29F040 datasheet(9/31 Pages) STMICROELECTRONICS

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AI01275B

High Speed

1.5V

2.4V

Standard

0.45V

2.0V

0.8V

Figure 4. AC Testing Input Output Waveform

AI01276B

1.3V

OUT

CL = 30pF for High Speed

CL = 100pF for Standard

CL includes JIG capacitance

3.3k

Ω

1N914

DEVICE

UNDER

TEST

Figure 5. AC Testing Load Circuit

Symbol

Parameter

Test Condition

Min

Max

Unit

CIN

Input Capacitance

VIN = 0V

COUT

Output Capacitance

VOUT = 0V

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

Table 10. Capacitance (1) (TA = 25

°C, f = 1 MHz )

Erase Timer bit (DQ3). This bit is set to ’0’ by the

P/E.C. when the last Block Erase command has

been entered to the Command Interface and it is

awaiting the Erase start. When the wait period is

finished, after 80 to 120

µs, DQ3 returns back to ’1’.

Coded Cycles. The two coded cycles unlock the

Command Interface. They are followed by a com-

mand input or a comand confirmation. The coded

cycles consist of writing the data AAh at address

5555h during the first cycle and data 55h at address

2AAAh during the second cycle. Addresses are

latched on the falling edge of W or E while data is

latched on the rising edge of W or E. The coded

cycles happen on first and second cycles of the

command write or on the fourth and fifth cycles.

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 5

µs before

read operations is necessary if the Reset command

is applied during an Erase operation.

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.

High Speed

Standard

Input Rise and Fall Times

≤ 10ns

Input Pulse Voltages

0 to 3V

0.45V to 2.4V

Input and Output Timing Ref. Voltages

1.5V

0.8V and 2V

Table 9. AC Measurement Conditions

9/31

M29F040

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