M29F040 datasheet(14/31 Pages) STMICROELECTRONICS

14 / 31 page

Symbol

Alt

Parameter

M29F040

Unit

-70

-90

VCC = 5V

± 10%

VCC = 5V

± 10%

Standard

Interface

Standard

Interface

Min

Max

Min

Max

tAVAV

tWC

Address Valid to Next Address Valid

tELWL

tCS

Chip Enable Low to Write Enable Low

tWLWH

tWP

Write Enable Low to Write Enable High

tDVWH

tDS

Input Valid to Write Enable High

tWHDX

tDH

Write Enable High to Input Transition

tWHEH

tCH

Write Enable High to Chip Enable High

tWHWL

tWPH Write Enable High to Write Enable Low

tAVWL

tAS

Address Valid to Write Enable Low

tWLAX

tAH

Write Enable Low to Address Transition

tGHWL

Output Enable High to Write Enable Low

tVCHEL

tVCS

VCC High to Chip Enable Low

µs

tWHQV1

(1)

Write Enable High to Output Valid (Program)

µs

tWHQV2

(1)

Write Enable High to Output Valid

(Block Erase)

1.0

sec

tWHGL

tOEH

Write Enable High to Output Enable Low

Note: 1. Time is measured to Data Polling or Toggle Bit, tWHQV = tWHQ7V + tQ7VQV

2. The temperature range –40 to 125

°C is guaranteed at 70ns with High Speed Interface test condition and VCC = 5V ± 5%.

Table 13A. Write AC Characteristics, Write Enable Controlled

(TA = 0 to 70

°C, –20 to 85°C, –40 to 85°C or –40 to 125°C)(2)

Erase Resume (ER) instruction. If an Erase Sus-

pend instruction was previously executed, the

erase operation may be resumed by giving the

command 30h, at any address, and without any

coded cycles.

Power Up

The memory Command Interface is reset on power

up to Read Array. Either E or W must be tied to VIH

during Power-up to allow maximum security and

the possibility to write a command on the first rising

adge of E or W. Any write cycle initiation is blocked

when VCC is below VLKO.

Supply Rails

Normal precautions must be taken for supply volt-

age decoupling, each device in a system should

have the VCC rail decoupled with a 1.0

µF capacitor

close to the VCC and VSS pins. The PCB trace

widths should be sufficient to carry the VCC pro-

gram and erase currents required.

14/31

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