Preliminary Information
CAT34AC02
2K-Bit SMBus EEPROM for ACR Card Configuration
FEATURES
s
400 kHz (5V) and 100 kHz (1.8V) SMBus
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
Self-timed write cycle with auto-clear
s
1,000,000 program/erase cycles
s
100 year data retention
s
8-pin DIP, 8-pin SOIC and 8-pin TSSOP packages
s
256 x 8 memory organization
s
Hardware write protect
compatible
s
1.8 to 6.0 volt operation
s
Low power CMOS technology
– zero standby current
s
16-byte page write buffer
s
Industrial, automotive and extended
temperature ranges
DESCRIPTION
The CAT34AC02 is a 2K-bit Serial CMOS EEPROM
internally organized as 256 words of 8 bits each. Catalyst’s
advanced CMOS technology substantially reduces de-
vice power requirements. The CAT34AC02 features a
16-byte page write buffer. The device operates via the
SMBus serial interface for ACR card configuration and
is available in 8-pin DIP, 8-pin SOIC or 8-pin TSSOP
packages.
PIN CONFIGURATION
DIP Package (P, L)
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
A2
VSS
BLOCK DIAGRAM
SOIC Package (J, W)
EXTERNAL LOAD
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
DOUT
ACK
VCC
VSS
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
TSSOP Package (U, Y)
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
MSOP Package (R, Z)
1
2
3
4
8
7
6
5
WP
CONTROL
LOGIC
SDA
START/STOP
LOGIC
XDEC
E
2
PROM
PIN FUNCTIONS
Pin Name
A0, A1, A2
SDA
SCL
WP
V
CC
V
SS
Function
Device Address Inputs
Serial Data/Address
Serial Clock
Write Protect
+1.8V to +6.0V Power Supply
Ground
SCL
A0
A1
A2
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
HIGH VOLTAGE/
TIMING CONTROL
DATA IN STORAGE
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc No. 1025, Rev. E
CAT34AC02
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 (T
A
= 25°C) ................................... 1.0W
Lead Soldering Temperature (10 secs) ............ 300°C
Output Short Circuit Current
(2)
........................ 100mA
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
Min
Typ
Max
Units
Cycles/Byte
Years
Volts
mA
MIL-STD-883, Test Method 1033 1,000,000
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 3015
JEDEC Standard 17
100
2000
100
D.C. OPERATING CHARACTERISTICS
V
CC
= +1.8V to +6.0V, unless otherwise specified.
Symbol
I
CC
I
CC
I
SB(5)
I
LI
I
LO
V
IL
V
IH
V
OL1
V
OL2
Parameter
Power Supply Current (Read)
Power Supply Current (Write)
Standby Current (V
CC
= 5.0V)
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (V
CC
= 3.0V)
Output Low Voltage (V
CC
= 1.8V)
Test Conditions
f
SCL
= 100 kHz
f
SCL
= 100 kHz
V
IN
= GND or V
CC
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
Min
Typ
Max
1
3
0
10
10
Units
mA
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
= 5V
Symbol
C
I/O(3)
C
IN(3)
Parameter
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, A2, SCL)
Test Conditions
V
I/O
= 0V
V
IN
= 0V
Min
Typ
Max
8
6
Units
pF
pF
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) 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 V
CC
+1V.
(5) Standby Current (I
SB
) = 0µA (<900nA).
Doc. No. 1025, Rev. E
2
CAT34AC02
A.C. CHARACTERISTICS
V
CC
= +1.8V to +6.0V, unless otherwise specified.
Read & Write Cycle Limits
1.8V-6.0V, 2.5V - 6.0V
Symbol
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
Parameter
Min
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
Max
100
100
3.5
4.5V - 5.5V
Units
Min
Max
400
100
1
1.2
0.6
1.2
0.6
0.6
0
50
0.3
300
0.6
100
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
4
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. 1025, Rev. E
CAT34AC02
FUNCTIONAL DESCRIPTION
The CAT34AC02 supports the SMBus data transmission
protocol. This serial 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
CAT34AC02 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.
all data transfers into or out of the device. This is an input
pin.
SDA:
Serial Data/Address
The CAT34AC02 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 CAT34AC02 when this pin is tied
to V
CC
, the entire array of memory is write protected.
When left floating, memory is unprotected.
PIN DESCRIPTIONS
SCL:
Serial Clock
The CAT34AC02 serial clock input pin is used to clock
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
tDH
tBUF
Figure 2. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
Figure 3. Start/Stop Timing
SDA
SCL
START BIT
STOP BIT
Doc. No. 1025, Rev. E
4
CAT34AC02
SERIAL BUS PROTOCOL
The following defines the features of the ACR Serial 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.
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 CAT34AC02 monitor 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.
eight CAT34AC02 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.
After the Master sends a START condition and the slave
address byte, the CAT34AC02 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT34AC02 then performs a Read or a 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 CAT34AC02 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.
When the CAT34AC02 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 CAT34AC02 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 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
1011 for the CAT34AC02 (see Fig. 5). The next three
significant bits (A2, A1, A0) are the device address bits
and define which device the Master is accessing. Up to
Figure 4. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACKNOWLEDGE
Figure 5. Slave Address Bits
1
0
1
1
A2
A1
A0
R/W
DEVICE ADDRESS
5
Doc No. 1025, Rev. E
综合技术交流
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
