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PC87427 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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PC87427 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 46 page  www.national.com 4 Revision 1.0 Features (Continued) s Watchdog — Compliant with Watchdog Timer Hardware Require- ments for Microsoft Windows .NET Server, April 2002 — Autonomous system reset and programmable ad- dress line forcing on expiration of watchdog timer — Generates a 100 ms pulse at WDO pin Clocking, Supply and Package Information s Strap Input Controlled Operating Modes — Base Address (BADDR) for the PnP Index-Data register pair — Input clock presence (CKIN48) select — X-Bus configuration (XCNF2-0) select — SMBus slave address (SMBSA) select — High frequency clock selection (HFCKS) s Testability — XOR tree structure ❏ Includes all the device pins (except the supply pins, oscillator pins and CHASSIS pin) ❏ Selected at power-up by strap input (TEST) — TRI-STATE device pins, selected at power-up by strap input (TRIS) s Clocks — LPC clock input (up to 33 MHz) — ServerI/O modules clock: 48 MHz input or internal clock multiplier — 32.768 KHz crystal — On-chip low-frequency clock generator: ❏ 32.768 KHz for RTC, System Wake-Up Control (SWC), Power Active timers and the high-fre- quency clock generator ❏ Very low power consumption ❏ VBAT powered — On-chip high-frequency clock generator: ❏ Based on the 32.768 KHz clock ❏ VSB powered — Clock outputs: ❏ LFCKOUT - 32.768 KHz or 1 Hz ❏ HFCKOUT - configurable up to 48 MHz. The de- fault frequency 6, 10, 24 or 40 MHz, configurable by strap. s Protection — All pins are 5V tolerant and back-drive protected (except the LPC bus pins) — Separate battery pin that includes an internal UL protection resistor — GPIO multiplexing configuration lock s Power Supply — 3.3V supply operation — Separate pins for main (VDD) and standby (VSB) power supplies — Backup battery input for RTC, SWC and Power Active timers — Separate pin for core voltage filtering (VCORF) — Reduced standby power consumption — Very low power consumption for RTC and timers (0.9 µA typical) from backup battery s Package — 128-pin PQFP |
Similar Part No. - PC87427 |
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Similar Description - PC87427 |
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