Catalyst CAT1026WI-25TE13 Dual voltage supervisory circuits with i2c serial 2k-bit cmos eeprom Datasheet

H
CAT1026, CAT1027
Dual Voltage Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM
LE
FEATURES
■ Precision VCC power supply voltage monitor
■ 16-Byte page write buffer
— Five threshold voltage options
■ Built-in inadvertent write protection
— Externally adjustable down to 1.25 V
A D F R E ETM
■ Low power CMOS technology
— 5V, 3.3 V and 3 V systems
■ Additional voltage monitoring
EE
GEN FR
ALO
■ 1,000,000 Program/Erase cycles
■ Manual reset capability
■ Watchdog timer (CAT1027 only)
■ 100 year data retention
■ Active high or low reset
■ 8-pin DIP, SOIC, TSSOP, MSOP or TDFN
— Valid reset guaranteed to VCC = 1 V
2
■ 400 kHz I C bus
■ 3.0 V to 5.5 V operation
(3 x 3 mm foot-print) packages
— TDFN max height is 0.8mm
■ Industrial and extended temperature ranges
DESCRIPTION
The CAT1026 and CAT1027 are complete memory and
supervisory solutions for microcontroller-based 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 CAT1026 and CAT1027 provide a precision VCC
sense circuit with five reset threshold voltage options
that support 5V, 3.3V and 3V systems. The power
supply monitor and reset circuit protects memory and
systems controllers during power up/down and against
brownout conditions. If power supply voltages are out of
tolerance reset signals become active preventing the
system microcontroller, ASIC, or peripherals from
operating.
used as an input for push-button manual reset capability.
The CAT1026 and CAT1027 provide an auxiliary voltage
sensor input, VSENSE, which is used to monitor a second
system supply. The auxiliary high impedance comparator
drives the open drain output, VLOW, whenever the sense
voltage is below 1.25V threshold.
The CAT1027 is designed with 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. The CAT1027
features a watchdog timer interrupt input, WDI.
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
The CAT1026 features two open drain reset outputs: reset threshold during power up.
one (RESET) drives high and the other (RESET) drives Available packages include an 8-pin DIP, 8-pin SOIC, 8low whenever VCC falls below the threshold. Reset pin TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN
outputs become inactive typically 200 ms after the package thickness is 0.8mm maximum. TDFN footprint is
supply voltage exceeds the reset threshold value. With 3x3mm.
both active high and low reset signals, interface to
microcontrollers and other ICs is simple. CAT1027 has
only a RESET output. In addition, the RESET pin can be
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 3010, Rev. K
CAT1026, CAT1027
BLOCK DIAGRAM
EXTERNAL LOAD
SENSE AMPS
SHIFT REGISTERS
DOUT
ACK
RESET Threshold Options
Part Dash Minimum Maximum
Number Threshold Threshold
VCC
WORD ADDRESS
BUFFERS
VSS
COLUMN
DECODERS
START/STOP
LOGIC
SDA
2kbit
EEPROM
XDEC
CONTROL
LOGIC
DATA IN STORAGE
VCC Monitor
HIGH VOLTAGE/
TIMING CONTROL
VCC
STATE COUNTERS
+
RESET
Controller
-
WDI
(CAT1027)
VREF
Auxiliary Voltage Monitor
VSENSE
+
-
RESET
(CAT1026)
SCL
SLAVE
ADDRESS
COMPARATORS
RESET
VLOW
VREF
PIN CONFIGURATION
DIP Package (P, L)
SOIC Package (J, W)
TSSOP Package (U, Y)
MSOP Package (R, Z)
VLOW 1
RESET 2
CAT1026
8 VCC
7 RESET
(Bottom View)
TDFN Package: 3mm x 3mm
0.8mm maximum height - (RD4, ZD4)
VCC
8
1
VLOW
RESET
7
2
RESET
3
VSENSE
CAT1026
VSENSE 3
6 SCL
SCL
6
VSS 4
5 SDA
SDA
5
4
VSS
8 VCC
VCC
8
1
VLOW
7 WDI
WDI
7
2
RESET
VSENSE 3
6 SCL
SCL
6
3
VSENSE
VSS 4
5 SDA
SDA
5
4
VSS
VLOW 1
RESET 2
CAT1027
Doc. No. 3010, Rev. K
CAT1027
2
-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
CAT1026, CAT1027
PIN DESCRIPTION
RESET/RESET
RESET: RESET OUTPUTS
RESET
(RESET CAT1026 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.
