ETC CAT1023

Preliminary Information
H
CAT1021, CAT1022, CAT1023
EE
GEN FR
ALO
Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset
and Watchdog Timer
LE
A D F R E ETM
FEATURES
■ Precision power supply voltage monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
■ Built-in inadvertent write protection
— WP pin (CAT1021)
■ 1,000,000 Program/Erase cycles
■ Watchdog timer
■ Manual reset input
■ Active high or low reset
■ 100 year data retention
— Valid reset guaranteed at VCC = 1 V
2
■ 400kHz I C bus
■ 2.7V to 5.5V operation
■ Low power CMOS technology
■ 8-pin DIP, SOIC, TSSOP, MSOP or TDFN
(3 x 4.9 mm & 3 x 3 mm foot-print) packages
— TDFN max height is 0.8mm
■ Industrial and extended temperature ranges
■ 16-Byte page write buffer
DESCRIPTION
The CAT1021, CAT1022 and CAT1023 are complete
memory and supervisory solutions for microcontrollerbased systems. A 2k-bit serial EEPROM memory and a
system power supervisor with brown-out protection are
integrated together in low power CMOS technology.
Memory interface is via a 400kHz I2C bus.
The CAT1021 and CAT1023 provide a precision VCC
sense circuit and two open drain outputs: one (RESET)
drives high and the other (RESET) drives low whenever
VCC falls below the reset threshold voltage. The CAT1022
has only a RESET output and does not have a Write
Protect input. The CAT1021 also has a Write Protect
input (WP). Write operations are disabled if WP is
connected to a logic high.
All supervisors have a 1.6 second watchdog timer circuit
that resets a system to a known state if software or a
hardware glitch halts or “hangs” the system. For the
CAT1021 and CAT1022, the watchdog timer monitors
the SDA signal. The CAT1023 has a separate watchdog
timer interrupt input pin, WDI.
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
The power supply monitor and reset circuit protect memory
and system controllers during power up/down and against
brownout conditions. Five reset threshold voltages support
5V, 3.3V and 3V systems. If power supply voltages are out
of tolerance reset signals become active, preventing the
system microcontroller, ASIC or peripherals from operating.
Reset signals become inactive typically 200 ms after the
supply voltage exceeds the reset threshold level. With both
active high and low reset signals, interface to microcontrollers
and other ICs is simple. In addition, the RESET pin or a
separate input, MR, can be used as an input for push-button
manual reset capability.
The on-chip, 2k-bit EEPROM memory features a 16-byte
page. In addition, hardware data protection is provided by a
VCC sense circuit that prevents writes to memory whenever
VCC falls below the reset threshold or until VCC reaches the
reset threshold during power up.
Available packages include an 8-pin DIP and surface mount
8-pin SO, 8-pin TSSOP, 8-pin TDFN and 8-pin MSOP
packages. The TDFN package thickness is 0.8mm maximum.
TDFN footprint options are 3x3mm or 3x4.9mm (MSOP pad
layout).
