M93C46 datasheet(4/31 Pages) STMICROELECTRONICS

4 / 31 page

M93C86, M93C76, M93C66, M93C56, M93C46

4/31

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.

In order to meet environmental requirements, ST

offers these devices in ECOPACK® packages.

ECOPACK® packages are Lead-free and RoHS

compliant.

ECOPACK is an ST trademark. ECOPACK speci-

fications are available at:

www.st.com.

Figure 2. Logic Diagram

Table 2. Signal Names

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

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

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

Chip Select Input

Serial Data Input

Serial Data Output

Serial Clock

ORG

Organisation Select

VCC

Supply Voltage

VSS

Ground

AI01928

VCC

M93Cx6

VSS

ORG

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

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

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