M93S56-125 datasheet(6/28 Pages) STMICROELECTRONICS

No de pièce	M93S56-125

Description	Automotive 4-Kbit, 2-Kbit and 1-Kbit MICROWIRE serial EEPROM with block protection

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Description

M93S66-125 M93S56-125 M93S46-125

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Doc ID 022567 Rev 1

Chip Select Input (S) is held High, the M93Sx6-125 can output a sequential stream of data

words. In this way, the memory can be read as a data stream from 16 to 4096 bits (for the

M93S66-125), or continuously as the address counter automatically rolls over to 00h when

the highest address is reached.

Within the time required by a programming cycle (tW), up to 4 words may be written with

help of the Page Write instruction. the whole memory may also be erased, or set to a

predetermined pattern, by using the Write All instruction.

Within the memory, a user defined area may be protected against further Write instructions.

The size of this area is defined by the content of a Protection register, located outside of the

memory array. As a final protection step, data may be permanently protected by

programming a One Time Programming (OTP) bit which locks the Protection register

content.

Programming is internally self-timed (the external clock signal on Serial Clock (C) may be

stopped or left running after the start of a Write cycle) and does not require an erase cycle

prior to the Write instruction. The Write instruction writes 16 bits at a time into one of the

word locations of the M93Sx6-125, the Page Write instruction writes up to 4 words of 16 bits

to sequential locations, assuming in both cases that all addresses are outside the Write

protected area. After the start of the programming cycle, a Busy/Ready signal is available on

Serial Data Output (Q) when Chip Select Input (S) is driven High.

An internal Power-on Data Protection mechanism in the M93Sx6-125 inhibits the device

when the supply is too low.

Figure 2.

8-pin package connections (top view)

Note:

See Section 9: Package mechanical data section for package dimensions, and how to

identify pin-1.

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