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
Threshold Voltage Options
BLOCK DIAGRAM
Part Dash Minimum
Number Threshold
EXTERNAL LOAD
SENSE AMPS
SHIFT REGISTERS
DOUT
ACK
VCC
WORD ADDRESS
BUFFERS
VSS
SDA
COLUMN
DECODERS
START/STOP
LOGIC
Maximum
Threshold
-45
4.50
4.75
-42
4.25
4.50
-30
3.00
3.15
-28
2.85
3.00
-25
2.55
2.70
2kbit
EEPROM
XDEC
CONTROL
LOGIC
WP
(CAT1021)
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
RESET Controller
Precision
MR
Vcc Monitor
RESET
(CAT1021/23)
RESET
STATE COUNTERS
SCL
SLAVE
ADDRESS
COMPARATORS
WDI
(CAT1023)
PIN CONFIGURATION
DIP Package (P, L)
SOIC Package (S, V)
TSSOP Package (U, Y)
MSOP Package (R, Z)
MR 1
RESET 2
WP 3
8 VCC
CAT1021 7 RESET
6 SCL
5 SDA
VSS 4
(Bottom View)
TDFN Package: 3mm x 4.9mm
0.8mm maximum height - (RD2, ZD2)
VCC
RESET
8
1
MR
7
2
RESET
CAT1021
WP
SCL
6
3
WP
SDA
VSS
SDA
5
4
VSS
1
MR
2
RESET
6 SCL
SCL
VSS 4
5 SDA
SDA
MR 1
8 VCC
7 WDI
6 SCL
5 SDA
SDA
RESET 2
CAT1023
VSS 4
Doc. No. 3009, Rev. G
RESET
CAT1021
4
7
RESET 3
MR
2
3
8
NC 3
1
7
5
NC
CAT1022
8
6
VCC
RESET 2
VCC
RESET
SCL
8 VCC
7 NC
MR 1
(Bottom View)
TDFN Package: 3mm x 3mm
0.8mm maximum height - (RD4, ZD4)
CAT1022
VCC
8
1
MR
NC
7
2
RESET
NC
VSS
CAT1022
6
3
NC
SCL
6
3
5
4
VSS
SDA
5
4
VCC
8
1
MR
VCC 8
WDI
7
2
RESET
WDI 7
SCL
6
3
RESET
SCL 6
5
4
VSS
SDA 5
CAT1023
2
1 MR
2 RESET
CAT1023
3 RESET
4 V
SS
Preliminary Information
CAT1021, CAT1022, CAT1023
PIN DESCRIPTION
RESET/RESET
RESET: RESET OUTPUTS
RESET
(RESET CAT1021/23 Only)
These are open drain pins and RESET can be used as a
manual reset trigger input. By forcing a reset condition on
the pin the device will initiate and maintain a reset condition.
The RESET pin must be connected through a pull-down
resistor, and the RESET pin must be connected through a
pull-up resistor.
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.
SCL: SERIAL CLOCK
Serial clock input.
MR:
MANUAL RESET INPUT
Manual Reset input is a debounced input that can be
connected to an external source for Manual Reset.
Pulling the MR input low will generate a Reset condition.
Reset outputs are active while MR input is low and for
the reset timeout period after MR returns to high. The
input has an internal pull up resistor.
WP (CAT1021 Only): WRITE PROTECT INPUT
When WP input is tied to VSS or left unconnected write
operations to the entire array are allowed. When tied to
VCC, the entire array is protected. This input has an
internal pull down resistor.
WDI (CAT1023 Only): WATCHDOG TIMER INTERRUPT
Watchdog Timer Interrupt Input is used to reset the
watchdog timer. If a transition from high to low or low to
high does not occur every 1.6 seconds, the RESET
outputs will be driven active.
OPERATING TEMPERATURE RANGE
PIN FUNCTIONS
Pin Name
Function
Industrial
-40˚C to 85˚C
NC
No Connect
Extended
-40˚C to 125˚C
Independent
Auxiliary
Voltage Sense
RESET: Active
High and LOW
RESET
Active Low Reset Input/Output
VSS
Ground
SDA
Serial Data/Address
SCL
Clock Input
RESET
Active High Reset Output (CAT1021/23)
VCC
Power Supply
WP
Write Protect (CAT1021 only)
MR
Manual Reset Input
WDI
Watchdog Timer Interrupt (CAT1023)
CAT102X FAMILY OVERVIEW
Device
Manual
Reset
Input Pin
Watchdog
Watchdog
Monitor
Pin
Write
Protection
Pin
EEPROM
CAT1021
SDA
2k
CAT1022
SDA
2k
CAT1023
WDI
2k
CAT1024
2k
CAT1025
2k
CAT1026
2k
CAT1027
WDI
2k
For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
3
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
ABSOLUTE MAXIMUM RATINGS
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.
