CATALYST CAT34WC02P-1.8

CAT34WC02
2K-Bit I2C Serial EEPROM, Serial Presence Detect
FEATURES
■ 400 KHz (5V) and 100 KHz (1.8V) I2C bus
■ Self-timed write cycle with auto-clear
compatible
■ Software write protection for lower 128 bytes
■ 1.8 to 6.0 volt operation
■ 1,000,000 program/erase cycles
■ Low power CMOS technology
■ 100 year data retention
– zero standby current
■ 8-pin DIP, 8-pin SOIC and 8-pin TSSOP packages
■ 16-byte page write buffer
■ 256 x 8 memory organization
■ Commercial, industrial and automotive
■ Hardware write protect
temperature ranges
DESCRIPTION
The CAT34WC02 is a 2K-bit Serial CMOS EEPROM
internally organized as 256 words of 8 bits each. Catalyst’s
advanced CMOS technology substantially reduces device power requirements. The CAT34WC02 features a
16-byte page write buffer. The device operates via the
I2C bus serial interface and is available in 8-pin DIP, 8pin SOIC or 8-pin TSSOP packages.
PIN CONFIGURATION
BLOCK DIAGRAM
SOIC Package (J)
DIP Package (P)
1
2
3
4
A0
A1
A2
VSS
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
EXTERNAL LOAD
SENSE AMPS
SHIFT REGISTERS
DOUT
ACK
VCC
WP
SCL
SDA
VCC
VSS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
TSSOP Package (U)
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
SDA
VCC
WP
SCL
SDA
START/STOP
LOGIC
XDEC
WP
E2PROM
CONTROL
LOGIC
PIN FUNCTIONS
Pin Name
Function
A0, A1, A2
Device Address Inputs
SDA
Serial Data/Address
SCL
Serial Clock
WP
Write Protect
VCC
+1.8V to +6.0V Power Supply
VSS
Ground
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
SCL
A0
A1
A2
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
24CXX F03
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc No. 1003, Rev. A
CAT34WC02
ABSOLUTE MAXIMUM RATINGS*
*COMMENT
Temperature Under Bias
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation of
the device at these or any other conditions outside of those
listed in the operational sections of this specification is not
implied. Exposure to any absolute maximum rating for
extended periods may affect device performance and
reliability.
–55°C to +125°C
Storage Temperature ....................... –65°C to +150°C
Voltage on Any Pin with
Respect to Ground(1) ........... –2.0V to +VCC + 2.0V
VCC with Respect to Ground ............... –2.0V to +7.0V
Package Power Dissipation
Capability (Ta = 25°C) ................................... 1.0W
Lead Soldering Temperature (10 secs) ............ 300°C
Output Short Circuit Current(2) ........................ 100mA
RELIABILITY CHARACTERISTICS
Symbol
NEND
(3)
Parameter
Min.
Endurance
Max.
Units
Reference Test Method
1,000,000
Cycles/Byte
MIL-STD-883, Test Method 1033
TDR(3)
Data Retention
100
Years
MIL-STD-883, Test Method 1008
VZAP(3)
ESD Susceptibility
2000
Volts
MIL-STD-883, Test Method 3015
Latch-up
100
mA
ILTH
(3)(4)
JEDEC Standard 17
D.C. OPERATING CHARACTERISTICS
VCC = +1.8V to +6.0V, unless otherwise specified.
Limits
Symbol
Parameter
Min.
Typ.
Max.
Units
Test Conditions
ICC
Power Supply Current (Read)
1
mA
fSCL = 100 KHz
ICC
Power Supply Current (Write)
3
mA
fSCL = 100 KHz
ISB(5)
Standby Current (VCC = 5.0V)
0
µA
VIN = GND or VCC
ILI
Input Leakage Current
1
µA
VIN = GND to VCC
ILO
Output Leakage Current
1
µA
VOUT = GND to VCC
VIL
Input Low Voltage
–1
VCC x 0.3
V
VIH
Input High Voltage
VCC x 0.7
VCC + 1.0
V
VOL1
Output Low Voltage (VCC = 3.0V)
0.4
V
IOL = 3 mA
VOL2
Output Low Voltage (VCC = 1.8V)
0.5
V
IOL = 1.5 mA
CAPACITANCE TA = 25°C, f = 1.0 MHz, VCC = 5V
Symbol
CI/O
CIN
(3)
(3)
Test
Max.
Units
Conditions
Input/Output Capacitance (SDA)
8
pF
VI/O = 0V
Input Capacitance (A0, A1, A2, SCL)
6
pF
VIN = 0V
Note:
(1) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20 ns. Maximum DC
voltage on output pins is VCC +0.5V, which may overshoot to VCC + 2.0V for periods of less than 20ns.
