memory products - Al Kossow's Bitsavers

MK41H68/MK41 H69(N ,P)-20/25/35APPLICATIONThe MK41H6819 operates from a 5.0 volt supply. Itis compatible with all standard TTL families on allinputs and outputs. The device should share a solidground plane with any other devices interfaced withit, particularly TTL devices. Additionally, becausethe outputs can drive rail-ta-rail into high impedanceloads, the 41H6819 can also interface to 5 volt CMOSon all inputs and outputs. Refer to the normalizedperformance curves that follow.Since very high frequency current transients will beassociated with the operation of the MK41H68/9,power line inductance must be minimized on thecircuit board power distribution network. Power andground trace gridding or separate power planes canbe employed to reduce line inductance. Additionally,a high frequency decoupling capacitor shouldbe placed next to each RAM. The capacitor shouldbe 0.1 pF or larger.Though often times not thought of as such, thetraces on a memory board are basically unterminated,low impedance transmission lines. As suchthey are subject to signal reflections manifested asnoise, undershoots and excessive ringing. Seriestermination in close proximity to the TTL drivers canimprove driver/signal path impedance matching.While experimentation most often proves to be theonly practical approach to selection of series resistors,values in the range of 10 to 33 ohms oftenprove most suitable.ABSOWTE MAXIMUM RATINGS·Voltage on any pin relative to GND ....................................... -1.0 V to +7.0 VAmbient Operating Temperature (T A> ......................................... O°C to +70'CAmbient Storage Temperature (Plastic) .................................... -55°C to +125'CAmbient Storage Temperature (Ceramic) .................................. -65°C to +150'CTotal Device Power Dissipation .................................................... 1 WattOutput Current per Pin .......................................................... 50 mA'Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.This is a stress rating only and functional operation of the device at these or other conditions beyond those indicatedin the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extendedperiods of time may affect reliability.RECOMMENDED DC OPERATING CONDITIONS(O°C sT A s70°C)SYMPARAMETERMINTYPMAX UNITS NOTESVccSupply Voltage4.5 5.05.5 V 3GNDSupply Voltage0 00 VVIHLogic 1 Voltage, All Inputs2.2Vcc+1.0 V 3VILLogic 0 Voltage, All Inputs-0.30.8 V 3DC ELECTRICAL CHARACTERISTICS(O'CsT A s70°C) (Vcc = 5.0 V ± 10 percent)SYMPARAMETERMINMAX UNITS NOTESICClAverage Power Supply Current120 mA 4Icc2TTL Standby Current (MK41H68 only)8 mA 5ICC3CMOS Standby Current (MK41H68 only)50 pA 6IlLInput Leakage Current (Any Input Pin)-1+1 pA 7IOLOutput Leakage Current (Any Output Pin)-10+10 pA 8VOHOutput Logic 1 Voltage (lOUT = -4 mAl2.4V 3VOLOutput Logic 0 Voltage (lOUT = +8 mAl0.4 V 35110491