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 VCC + 2.0 V
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 20 ns.
(2) Output shorted for no more than one second. No more than
one output shorted at a time.
VCC with Respect to Ground ................ –2.0V to 7.0 V
Package Power Dissipation
Capability (TA = 25°C) .................................. 1.0 W
Lead Soldering Temperature (10 secs) ............ 300°C
Output Short Circuit Current(2) ........................ 100 mA
DC OPERATING CHARACTERISTICS
VCC = 2.7V to 5.5V and over the recommended temperature conditions unless otherwise specified.
Symbol
Parameter
Test Conditions
Min
ILI
Input Leakage Current
VIN = GND to Vcc
ILO
Output Leakage Current
VIN = GND to Vcc
ICC1
Power Supply Current (Write)
ICC2
Max
Units
-2
10
µA
-10
10
µA
fSCL = 400 kHz
VCC = 5.5V
3
mA
Power Supply Current (Read)
fSCL = 400 kHz
VCC = 5.5 V
1
mA
ISB
Standby Current
Vcc = 5.5 V,
VIN = GND or Vcc
60
µA
VIL(1)
Input Low Voltage
-0.5
0.3 x Vcc
V
VIH(1)
Input High Voltage
0.7 x Vcc
Vcc + 0.5
V
VOL
Output Low Voltage
(SDA, RESET)
IOL = 3 mA
VCC = 2.7 V
0.4
V
VOH
Output High Voltage
(RESET)
IOH = -0.4 mA
VCC = 2.7 V
Vcc 0.75
CAT102x-45
(VCC = 5.0 V)
4.50
4.75
CAT102x-42
(VCC = 5.0 V)
4.25
4.50
CAT102x-30
(VCC = 3.3 V)
3.00
3.15
CAT102x-28
(VCC = 3.3 V)
2.85
3.00
CAT102x-25
(VCC = 3.0 V)
2.55
2.70
Reset Threshold
VTH
Typ
V
V
VRVALID
Reset Output Valid VCC Voltage
1.00
V
VRT(2)
Reset Threshold Hysteresis
15
mV
Notes:
1. VIL min and VIH max are reference values only and are not tested.
2. This parameter is tested initially and after a design or process change that affects the parameter. Not 100% tested.
Doc. No. 3009, Rev. G
4
Preliminary Information
CAT1021, CAT1022, CAT1023
CAPACITANCE
TA = 25°C, f = 1.0 MHz, VCC = 5V
Symbol
COUT
(1)
CIN(1)
Test
Test Conditions
Max
Units
VOUT = 0V
8
pF
VIN = 0V
6
pF
Output Capacitance
Input Capacitance
AC CHARACTERISTICS
VCC = 2.7 V to 5.5 V and over the recommended temperature conditions, unless otherwise specified.
Memory Read & Write Cycle(2)
Symbol
Parameter
fSCL
Min
Max
Units
Clock Frequency
400
kHz
tSP
Input Filter Spike
Suppression (SDA, SCL)
100
ns
tLOW
Clock Low Period
1.3
µs
tHIGH
Clock High Period
0.6
µs
tR(1)
SDA and SCL Rise Time
300
ns
tF(1)
SDA and SCL Fall Time
300
ns
tHD;STA
Start Condition Hold Time
0.6
µs
tSU;STA
Start Condition Setup Time
(for a Repeated Start)
0.6
µs
tHD;DAT
Data Input Hold Time
0
ns
tSU;DAT
Data Input Setup Time
100
ns
tSU;STO
Stop Condition Setup Time
0.6
µs
tAA
SCL Low to Data Out Valid
tDH
Data Out Hold Time
50
ns
tBUF(1)
Time the Bus must be Free Before a
New Transmission Can Start
1.3
µs
tWC(3)
Write Cycle Time (Byte or Page)
900
5
ns
ms
Notes:
1. This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
2. Test Conditions according to “AC Test Conditions” table.
3. 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.
