M27128A INTEL | Alldatasheet
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reliability and manufacturability. an efficient programming method. or choosing between non-volatile memory alternatives. Figure 1. Block Diagram ors | Sto | Gu [om] SA ue [os los fo Lo
a ABSOLUTE MAXIMUM RATINGS* NOTICE: This is a production data sheet, The specifi- 1 . . cations are subject to change without notice. Case Temperature Under Bias...—55°Cto+125°C Sapna: Sressing the the “A All Input or Output Voltages with These are stress ratings only. Operation beyond the " tended exposure beyond the “Operating Conditions Voltage on Pin 24 with may affect device reliability. Vpp Supply Voltage with Respect to Operating Conditions [to | _CasoTorperaturo instanton | ss tvs | | [voc | Distal Suppiyvotage | aso [sso TY READ OPERATION D. C. CHARACTERISTICS (Over Specified Operating Conditions) ee [ur |e inputtoadourent [TT to Tk | wescv | [no | OutputLoskagecurent [| | 0 Tuk | Vourmssv | [tee | VepGurenteas | | TT mA | Vp sc [tcci@ | VocOurentstandty || | oT ma | Ev [toca | VocOurentacive | | | a0 | oma | CECE, | [vu | tnputtowvotage | -o1 | | vos | v [| [Vin | Inputrigh vonage | 20 | | Moots | v [| [Vor | Ouputtowvotage | | | om] vin atma | [You | Ouputrighvorae [2a | | Tv tow a00un | [veo@® | VepReadvotage | 38 | | vec | v | vocrsoveosv | A.C. CHARACTERISTICS [ome [ree | oe | cm [win [max [win [Max _| [taco | AdsrosstoOuiputdelsy | | 200 | | s00 | me | Ce-ce-w | [ice | BE tOuiputdoy | | 200 | | a0 | me | EM [toc | DE to Ouputdoey | | es | | io [ ms | e-w | [tort | DEnightoOuputrict | 0 | es | 0 | eo [ ms | e-w | Output Hold from: CE = CE=- MW Addresses CE or OE Whichever Occurred First NOTES: 1. Voce must be applied simultaneously or before Vpp and removed simultaneously or after Vpp. 2. Vpp may be connected directly to Voc except during programming, The supply current would then be the sum of Ioc and i 3. Typical values are for To = 25°C and nominal supply voltages. 4. Output Float is defined as the point where data is no longer driven—see timing diagram on the following page. 7-33
CAPACITANCE Tc =25°C, f=1 MHz [Symbot] Parameter | Typ‘) Max] Units | Conditions| [Gm [inputCapacitance | 4 | 6 | pF | Viv=ov | Output Capacitance] 6 | 12 | pF | Vour=ov A.C. TESTING INPUT, OUTPUT WAVEFORM AS. TESTING LOAD CIRCUIT av a K inore ta 77 > reson Z xs os os pevice eas One Oour 210603-3 vest a for @ Logie “0”. Timing Measurements are made at 2.0V for a GL - 10096 210603-4 Logic "1" and 0.8V for a Logic “0" Cf Includes Jig A.C. WAVEFORMS ‘ADORESSES: = . vm a wm co oe Me see tom ee oe our —t au ourPuT lene 210603-5 NOTES: 1, yea values are for T¢= 25°C and nominal supply voltages. 2. OE may be delayed up to tce—toe after the falling edge of CE without impact on tog. 3. This parameter is only sampled and is not 100% tested. Output float is defined as the point where data is no longer driven. 7-34
Table 1. Mode Selection data is desired from a particular memory device. Wverty [Va [Vil Vin | X [Vee|Voc] Dour | EPROM require careful decoupling of the devices.
