24VL024HSLASHMS datasheet(5/28 Pages) MICROCHIP

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DS22109A-page 5

24VL024H

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

2.1

SDA Serial Data

This is a bidirectional pin used to transfer addresses

and data into and out of the device. It is an open drain

terminal. Therefore, the SDA bus requires a pull-up

resistor to VCC (typical 10 k

Ω for 100 kHz, 2 kΩ for

400 kHz).

For normal data transfer, SDA is allowed to change

only during SCL low. Changes during SCL high are

reserved for indicating the Start and Stop conditions.

2.2

SCL Serial Clock

The SCL input is used to synchronize the data transfer

to and from the device.

2.3

A0, A1, A2

The A0, A1 and A2 inputs are used by the 24VL024H

for multiple device operations. The levels on these

inputs are compared with the corresponding bits in the

slave address. The chip is selected if the compare is

true.

Up to eight 24VL024H devices may be connected to

the same bus by using different Chip Select bit

combinations. These inputs must be connected to

either VCC or VSS.

In most applications the chip address inputs, A0, A1

and A2, are hard-wired to logic ‘0’ or logic ‘1’. For

applications in which these pins are controlled by a

microcontroller or other programmable device, the chip

address pins must be driven to logic ‘0’ or logic ‘1’

before normal device operation can proceed.

2.4

WP is the hardware write-protect pin. It must be tied to

VCC or VSS. If tied to VCC, the hardware write protection

is enabled and will protect half of the array (80h-FFh).

If the WP pin is tied to VSS the hardware write

protection is disabled.

2.5

Noise Protection

The 24VL024H employs a VCC threshold detector cir-

cuit that disables the internal erase/write logic if the

VCC is below 1.2 volts at nominal conditions.

The SCL and SDA inputs have Schmitt Trigger and

filter circuits that suppress noise spikes to assure

proper device operation, even on a noisy bus.

Name

8-pin

PDIP

8-pin

SOIC

8-pin

TSSOP

8-pin

MSOP

8-pin

TDFN

Function

User Configurable Chip Select

VSS

Ground

SDA

Serial Data

SCL

Serial Clock

Write-Protect Input

VCC

+1.5V to 3.6V

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