5
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
RESET CIRCUIT AC CHARACTERISTICS
Symbol
Parameter
Test
Conditions
Min
Typ
Max
Units
tPURST
Reset Timeout
Note 2
130
200
270
ms
tRPD
VTH to RESET Output Delay
Note 3
5
µs
tGLITCH
VCC Glitch Reject Pulse Width
Note 4, 5
30
ns
MR Glitch
Manual Reset Glitch Immunity
Note 1
100
ns
tMRW
MR Pulse Width
Note 1
tMRD
MR Input to RESET Output Delay
Note 1
tWD
Watchdog Timeout
Note 1
1.0
Test
Conditions
Min
5
µs
1
µs
1.6
2.3
sec
Typ
Max
Units
POWER-UP TIMING5,6
Symbol
Parameter
tPUR
Power-Up to Read Operation
270
ms
tPUW
Power-Up to Write Operation
270
ms
AC TEST CONDITIONS
Parameter
Test Conditions
Input Pulse Voltages
0.2 VCC to 0.8 VCC
Input Rise and Fall times
10 ns
Input Reference Voltages
0.3 VCC , 0.7 VCC
Output Reference Voltages
0.5 VCC
Output Load
Current Source: IOL = 3 mA;
CL = 100 pF
RELIABILITY CHARACTERISTICS
Symbol
Parameter
Reference Test Method
Min
Max
Units
NEND(5)
Endurance
MIL-STD-883, Test Method 1033 1,000,000
TDR(5)
Data Retention
MIL-STD-883, Test Method 1008
100
Years
VZAP(5)
ESD Susceptibility
MIL-STD-883, Test Method 3015
2000
Volts
ILTH(5)(7)
Latch-Up
JEDEC Standard 17
100
mA
Cycles/Byte
Notes:
1. Test Conditions according to “AC Test Conditions” table.
2. Power-up, Input Reference Voltage VCC = VTH, Reset Output Reference Voltage and Load according to “AC Test Conditions” Table
3. Power-Down, Input Reference Voltage VCC = VTH, Reset Output Reference Voltage and Load according to “AC Test Conditions” Table
4. VCC Glitch Reference Voltage = VTHmin; Based on characterization data
5. This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
6. tPUR and tPUW are the delays required from the time VCC is stable until the specified memory operation can be initiated.
7. Latch-up protection is provided for stresses up to 100 mA on input and output pins from -1 V to VCC + 1 V.
Doc. No. 3009, Rev. G
6
Preliminary Information
CAT1021, CAT1022, CAT1023
DEVICE OPERATION
Reset Controller Description
The CAT1021/22/23 precision RESET controllers ensure
correct system operation during brownout and power
up/down conditions. They are configured with open
drain RESET outputs.
embedded EEPROM is disabled for all operations,
including write operations. If the Reset output(s) are
active, in progress communications to the EEPROM are
aborted and no new communications are allowed. In this
condition an internal write cycle to the memory can not be
started, but an in progress internal non-volatile memory
write cycle can not be aborted. An internal write cycle
initiated before the Reset condition can be successfully
finished if there is enough time (5ms) before VCC reaches
the minimum value of 2V.
During power-up, the RESET outputs remain active
until VCC reaches the VTH threshold and will continue
driving the outputs for approximately 200ms (tPURST)
after reaching VTH. After the tPURST timeout interval, the
device will cease to drive the reset outputs. At this point
the reset outputs will be pulled up or down by their
respective pull up/down resistors.
In addition, the CAT1021 includes a Write Protection Input
which when tied to VCC will disable any write operations
to the device.
During power-down, the RESET outputs will be active
when VCC falls below VTH. The RESET output will be
valid so long as VCC is >1.0V (VRVALID). The device is
designed to ignore the fast negative going VCC transient
pulses (glitches).
