BL24C02A/04A/08A/16A

BL24C02A/04A/08A/16A Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited

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2-16

Pin Descriptions

Pin Name

Type

Functions

A0-A2

I

Address Inputs

SDA

I/O

Serial Data

SCL

I

Serial Clock Input

WP

I

Write Protect

GND

P

Ground

Vcc

P

Power Supply

Block Diagram

START STOP

LOGIC

SERIAL CONTROL

LOGIC

SCL

SDA

GND

Vcc

DEVICE ADDRESS

COMPARATOR

LOAD

CCMP

DATA WORD

ADRESS COUNTER

LOAD

INC

Y DECODER

SERIAL MUX

EEPROM

EN

DATA RECOVERY

HIGH VOLTAGE

PUMP/TIMING

DOUT/ACKNOWLEDGE

DIN

DOUT

A0

A1

A2

WP

DEVICE/PAGE ADDRESSES (A2, A1 and A0):

The A2, A1 and A0 pins are device address inputs that are hard

wire for the BL24C02A/BL24C04A/BL24C08A/BL24C16A. Eight 2K/4K/8K/16K devices may be addressed

on a single bus system (device addressing is discussed in detail under the Device Addressing section).

SERIAL DATA (SDA):

The SDA pin is bi-directional for serial data transfer. This pin is open-drain driven

and may be wire-ORed with any number of other open-drain or open- collector devices.

SERIAL CLOCK (SCL):

The SCL input is used to positive edge clock data into each EEPROM device

and negative edge clock data out of each device.

Table 1

Figure 1