VSENSE: AUXILIARY VOLTAGE MONITOR INPUT
The VSENSE input is a second voltage monitor which
is compared against CAT1026 and CAT1027 internal
reference voltage of 1.25V typically. Whenever the
input voltage is lower than 1.25V, the open drain
VLOW output will be driven low. An external resistor
divider is used to set the voltage level to be sensed.
Connect VSENSE to VCC if unused.
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.
VLOW: AUXILIARY VOLTAGE MONITOR OUTPUT
This open drain output goes low when VSENSE is less
than 1.25V and goes high when VSENSE exceeds the
reference voltage.
WDI (CAT1027 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.
SCL: SERIAL CLOCK
Serial clock input.
PIN FUNCTIONS
Pin Name
RESET
OPERATING TEMPERATURE RANGE
Function
Industrial
-40˚C to 85˚C
Active Low Reset Input/Output
Extended
-40˚C to 125˚C
VSS
Ground
SDA
Serial Data/Address
SCL
Clock Input
RESET
VCC
VSENSE
Active High Reset Output (CAT1026 only)
Power Supply
Auxiliary Voltage Monitor Input
VLOW
Auxiliary Voltage Monitor Output
WDI
Watchdog Timer Interrupt (CAT1027 only)
CAT10XX FAMILY OVERVIEW
Device
Manual
Reset
Input Pin
Watchdog
Watchdog
Monitor
Pin
Write
Protection
Pin
Independent
Auxiliary
Voltage Sense
RESET: Active
High and LOW
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. 3010, Rev. K
CAT1026, CAT1027
ABSOLUTE MAXIMUM RATINGS
Lead Soldering Temperature (10 seconds) ...... 300°C
Temperature Under Bias ................. –55°C to +125°C
Output Short Circuit Current(2) ........................ 100 mA
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.
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 +0.5 V, 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 ............ –2.0 V to + 7.0 V
Package Power Dissipation
Capability (TA = 25°C) .................................. 1.0 W
DC OPERATING CHARACTERISTICS
VCC = 3.0 V to 5.5 V 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
Power Supply Current
(Read)
ISB
Standby Current
VIL(1)
Input Low Voltage
-0.5
0.3 x Vcc
V
(1)
Input High Voltage
0.7 x Vcc
Vcc + 0.5
V
0.4
V
VIH
Typ
Max
Units
-2
10
µA
-10
10
µA
fSCL = 400 kHz
VCC = 5.5 V
3
mA
fSCL = 400 kHz
VCC = 5.5 V
1
mA
CAT1026
50
VIN = GND or Vcc CAT1027
60
Vcc = 5.5V
VOL
Output Low Voltage
(SDA, RESET , VLOW)
IOL = 3 mA
VCC = 2.7 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
(VCC Monitor)
VTH
µA
V
V
VRVALID
Reset Output Valid VCC
Voltage
1.00
V
VRT(2)
Reset Threshold Hysteresis
15
mV
VREF
Auxiliary Voltage Monitor
Threshold
1.2
1.25
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. 3010, Rev. K
4
1.3
V
CAT1026, CAT1027
CAPACITANCE
TA = 25°C, f = 1.0 MHz, VCC = 5V
Symbol
COUT
(1)
CIN(1)
Test
Test Conditions
Max
Units
VOUT = 0 V
8
pF
VIN = 0 V
6
pF
Output Capacitance
Input Capacitance
AC CHARACTERISTICS
VCC = 3.0 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. 3010, Rev. K
CAT1026, CAT1027
VOLTAGE MONITOR AND RESET CIRCUIT AC CHARACTERISTICS
Symbol
Parameter
Test
Conditions
Min
Typ
Max
Units
tPURST
Reset Timeout
Note 2
130
200
270
ms
tRPD1
VTH to RESET Output Delay
Note 3
5
µs
tGLITCH
VCC Glitch Reject Pulse Width
Note 4, 6
30
ns
tWD
Watchdog Timeout
Note 1
2.1
sec
tRPD2
VSENSE to VLOW Delay
Note 5
5
µs
Max
Units
1.0
1.6
POWER-UP TIMING6,7
Test
Conditions
Symbol
Parameter
Min
Typ
tPUR
Power-Up to Read Operation
270
ms
tPUW
Power-Up to Write Operation
270
ms
AC TEST CONDITIONS
Parameter
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
NEND
(6)
Parameter
Reference Test Method
Min
Max
Units
Endurance
MIL-STD-883, Test Method 1033 1,000,000
Cycles/Byte
TDR(6)
Data Retention
MIL-STD-883, Test Method 1008
100
Years
VZAP(6)
ESD Susceptibility
MIL-STD-883, Test Method 3015
2000
Volts
ILTH(6)(8)
Latch-Up
JEDEC Standard 17
100
mA
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. 0 < VSENSE ≤ VCC, VLOW Output Reference Voltage and Load according to “AC Test Conditions” Table.
