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CAT24FC02 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT24FC02
Beschreibung 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 10 Seiten
CAT24FC02 Datasheet, Funktion
CAT24FC02
2-kb I2C Serial EEPROM
FEATURES
I 400 kHz (2.5 V) I2C bus compatible
I 2.5 to 5.5 volt operation
I Low power CMOS technology
I 16-byte page write buffer
I Industrial and extended temperature ranges
I Self-timed write cycle with auto-clear
I 1,000,000 program/erase cycles
I 100 year data retention
I 8-pin DIP, SOIC, TSSOP and MSOP packages
- “Green” package option available
I 256 x 8 memory organization
I Hardware write protect
DESCRIPTION
The CAT24FC02 is a 2-kb Serial CMOS EEPROM
internally organized as 256 words of 8 bits each. Catalyst’s
advanced CMOS technology substantially reduces
device power requirements.
The CAT24FC02 features a 16-byte page write buffer.
The device operates via the I2C bus serial interface and
is available in 8-pin DIP, SOIC, TSSOP and MSOP
packages.
PIN CONFIGURATION
DIP Package (P, L, GL) SOIC Package (J, W, GW)
A0
A1
A2
VSS
1
2
3
4
8 VCC
A0
7 WP
A1
6 SCL
A2
5 SDA VSS
1
2
3
4
8
7
6
5
TSSOP Package (U, Y, GY)
A0
A1
A2
VSS
1
2
3
4
8 VCC
7 WP
6 SCL
5 SDA
MSOP Package (R, Z, GZ)
VCC
WP
SCL
SDA
A0
A1
A2
VSS
1
2
3
4
8 VCC
7 WP
6 SCL
5 SDA
PIN FUNCTIONS
Pin Name
Function
A0, A1, A2
Device Address Inputs
SDA
Serial Data/Address
SCL Serial Clock
WP Write Protect
VCC 2.5 V to 5.5 V Power Supply
VSS Ground
BLOCK DIAGRAM
EXTERNAL LOAD
VCC
VSS
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SDA
START/STOP
LOGIC
XDEC
E2PROM
WP CONTROL
LOGIC
SCL
A0
A1
A2
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
* Catalyst Semiconductor is licensed by Philips Corporation to carry
the I2C Bus Protocol.
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1045, Rev. G






CAT24FC02 Datasheet, Funktion
CAT24FC02
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 CAT24FC02. After receiving another
acknowledge from the Slave, the Master device transmits
the data byte to be written into the addressed memory
location. The CAT24FC02 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.
Page Write
The CAT24FC02 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 CAT24FC02 will respond with an
acknowledge, and internally increment the low order
address bits by one. The high order bits remain
unchanged.
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.
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 CAT24FC02 in a single write cycle.
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 hosts write operation,
the CAT24FC02 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 CAT24FC02 is still busy with
the write operation, no ACK will be returned. If the
CAT24FC02 has completed the write operation, an ACK
will be returned and the host can then proceed with the
next read or write operation.
WRITE PROTECTION
The CAT24FC02 is designed with a hardware protect
pin that enables the user to protect the entire memory.
Thehardware protection feature of the CAT24FC02 is
designed into the part to provide added flexibility to the
design engineers. The write protection feature of
CAT24FC02 allows the user to protect against inadvertent
programming of the memory array. If the WP pin is tied
to Vcc, the entire 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.
Figure 6. Byte Write Timing
BUS ACTIVITY:
MASTER
S
T
A
R
T
SLAVE
ADDRESS
BYTE
ADDRESS
DATA
S
T
O
P
SDA LINE S
P
AAA
CCC
KKK
Figure 7. Page Write Timing
S
T
BUS ACTIVITY: A
SLAVE
MASTER R ADDRESS
T
BYTE
ADDRESS (n)
DATA n
DATA n+1
SDA LINE S
*
AA
CC
KK
AA
CC
KK
DATA n+P
S
T
O
P
P
A
C
K
NOTE: IN THIS EXAMPLE n = XXXX 0000(B); X = 1 or 0
Doc. No. 1072, Rev. G
6
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

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