driven, the WP, A0, A1 and A2 pins are pulled down to GND internally. For improved noise immunity, the internal pull−down is relatively
strong; therefore the external driver must be able to supply the pull−down current when attempting to drive the input HIGH. To conserve power,
as the input level exceeds the trip point of the CMOS input buffer (~ 0.5 x VCC), the strong pull−down reverts to a weak current source.
Table 5. A.C. CHARACTERISTICS (VCC = 2.5 V to 5.5 V, TA = −40°C to +125°C, unless otherwise specified.) (Note 6)
Standard
Symbol
FSCL
tHD:STA
Min
Parameter
Clock Frequency
Max
Fast
Min
100
START Condition Hold Time
Max
Units
400
kHz
4
0.6
ms
tLOW
Low Period of SCL Clock
4.7
1.3
ms
tHIGH
High Period of SCL Clock
4
0.6
ms
4.7
0.6
ms
tSU:STA
START Condition Setup Time
tHD:DAT
Data In Hold Time
0
0
ms
tSU:DAT
Data In Setup Time
250
100
ns
tR
SDA and SCL Rise Time
1000
300
ns
tF (Note 6)
SDA and SCL Fall Time
300
300
ns
tSU:STO
STOP Condition Setup Time
tBUF
Bus Free Time Between STOP and START
tAA
SCL Low to Data Out Valid
tDH
Data Out Hold Time
Ti (Note 6)
4
0.6
ms
4.7
1.3
ms
3.5
100
Noise Pulse Filtered at SCL and SDA Inputs
0.9
100
100
ms
ns
100
ns
tSU:WP
WP Setup Time
0
0
ms
tHD:WP
WP Hold Time
2.5
2.5
ms
tWR
tPU (Notes 7, 8)
Write Cycle Time
5
5
ms
Power−up to Ready Mode
1
1
ms
6. Test conditions according to “AC Test Conditions” table.
7. Tested initially and after a design or process change that affects this parameter.
8. tPU is the delay between the time VCC is stable and the device is ready to accept commands.
Table 6. A.C. TEST CONDITIONS
Input Levels
0.2 x VCC to 0.8 x VCC
Input Rise and Fall Times
≤ 50 ns
Input Reference Levels
0.3 x VCC, 0.7 x VCC
Output Reference Levels
0.5 x VCC
Output Load
Current Source: IOL = 3 mA; CL = 100 pF
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3
CAV24C64
I2C Bus Protocol
Power-On Reset (POR)
Each CAV24C64 incorporates Power-On Reset (POR)
circuitry which protects the internal logic against powering
up in the wrong state. The device will power up into Standby
mode after VCC exceeds the POR trigger level and will
power down into Reset mode when VCC drops below the
POR trigger level. This bi-directional POR behavior
protects the device against ‘brown-out’ failure following a
temporary loss of power.
The 2-wire I2C bus consists of two lines, SCL and SDA,
connected to the VCC supply via pull-up resistors. The
Master provides the clock to the SCL line, and either the
Master or the Slaves drive the SDA line. A ‘0’ is transmitted
by pulling a line LOW and a ‘1’ by letting it stay HIGH. Data
transfer may be initiated only when the bus is not busy (see
A.C. Characteristics). During data transfer, SDA must
remain stable while SCL is HIGH.
START/STOP Condition
Pin Description
SCL: The Serial Clock input pin accepts the clock signal
generated by the Master.
SDA: The Serial Data I/O pin accepts input data and delivers
output data. In transmit mode, this pin is open drain. Data is
acquired on the positive edge, and is delivered on the
negative edge of SCL.
A0, A1 and A2: The Address inputs set the device address
that must be matched by the corresponding Slave address
bits. The Address inputs are hard-wired HIGH or LOW
allowing for up to eight devices to be used (cascaded) on the
same bus. When left floating, these pins are pulled LOW
internally.
WP: When pulled HIGH, the Write Protect input pin
inhibits all write operations. When left floating, this pin is
pulled LOW internally.
An SDA transition while SCL is HIGH creates a START
or STOP condition (Figure 2). The START consists of a
HIGH to LOW SDA transition, while SCL is HIGH. Absent
the START, a Slave will not respond to the Master. The
STOP completes all commands, and consists of a LOW to
HIGH SDA transition, while SCL is HIGH.
