m29f040 STMicroelectronics, m29f040 Datasheet - Page 9

• Manufacturer Part Number: m29f040
• Description: 4 Mbit 512kb X8, Uniform Block Single Supply Flash Memory
• Manufacturer: STMicroelectronics

Table 9. AC Measurement Conditions
Figure 4. AC Testing Input Output Waveform
Table 10. Capacitance
Note: 1. Sampled only, not 100% tested.
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 s, 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.
Input Rise and Fall Times
Input Pulse Voltages
Input and Output Timing Ref. Voltages
High Speed
Standard
Symbol
0.45V
2.4V
C
C
3V
0V
OUT
IN
Input Capacitance
Output Capacitance
Parameter
(1)
(T
A
= 25 C, f = 1 MHz )
AI01275B
1.5V
2.0V
0.8V
Test Condition
High Speed
V
V
OUT
IN
0 to 3V
1.5V
10ns
= 0V
Figure 5. AC Testing Load Circuit
= 0V
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 s 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.
C L = 30pF for High Speed
C L = 100pF for Standard
C L includes JIG capacitance
DEVICE
UNDER
TEST
Min
1.3V
1N914
3.3k
0.45V to 2.4V
0.8V and 2V
C L
Max
Standard
12
6
10ns
OUT
M29F040
AI01276B
Unit
pF
pF
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