6. This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
7. tPUR and tPUW are the delays required from the time VCC is stable until the specified memory operation can be initiated.
8. Latch-up protection is provided for stresses up to 100mA on input and output pins from -1 V to VCC + 1 V.
Doc. No. 3010, Rev. K
6
CAT1026, CAT1027
DEVICE OPERATION
Reset Controller Description
The CAT1026 and CAT1027 precision RESET
controllers ensure correct system operation during
brownout and power up/down conditions. They are
configured with open drain RESET outputs.
Data Protection
The CAT1026 and CAT1027 devices 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.
During power-up, the RESET outputs remain active
until VCC reaches the VTH threshold and will continue
driving the outputs for approximately 200 ms (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.
Whenever the device is in a Reset condition, the 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 2 V.
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 >1.0 V (VRVALID). The device is
designed to ignore the fast negative going VCC transient
pulses (glitches).
Reset output timing is shown in Figure 1.
In addition, to avoid data corruption due to the loss of
power supply voltage during the memory internal write
operation, the system controller should monitor the
unregulated DC power. Using the second voltage sensor,
VSENSE, to monitor an unregulated power supply, the
CAT1026 and CAT1027 signals an impending power
failure by setting VLOW low.
Manual Reset Capability
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.
Watchdog Timer
The Watchdog Timer provides an independent protection
for microcontrollers. During a system failure, the CAT1027
device will provide a reset signal after a time-out interval
of 1.6 seconds for a lack of activity. CAT1027 is designed
with the Watchdog timer feature on the WDI pin. If WDI
does not toggle within 1.6 second intervals, the reset
condition will be generated on reset output. The watchdog
timer is cleared by any transition on monitored line.
Monitoring Two Voltages
The CAT1026 and CAT1027 feature a second voltage
sensor, VSENSE, which drives the open drain VLOW
output low whenever the input voltage is below 1.25 V.
The auxiliary voltage monitor timing is shown in Figure
2.
As long as reset signal is asserted, the watchdog timer
will not count and will stay cleared.
By using an external resistor divider the sense circuitry
can be set to monitor a second supply in the system.
The circuit shown in Figure 3 provides an externally
adjustable threshold voltage, VTH_ADJ to monitor the
auxiliary voltage. The low leakage current at VSENSE
allows the use of large value resistors, to reduce the
system power consumption. The VLOW output can be
externally connected to the RESET output to generate
a reset condition when either of the supplies is invalid.
In other applications, VLOW signal can be used to
interrupt the system controller for an impending power
failure notification.
7
Doc No. 3010, Rev. K
CAT1026, CAT1027
t
Figure 1. RESET Output Timing
GLITCH
VTH
VRVALID
t PURST
VCC
t RPD1
t PURST
t RPD1
RESET
RESET
Figure 2. Auxiliary Voltage Monitor Timing
VREF
VSENSE
tRPD2
tRPD2
tRPD2
VLOW
Figure 3. Auxiliary Voltage Monitor
VCC
VAUX
CAT1026/27
Externally adjustable
threshold
R1
VTH-ADJ
VLOW
VSENSE
R2
VTH-ADJ = VREF ×
Doc. No. 3010, Rev. K
R + R2
R1 + R 2
= 1.25V × 1
R2
R2
8
Power Fail
Interrupt
tRPD2
CAT1026, CAT1027
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT1026 and CAT1027
monitor the SDA and SCL lines and will not respond until
this condition is met.
