M491B datasheet(5/16 Pages) STMICROELECTRONICS

Part #	M491B

Description	SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL

PDF	16 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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5 / 16 page

I (mA)

Typ. max. 20msec

Typ. max. 8msec

t (ms)

Figure 2

ERASE CYCLE

Figure 3 shows the timing and the waveform of the

current flowing through Pin 2 during the erase

operation. The peak current is 7mA (max) during

the erase cycle and 6mA (max) during the read

cycle. The typical erase time is 10ms for a new

device and increases with the number of modify

operations up to 200ms after 1000 cycles.

In order to protect the memory in case of failure of

some bits the modify operation is stopped after

1sec.

READ CYCLE

Figure 4 shows the waveform of the current during

a read operation.

32 44

256

µs

6mA

7mA

128

µs

Figure 3

32 44

116

µs

256

µs

40mA

6mA

12mA

After about 30msec

Figure 1

6mA

128

µs

480

µs

Figure 4

M491B

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