CAT1021YI-25-T3 datasheet, PDF

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CAT1021YI-25-T3: DescriptionSupervisory Circuit with I2C Serial 2K CMOS EEPROM. Manual Reset and Watchdog Timer Monitors SDA; Categorystorage storage; File Size188KB，21 Pages; ManufacturerCatalyst; Websitehttp://www.catalyst-semiconductor.com/

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CAT1021YI-25-T3 Overview

Supervisory Circuit with I2C Serial 2K CMOS EEPROM. Manual Reset and Watchdog Timer Monitors SDA

CAT1021YI-25-T3 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Catalyst
package instruction	TSSOP, TSSOP8,.25
Reach Compliance Code	unknow
Data retention time - minimum	100
Durability	1000000 Write/Erase Cycles
I2C control byte	1010000R
JESD-30 code	R-PDSO-G8
memory density	2048 bi
Memory IC Type	EEPROM
memory width	8
Number of terminals	8
word count	256 words
character code	256
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
organize	256X8
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Encapsulate equivalent code	TSSOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Parallel/Serial	SERIAL
power supply	3 V
Certification status	Not Qualified
Serial bus type	I2C
Maximum standby current	0.00006 A
Maximum slew rate	0.003 mA
Nominal supply voltage (Vsup)	3 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal form	GULL WING
Terminal pitch	0.635 mm
Terminal location	DUAL
write protect	HARDWARE

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CAT1021, CAT1022, CAT1023

Supervisory Circuits with I

C Serial 2k-bit CMOS

EEPROM, Manual Reset and Watchdog Timer

FEATURES

Precision Power Supply Voltage Monitor

— 5V, 3.3V and 3V systems

— Five threshold voltage options

Watchdog Timer

Active High or Low Reset

— Valid reset guaranteed at V

= 1V

400kHz I C Bus

2.7V to 5.5V Operation

Low power CMOS technology

16-Byte Page Write Buffer

Built-in inadvertent write protection

— WP pin (CAT1021)

1,000,000 Program/Erase cycles

Manual Reset Input

100 year data retention

Industrial and extended temperature ranges

8-pin DIP, SOIC, TSSOP, MSOP or TDFN

(3 x 3mm foot-print) packages

— TDFN max height is 0.8mm

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.

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, ¯¯¯, 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 V

sense circuit that prevents writes to memory

whenever V

falls below the reset threshold or until V

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 3 x 3mm.

DESCRIPTION

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 I

C bus.

The CAT1021 and CAT1023 provide a precision V

sense circuit and two open drain outputs: one (RESET)

¯¯¯¯¯¯

drives high and the other (RESET) drives low whenever

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.

For Ordering Information details, see page 19.

Characteristics subject to change without notice

Doc. No. MD-3009 Rev. M

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