Rainbow-electronics W27E020 User Manual

Preliminary W27E020256K × 8 ELECTRICALLY ERASABLE EPROMPublication Release Date: December 1997- 1 - Revision A1GENERAL DESCRIPTIONThe W27E020 is a hig

Preliminary W27E020- 10 -SMART PROGRAMMING ALGORITHMStartAddress = First LocationVcc = 5VVpp = 12VX = 0Increment XX = 25?VerifyOne ByteLastAddress?Vcc

Preliminary W27E020Publication Release Date: December 1997- 11 - Revision A1SMART ERASE ALGORITHMStartVcc = 5VVpp = 14VIncrement XLastAddress?Vcc = 5V

Preliminary W27E020- 12 -ORDERING INFORMATIONPART NO. ACCESSTIME(nS)POWER SUPPLYCURRENT MAX.(mA)STANDBY VCCCURRENT MAX.(µA)PACKAGEW27E020-70 70 30 10

Preliminary W27E020Publication Release Date: December 1997- 13 - Revision A1PACKAGE DIMENSIONS32-pin P-DIPSeating PlaneeA2AacEBase Plane1A1eLAS1ED1BB3

Preliminary W27E020- 14 -VERSION HISTORYVERSION DATE PAGE DESCRIPTIONA1 Dec. 1997 Initial IssuedHeadquartersNo. 4, Creation Rd. III,Science-Based Indu

Preliminary W27E020- 2 -FUNCTIONAL DESCRIPTIONRead ModeLike conventional UVEPROMs, the W27E020 has two control functions, both of which produce dataat

Preliminary W27E020Publication Release Date: December 1997- 3 - Revision A1Standby ModeThe standby mode significantly reduces VCC current. This mode i

Preliminary W27E020- 4 -DC CHARACTERISTICSAbsolute Maximum RatingsPARAMETER RATING UNITAmbient Temperature with Power Applied -55 to +125°CStorage Tem

Preliminary W27E020Publication Release Date: December 1997- 5 - Revision A1CAPACITANCE(VCC = 5V, TA = 25° C, f = 1 MHz)PARAMETER SYMBOL CONDITIONS MAX

Preliminary W27E020- 6 -READ OPERATION DC CHARACTERISTICS(Vcc = 5.0V ±10%)PARAMETER SYM. CONDITIONS LIMITS UNITMIN. TYP. MAX.Input Load Current ILI V

Preliminary W27E020Publication Release Date: December 1997- 7 - Revision A1DC PROGRAMMING CHARACTERISTICS(VCC = 5.0V ±10%, TA = 25° C ±5° C)PARAMETER

Preliminary W27E020- 8 -TIMING WAVEFORMSAC Read WaveformCEOutputsTHigh ZHigh ZValid OutputCETOETACCTOHTDFAddress Address Valid VILVIHVIHVILVIHVILOEEra

Preliminary W27E020Publication Release Date: December 1997- 9 - Revision A1Timing Waveforms, continuedProgramming WaveformAddressData12.0V5.0VCEAddres