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PC87591E Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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PC87591E Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 437 page  www.national.com 4 Revision 1.07 Features (Continued) ❏ 15 IRQ routing options ■ Legacy free support ■ Real-Time Clock (RTC) — DS1287 and MC146818 compatible — 242-byte battery backed-up CMOS RAM — Calendar including century and automatic leap-year adjustment (Y2K compliant) — Optional adjustment for daylight saving time — BCD or binary format for timekeeping — Three individually maskable interrupt event flags: periodic rates from 122 µs to 500 ms; time-of-day alarm, once-per-second to once-per-day — Double-buffer time registers — Alarm wake-up ■ Mobile System Wake-Up Control (MSWC) — Wake-up on detection of RI1, RI2, RING activity ❏ External modem ring on serial port ❏ Ring pulse or pulse train on RING input signal ❏ Software-controlled off events — Optional routing of power-up request on IRQ and/or SMI lines Clocking, Supply and Package Information ■ Strap Input Controlled Operating Modes — Turn on shared BIOS — TRI-STATE — Development — On-board development — Programing environment ■ Clocks — Single 32.768 KHz crystal oscillator — LPC clock, up to 33 MHz — On-chip high frequency clock generator ❏ CPU clock 4-20 MHz ❏ Software-controlled frequency generation ❏ Multiplier source 32 KHz input — 32 KHz clock out — CR16B clock out ■ Power Supply — 3.3V supply operation — 5V tolerance and back-drive protection on all pins (except LPC bus pins and keyboard scan inputs) — Separate supply for Host I/F (VDD) and Embedded Controller functions (VCC) — Backup battery input for RTC, and wake-up configu- ration. — Reduced power consumption capability — Four power modes, switched by software or hard- ware ❏ Active mode current (TBD mA) ❏ Active mode executing WAIT ❏ Idle (15 µA) ❏ Power off for RTC only (0.9 µA typical) from backup battery — Automatic wake-up on system events ■ Package Options — 128-pin LQFP package — 176-pin LQFP package for more GPIO pins, Expan- sion Memory use and development systems |
Similar Part No. - PC87591E |
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Similar Description - PC87591E |
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