W78LE812 datasheet(19/25 Pages) WINBOND

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W78LE812

Publication Release Date: February 1999

- 19 -

Revision A2

Program Operation

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

VPP Setup Time

TVPS

2.0

µS

Data Setup Time

TDS

2.0

µS

Data Hold Time

TDH

2.0

µS

Address Setup Time

TAS

2.0

µS

Address Hold Time

TAH

µS

Program Pulse Width for

Program Operation

TPWP

290

300

310

µS

OECTRL Setup Time

TOCS

2.0

µS

OECTRL Hold Time

TOCH

2.0

µS

Setup Time

TOES

2.0

µS

High to Output Float

TDFP

130

Data Valid from OE

TOEV

150

Note: Flash data can be accessed only in flash mode. The RST pin must pull in VIH status, the ALE pin must pull in VIL status, and

the PSEN pin must pull in VIH status.

TIMING WAVEFORMS

Program Fetch Cycle

XTAL1

ALE

PORT 2

A0-A7

Data

A0-A7

Code

A0-A7

Data

Code

PORT 0

PSEN

PDH,

TPDZ

TPDA

TAAH

TAAS

TPSW

TAPL

TALW

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