EMBEDDED EEPROM OPERATION
The CAT1026 and CAT1027 feature a 2kbit embedded
serial EEPROM that supports the I 2C 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 CAT1026 and CAT1027 monitor the
bus and responds with an acknowledge (on the SDA
line) when its address matches the transmitted slave
address. The CAT1026 and CAT1027 then perform a
Read or Write operation depending on the R/W bit.
START Condition
The START Condition precedes all commands to the
Figure 4. 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 5. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
tWR
STOP
CONDITION
9
START
CONDITION
ADDRESS
Doc No. 3010, Rev. K
CAT1026, CAT1027
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 CAT1026 and
CAT1027 acknowledge 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.
The CAT1026 and CAT1027 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 8-bit byte.
When the CAT1026 and CAT1027 begin 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 CAT1026 and CAT1027 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 6. Start/Stop Timing
SDA
SCL
START BIT
STOP BIT
Figure 7. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACKNOWLEDGE
Figure 8. Slave Address Bits
Default Configuration
CAT
Doc. No. 3010, Rev. K
1
0
1
0
0
0
10
0
R/W
CAT1026, CAT1027
Page Write
The CAT1026 and CAT1027 write up to 16 bytes of data
in a single write cycle, by 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 CAT1026 and CAT1027 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 CAT1026 and CAT1027 in a single write cycle.
Figure 9. 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 10. 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
11
A
C
K
A
C
K
A
C
K
Doc No. 3010, Rev. K
CAT1026, CAT1027
Acknowledge Polling
Read Operations
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
CAT1026 and CAT1027 initiate 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.
The READ operation for the CAT1026 and CAT1027 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.
Figure 11. 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. 3010, Rev. K
NO ACK
12
STOP
CAT1026, CAT1027
Immediate/Current Address Read
Sequential Read
The CAT1026 and CAT1027 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 CAT1026 and CAT1027
receive a slave address (with the R/W bit set t o one), an
acknowledge is issued, and the requested 8-bit byte is
transmitted. 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 CAT1026 and CAT1027 send the
inital 8-bit byte requested, the Master responds with an
acknowledge which tells the device it requires more
data. The CAT1026 and CAT1027 will continue to output
an 8-bit byte for each acknowledge, thus sending the
STOP condition.
The data being transmitted from the CAT1026 and
CAT1027 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 CAT1026
and CAT1027 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 CAT1026 and CAT1027
acknowledge, the Master device sends the START
condition and the slave address again, this time with the
R/W bit set to one. The CAT1026 and CAT1027 then
respond with an acknowledge and sends the 8-bit byte
requested. The master device does not send an
acknowledge but will generate a STOP condition.
Figure 12. 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
P
S
S
A
C
K
A
C
K
A
C
K
DATA n
N
O
A
C
K
Figure 13. 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. 3010, Rev. K
CAT1026, CAT1027
PACKAGE OUTLINES
8-LEAD 300 MIL WIDE PLASTIC DIP (P, L)
0.245 (6.17)
0.295 (7.49)
0.300 (7.62)
0.325 (8.26)
D
0.120 (3.05)
0.150 (3.81) 0.180 (4.57) MAX
0.015 (0.38)
—
0.110 (2.79)
0.150 (3.81)
0.100 (2.54)
BSC
0.310 (7.87)
0.380 (9.65)
0.045 (1.14)
0.060 (1.52)
0.014 (0.36)
0.022 (0.56)
Dimension D
Pkg
Min
Max
8L
0.355 (9.02)
0.400 (10.16)
Notes:
