M28010 datasheet(2/23 Pages) STMICROELECTRONICS

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M28010

2/23

Figure 2A. DIP Connections

Note: 1. DU = Do Not Use

Figure 2B. PLCC Connections

Note: 1. DU = Do Not Use

DQ0

A13

A10

DQ7

A14

A11

DQ5

DQ1

DQ2

DQ3

VSS

DQ4

DQ6

A12

VCC

AI02222

M28010

A15

A16

AI02223

A10

DQ0

A11

A14

DQ7

M28010

A13

Figure 2C. TSOP Connections

Note: 1. DU = Do Not Use

A11

DQ7

DQ5

DQ0

DQ1

DQ3

DQ4

DQ6

A13

A15

A14

VCC

A12

AI02224

M28010

VSS

A10

DQ2

A16

The device has been designed to offer a flexible

microcontroller interface, featuring both hardware

and software hand-shaking, with Data Polling and

Toggle Bit. The device supports a 128 byte Page

Write operation. Software Data Protection (SDP)

is also supported, using the standard JEDEC

algorithm.

The M28010 is designed for applications requiring

as much as 100,000 write cycles and ten years of

data retention. The organization of the data in a 4

byte (32-bit) “word” format leads to significant

savings in power consumption. Once a byte has

been read, subsequent byte read cycles from the

same “word” (with addresses differing only in the

two least significant bits) are fetched from the

previously loaded Read Buffer, not from the

memory array. As a result, the power consumption

for these subsequent read cycles is much lower

than the power consumption for the first cycle. By

careful design of the memory access patterns, a

50% reduction in the power consumption is

possible.

SIGNAL DESCRIPTION

The external connections to the device are

summarized in Table 1, and their use in Table 3.

Addresses (A0-A16). The address inputs are

used to select one byte from the memory array

during a read or write operation.

Data In/Out (DQ0-DQ7). The contents of the data

byte are written to, or read from, the memory array

through the Data I/O pins.

Chip Enable (E). The chip enable input must be

held low to enable read and write operations.

When Chip Enable is high, power consumption is

reduced.

Output Enable (G). The Output Enable input

controls the data output buffers, and is used to

initiate read operations.

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