DS4520 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 9-Bit I2C Nonvolatile I/O Expander Plus Memory

Rev 0; 6/04
9-Bit I²C 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 I²C^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.
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
Typical Operating Circuit
Features
♦ Programmable Replacement for Mechanical
Jumpers and Switches
♦ Nine NV Input/Output Pins
♦ 64-Byte NV User Memory (EEPROM)
♦ I²C-Compatible Serial Interface
♦ Up to 8 Devices Can be Multidropped on the
Same I²C Bus
♦ Open-Drain Outputs with Configurable Pullups
♦ Outputs Capable of Sinking 12mA
♦ Low Power Consumption
♦ Wide Operating Voltage (2.7V to 5.5V)
♦ Operating Temperature Range: -40°C to +85°C
Ordering Information
PART
TEMP RANGE
DS4520E
-40°C to +85°C
Add “/T&R” for tape and reel orders.
PIN-PACKAGE
16 TSSOP
Pin Configuration
V_CC
0.1µF
4.7kΩ
FROM
SYSTEM
CONTROLLER
V_CC
4.7kΩ
SCL
SDA
A0
A1
A2
GND
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
FPGA
CLOCK
GENERATOR
CPU
SPEED
SELECT
TOP VIEW
I/O_0 ₁
I/O_1 2
I/O_2 3
I/O_3 4
I/O_4 5
A0 6
A1 7
V_CC 8
DS4520
16 GND
15 I/O_8
14 I/O_7
13 I/O_6
12 I/O_5
11 A2
10 SCL
9 SDA
I²C is a trademark of Philips Corp. Purchase of I²C components from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I²C Patent Rights to use these components in an I²C system, provided
that the system conforms to the I²C 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’s website at www.maxim-ic.com.