CAT24FC65, CAT24FC66
64K-Bit I
2
C Serial CMOS EEPROM with Partial Array Write Protection
FEATURES
I
Fast mode I
2
C bus compatible*
I
Max clock frequency:
I
5 ms max write cycle time
I
Write protect feature
- 400KHz for VCC=2.5V to 5.5V
I
Schmitt trigger filtered inputs for
noise suppression
I
Low power CMOS technology
I
64-byte page write buffer
I
Self-timed write cycle with auto-clear
I
Industrial and automotive temperature ranges
– Bottom 1/4 array protected when WP at V
IH
(CAT24FC65)
– Top 1/4 array protected when WP at V
IH
(CAT24FC66)
I
1,000,000 program/erase cycles
I
100 year data retention
I
8-pin DIP, 8-pin SOIC (JEDEC), 8-pin SOIC
(EIAJ), 8-pin TSSOP and TDFN packages
DESCRIPTION
The CAT24FC65/66 is a 64k-bit Serial CMOS EEPROM
internally organized as 8,192 words of 8 bits each.
Catalyst’s advanced CMOS technology substantially
reduces device power requirements.
PIN CONFIGURATION
DIP Package (P, L, GL)
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
1
A1
2
A2
3
VSS
4
TDFN Package (RD2, ZD2)
8
VCC
7
WP
SOIC Package
(J, W, K, X, GW, GX)
A0
A1
A2
VSS
1
2
3
4
PIN FUNCTIONS
Pin Name
A0, A1, A2
SDA
SCL
WP
D
s
i
6
5
8
7
VCC
A0
WP
A1
SCL
A2
SDA
VSS
o
c
1
2
3
4
(Top View)
TSSOP Package (U, Y, GY)
SDA
i
t
n
6
SCL
5
SDA
u
n
VCC
VSS
WP
The CAT24FC65/66 features a 64-byte page write
buffer. The device operates via the I
2
C bus serial
interface and is available in 8-pin DIP, SOIC, TSSOP
and TDFN packages.
BLOCK DIAGRAM
EXTERNAL LOAD
d
e
ACK
START/STOP
LOGIC
CONTROL
LOGIC
a
P
s
t
r
DOUT
SENSE AMPS
SHIFT REGISTERS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
512
8
7
6
5
VCC
WP
SCL
SDA
XDEC
128
EEPROM
128X512
Function
Address Inputs
Serial Data/Address
DATA IN STORAGE
Serial Clock
Write Protect
+2.5V to +5.5V Power Supply
Ground
No Connect
SCL
A0
A1
A2
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
HIGH VOLTAGE/
TIMING CONTROL
V
CC
V
SS
NC
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I
2
C Bus Protocol.
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1047, Rev. H
CAT24FC65/66
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)
........... –2.0V to +V
CC
+ 2.0V
V
CC
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
*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.
RELIABILITY CHARACTERISTICS
(3)
Symbol
N
END
T
DR
V
ZAP
I
LTH(4)
Parameter
Endurance
Data Retention
ESD Susceptibility
Latch-up
Min
1,000,000
100
4000
100
Typ
D.C. OPERATING CHARACTERISTICS
V
CC
= +2.5V to +5.5V, unless otherwise specified.
Symbol
I
CC1
I
CC2
I
SB(5)
I
LI
I
LO
V
IL
V
IH
V
OL1
Parameter
Power Supply Current - Read
Power Supply Current - Write
Standby Current
Input Leakage Current
Test Conditions
f
SCL
= 400 KHz
V
CC
=5V
f
SCL
= 400KHz
V
CC
=5V
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (V
CC
= +3.0V)
CAPACITANCE
T
A
= 25°C, f = 1.0 MHz, V
CC
= 5V
Symbol
Test
C
I/O(3)
C
IN(3)
Z
WPL
Input/Output Capacitance (SDA)
Input Capacitance (SCL, WP, A0, A1)
WP Input Impedance
WP Input Impedance
Z
WPH
D
s
i
o
c
i
t
n
V
IN
= GND or V
CC
V
CC
=5V
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
u
n
Conditions
V
I/O
= 0V
V
IN
= 0V
V
IN
≤
0.5V
V
IN
>0.7VxV
CC
d
e
Min
-0.5
V
CC
x 0.7
Min
Typ
a
P
Max
Max
400
3
1
1
1
V
CC
x 0.3
0.4
Cycles/Byte
Years
Volts
mA
s
t
r
Units
Units
µA
mA
µA
µA
µA
V
V
V
V
CC
+ 0.5
I
OL
= 3.0 mA
Typ
Max
8
6
Units
pF
pF
kΩ
kΩ
5
500
70
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 V
CC
+0.5V, which may overshoot to V
CC
+ 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) 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.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to V
CC
+1V.
