CAT24C00
128-bit Serial EEPROM
FEATURES
I
400 kHz I
2
C bus compatible*
I
1.8 to 5.5 volt operation
I
Low power CMOS technology
I
Self-timed write cycle with auto-clear
I
1,000,000 Program/erase cycles
I
100 year data retention
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
I
8-pin DIP, 8-pin SOIC, 8 pin TSSOP and SOT-23
I
Industrial and Extended Temperature Ranges
DESCRIPTION
The CAT24C00 is a 128-bit Serial CMOS EEPROM
internally organized as 16 words of 8 bits each. Catalyst’s
advanced CMOS technology substantially reduces
device power requirements. The device operates via the
I
2
C bus serial interface and is available in 8-pin DIP,
8-pin SOIC, 8-pin TSSOP and 5-pin SOT-23.
PIN CONFIGURATION
DIP Package (P, L)
NC
NC
NC
VSS
1
2
3
4
8
7
6
5
VCC
NC
SCL
SDA
BLOCK DIAGRAM
SOIC Package (J, W)
EXTERNAL LOAD
NC
NC
NC
VSS
1
2
3
4
8
7
6
5
VCC
NC
SCL
SDA
DOUT
ACK
VCC
VSS
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SOT-23 (TP, TB)
SCL
VSS
SDA
1
2
3
4
NC
5
VCC
TSSOP Package (U, Y)
SDA
NC
NC
NC
VSS
1
2
3
4
8
7
6
5
VCC
NC
SCL
SDA
START/STOP
LOGIC
XDEC
CONTROL
LOGIC
E
2
PROM
PIN FUNCTIONS
Pin Name
SDA
SCL
NC
V
CC
V
SS
Function
Serial Data/Address
Serial Clock
No Connect
1.8 V to 5.5 V Power Supply
Ground
SCL
STATE COUNTERS
HIGH VOLTAGE/
TIMING CONTROL
DATA IN STORAGE
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I
2
C Bus Protocol.
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1027, Rev. M
CAT24C00
ABSOLUTE MAXIMUM RATINGS*
Temperature Under Bias ................. –55°C to +125°C
Storage Temperature ....................... –65°C to +150°C
Voltage on Any Pin with
Respect to Ground
(1)
............ –2.0 V to V
CC
+ 2.0 V
V
CC
with Respect to Ground ............. –2.0 V to +7.0 V
Package Power Dissipation
Capability (T
A
= 25°C) .................................. 1.0 W
Lead Soldering Temperature (10 seconds) ...... 300°C
Output Short Circuit Current
(2)
....................... 100 mA
RELIABILITY CHARACTERISTICS
Symbol
N
END(3)
T
DR(3)
V
ZAP(3)
I
LTH(3)(4)
Parameter
Endurance
Data Retention
ESD Susceptibility
Latch-up
*COMMENT
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.
Reference Test Method
MIL-STD-883, Test Method 1033
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 3015
JEDEC Standard 17
Min
1,000,000
100
2000
100
Typ
Max
Units
Cycles/Byte
Years
Volts
mA
D.C. OPERATING CHARACTERISTICS
V
CC
= 1.8 V to 5.5 V, unless otherwise specified.
Symbol
I
CC
I
SB(5)
I
LI
I
LO
V
IL
V
IH
V
OL1
V
OL2
Parameter
Power Supply Current
Standby Current (V
CC
= 5.0 V)
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (V
CC
= 3.0 V)
Output Low Voltage (V
CC
= 1.8 V)
Test Conditions
f
SCL
= 400 kHz
V
IN
= GND or V
CC
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
Min
Typ
Max
2
0
10
10
Units
mA
µA
µA
µA
V
V
V
V
–1
V
CC
x 0.7
I
OL
= 3 mA
I
OL
= 1.5 mA
V
CC
x 0.3
V
CC
+ 0.5
0.4
0.5
CAPACITANCE
T
A
= 25°C, f = 1.0 MHz, V
CC
= 5 V
Symbol
C
I/O(3)
C
IN(3)
Parameter
Input/Output Capacitance (SDA)
Input Capacitance (SCL)
Test Conditions
V
I/O
= 0 V
V
IN
= 0 V
Min
Typ
Max
8
6
Units
pF
pF
Note:
(1) The minimum DC input voltage is – 0.5 V. During transitions, inputs may undershoot to – 2.0 V for periods of less than 20 ns. Maximum
DC voltage on output pins is V
CC
+ 0.5 V, which may overshoot to V
CC
+ 2.0 V for periods of less than 20 ns.
