M24C08 datasheet(7/34 Pages) STMICROELECTRONICS

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DocID024020 Rev 2

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M24C01/02-W M24C01/02-R M24C02-F

Signal description

2.1

Serial Clock (SCL)

The signal applied on the SCL input is used to strobe the data available on SDA(in) and to

output the data on SDA(out).

2.2

Serial Data (SDA)

SDA is an input/output used to transfer data in or data out of the device. SDA(out) is an

open drain output that may be wire-OR’ed with other open drain or open collector signals on

the bus. A pull-up resistor must be connected from Serial Data (SDA) to VCC (Figure 10

indicates how to calculate the value of the pull-up resistor).

2.3

Chip Enable (E2, E1, E0)

(E2,E1,E0) input signals are used to set the value that is to be looked for on the three least

significant bits (b3, b2, b1) of the 7-bit device select code. These inputs must be tied to VCC

or VSS, as shown in Table 2: Device select code. When not connected (left floating), these

inputs are read as low (0).

2.4

Write Control (WC)

This input signal is useful for protecting the entire contents of the memory from inadvertent

write operations. Write operations are disabled to the entire memory array when Write

Control (WC) is driven high. Write operations are enabled when Write Control (WC) is either

driven low or left floating.

When Write Control (WC) is driven high, device select and address bytes are

acknowledged, Data bytes are not acknowledged.

2.5

VSS (ground)

VSS is the reference for the VCC supply voltage.

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