CAT1021 Datasheet PDF - Catalyst Semiconductor

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CAT1021
Catalyst Semiconductor

Part Number CAT1021
Description (CAT1021 - CAT1023) Supervisory Circuits
Page 21 Pages


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CAT1021, CAT1022, CAT1023
Supervisory Circuits with I2C Serial 2k-bit CMOS
EEPROM, Manual Reset and Watchdog Timer
FEATURES
DESCRIPTION
Precision Power Supply Voltage Monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
Watchdog Timer
Active High or Low Reset
The CAT1021, CAT1022 and CAT1023 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.
— Valid reset guaranteed at VCC = 1V
400kHz I2C Bus
2.7V to 5.5V Operation
Low power CMOS technology
The CAT1021 and CAT1023 provide a precision VCC
sense circuit and two open drain outputs: one (RESET)
drives high and the other (R¯¯E¯S¯E¯T¯) drives low whenever
VCC falls below the reset threshold voltage. The
CAT1022 has only a R¯¯E¯S¯E¯T¯ output and does not have
16-Byte Page Write Buffer
Built-in inadvertent write protection
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.
— WP pin (CAT1021)
1,000,000 Program/Erase cycles
Manual Reset Input
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
100 year data retention
CAT1021www.DataSheet4U.com and CAT1022, the watchdog timer monitors
the SDA signal. The CAT1023 has a separate watchdog
Industrial and extended temperature ranges
timer interrupt input pin, WDI.
8-pin DIP, SOIC, TSSOP, MSOP or TDFN
(3 x 3 mm foot-print) packages
— TDFN max height is 0.8mm
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 R¯¯E¯S¯E¯T¯ pin or a
separate input, ¯M¯R¯, can be used as an input for push-
For Ordering Information details, see page 19.
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.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 3009 Rev. L



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CAT1021, CAT1022, CAT1023
BLOCK DIAGRAM
EXTERNALLOAD
VCC
VSS
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSEAMPS
SHIFT REGISTERS
COLUMN
DECODERS
SDA
START/STOP
LOGIC
WP
(CAT1021)
CONTROL
LOGIC
XDEC
2kbit
EEPROM
THRESHOLD VOLTAGE OPTION
Part Dash
Number
-45
-42
-30
-28
-25
Minimum
Threshold
4.50
4.25
3.00
2.85
2.55
Maximum
Threshold
4.75
4.50
3.15
3.00
2.70
DATA IN STORAGE
HIGHVOLTAGE/
TIMING CONTROL
RESET Controller
STATE COUNTERS
SCL
Precision
SLAVE
MR
Vcc Monitor
ADDRESS
COMPARATORS
RESET
(CAT1021/23)
RESET
WDI
(CAT1023)
PIN CONFIGURATION
DIP Package (L)
SOIC Package (W)
TSSOP Package (Y)
MSOP Package (Z)
¯M¯R¯ 1
R¯¯E¯S¯E¯T¯ 2
WP 3
VSS 4
CAT1021
8 VCC
7 RESET
6 SCL
5 SDA
¯M¯R¯ 1
R¯¯E¯S¯E¯T¯ 2
NC 3
VSS 4
CAT1022
8 VCC
7 NC
6 SCL
5 SDA
¯M¯R¯ 1
R¯¯E¯S¯E¯T¯ 2
RESET 3
VSS 4
CAT1023
8 VCC
7 WDI
6 SCL
5 SDA
(Bottom View)
TDFN Package: 3mm x 3mm
0.8mm maximum height - (ZD4)
VCC 8
RESET 7
SCL 6
SDA 5
CAT1021
1 ¯M¯R¯
2 R¯¯E¯S¯E¯T¯
3 WP
4 VSS
VCC 8
NC 7
SCL 6
SDA 5
CAT1022
1 ¯M¯R¯
2 R¯¯E¯S¯E¯T¯
3 NC
4 VSS
VCC 8
WDI 7
SCL 6
SDA 5
CAT1023
1 ¯M¯R¯
2 R¯¯E¯S¯E¯T¯
3 RESET
4 VSS
Doc. No. 3009 Rev. L
2 © 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice



