Document
CAT1163
Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer (16K)
Description
The CAT1163 is a complete memory and supervisory solution for microcontroller−based systems. A serial EEPROM memory (16K) with hardware memory write protection, a system power supervisor with brown out protection and a watchdog timer are integrated together in low power CMOS technology. Memory interface is via an I2C bus.
The 1.6−second watchdog circuit returns a system to a known good state if a software or hardware glitch halts or “hangs” the system. The CAT1163 watchdog monitors the WDI input pin.
The power supply monitor and reset circuit protects memory and system controllers during power up/down and against brownout conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V 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, a reset pin can be used as a debounced input for pushbutton manual reset capability.
The CAT1163 memory features a 16−byte page. In addition, hardware data protection is provided by a write protect pin WP and 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 a surface mount, 8−pin SO package.
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PDIP−8 CASE 646AA
SOIC−8 CASE 751BD
PIN CONFIGURATION
PDIP 8 Lead SOIC 8 Lead
WDI RESET
WP GND
1
8
2
7
CAT1163
3
6
4
5
VCC RESET SCL SDA
Pin Name WDI
RESET WP GND SDA
PIN FUNCTIONS
Function Watchdog Timer Input Active Low Reset I/O Write Protect Ground Serial Data/Address
Features
• Watchdog Timer Input (WDI) • 400 kHz I2C Bus Compatible • 2.7 V to 6.0 V Operation • Low Power CMOS Technology • 16−Byte Page Write Buffer • Built−in Inadvertent Write Protection
♦ VCC Lock Out ♦ Write Protection Pin, WP
• Active High or Low Reset
♦ Precision Power Supply Voltage Monitor
♦ 5 V, 3.3 V and 3 V Systems
♦ Five Threshold Voltage Options
• 1,000,000 Program/Erase Cycles • Manual Reset
SCL RESET
VCC
Clock Input Active High Reset I/O Power Supply
ORDERING INFORMATION For Ordering Information details, see page 10.
• 100 Year Data Retention • 8−Pin DIP or 8−Pin SOIC • Commercial and Industrial Temperature Ranges • These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
© Semiconductor Components Industries, LLC, 2011
1
November, 2011 − Rev. 10
Publication Order Number: CAT1163/D
CAT1163
Table 1. RESET THRESHOLD OPTION
Part Dash Number
Minimum Threshold
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
EXTERNAL LOAD
V CC GND
BLOCK DIAGRAM
D OUT ACK
WORD ADDRESS BUFFERS
SENSEAMPS SHIFT REGISTERS
COLUMN DECODERS
SDA WP
STA RT/ STOP LOGIC
CONTROL LOGIC
XDEC
16K EEPROM
DATA IN STORAGE
HIGH VOLTAGE/ TIMING CONTROL
RESET Controller
STATE COUNTERS
SCL
Precision WAT CH DO G
Vcc Monitor
SLAVE ADDRESS
COMPARATORS
WDI RESET RESET
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CAT1163
SPECIFICATIONS
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
Temperature Under Bias
–55 to +125
°C
Storage Temperature
–65 to +150
°C
Voltage on any Pin with Respect to Ground (Note 1) VCC with Respect to Ground Package Power Dissipation Capability (TA = 25°C) Lead Soldering Temperature (10 seconds)
−2.0 to VCC + 2.0
V
−2.0 to 7.0
V
1.0
W
300
°C
Output Short Circuit Current (Note 2)
100
mA
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. The minimum DC input voltage is –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum
DC voltage on output pins is VCC +0.5 V, which may overshoot to VCC +2.0 V 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.
Table 3. RELIABILITY CHARACTERISTICS
Symbol
Parameter
Reference Test Method
Min
Max
NEND (Note 3) Endurance
MIL−STD−883, Test Method 1033
1,000,000
TDR (Note 3) Data Retention
MIL−STD−883, Test Method 1008
100
VZAP (Note 3) ESD Susceptibility
MIL−STD−883, Test Method 3015
2000
ILTH (Notes 3 & 4) Latch−Up
JEDEC Standard 17
100
3. This parameter is tested initially and after a design or process change that affects the parameter. 4. Latch−up protection is provided for s.