- X can be Vin oF Vit- capacitive loading of the device. The associated
Because EPROMs are usually used in larger memo- both “1s” and “0s” can be present in the data word. Ty arrays, Intel has provided 2 control lines which The only way to change a "0" to a "1" is by ultravio. accommodate this multiple memory connection. The let light erasure.
required for the address and data inputs are TTL. at Vi., PGM at Vi and Vpp at 12.5V. The intgligent Programming Algorithm utilizes two gramming the M27128A. ond pulses per byte are provided for before the over- intgligent Identifier Mode. pared to the original data with Voc = Vpp = 5.0V. (07) defined as the parity bit. will program the selected M27128A. Table 2. M27128A Intgligent Identifier™ Bytes 2.Ay — Ag Ato ~ Arg, CE, OE = Vit.
<< ves me 3 - | ass SP mes OUNATNSS pass 210808-6 Figure 3.M27128A Inteligent Programming™ Flowchart 7-37
. . intel M27128A to cause erasure when exposed to direct sunlight. If The erasure time with this dosage is approximately the M27128A Is to be exposed to these types of 15 to 20 minutes using an ultraviolet lamp with a lighting conditions for extended periods of time, 12000 nW/cm2 power rating. The M27128A should ‘opaque labels should be placed over the M27128A _be placed within 1 inch of the lamp tubes during era- window to prevent unintentional erasure. ‘sure. The maximum integrated dose a M27128A can id be exposed to without damage is 7258 Wsec/cm2 The recommended erasure procedure for the (1 week @ 12000 »W/cm2). Exposure of the M27128A is exposure to shortwave ultraviolet light | M27128A to high intensity UV light for longer periods which has a wavelength of 2537 Angstroms (A). The may cause permanent damage. integrated dose (i.e., UV intensity x exposure time) for erasure should be a minimum of 15 Wsec/cm2, inteligent Programming™ Algorithm D.C. PROGRAMMING CHARACTERISTICS (Over Specified Operating Conditions) inp Cot a np) a ee OutputLow Voltage During erty || ous | V | lo =2.1ma OutptighVotage Dung Venty [24 |__| v_| owe —00nA | “Voc Supply Curent Programa veri) | | 100 | ma [| [ieee | Vee Supply Curent Program) re | Agintligent identifier Voltage Pus [ws] ov J NOTE: 1. Voc must be applied simultaneously or before Vp and removed simultaneously or after Vpp. 7-38
A.C. PROGRAMMING CHARACTERISTICS (Over Specified Operating Conditions) ee ee a | min | typ [ Max | unit | (Note) | us | AddrossSowpTime | 2 | TT ws | | toes | OEseuptime ss | 2 | || os | | tos | Datasowptime | 2 | | | ws | | tui | AddessHoidtime | oo | TT ws | [toy | DataHolgtime | 2 | TT ws | | torr) | OEHightoOutputFloatDelay | o | | 130 [| ns | | | tes | VepSeuptime ss | 2 | TT ws | ee Ps [tow | PGMiniiai Program Putse with | 095 | 1.0 | 105 | ms | (Notes) | [topw | PEMOverprogramPusewiatn | 205 [| 7e75 | ms | (Note2) | Ltoc | Datavaiatromoe | TT ts0 Ts | NOTES: 1. Voc must be applied simultaneously or before Vpp and removed simultaneously or after Vpp. 2. The length of the overprogram pulse may vary from 2.85 ms to 78.75 ms as a function of the iteration counter value X. 3. Initial Program Pulse width tolerance is 1 ms +5%. ‘4. Output Float is defined as the point where data is no longer drivan—see timing diagram. *A.C. CONDITIONS OF TEST 7-39
inteligent Programming™ WAVEFORMS veney Aopnesses ID we us ve sv ev Mec bev: Wes. Vo = # wey Yn cy ve We tone a we 210603-7 NOTES: 1. The Input Timing Reference Level is 0.8V for Vi. and 2V for a Vin. 2. tog and tp¢p are characteristics of the device but must be accommodated by the programmer. 3. When programming the M27128A, a 0.1 uF capacitor is required across Vpp and ground to supress spurious voltage transients which can damage the device. 7-40