Device Addressing
The Master addresses a Slave by creating a START
condition and then broadcasting an 8-bit Slave address. For
the CAV24C64, the first four bits of the Slave address are set
to 1010 (Ah); the next three bits, A2, A1 and A0, must match
the logic state of the similarly named input pins. The R/W
bit tells the Slave whether the Master intends to read (1) or
write (0) data (Figure 3).
Acknowledge
During the 9th clock cycle following every byte sent to the
bus, the transmitter releases the SDA line, allowing the
receiver to respond. The receiver then either acknowledges
(ACK) by pulling SDA LOW, or does not acknowledge
(NoACK) by letting SDA stay HIGH (Figure 4). Bus timing
is illustrated in Figure 5.
Functional Description
The CAV24C64 supports the Inter-Integrated Circuit (I2C)
Bus protocol. The protocol relies on the use of a Master
device, which provides the clock and directs bus traffic, and
Slave devices which execute requests. The CAV24C64
operates as a Slave device. Both Master and Slave can
transmit or receive, but only the Master can assign those roles.
SCL
SDA
START
CONDITION
STOP
CONDITION
Figure 2. Start/Stop Timing
1
0
1
0
A2
A1
A0
DEVICE ADDRESS
Figure 3. Slave Address Bits
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R/W
CAV24C64
BUS RELEASE DELAY (TRANSMITTER)
SCL FROM
MASTER
1
BUS RELEASE DELAY (RECEIVER)
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACK SETUP (≥ tSU:DAT)
ACK DELAY (≤ tAA)
Figure 4. Acknowledge Timing
tHIGH
tF
tLOW
tR
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
tSU:STO
SDA IN
tAA
tDH
tBUF
SDA OUT
Figure 5. Bus Timing
WRITE OPERATIONS
Byte Write
Acknowledge Polling
To write data to memory, the Master creates a START
condition on the bus and then broadcasts a Slave address
with the R/W bit set to ‘0’. The Master then sends two
address bytes and a data byte and concludes the session by
creating a STOP condition on the bus. The Slave responds
with ACK after every byte sent by the Master (Figure 6). The
STOP starts the internal Write cycle, and while this
operation is in progress (tWR), the SDA output is tri-stated
and the Slave does not acknowledge the Master (Figure 7).
As soon (and as long) as internal Write is in progress, the
Slave will not acknowledge the Master. This feature enables
the Master to immediately follow-up with a new Read or
Write request, rather than wait for the maximum specified
Write time (tWR) to elapse. Upon receiving a NoACK
response from the Slave, the Master simply repeats the
request until the Slave responds with ACK.
Hardware Write Protection
With the WP pin held HIGH, the entire memory is
protected against Write operations. If the WP pin is left
floating or is grounded, it has no impact on the Write
operation. The state of the WP pin is strobed on the last
falling edge of SCL immediately preceding the 1st data byte
(Figure 9). If the WP pin is HIGH during the strobe interval,
the Slave will not acknowledge the data byte and the Write
request will be rejected.
Page Write
The Byte Write operation can be expanded to Page Write,
by sending more than one data byte to the Slave before
issuing the STOP condition (Figure 8). Up to 32 distinct data
bytes can be loaded into the internal Page Write Buffer
starting at the address provided by the Master. The page
address is latched, and as long as the Master keeps sending
data, the internal byte address is incremented up to the end
of page, where it then wraps around (within the page). New
data can therefore replace data loaded earlier. Following the
STOP, data loaded during the Page Write session will be
written to memory in a single internal Write cycle (tWR).
Delivery State
The CAV24C64 is shipped erased, i.e., all bytes are FFh.
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CAV24C64
BUS ACTIVITY: S
T
A
MASTER R
T
ADDRESS
BYTE
SLAVE
ADDRESS
ADDRESS
BYTE
DATA
BYTE
a7 − a0
d7 − d0
a15 − a8
S
S
T
O
P
P
* * *
A
C
K
SLAVE
*a15 − a13 are don’t care bits.