(5) Standby current (I
SB
) = 10
µA
max at extended temperature range.
Doc. No. 1047, Rev. H
2
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24FC65/66
A.C. CHARACTERISTICS
V
CC
= +2.5V to +5.5V, unless otherwise specified
Output Load is 1 TTL Gate and 100pF
Read & Write Cycle Limits
Symbol
Parameter
VCC=2.5V - 5.5V
Min
F
SCL
t
AA
t
BUF(2)
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R(2)
t
F(2)
t
SU:STO
t
DH
t
WR
t
SP
t
SU;WP
t
HD;WP
Clock Frequency
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
50
1300
600
Max
400
900
1300
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
Write Cycle Time
Input Suppresssion (SDA, SCL)
WP Setup Time
Power-Up Timing
(2)(3)
Symbol
t
PUR
Note:
(1) AC measurement conditions:
RL (connects to V
CC
): 0.3V
CC
to 0.7 V
CC
Input rise and fall times: < 50ns
Input and output timing reference voltages: 0.5 V
CC
(2) This parameter is tested initially and after a design or process change that affects the parameter.
(3) t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the specified operation can be initiated.
D
t
PUW
s
i
WP Hold Time
Parameter
o
c
i
t
n
u
n
d
e
600
600
0
100
a
P
300
300
5
50
s
t
r
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
Units
600
50
60 0
1300
Min
Typ
Max
1
1
Units
ms
ms
Power-Up to Read Operation
Power-Up to Write Operation
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
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
interface circuits are disabled, SDA is allowed to remain
high, and the device does not respond to its slave
address.
3
Doc No. 1047, Rev. H
CAT24FC65/66
FUNCTIONAL DESCRIPTION
The CAT24FC65/66 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. The transfer is controlled by the Master device
which generates the serial clock and all START and
STOP conditions for bus access. The CAT24FC65/66
operates as a Slave device. Both the Master device and
Slave device can operate as either transmitter or receiver,
but the Master device controls which mode is activated.
SDA: Serial Data/Address
The bidirectional serial data/address pin is used to
transfer all 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.
WP: Write Protect
This input, when tied to GND, allows write operations to
the entire memory. When this pin is tied to Vcc, the
bottom/top (CAT24FC65/CAT24FC66)1/4 of memory
is write protected. When left floating, memory is
unprotected.
PIN DESCRIPTIONS
SCL: Serial Clock
The serial clock input clocks all data transferred into or
out of the device.
A0, A1, A2: Device Address Inputs
These pins are hardwired or left connected. When
hardwired, up to eight CAT24FC65/66's may be
addressed on a single bus system. When the pins are
left unconnected, the default values are zero.
Figure 1. Bus Timing
tF
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tHIGH
tLOW
tR
SDA IN
SDA OUT
Figure 2. Write Cycle Timing
SCL
SDA
Figure 3. Start/Stop Timing
D
s
i
SDA
SCL
o
c
8TH BIT
BYTE n
i
t
n
tAA
ACK
u
n
tDH
tWR
tSU:DAT
d
e
a
P
tSU:STO
tBUF
s
t
r
STOP
CONDITION
START
CONDITION
ADDRESS
START BIT
STOP BIT
Doc. No. 1047, Rev. H
4
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24FC65/66
I
2
C BUS PROTOCOL
The features of the I
2
C bus protocol are defined as
follows:
(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.
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 CAT24FC65/66 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.
allow as many as eight devices on the same bus. These
bits must compare to their hardwired input pins. 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 CAT24FC65/66 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT24FC65/66 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.
The CAT24FC65/66 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.
DEVICE ADDRESSING
The bus Master begins a transmission by sending a
START condition. The Master 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 (Fig. 5). The CAT24FC65/66 uses the next three
bits as address bits. The address bits A2, A1 and A0
Figure 4. Acknowledge Timing
D
s
i
DATA OUTPUT
FROM TRANSMITTER
o
c
SCL FROM
MASTER
i
t
n
1
u
n
When the CAT24FC65/66 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 CAT24FC65/66 will continue to
d
e
8
a
P
9
s
t
r
DATA OUTPUT
FROM RECEIVER
START
ACKNOWLEDGE
Figure 5. Slave Address Bits
1
0
1
0
A2
A1
A0
R/W
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 1047, Rev. H
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