(2) Output shorted for no more than one second. No more than one output shorted at a time.
(3) This parameter is tested initially and after a design or process change that affects the parameter.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to VCC +1V.
(5) Standby Current (ISB) = 0µA (<900nA).
Doc. No. 1003, Rev. A
2
CAT34WC02
A.C. CHARACTERISTICS
VCC = +1.8V to +6.0V, unless otherwise specified.
Read & Write Cycle Limits
Symbol
Parameter
1.8V, 2.5V
Min.
Max.
4.5V-5.5V
Min.
Max.
Units
FSCL
Clock Frequency
100
400
kHz
TI(1)
Noise Suppression Time
Constant at SCL, SDA Inputs
200
200
ns
tAA
SCL Low to SDA Data Out
and ACK Out
3.5
1
µs
tBUF(1)
Time the Bus Must be Free Before
a New Transmission Can Start
tHD:STA
Start Condition Hold Time
tLOW
4.7
1.2
µs
4
0.6
µs
Clock Low Period
4.7
1.2
µs
tHIGH
Clock High Period
4
0.6
µs
tSU:STA
Start Condition Setup Time
(for a Repeated Start Condition)
4.7
0.6
µs
tHD:DAT
Data In Hold Time
0
0
ns
tSU:DAT
Data In Setup Time
50
50
ns
tR(1)
SDA and SCL Rise Time
1
0.3
µs
tF(1)
SDA and SCL Fall Time
300
300
ns
tSU:STO
Stop Condition Setup Time
tDH
Data Out Hold Time
4
0.6
µs
100
100
ns
Power-Up Timing(1)(2)
Symbol
Parameter
Max.
Units
tPUR
Power-up to Read Operation
1
ms
tPUW
Power-up to Write Operation
1
ms
Write Cycle Limits
Symbol
Parameter
tWR
Write Cycle Time
Min.
Typ.
Max
Units
4
10
ms
interface circuits are disabled, SDA is allowed to remain
high, and the device does not respond to its slave
address.
The write cycle time is the time from a valid stop
condition of a write sequence to the end of the internal
program/erase cycle. During the write cycle, the bus
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated.
3
Doc No. 1003, Rev. A
CAT34WC02
FUNCTIONAL DESCRIPTION
all data transfers into or out of the device. This is an input
pin.
The CAT34WC02 supports the I2C Bus data transmission protocol. This Inter-Integrated Circuit Bus protocol
defines any device that sends data to the bus to be a
transmitter and any device receiving data to be a receiver. Data transfer is controlled by the Master device
which generates the serial clock and all START and
STOP conditions for bus access. The CAT34WC02
operates as a Slave device. Both the Master and Slave
devices can operate as either transmitter or receiver, but
the Master device controls which mode is activated. A
maximum of 8 devices may be connected to the bus as
determined by the device address inputs A0, A1, and A2.
SDA: Serial Data/Address
The CAT34WC02 bidirectional serial data/address pin
is used to transfer data into and out of the device. The
SDA pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs.
A0, A1, A2: Device Address Inputs
These inputs set device address when cascading multiple devices. A maximum of eight devices can be
cascaded when using the device.
WP: Write Protect
This input, when tied to GND, allows write operations to
the entire memory. For CAT34WC02 when this pin is
tied to VCC, the entire array of memory is write protected.
When left floating, memory is unprotected.
PIN DESCRIPTIONS
SCL: Serial Clock
The CAT34WC02 serial clock input pin is used to clock
Figure 1. Bus Timing
tF
tHIGH
tLOW
tR
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
tSU:STO
SDA IN
tAA
tBUF
tDH
SDA OUT
5020 FHD F03
Figure 2. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
5020 FHD F04
Figure 3. Start/Stop Timing
SDA
SCL
START BIT
Doc. No. 1003, Rev. A
STOP BIT
4
5020 FHD F05
CAT34WC02
I2C BUS PROTOCOL
and define which device the Master is accessing. Up to
eight CAT34WC02 may be individually addressed by
the system. The last bit of the slave address specifies
whether a Read or Write operation is to be performed.
When this bit is set to 1, a Read operation is selected,
and when set to 0, a Write operation is selected.
The following defines the features of the I2C bus protocol:
(1) Data transfer may be initiated only when the bus is
not busy.
After the Master sends a START condition and the slave
address byte, the CAT34WC02 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT34WC02 then performs a Read or a Write operation
depending on the state of the R/W bit.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any changes
in the data line while the clock line is high will be
interpreted as a START or STOP condition.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT34WC02 monitor the
SDA and SCL lines and will not respond until this
condition is met.