(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 – 1 V to V
CC
+ 1 V.
(5) Standby Current, I
SB
= 0
µA
(<900 nA).
Doc. No. 1027, Rev. M
2
CAT24C00
A.C. CHARACTERISTICS
V
CC
= 1.8 V to 5.5 V, unless otherwise specified.
Read & Write Cycle Limits
Symbol
Parameter
1.8 V - 6.0 V
Min
F
SCL
T
I(1)
t
AA
t
BUF(1)
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R(1)
t
F(1)
t
SU:STO
t
DH
Clock Frequency
Noise Suppression Time
Constant at SCL, SDA Inputs
SCL Low to SDA Data Out
and ACK Out
Time the Bus Must be Free Before
a New Transmission Can Start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time
(for a Repeated Start Condition)
Data In Hold Time
Data In Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Condition Setup Time
Data Out Hold Time
4
100
4.7
4
4.7
4
4.7
0
50
1
300
0.6
100
Max
100
100
3.5
1.2
0.6
1.2
0.6
0.6
0
50
0.3
300
2.5 V - 6.0 V
Min
Max
400
100
1
Units
kHz
ns
µs
µs
µs
µs
µs
µs
ns
ns
µs
ns
µs
ns
Power-Up Timing
(1)(2)
Symbol
t
PUR
t
PUW
Parameter
Power-up to Read Operation
Power-up to Write Operation
Min
Typ
Max
1
1
Units
ms
ms
Write Cycle Limits
Symbol
t
WR
Parameter
Write Cycle Time
Min
Typ
Max
5
Units
ms
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
interface circuits are disabled, SDA is allowed to remain
high, and the device does not respond to its slave
address.
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the specified operation can be initiated.
3
Doc. No. 1027, Rev. M
CAT24C00
FUNCTIONAL DESCRIPTION
The CAT24C00 supports the I
2
C 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 CAT24C00 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.
SDA:
Serial Data/Address
The CAT24C00 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.
I
2
C BUS PROTOCOL
The following defines the features of the I
2
C bus protocol:
(1) Data transfer may be initiated only when the bus is
not busy.
(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.
PIN DESCRIPTIONS
SCL:
Serial Clock
The CAT24C00 serial clock input pin is used to clock all
data transfers into or out of the device. This is an input
pin.
Figure 1. Bus Timing
tF
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tHIGH
tLOW
tR
tSU:DAT
tSU:STO
SDA IN
tAA
SDA OUT
5020 FHD F03
tDH
tBUF
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
5020 FHD F05
START BIT
Doc. No. 1027, Rev. M
STOP BIT
4
CAT24C00
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 CAT24C00 monitors the
SDA and SCL lines and will not respond until this
condition is met.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
The CAT24C00 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 8-
bit byte.
When the CAT24C00 is in 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 CAT24C00 will continue to transmit data. If no
acknowledge is sent by the Master, the device terminates
data transmission and waits for a STOP condition.
DEVICE ADDRESSING
The bus 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
as 1010 for the CAT24C00 (see Fig. 5). The next three
significant bits are "don't care" bits. 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.
After the Master sends a START condition and the slave
address byte, the CAT24C00 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT24C00 then performs a Read or Write operation
depending on the state of the R/W bit.
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.
Figure 4. Acknowledge Timing
WRITE OPERATION
Byte Write
In the 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 CAT24C00. After receiving another acknowledge
from the Slave, the Master device transmits the data
byte to be written into the addressed memory location.
The CAT24C00 acknowledges once more and the
Master generates the STOP condition, at which time the
device begins its internal programming cycle to
nonvolatile memory. While this internal cycle is in
progress, the device will not respond to any request
from the Master device.
After a write command, the internal address counter
will continue to point to the same address location
that was just written. If a stop bit is transmitted to the
device at any point in the write sequence before the
entire sequence is complete, then the command will
abort and no data will be written. If more than eight
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACKNOWLEDGE
5020 FHD F06
5
Doc. No. 1027, Rev. M
下载中心专版
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
