memory products - Al Kossow's Bitsavers

-~-----.-.. .._ST27C256FN·ST27C256PREAD OPERATION)C CHARACTERISTICS (Tamb = TL to TH, VCC = 5V ± 10%, VSS = OV; Unless otherwise specified)Symbol Parameter Test ConditionsMin.ValuesTypJI)III Input Load Current VIN=Vee or GND 10 "AILO Output Leakage Current ~UT=Vee or VSS,CE=VIH 10 /LAVpp Vpp Read Voltage Vee- 0.7 Vee VVIL Input Low Voltage -0.1 0.8 VVIH Input High Voltage 2.0 Vee+ 1 VVOL Output Low Voltage IOL=2.1 mA 0.45 VIOL=O /LA 0.1VOH Output High Voltage IOH= -400 /LA 2.4 VIOH=O /LA Vee- 0.1lee2 Vee Supply Active Current CE = OE = VIL, Inputs = VIH or 10 30 mATTL LevelsVIL, 1=5 MHz, 1/0=0 mAleeSBI Vee Supply Standby Current CE = VIH OE = Inputs 0.05 1 mAleeSB2 Vee Supply Standby Current CE=Vee- O.1V,OE=lnputs 1 10 /LAIpPI Vpp Read Current Vpp = Vee =5.5V 100 /LA~ole: 1. Typical conditions are for operation at: T amb = + 25°C, Vee = 5V, Vpp = Vee, and VSS = OVMax.Unit~C CHARACTERISTICS(I ,2,3)(T amb = TL to T H)27C256 27C256 27C256 27C256Symbol Parameter Test Conditions ·17 ·20 ·25 ·30 UnitMin Max Min Max Min Max Min MaxtAee Address to Output Delay CE=OE=VIL 170 200 250 300 nsteE CE to Output Delay OE=VIL 170 200 250 300 nstOE Output Enable to CE=VIL 75 75 100 120 nsOutput DelaytOF(2)(4) OE or CE High to CE=VIL 0 50 0 55 0 60 0 75 nstOH Output Hold from CE=OE=VIL 0 0 0 0 nsaddresses, CE or OEwhichever occured first~APACITANCE Tamb = + 25°C, f = 1 MHzSymbol Parameter Test Conditions Min. Typ. Max. UnitCin Input Capacitance VIN=OV 4 6 pFCout Output Capacitance VOUT=OV 8 12 pFloles: I. Vee must be applied at the same time or before Vpp and removed after or at the same time as VPP'Vpp may be connectedto Vee except during program.2. The tOF compare level is determined as follows:High to THREE-STATE, the measured VOH(OC) -O.tVLow to THREE-STATE the measured VOL(OC) + o. tV.3. Capacitance is guaranlaed BlL-Ileriodic testing. T am/l = + 25°C, f = I MHz.4. T DF, is specified from OE or eE whichever occurs first. This parameter is only sampled and not 100% tested.3/10....._.._....._._..._----_._--_...- .._-----189