Watchdog Timer
The Watchdog Timer provides an independent protection
for microcontrollers. During a system failure, CAT1021/
22/23 devices will provide a reset signal after a time-out
interval of 1.6 seconds for a lack of activity. The CAT1023
is designed with the Watchdog timer feature on the WDI
pin. The CAT1021 and CAT1022 monitor the SDA line. If
WDI or SDA does not toggle within a 1.6 second interval,
the reset condition will be generated on the reset outputs.
The watchdog timer is cleared by any transition on a
monitored line.
Reset output timing is shown in Figure 1.
Manual Reset Operation
The RESET pin can operate as reset output and manual
reset input. The input is edge triggered; that is, the
RESET input will initiate a reset timeout after detecting
a high to low transition.
When RESET I/O is driven to the active state, the 200
msec timer will begin to time the reset interval. If external
reset is shorter than 200 ms, Reset outputs will remain
active at least 200 ms.
As long as reset signal is asserted, the watchdog timer
will not count and will stay cleared.
The CAT1021/22/23 also have a separate manual reset
input. Driving the MR input low by connecting a
pushbutton (normally open) from MR pin to GND will
generate a reset condition. The input has an internal pull
up resistor.
Reset remains asserted while MR is low and for the
Reset Timeout period after MR input has gone high.
Glitches shorter than 100 ns on MR input will not
generate a reset pulse. No external debouncing circuits
are required. Manual reset operation using MR input is
shown in Figure 2.
Hardware Data Protection
The CAT1021/22/23 supervisors have been designed
to solve many of the data corruption issues that have
long been associated with serial EEPROMs. Data
corruption occurs when incorrect data is stored in a
memory location which is assumed to hold correct data.
Whenever the device is in a Reset condition, the
7
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
t
Figure 1. RESET Output Timing
GLITCH
VTH
VRVALID
t PURST
VCC
t RPD
t PURST
RESET
RESET
Figure 2. MR Operation and Timing
t MRW
MR
t MRD
t PURST
RESET
RESET
Doc. No. 3009, Rev. G
8
t RPD
Preliminary Information
CAT1021, CAT1022, CAT1023
SDA when SCL is HIGH. The CAT1021/22/23 monitor
the SDA and SCL lines and will not respond until this
condition is met.
EMBEDDED EEPROM OPERATION
The CAT1021/22/23 feature a 2kbit embedded serial
EEPROM that 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. The
transfer is controlled by the Master device which
generates the serial clock and all START and STOP
conditions for bus access. Both the Master device and
Slave device can operate as either transmitter or receiver,
but the Master device controls which mode is activated.
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.
DEVICE ADDRESSING
The 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 programmable in metal
and the default is 1010.
I2C Bus Protocol
The features of the I2C bus protocol are defined as
follows:
(1) Data transfer may be initiated only when the bus is
not busy.
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.
(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.
After the Master sends a START condition and the slave
address byte, the CAT1021/22/23 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT1021/22/23 then perform a Read or Write operation
depending on the R/W bit.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
Figure 3. Bus Timing
tF
tHIGH
tLOW
tR
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tSU:DAT
tSU:STO
SDA IN
tAA
tBUF
tDH
SDA OUT
Figure 4. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
tWR
STOP
CONDITION
9
START
CONDITION
ADDRESS
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
ACKNOWLEDGE
WRITE OPERATIONS
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.
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 a 8-bit
address that is to be written into the address pointers of
the device. After receiving another acknowledge from the
Slave, the Master device transmits the data to be written
into the addressed memory location. The device
acknowledges once more and the Master generates the
STOP condition. At this time, the device begins an
internal programming cycle to non-volatile memory. While
the cycle is in progress, the device will not respond to any
request from the Master device.
All devices respond 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 8bit byte.
When a device 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
device will continue to transmit data. If no acknowledge
is sent by the Master, the device terminates data
transmission and waits for a STOP condition.
