29W040 データシートの表示（PDF） - STMicroelectronics

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29W040

4 Mbit 512Kb x8 / Uniform Block Low Voltage Single Supply Flash Memory

STMicroelectronics 

M29W040

Table 12B. Read AC Characteristics

(TA = 0 to 70°C, –20 to 85°C or –40 to 85°C)

M29W040

Symbol Alt

Parameter

Test Condition

-150

-200

Unit

VCC = 2.7V to 3.6V VCC = 2.7V to 3.6V

Min

Max

Min

Max

tAVAV

tRC

Address Valid to Next Address

Valid

E = VIL, G = VIL

150

200

ns

tAVQV tACC Address Valid to Output Valid

E = VIL, G = VIL

150

200 ns

tELQX (1)

tLZ

Chip Enable Low to Output

Transition

G = VIL

0

0

ns

tELQV (2) tCE Chip Enable Low to Output Valid

G = VIL

150

200 ns

tGLQX (1)

tOLZ

Output Enable Low to Output

Transition

E = VIL

0

0

ns

tGLQV (2)

tOE

Output Enable Low to Output

Valid

E = VIL

55

70

ns

tEHQX

tEHQZ (1)

tGHQX

tOH

Chip Enable High to Output

Transition

tHZ Chip Enable High to Output Hi-Z

tOH

Output Enable High to Output

Transition

G = VIL

G = VIL

E = VIL

0

0

ns

40

50

ns

0

0

ns

tGHQZ (1)

tDF

Output Enable High to Output

Hi-Z

E = VIL

40

50

ns

tAXQX

tOH

Address Transition to Output

Transition

E = VIL, G = VIL

0

0

ns

Notes: 1. Sampled only, not 100% tested.

2. G may be delayed by up to tELQV - tGLQV after the falling edge of E without increasing tELQV.

Read Array/Reset (RST) instruction. The Reset

instruction consists of one write operation giving

the command F0h. It can be optionally preceded

by the two coded cycles. A wait state of 5µs before

read operationsis necessaryif the Reset command

is applied during an Erase or Power Down opera-

tion.

Read Electronic Signature (RSIG) instruction.

This instruction uses the two coded cycles followed

by one write cycle giving the command 90h to

address 5555h for command setup. A subsequent

read will output the manufacturer code, the device

code or the Block Protection status depending on

the levels of A0, A1, A6, A16, A17 and A18. The

manufacturer code, 20h, is output when the ad-

dresses lines A0, A1 and A6 are Low, the device

code, E2h is output when A0 is High with A1 and

A6 Low.

Read Block Protection (RBP) instruction. The

use of Read ElectronicSignature(RSIG) command

also allows access to the Block Protection status

verify. After giving the RSIG command, A0 and A6

are set to VIL with A1 at VIH, while A16, A17 and

A18 define the block of the block to be verified. A

read in these conditions will output a 01h if block is

protected and a 00h if block is not protected.

This Read Block Protection is the only valid way to

check the protection status of a block. Neverthe-

less, it must not be used during the block protection

phase as a method to verify the Block Protection.

Please refer to Block Protection paragraph.

Power Down (PD) instruction. The Power Down

instruction uses one write cycle to put the memory

into a power down mode where current consump-

tion is typically reduced to less than 1.0µA. Once

in this state, a Reset (RST) command must be

written to the P/E.C. prior to any operation.

11/31

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