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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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BQ4822Y Folha de dados(PDF) 1 Page - Texas Instruments |
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BQ4822Y Folha de dados(HTML) 1 Page - Texas Instruments |
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1 / 16 page  Features ® Integrated SRAM, real-time clock, CPU supervisor, crystal, power-fail circuit, and battery ® Real-Time Clock counts hun- dredths of seconds through years in BCD format ® RAM-like clock access ® Compatible with industry- standard 8K x 8 SRAMs ® Unlimited write cycles ® 10-year minimum data retention and clock operation in the ab- sence of power ® Automatic power-fail chip dese- lect and write-protection ® Watchdog timer, power-on reset, alarm/periodic interrupt, power- fail and battery-low warning ® Automatic leap year adjustment ® Software clock calibration for greater than ±1 minute per month accuracy General Description The bq4822Y RTC Module is a non- volatile 65,536-bit SRAM organized as 8192 words by 8 bits with an in- tegral real-time clock and CPU su- pervisor. The CPU supervisor pro- vides a programmable watchdog timer and a microprocessor reset. Other features include an alarm, power-fail and periodic interrupt, and a battery low warning. The device combines an internal lithium battery, quartz crystal, clock and power-fail chip, and a full CMOS SRAM in a plastic 28-pin DIP module. The RTC Module di- rectly replaces industry-standard SRAMs and also fits into many EPROM and EEPROM sockets without any requirement for special write timing or limitations on the number of write cycles. Registers for the real-time clock, alarm and other special func- tions are located in registers 1FF0h–1FFFh of the memory array. The clock and alarm registers are dual-port read/write SRAM loca- tions that are updated once per sec- ond by a clock control circuit from the internal clock counters. The dual-port registers allow clock up- dates to occur without interrupting normal access to the rest of the SRAM array. The bq4822Y also contains a power- fail-detect circuit. The circuit dese- lects the device whenever VCC falls below tolerance, providing a high de- gree of data security. The battery is electrically isolated when shipped from the factory to provide maxi- mum battery capacity. The battery remains disconnected until the first application of VCC. 1 1 PN482201.eps 28-Pin DIP Module 2 3 4 5 6 7 8 28 27 26 25 24 23 22 21 9 10 20 19 11 12 18 17 13 14 16 15 VCC WE INT A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 RST A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS May 1997 Pin Connections bq4822Y RTC Module With 8Kx8 NVSRAM Pin Names A0–A12 Address input CE Chip enable RST Microprocessor reset WE Write enable OE Output enable DQ0–DQ7 Data in/data out INT Programmable interrupt VCC +5 volts VSS Ground |
Nº de peça semelhante - BQ4822Y |
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Descrição semelhante - BQ4822Y |
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