Figure 5. Start/Stop Timing
SDA
SCL
START BIT
STOP BIT
Figure 6. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
Figure 7. Slave Address Bits
Default Configuration
CAT
Doc. No. 3009, Rev. G
1
0
1
0
0
0
10
0
R/W
Preliminary Information
CAT1021, CAT1022, CAT1023
Page Write
The CAT1021/22/23 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 byte is transmitted, the Master is allowed
to send up to 15 additional bytes. After each byte has
been transmitted, the CAT1021/22/23 will respond with
an acknowledge and internally increment the lower order
address bits by one. The high order bits remain
unchanged.
If the Master transmits more than 16 bytes before sending
the STOP condition, the address counter ‘wraps around,’
and previously transmitted data will be overwritten.
When 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 CAT1021/22/23 in a single write cycle.
Figure 8. Byte Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
BYTE
ADDRESS
S
T
O
P
DATA
P
S
A
C
K
A
C
K
A
C
K
Figure 9. Page Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SLAVE
ADDRESS
BYTE
ADDRESS (n)
DATA n
S
T
DATA n+15 O
P
DATA n+1
S
P
A
C
K
A
C
K
A
C
K
11
A
C
K
A
C
K
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
Acknowledge Polling
memory array is protected and becomes read only. The
CAT1021 will accept both slave and byte addresses,
but the memory location accessed is protected from
programming by the device’s failure to send an
acknowledge after the first byte of data is received.
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 opration, the
CAT1021/22/23 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 device is still busy with the write
operation, no ACK will be returned. If a write operation
has completed, an ACK will be returned and the host can
then proceed with the next read or write operation.
Read Operations
The READ operation for the CAT1021/22/23 is initiated
in the same manner as the write operation with one
exception, the R/W bit is set to one. Three different
READ operations are possible: Immediate/Current
Address READ, Selective/Random READ and
Sequential READ.
WRITE PROTECTION PIN (WP)
The Write Protection feature (CAT1021 only) allows the
user to protect against inadvertent memory array
programming. If the WP pin is tied to VCC, the entire
Figure 10. 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
DATA
N
O
A
C
K
SCL
SDA
8
9
8TH BIT
DATA OUT
Doc. No. 3009, Rev. G
NO ACK
12
STOP
Preliminary Information
CAT1021, CAT1022, CAT1023
Immediate/Current Address Read
Sequential Read
The CAT1021/22/23 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. For N = E = 255, the
counter will wrap around to zero and continue to clock
out valid data. After the CAT1021/22/23 receives its
slave address information (with the R/W bit set to one),
it issues an acknowledge, then transmits the 8-bit byte
requested. The master device does not send an
acknowledge, but will generate a STOP condition.
The Sequential READ operation can be initiated by
either the Immediate Address READ or Selective READ
operations. After the CAT1021/22/23 sends the inital 8bit byte requested, the Master will responds with an
acknowledge which tells the device it requires more
data. The CAT1021/22/23 will continue to output an 8-bit
byte for each acknowledge, thus sending the STOP
condition.
The data being transmitted from the CAT1021/22/23 is
sent sequentially with the data from address N followed
by data from address N + 1. The READ operation
address counter increments all of the CAT1021/22/23
address bits so that the entire memory array can be read
during one operation.
Selective/Random Read
Selective/Random 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 addresses of the location it
wishes to read. After the CAT1021/22/23 acknowledges,
the Master device sends the START condition and the
slave address again, this time with the R/W bit set to one.
The CAT1021/22/23 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.
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
T
O
P
SLAVE
ADDRESS
S
S
A
C
K
P
A
C
K
A
C
K
DATA n
N
O
A
C
K
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
13
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
PACKAGE OUTLINES
TDFN 3X4.9 PACKAGE (RD2)
A
5
8
5
B
4.90 + 0.10
(5)
3.00 + 0.15
8
0.10
0.15
0.20
0.25
2.00 + 0.15
0.60 + 0.10 (8X)
PIN 1 ID
2x
d 0.15 c
1
PIN 1 INDEX AREA
3.00 + 0.10
(S)
4
4
2x
d 0.15 c
0.30 + 0.05 (8X)
8x
j 0.10m C A B
1
0.65 TYP. (6x)
1.95 REF. (2x)
0.75 + 0.05
f 0.10 c
0.20 REF.
8x
d 0.08 c
C
NOTE:
1. ALL DIMENSION ARE IN mm. ANGLES IN DEGREES.
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
COPLANARITY SHALL NOT EXCEED 0.08mm.