A
C
K
A
C
K
A
C
K
Figure 6. Byte Write Sequence
SCL
SDA
8th Bit
Byte n
ACK
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
Figure 7. Write Cycle Timing
BUS
ACTIVITY: S
T
A
MASTER R
T
SLAVE
ADDRESS
ADDRESS
BYTE
DATA
BYTE
n
ADDRESS
BYTE
DATA
BYTE
n+1
S
T
O
P
DATA
BYTE
n+P
S
P
A
C
K
SLAVE
A
C
K
A
C
K
A
C
K
A
C
K
Figure 8. Page Write Sequence
ADDRESS
BYTE
DATA
BYTE
1
8
a7
a0
9
1
8
d7
d0
SCL
SDA
tSU:WP
WP
tHD:WP
Figure 9. WP Timing
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A
C
K
A
C
K
CAV24C64
READ OPERATIONS
Immediate Read
Write sequence by sending data, the Master then creates a
START condition and broadcasts a Slave address with the
R/W bit set to ‘1’. The Slave responds with ACK after every
byte sent by the Master and then sends out data residing at
the selected address. After receiving the data, the Master
responds with NoACK and then terminates the session by
creating a STOP condition on the bus (Figure 11).
To read data from memory, the Master creates a START
condition on the bus and then broadcasts a Slave address
with the R/W bit set to ‘1’. The Slave responds with ACK
and starts shifting out data residing at the current address.
After receiving the data, the Master responds with NoACK
and terminates the session by creating a STOP condition on
the bus (Figure 10). The Slave then returns to Standby mode.
Sequential Read
Selective Read
If, after receiving data sent by the Slave, the Master
responds with ACK, then the Slave will continue
transmitting until the Master responds with NoACK
followed by STOP (Figure 12). During Sequential Read the
internal byte address is automatically incremented up to the
end of memory, where it then wraps around to the beginning
of memory.
To read data residing at a specific address, the selected
address must first be loaded into the internal address register.
This is done by starting a Byte Write sequence, whereby the
Master creates a START condition, then broadcasts a Slave
address with the R/W bit set to ‘0’ and then sends two
address bytes to the Slave. Rather than completing the Byte
BUS ACTIVITY: S
T
A
MASTER R
T
N
O
S
A T
CO
K P
SLAVE
ADDRESS
S
P
A
C
K
SLAVE
SCL
8
SDA
DATA
BYTE
9
8th Bit
DATA OUT
NO ACK
STOP
Figure 10. Immediate Read Sequence and Timing
BUS ACTIVITY: S
T
A
MASTER R
T
ADDRESS
BYTE
SLAVE
ADDRESS
S
T
A
R
T
ADDRESS
BYTE
S
N
O
A
C
K
SLAVE
ADDRESS
S
A
C
K
SLAVE
A
C
K
P
A
C
K
A
C
K
DATA
BYTE
Figure 11. Selective Read Sequence
N
O
A
C
K
BUS ACTIVITY:
MASTER
A
C
K
SLAVE
ADDRESS
A
C
K
A
C
K
S
T
O
P
P
SLAVE
A
C
K
DATA
BYTE
n
DATA
BYTE
n+1
DATA
BYTE
n+2
Figure 12. Sequential Read Sequence
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S
T
O
P
DATA
BYTE
n+x
CAV24C64
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
E1
E
SYMBOL
MIN
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
MAX
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
e
PIN # 1
IDENTIFICATION
NOM
4.00
1.27 BSC
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
END VIEW
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
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CAV24C64
PACKAGE DIMENSIONS
TSSOP8, 4.4x3
CASE 948AL−01
ISSUE O
b
SYMBOL
MIN
NOM
A
E1
E
MAX
1.20
A1
0.05
A2
0.80
b
0.19
0.15
0.90
1.05
0.30
c
0.09
D
2.90
3.00
3.10
E
6.30
6.40
6.50
E1
4.30
4.40
4.50
0.20
e
0.65 BSC
L
1.00 REF
L1
0.50
θ
0º
0.60
0.75
8º
e
TOP VIEW
D
A2
c
q1
A
A1
L1
SIDE VIEW
L
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-153.
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CAV24C64
Example of Ordering Information
CAV24C64WE−GT3 (Note 11)
Prefix
Device #
Suffix
CAV
24C64
W
E
−G
T3
Temperature Range
Lead Finish
E = Automotive (−40°C to +125°C)
G: NiPdAu
Tape & Reel (Note 13)
T: Tape & Reel
3: 3,000 / Reel
Company ID
Product Number
24C64
Package
W: SOIC, JEDEC
Y: TSSOP
9. All packages are RoHS-compliant (Lead-free, Halogen-free).
10. The standard lead finish is NiPdAu.
11. The device used in the above example is a CAV24C64WE−GT3 (SOIC, Automotive Temperature, NiPdAu, Tape & Reel, 3,000/Reel).
12. For other package options, please contact your nearest ON Semiconductor Sales office.
13. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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For additional information, please contact your local
Sales Representative
CAV24C64/D
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