PLX448

The PLX448 is a CMOS, UV erasable programmable logic device that can be easily programmed with industry standard hardware and software. With its on-board high current drivers and Schimitt triggers, metastable hardened registers  and input hystersis. PLX448 is ideally suitable for designs in which direct connection to a bus backplane or other noisy environment is required. The high current drivers meet most of the specifications of VME,VSB,MBI,MBII,Micro Channel , NuBus, and other leading bus signal specifications. In addition, the PLX448 has dynamic, bi-directional I/Os, buried register capability for building state machines and two clock inputs to handle asynchronous inputs. PLX448 has many distinctive features: The first one is eight high current programmable I/Os and 11 inputs with logic architecture similar to industry standard PLDs. The second one is intergrated 48 mA and 24 mA drivers programmable to open collector or three-state sonfigurations. The third one is burled register and combinatorial feedback capability. The forth one is metastable hardened registers. The fifth one is two independent clock inputs. The sixth one is on board drivers and Schimitt triggers allow sirect connection to noisy backplane. The seventh one is military temperature and reliability tested parts available in DIP and surface mountable packages. Otherwise, there are two applications. The first one is bus control logic: bus master and slave controllers; intelligent transceivers; interrupt generators and handlers;bus arbiters. The second one is general purpose high density, high dirve current logic.

There are some absolute maximum ratings of PLX448. Storage temperature is -65 to +150. Ambient temperauture with power applied us -55 to +125. Supply voltage to ground is -0.5 V to +7.0V. UV exposure is 7000 Wsec/cm2. DC programming voltage is 14.0V.Otherwise, there are some electrical characteristics.Output high voltage(Voh) is 2.4 V min when Vcc is the minimum value and Ioh is -3.0 MA while Vin is Vih or Vil. Output low voltage(Vol) is 0.6 V max when Vcc is the minimum value and Vin is Vih or Vil while Iol is 24MIL. Input high level(Vih) is 2.0 V min. Input low level(Vil) is 0.8 V max. Input leakage current(Iix) is -10 uA min and 10 uA max when Vin is between Vss and Vcc and Vcc is the maximum value. Output leakage current(Ioz) is -40 uA min and 40 uA max when Vcc is the maximum value and Vout is between Bs and vcc. Output short circuit current(Isc) is -30 mA min and -90 mA max when Vcc is the maximum value and Vout is 0.5V.

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