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M93S66-125 Datasheet(PDF) 5 Page - STMicroelectronics

Part # M93S66-125
Description  Automotive 4-Kbit, 2-Kbit and 1-Kbit MICROWIRE serial EEPROM with block protection
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M93S66-125 Datasheet(HTML) 5 Page - STMicroelectronics

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M93S66-125 M93S56-125 M93S46-125
Description
Doc ID 022567 Rev 1
5/28
1
Description
The M93S66-125, M93S56-125 and M93S46-125 are a range of 4-Kbit, 2-Kbit, and 1-Kbit
serial Electrically Erasable PROgrammable Memory (EEPROM) products. They are
collectively referred to as M93Sx6-125.
Figure 1.
Logic diagram
The M93Sx6-125 is accessed through a Serial Data Input (D) and Serial Data Output (Q)
using the MICROWIRE bus protocol. The memory is divided into 256, 128 and 64 x16-bit
words (respectively for M93S66-125, M93S56-125 and M93S46-125).
The M93Sx6-125 is accessed by a set of instructions which includes Read, Write,
Page Write, Write All and instructions used to set the memory protection. These are
summarized in Table 2 and Table 3.
A Read data from memory (READ) instruction loads the address of the first word to be read
into an internal address pointer. The data contained at this address is then clocked out
serially. The address pointer is automatically incremented after the data is output and, if the
Table 1.
Signal names
Signal name
Description
S
Chip Select Input
D
Serial Data Input
Q
Serial Data Output
C
Serial Clock
PRE
Protection Register Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground


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