Acknowledge
After a successful data transfer, each receiving device is
required to generate an acknowledge. The Acknowledging device pulls down the SDA line during the ninth clock
cycle, signaling that it received the 8 bits of data.
STOP Condition
The CAT34WC02 responds with an acknowledge after
receiving a START condition and its slave address. If the
device has been selected along with a write operation,
it responds with an acknowledge after receiving each
byte.
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
DEVICE ADDRESSING
When the CAT34WC02 begins a READ mode, it transmits 8 bits of data, releases the SDA line, and monitors
the line for an acknowledge. Once it receives this acknowledge, the CAT34WC02 will continue to transmit
data. If no acknowledge is sent by the Master, the device
terminates data transmission and waits for a STOP
condition.
The Master begins a transmission by sending a START
condition. The Master then sends the address of the
particular slave device it is requesting. The four most
significant bits of the 8-bit slave address are fixed
(except when accessing the Write Protect Register) as
1010 for the CAT34WC02 (see Fig. 5). The next three
significant bits (A2, A1, A0) are the device address bits
Figure 4. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACKNOWLEDGE
5020 FHD F06
Figure 5. Slave Address Bits
1
0
1
0
A2
A1
A0
R/W
Normal Read and Write
R/W
Programming the Write
Protect Register
DEVICE ADDRESS
0
1
1
0
A2
A1
5
A0
34WC02 F07
Doc No. 1003, Rev. A
CAT34WC02
Once all 16 bytes are received and the STOP condition
has been sent by the Master, the internal programming
cycle begins. At this point all received data is written to
the CAT34WC02 in a single write cycle.
WRITE OPERATIONS
Byte Write
In the Byte Write mode, the Master device sends the
START condition and the slave address information
(with the R/W bit set to zero) to the Slave device. After
the Slave generates an acknowledge, the Master sends
the byte address that is to be written into the address
pointer of the CAT34WC02. After receiving another
acknowledge from the Slave, the Master device transmits the data byte to be written into the addressed
memory location. The CAT34WC02 acknowledges once
more and the Master generates the STOP condition, at
which time the device begins its internal programming to
nonvolatile memory. While this internal cycle is in
progress, the device will not respond to any request from
the Master device.
Acknowledge Polling
The disabling of the inputs can be used to take advantage of the typical write cycle time. Once the stop
condition is issued to indicate the end of the host’s write
operation, the CAT34WC02 initiates the internal write
cycle. ACK polling can be initiated immediately. This
involves issuing the start condition followed by the slave
address for a write operation. If the CAT34WC02 is still
busy with the write operation, no ACK will be returned.
If the CAT34WC02 has completed the write operation,
an ACK will be returned and the host can then proceed
with the next read or write operation.
Page Write
WRITE PROTECTION
The CAT34WC02 writes up to 16 bytes of data in a single
write cycle, using the Page Write operation. The Page
Write operation is initiated in the same manner as the
Byte Write operation, however instead of terminating
after the initial word is transmitted, the Master is allowed
to send up to 15 additional bytes. After each byte has
been transmitted the CAT34WC02 will respond with an
acknowledge, and internally increment the low order
address bits by one. The high order bits remain unchanged.
The CAT34WC02 is designed with a hardware protect
pin that enables the user to protect the entire memory.
The CAT34WC02 also has a software write protection
feature. By programming the software write protection
register, the first 128 bytes are write protected. The
software and hardware protection features of the
CAT34WC02 are designed into the part to provide
added flexibility to the design engineers.
Hardware
If the Master transmits more than 16 bytes prior to
sending the STOP condition, the address counter ‘wraps
around’, and previously transmitted data will be overwritten.
Figure 6. Byte Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
The write protection feature of CAT34WC02 allows the
user to protect against inadvertent programming of the
memory array. If the WP pin is tied to Vcc, the entire
SLAVE
ADDRESS
BYTE
ADDRESS
S
T
O
P
DATA
S
P
A
C
K
A
C
K
A
C
K
5020 FHD F08
Figure 7. Page Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
BYTE
ADDRESS (n)
S
DATA n
DATA n+1
DATA n+P
P
*
A
C
K
A
C
K
A
C
K
NOTE: IN THIS EXAMPLE n = XXXX 0000(B); X = 1 or 0
Doc. No. 1003, Rev. A
S
T
O
P
6
A
C
K
A
C
K
5020 FHD F09
CAT34WC02
memory array is protected and becomes read only. The
entire memory becomes write protected regardless of
whether the write protect register has been written or
not. When WP pin is tied to Vcc, the user cannot program
the write protect register. If the WP pin is left floating or
tied to Vss, the device can be written into (except the first
128 bytes if the write protect register is programmed).
ceives its slave address information (with the R/W bit set
to one), it issues an acknowledge, then transmits the 8bit byte requested. The master device does not send an
acknowledge but will generate a STOP condition.