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CAT1021, CAT1022, CAT1023
PIN DESCRIPTION
RESET/R¯¯E¯S¯E¯T¯: RESET OUTPUT
(RESET CAT1021/23 Only)
These are open drain pins and R¯¯E¯S¯E¯T¯ 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
R¯¯E¯S¯E¯T¯ 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.
¯M¯R¯: 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.
PIN FUNCTION
Pin
Name
NC
R¯¯E¯S¯E¯T¯
VSS
SDA
SCL
RESET
VCC
WP
¯M¯R¯
WDI
Function
No Connect
Active Low Reset Input/Output
Ground
Serial Data/Address
Clock Input
Active High Reset Output (CAT1021/23)
Power Supply
Write Protect (CAT1021 only)
Manual Reset Input
Watchdog Timer Interrupt (CAT1023)
OPERATING TEMPERATURE RANGE
Industrial -40ºC to 85ºC
Extended -40ºC to 125ºC
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.
CAT102X FAMILY OVERVIEW
Device
CAT1021
Manual
Reset
Input Pin
Watchdog
Watchdog
Monitor
Pin
SDA
Write
Protection
Pin
Independent
Auxiliary
Voltage Sense
RESET:
Active High
and LOW
EEPROM
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.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. 3009 Rev. L



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CAT1021, CAT1022, CAT1023
ABSOLUTE MAXIMUM RATINGS(1)
Parameters
Temperature Under Bias
Storage Temperature
Voltage on any Pin with Respect to Ground(2)
VCC with Respect to Ground
Package Power Dissipation Capability (TA = 25°C)
Lead Soldering Temperature (10 secs)
Output Short Circuit Current(3)
Ratings
–55 to +125
–65 to +150
–2.0 to VCC + 2.0
–2.0 to 7.0
1.0
300
100
Units
ºC
ºC
V
V
W
ºC
mA
D.C. OPERATING CHARACTERISTICS
VCC = 2.7V to 5.5V and over the recommended temperature conditions unless otherwise specified.
Symbol
ILI
ILO
ICC1
Parameter
Input Leakage Current
Output Leakage Current
Power Supply Current (Write)
ICC2 Power Supply Current (Read)
ISB
VIL(4)
VIH(4)
VOL
VOH
Standby Current
Input Low Voltage
Input High Voltage
Output Low Voltage
(SDA, R¯¯E¯S¯E¯T¯)
Output High Voltage
(RESET)
VTH Reset Threshold
VRVALID
VRT(5)
Reset Output Valid VCC Voltage
Reset Threshold Hysteresis
Test Conditions
VIN = GND to Vcc
VIN = GND to Vcc
fSCL = 400kHz
VCC = 5.5V
fSCL = 400kHz
VCC = 5.5V
Vcc = 5.5V,
VIN = GND or Vcc
IOL = 3mA
VCC = 2.7V
IOH = -0.4mA
VCC = 2.7V
CAT102x-45
(VCC = 5.0V)
CAT102x-42
(VCC = 5.0V)
CAT102x-30
(VCC = 3.3V)
CAT102x-28
(VCC = 3.3V)
CAT102x-25
(VCC = 3.0V)
Min Typ Max
-2 10
-10 10
3
1
-0.5
0.7 x Vcc
60
0.3 x Vcc
Vcc + 0.5
0.4
Vcc - 0.75
4.50
4.75
4.25
4.50
3.00
3.15
2.85
3.00
2.55
1.00
15
2.70
Units
µA
µA
mA
mA
µA
V
V
V
V
V
V
mV
Notes:
(1) 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.
(2) 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.
(3) Output shorted for no more than one second. No more than one output shorted at a time.
(4) VIL min and VIH max are reference values only and are not tested.
(5) This parameter is tested initially and after a design or process change that affects the parameter. Not 100% tested.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
4
Doc. No. 3009 Rev. L



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