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PDF DS4520 Data sheet ( Hoja de datos )

Número de pieza DS4520
Descripción I/O Expander Plus Memory
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! DS4520 Hoja de datos, Descripción, Manual

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 I2CTM-
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
VCC
0.1µF
4.7k
FROM
SYSTEM
CONTROLLER
VCC
4.7k
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
VCC 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.
Free Datasheet http://www.datasheet4u.com/

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DS4520 pdf
9-Bit I2C Nonvolatile
I/O Expander Plus Memory
Pin Description
PIN NAME
FUNCTION
1 I/O_0 Input/Output 0. Bidirectional I/O pin.
2 I/O_1 Input/Output 1. Bidirectional I/O pin.
3 I/O_2 Input/Output 2. Bidirectional I/O pin.
4 I/O_3 Input/Output 3. Bidirectional I/O pin.
5 I/O_4 Input/Output 4. Bidirectional I/O pin.
6 A0 I2C Address Input. Inputs A0, A1, and A2 determine the I2C slave address of the device.
7 A1 I2C Address Input. Inputs A0, A1, and A2 determine the I2C slave address of the device.
8 VCC Power-Supply Voltage
9 SDA I2C Serial Data Open-Drain Input/Output
10 SCL I2C Serial Clock Input
11 A2 I2C Address Input. Inputs A0, A1, and A2 determine the I2C slave address of the device.
12 I/O_5 Input/Output 5. Bidirectional I/O pin.
13 I/O_6 Input/Output 6. Bidirectional I/O pin.
14 I/O_7 Input/Output 7. Bidirectional I/O pin.
15 I/O_8 Input/Output 8. Bidirectional I/O pin.
16 GND Ground
Block Diagram
SDA
SCL
A0
A1
A2
VCC
VCC
I2C
INTERFACE
GND
EEPROM
64 BYTES
USER MEMORY
[00h TO 3Fh]
DS4520
I/O CONTROL
REGISTERS
PULLUP ENABLE (F0h-F1h)
I/O CONTROL (F2h-F3h)
I/O STATUS (F8h-F9h)
I/O CELL (x9)
VCC
RPU
I/O_n
[n = 0 TO 8]
_____________________________________________________________________ 5
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