Selective Read
Selective READ operations allow the Master device to
select at random any memory location for a READ
operation. The Master device first performs a ‘dummy’
write operation by sending the START condition, slave
address and byte address of the location it wishes to
read. After the CAT34WC02 acknowledge the word
address, the Master device resends the START condition and the slave address, this time with the R/W bit set
to one. The CAT34WC02 then responds with its acknowledge and sends the 8-bit byte requested. The
master device does not send an acknowledge but will
generate a STOP condition.
Software
The software protection on the CAT34WC02 protects
the first 128 bytes of the memory array permanently.
Software write protect is implemented by programming
the write protect register. A user can write only once to
the write protect register and once written it is irreversible (even if you reset the CAT34WC02).
The write protection register is written by sending a
regular byte write command with the slave address set
to 0110 instead of 1010. After the initial acess to the
register, the device will not acknowledge any further
access to this register.
Sequential Read
The Sequential READ operation can be initiated by
either the Immediate Address READ or Selective READ
operations. After the CAT34WC02 sends the initial 8-bit
data requested, the Master will respond with an acknowledge which tells the device it requires more data.
The CAT34WC02 will continue to output a byte for each
acknowledge sent by the Master. The operation will
terminate operation when the Master fails to respond
with an acknowledge, thus sending the STOP condition.
READ OPERATIONS
The READ operation for the CAT34WC02 is initiated in
the same manner as the write operation with the one
exception that the R/W bit is set to a one. Three different
READ operations are possible: Immediate Address
READ, Selective READ and Sequential READ.
The data being transmitted from the CAT34WC02 is
outputted sequentially with data from address N followed by data from address N+1. The READ operation
address counter increments all of the CAT34WC02
address bits so that the entire memory array can be read
during one operation. If more than the 256 bytes are read
out, the counter will “wrap around” and continue to clock
out data bytes.
Immediate Address Read
The CAT34WC02’s address counter contains the address of the last byte accessed, incremented by one. In
other words, if the last READ or WRITE access was to
address N, the READ immediately following would access data from address N+1. If N = 255 for 34WC02,
then the counter will ‘wrap around’ to address 0 and
continue to clock out data. After the CAT34WC02 reFigure 8. Immediate Address Read Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
S
P
A
C
K
N
O
DATA
K
SCL
SDA
8
A
C
K
9
8TH BIT
DATA OUT
NO ACK
7
STOP
5020 FHD F10
Doc No. 1003, Rev. A
CAT34WC02
Figure 9. Memory Array
FFH
Hardware Write Protectable
(by connecting WP pin to
Vcc)
7FH
Software Write Protectable
(by programming the write
protect register)
00H
Figure 10. Software Write Protect
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
S
S
T
O
P
BYTE
ADDRESS
DATA
XXXXXXXX
XXXXXXXX
A
C
K
A
C
K
P
A
C
K
X = Don't Care
Figure 11. Selective Read Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
S
T
A
R
T
BYTE
ADDRESS (n)
S
S
T
O
P
SLAVE
ADDRESS
S
*
A
C
K
P
A
C
K
A
C
K
DATA n
N
O
A
C
K
5020 FHD F11
Figure 12. Sequential Read Timing
BUS ACTIVITY:
MASTER
SLAVE
ADDRESS
DATA n
DATA n+1
DATA n+2
S
T
O
P
DATA n+x
SDA LINE
P
A
C
K
A
C
K
A
C
K
A
C
K
N
O
A
C
K
5020 FHD F12
Doc. No. 1003, Rev. A
8
CAT34WC02
ORDERING INFORMATION
Prefix
Device #
CAT
34WC02
Optional
Company ID
Product
Number
Suffix
J
-1.8
I
Temperature Range
Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
A = Automotive (-40˚ - 105˚C)*
Package
P: PDIP
J: SOIC (JEDEC)
U: TSSOP
TE13
Tape & Reel
TE13: 2000/Reel
Operating Voltage
Blank: 2.5V - 6.0V
1.8: 1.8V - 6.0V
34WC02 F14
* -40˚ to +125˚C is available upon request
Notes:
(1) The device used in the above example is a 34WC02JI-1.8TE13 (SOIC, Industrial Temperature, 1.8 Volt to 6 Volt Operating
Voltage, Tape & Reel)
9
Doc No. 1003, Rev. A
Catalyst Semiconductor, Inc.
Corporate Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Fax: 408.542.1200
www.catsemi.com
Publication #:
Revison:
Issue date:
Type:
1003
A
04/25/01
Final