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M93C46-DS7T View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
M93C46-DS7T 16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit (8-bit or 16-bit wide) MICROWIRE® Serial Access EEPROM ST-Microelectronics
STMicroelectronics ST-Microelectronics
M93C46-DS7T Datasheet PDF : 31 Pages
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M93C86, M93C76, M93C66, M93C56, M93C46
SUMMARY DESCRIPTION
These electrically erasable programmable memo-
ry (EEPROM) devices are accessed through a Se-
rial Data Input (D) and Serial Data Output (Q)
using the MICROWIRE bus protocol.
Figure 2. Logic Diagram
D
C
S
ORG
VCC
M93Cx6
VSS
Q
AI01928
Table 2. Signal Names
S
Chip Select Input
D
Serial Data Input
Q
Serial Data Output
C
Serial Clock
ORG
Organisation Select
VCC
Supply Voltage
VSS
Ground
The memory array organization may be divided
into either bytes (x8) or words (x16) which may be
selected by a signal applied on Organization Se-
lect (ORG). The bit, byte and word sizes of the
memories are as shown in Table 3..
Table 3. Memory Size versus Organization
Device
Number
of Bits
Number
of 8-bit
Bytes
Number
of 16-bit
Words
M93C86
16384
2048
1024
M93C76
8192
1024
512
M93C66
4096
512
256
M93C56
2048
256
128
M93C46
1024
128
64
The M93Cx6 is accessed by a set of instructions,
as summarized in Table 4., and in more detail in
Table 5. to Table 7.).
Table 4. Instruction Set for the M93Cx6
Instruction
Description
Data
READ
Read Data from Memory Byte or Word
WRITE
Write Data to Memory Byte or Word
EWEN
Erase/Write Enable
EWDS
Erase/Write Disable
ERASE
Erase Byte or Word
Byte or Word
ERAL
Erase All Memory
WRAL
Write All Memory
with same Data
A Read Data from Memory (READ) instruction
loads the address of the first byte or word to be
read in an internal address register. The data at
this address is then clocked out serially. The ad-
dress register is automatically incremented after
the data is output and, if Chip Select Input (S) is
held High, the M93Cx6 can output a sequential
stream of data bytes or words. In this way, the
memory can be read as a data stream from eight
to 16384 bits long (in the case of the M93C86), or
continuously (the address counter automatically
rolls over to 00h when the highest address is
reached).
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 8 or 16 bits
at a time into one of the byte or word locations of
the M93Cx6. After the start of the programming cy-
cle, a Busy/Ready signal is available on Serial
Data Output (Q) when Chip Select Input (S) is driv-
en High.
4/31
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