M58LT256JST datasheet(50/106 Pages) STMICROELECTRONICS

50 / 106 page

Program and Erase times and endurance cycles

M58LT256JST, M58LT256JSB

50/106

Program and Erase times and endurance cycles

The Program and Erase times and the number of Program/ Erase cycles per block are

shown in Table 16. Exact Erase times may change depending on the memory array

condition. The best case is when all the bits in the block are at ‘0’ (pre-programmed). The

worst case is when all the bits in the block are at ‘1’ (not pre-programmed). Usually, the

system overhead is negligible with respect to the Erase time. In the M58LT256JST/B the

maximum number of Program/Erase cycles depends on the VPP voltage supply used.

Table 16.

Program/Erase times and endurance cycles(1), (2)

Parameter

Condition

Min

Typ

Typical after

100 kW/E

cycles

Max

Unit

Erase

Parameter Block (16 kword)

0.4

2.5

Main Block

(64 kword)

Pre-programmed

Not pre-programmed

1.2

Program(3)

Single word

Word Program

400

µs

Buffer Program

400

µs

Buffer (32 words) (Buffer Program)

300

1200

µs

Main block (64 kword)

600

Suspend Latency

Program

µs

Erase

µs

Program/Erase

Cycles (per Block)

Main blocks

100,000

cycles

Parameter Blocks

100,000

cycles

Erase

Parameter Block (16 kword)

0.4

2.5

Main Block (64 kword)

Program(3)

Single word

Word Program

400

µs

Buffer Enhanced Factory

Program(4)

5400

µs

Buffer (32

words)

Buffer Program

180

1200

µs

Buffer Enhanced Factory Program

150

1000

µs

Main Block

(64 kwords)

Buffer Program

360

Buffer Enhanced Factory Program

300

Bank (16

Mbits)

Buffer Program

5.8

Buffer Enhanced Factory Program

4.8

Program/Erase

Cycles (per Block)

Main blocks

1000

cycles

Parameter Blocks

2500

cycles

Blank Check

Main blocks

Parameter Blocks

0.5

TA = –25 to 85 °C; VDD = 1.7 V to 2 V; VDDQ = 1.7 V to 3.6 V.

Values are liable to change with the external system-level overhead (command sequence and Status Register polling

execution).

Excludes the time needed to execute the command sequence.

This is an average value on the entire device.

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