CAT1027: CPU Supervisor with 2 k EEPROM Memory

The CAT1027 is a complete memory and supervisory solution for microcontroller-based systems. A 2 k-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 400 kHz I²C bus.The CAT1027 provides a precision VCC sense circuit with five reset threshold voltage options that support 5.0 V, 3.3 V and 3.0 V 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.CAT1027 has only a RESET output. In addition, the RESET pin can be used as an input for push-button manual reset capability.The CAT1027 provides 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 1.25 V 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 2 k-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, 8-pin SOIC, 8-pin TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN package thickness is 0.8 mm maximum. TDFN footprint is 3x3 mm.

Features
  • Precision VCC power supply voltage supervisor 5.0 V, 3.3 V and 3.0 V systems Five threshold voltage options
  • Additional voltage monitoring — Externally adjustable down to 1.25 V
  • Watchdog timer
  • Active high or low reset — Valid reset guaranteed to VCC = 1 V
  • 400 kHz I²C bus
  • 3.0 V to 5.5 V operation
  • Low power CMOS technology
  • 16-Byte page write buffer
  • Built-in inadvertent write protection
  • 1,000,000 Program/Erase cycles
  • Manual reset capability
  • 100 year data retention
  • 8-pin DIP, SOIC, TSSOP, MSOP or TDFN (3 x 3 mm foot-print) packages — TDFN max height is 0.8mm
  • Industrial and extended temperature ranges
Applications
  • Industrial control
  • Medical systems
  • Printers
  • Mass storage
Package Drawings (5)
Document TitleDocument ID/SizeRevision
MSOP 8, 3x3846AD (56.5kB)revo
PDIP-8, 300 mils646AA (55.8kB)A
SOIC 8, 150 mils751BD (55.6kB)revo
TDFN8, 3x3511AL (55.4kB)A
TSSOP8, 4.4x3948AL (55.7kB)revo
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Dual Voltage Supervisory Circuits with I²C Serial 2k-bit CMOS EEPROMCAT1027/D (197.0kB)P
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
CAT1027LI-25-GLifetimePb-free Halide freePDIP-8646AANATube50$0.8866
CAT1027LI-28-GLifetimePb-free Halide freePDIP-8646AANATube50$0.8866
CAT1027LI-30-GLifetimePb-free Halide freePDIP-8646AANATube50$0.8866
CAT1027LI-42-GLifetimePb-free Halide freePDIP-8646AANATube50$0.8866
CAT1027LI-45-GLifetimePb-free Halide freePDIP-8646AANATube50$0.8866
CAT1027WI-25-GT3ActivePb-free Halide freeSOIC-8751BD1Tape and Reel3000$0.78
CAT1027WI-28-GActivePb-free Halide freeSOIC-8751BD1Tube100$0.8666
CAT1027WI-28-GT3ActivePb-free Halide freeSOIC-8751BD1Tape and Reel3000$0.78
CAT1027WI-30-GT3ActivePb-free Halide freeSOIC-8751BD1Tape and Reel3000$0.78
CAT1027WI-42-GT3ActivePb-free Halide freeSOIC-8751BD1Tape and Reel3000$0.78
CAT1027WI-45-GActivePb-free Halide freeSOIC-8751BD1Tube100$0.8666
CAT1027WI-45-GT3ActivePb-free Halide freeSOIC-8751BD1Tape and Reel3000$0.78
CAT1027YI-25-GT3ActivePb-free Halide freeTSSOP-8948AL1Tape and Reel3000$0.78
CAT1027YI-28-GT3ActivePb-free Halide freeTSSOP-8948AL1Tape and Reel3000$0.78
CAT1027YI-30-GT3ActivePb-free Halide freeTSSOP-8948AL1Tape and Reel3000$0.78
CAT1027YI-42-GT3ActivePb-free Halide freeTSSOP-8948AL1Tape and Reel3000$0.78
CAT1027YI-45-GT3ActivePb-free Halide freeTSSOP-8948AL1Tape and Reel3000$0.78
CAT1027ZD4I-25T3Consult Sales OfficePb-free Halide freeTDFN-8511AL1Tape and Reel3000
CAT1027ZD4I-28T3Consult Sales OfficePb-free Halide freeTDFN-8511AL1Tape and Reel3000
CAT1027ZD4I-30T3Consult Sales OfficePb-free Halide freeTDFN-8511AL1Tape and Reel3000
CAT1027ZD4I-42T3Consult Sales OfficePb-free Halide freeTDFN-8511AL1Tape and Reel3000
CAT1027ZD4I-45T3Consult Sales OfficePb-free Halide freeTDFN-8511AL1Tape and Reel3000
CAT1027ZI-25-GT3ActivePb-free Halide freeMSOP-8846AD1Tape and Reel3000$0.9066
CAT1027ZI-28-GT3ActivePb-free Halide freeMSOP-8846AD1Tape and Reel3000$0.9066
CAT1027ZI-30-GT3ActivePb-free Halide freeMSOP-8846AD1Tape and Reel3000$0.9066
CAT1027ZI-42-GT3ActivePb-free Halide freeMSOP-8846AD1Tape and Reel3000$0.9066
CAT1027ZI-45-GT3ActivePb-free Halide freeMSOP-8846AD1Tape and Reel3000$0.9066
Specifications
ProductTypeDensityOrganizationData Transmission Standardfcycle Max (kHz)tACC Max nsVCC Min (V)VCC Max (V)Istandby Max (µA)Iact Max (mA)T Min (°C)T Max (°C)
CAT1027WI-25-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027WI-28-GSerial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027WI-28-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027WI-30-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027WI-42-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027WI-45-GSerial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027WI-45-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027YI-25-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027YI-28-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027YI-30-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027YI-42-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027YI-45-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027ZI-25-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027ZI-28-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027ZI-30-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027ZI-42-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
CAT1027ZI-45-GT3Serial2 kb256 x 8I2C4009002.75.5603-4085
Dual Voltage Supervisory Circuits with I²C Serial 2k-bit CMOS EEPROM (197.0kB) CAT1027
PDIP-8, 300 mils CAT93C86B
SOIC 8, 150 mils CAV93C86
TSSOP8, 4.4x3 PCA9306
TDFN8, 3x3 CAT1027
MSOP 8, 3x3 CAT25010