3. WARPAGE SHALL NOT EXCEED 0.10mm.
4. PACKAGE LENGTH / PACKAGE WIDTH ARE CONSIDERED AS SPECIAL
CHARACTERISTIC(S).
5. REFER TO JEDEC MO-229, FOOTPRINTS ARE COMPATIBLE TO 8 MSOP.
0.0-0.05
Doc. No. 3009, Rev. G
14
Preliminary Information
CAT1021, CAT1022, CAT1023
TDFN 3X3 PACKAGE (RD4)
5
0.75 + 0.05
A
B
3.00 + 0.10
(S)
8
2X
0.15 C
1
4
3.00 + 0.10
(S)
2X
0.0 - 0.05
0.15 C
PIN 1 INDEX AREA
5
8
1.50 + 0.10
0.75 + 0.05
C
2.30 + 0.10
C0.35
0.25 min.
PIN 1 ID
1
0.30 + 0.07 (8x)
0.30 + 0.10 (8x)
0.65 TYP. (6x)
1.95 REF. (2x)
NOTE:
1. ALL DIMENSION ARE IN mm. ANGLES IN DEGREES.
2. COPLANARITY SHALL NOT EXCEED 0.08 mm.
3. WARPAGE SHALL NOT EXCEED 0.10 mm.
4. PACKAGE LENGTH / PACKAGE WIDTH ARE CONSIDERED AS SPECIAL CHARACTERISTIC(S)
5. REFER JEDEC MO-229 / WEEC
15
Doc No. 3009, Rev. G
CAT1021, CAT1022, CAT1023
Preliminary Information
Ordering Information
Prefix
Device #
Suffix
1021
CAT
Optional
Company ID
Product
Number
1021: 2K
1022: 2K
1023: 2K
S
I
Temperature Range
I = Industrial (-40˚C to 85˚C)
E = Extended (-40˚C to +125˚C)
Package
P: PDIP
S: SOIC
R: MSOP
U: TSSOP
RD2: 8-pad TDFN
(3x4.9mm, MSOP Footprint)
RD4: 8-pad TDFN (3x3mm)
L: PDIP (Lead free, Halogen free)
V: SOIC (Lead free, Halogen free)
Y: TSSOP (Lead free, Halogen free)
Z: MSOP (Lead free, Halogen free)
ZD2: TDFN 3x4.9mm (Lead free, Halogen free)
ZD4: TDFN 3x3mm (Lead free, Halogen free)
-30
TE13
Tape & Reel
TE13: 2000/Reel
Reset Threshold
Voltage
45: 4.5-4.75V
42: 4.25-4.5V
30: 3.0-3.15V
28: 2.85-3.0V
25: 2.55-2.7V
Note:
(1) The device used in the above example is a CAT1021SI-30TE13 (Supervisory circuit with I2C serial 2k CMOS EEPROM, SOIC, Industrial
Temperature, 3.0-3.15V Reset Threshold Voltage, Tape and Reel).
REVISION HISTORY
Date
Rev.
Reason
9/25/2003
F
Added Green Package logo
Updated DC Operating Characteristic notes
Updated Reliability Characteristics notes
11/7/2003
G
Eliminated Automotive temperature range
Updated Ordering Information with “Green” package
codes
Updated Reset Circuit AC Characteristics
Doc. No. 3009, Rev. G
16
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Publication #:
Revison:
Issue date:
Type:
3009
G
11/10/03
Preliminary