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Rev 0; 6/04

9-Bit I

2

C Nonvolatile

I/O Expander Plus Memory

General Description

The DS4520 is a 9-bit nonvolatile (NV) I/O expander with

64 bytes of NV user memory controlled by an I

2

C

TM

-

compatible serial interface. The DS4520 offers users a

digitally programmable alternative to hardware jumpers

and mechanical switches that are being used to control

digital logic nodes. Furthermore, the digital state of each

pin can be read through the serial interface. Each I/O

pin is independently configurable. The outputs are open

drain with selectable pullups. Each output has the ability

to sink up to 12mA. Since the device is NV, it powers up

in the desired state allowing it to control digital logic

inputs immediately on power-up without having to wait

for the host CPU to initiate control.

Features

鈾?/div>

Programmable Replacement for Mechanical

Jumpers and Switches

鈾?/div>

Nine NV Input/Output Pins

鈾?/div>

64-Byte NV User Memory (EEPROM)

鈾?/div>

I

2

C-Compatible Serial Interface

鈾?/div>

Up to 8 Devices Can be Multidropped on the

Same I

2

C Bus

鈾?/div>

Open-Drain Outputs with Configurable Pullups

鈾?/div>

Outputs Capable of Sinking 12mA

鈾?/div>

Low Power Consumption

鈾?/div>

Wide Operating Voltage (2.7V to 5.5V)

鈾?/div>

Operating Temperature Range: -40擄C to +85擄C

DS4520

Applications

RAM-Based FPGA Bank Switching for

Multiple Profiles

Selecting Between Boot Flash

Setting ASIC Configurations/Profiles

Servers

Network Storage

Routers

Telecom Equipment

PC Peripherals

Ordering Information

PART

DS4520E

TEMP RANGE

-40擄C to +85擄C

PIN-PACKAGE

16 TSSOP

Add 鈥?T&R鈥?for tape and reel orders.

Typical Operating Circuit

V

CC

Pin Configuration

TOP VIEW

I/O_0 1

16 GND

15 I/O_8

14 I/O_7

0.1碌F

4.7k鈩?/div>

FROM

SYSTEM

CONTROLLER

4.7k鈩?/div>

V

CC

DS4520

I/O_0

I/O_1

I/O_2

I/O_3

I/O_4

I/O_5

I/O_6

I/O_7

I/O_8

CLOCK

GENERATOR

CPU

SPEED

SELECT

FPGA

I/O_1 2

I/O_2 3

I/O_3 4

I/O_4 5

A0 6

A1 7

V

CC

8

SCL

SDA

A0

A1

A2

GND

DS4520

13 I/O_6

12 I/O_5

11 A2

10 SCL

9

SDA

I

2

C is a trademark of Philips Corp. Purchase of I

2

C components from Maxim Integrated Products, Inc., or one of its sublicensed

Associated Companies, conveys a license under the Philips I

2

C Patent Rights to use these components in an I

2

C system, provided

that the system conforms to the I

2

C Standard Specification as defined by Philips.

______________________________________________

Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

制造商
Maxim Integrated Products
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