1. Complies with JEDEC Publication 95 MS001 dimensions; however, some of the dimensions may be more stringent.
2. All linear dimensions are in inches and parenthetically in millimeters.
Doc. No. 3010, Rev. K
14
CAT1026, CAT1027
8-LEAD 150 MIL WIDE SOIC (J, W)
0.1497 (3.80)
0.1574 (4.00)
0.2284 (5.80)
0.2440 (6.20)
D
0.0532 (1.35)
0.0688 (1.75)
0.050 (1.27) BSC
0.0040 (0.10)
0.0098 (0.25)
0.013 (0.33)
0.020 (0.51)
0.0099 (0.25)
X 45°
0.0196 (0.50)
0.0075 (0.19)
0.0098 (0.25)
0°–8°
0.016 (0.40)
0.050 (1.27)
Dimension D
Pkg
Min
Max
8L
0.1890(4.80)
0.1968(5.00)
Notes:
1. Complies with JEDEC publication 95 MS-012 dimensions; however, some dimensions may be more stringent.
2. All linear dimensions are in inches and parenthetically in millimeters.
3. Lead coplanarity is 0.004" (0.102mm) maximum.
15
Doc No. 3010, Rev. K
CAT1026, CAT1027
8-LEAD TSSOP (U, Y)
Doc. No. 3010, Rev. K
16
CAT1026, CAT1027
8 LEAD MSOP (R, Z)
0.38
0.28
0.0150
0.0110
0.1970
0.1890
5.00
4.80
S
0.0256 [0.65] BSC
0.1220
0.1142
3.10
2.90
0.0374
0.0295
0.0433 [1.10] MAX.
0.039 [0.10] MAX.
S
0.0059
0.0020
0.15
0.05
0.95
0.75
S
0.0150
0.0110
0.38
0.28
WITH PLATING
0.0276
0.0157
0.70
0.40
0.1220
0.1142
3.10
2.90
0.0091
0.0051
0.23
0.13
0.0050 [0.127]
0˚ - 6˚
WITH
PLATING
BASE METAL
0.0118 [0.30] REF.
SECTION A - A
Notes:
(1) All dimensions are in mm Angles in degrees.
2 Does not include Mold Flash, Protrusion or Gate Burrs. Mold Flash, Protrusions or Gate Burrs shall not exceed 0.15 mm. per side.
3 Does not include Interlead Flash orProtrusion. Interlead Flash or Protrusion shall not exceed 0.25 mm per side.
4 Does not include Dambar Protrusion, allowable Dambar Protrusion shall be 0.08 mm.
(5) This part is compliant with JEDEC Specification MO-187 Variations AA.
(6) Lead span/stand off height/coplanarity are considered as special characteristics. (S)
(7) Controlling dimensions in inches. [mm]
17
Doc No. 3010, Rev. K
CAT1026, CAT1027
TDFN 3X3 PACKAGE (RD4, ZD4)
5
0.75 + 0.05
A
B
3.00 + 0.10
(S)
8
2X
1
3.00 + 0.10
(S)
4
0.15 C
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)
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
Doc. No. 3010, Rev. K
18
0.30 + 0.10 (8x)
0.65 TYP. (6x)
CAT1026, CAT1027
Ordering Information
Prefix
CAT
Optional
Company ID
Device #
Suffix
1026
Product
Number
1026: 2K
1027: 2K
J
I
Temperature Range
I = Industrial (-40˚C to 85˚C)
E = Extended (-40˚C to +125˚C)
Package
P: PDIP
J: SOIC
R: MSOP
U: TSSOP
RD4: 8-pad TDFN (3x3mm)
L: PDIP (Lead free, Halogen free)
W: SOIC (Lead free, Halogen free)
Y: TSSOP (Lead free, Halogen free)
Z: MSOP (Lead free, Halogen free)
ZD4: TDFN 3x3mm (Lead free, Halogen free)
-30
TE13
Tape & Reel
SOIC: 2000/Reel
TSSOP: 2000/Reel
MSOP: 2500/Reel
TDFN: 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 CAT1026JI-30TE13 (Supervisory circuit with I2C serial 2k CMOS EEPROM, SOIC, Industrial
Temperature, 3.0-3.15V Reset Threshold Voltage, Tape and Reel).
19
Doc No. 3010, Rev. K
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
marking codes
4/12/2004
H
Eliminated data sheet designation
Updated Reel Ordering Information
11/1/2004
I
Changed SOIC package designators
Eliminated 8-pad TDFN (3x4.9mm) package
Added package outlines
11/04/04
J
Update Pin Configuration
11/11/04
M
Update Features
Update Description
Updae DC Operating Characteristic
Update AC Characteristics
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Revison:
Issue date:
3010
K
11/11/04
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