The DS4520 is a 9-bit nonvolatile (NV) I/O expander with
64 bytes of NV user memory controlled by an I
2
C-
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
♦
Programmable Replacement for Mechanical
Jumpers and Switches
♦
Nine NV Input/Output Pins
♦
64-Byte NV User Memory (EEPROM)
♦
I
2
C-Compatible Serial Interface
♦
Up to 8 Devices Can be Multidropped on the
Same I
2
C 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
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°C to +85°C
PIN-PACKAGE
16 TSSOP
Add “/T&R” 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
0.1μF
4.7kΩ
FROM
SYSTEM
CONTROLLER
4.7kΩ
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
______________________________________________
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.
9-Bit I
2
C Nonvolatile
I/O Expander Plus Memory
DS4520
ABSOLUTE MAXIMUM RATINGS
Voltage on V
CC
, SDA, and SCL Pins
Relative to Ground.............................................-0.5V to +6.0V
Voltage on A0, A1, A2, and I/O_n [n = 0 to 8]
Relative to Ground....-0.5V to (V
CC
+ 0.5V) not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +85°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature ...See IPC/JEDEC J-STD-020A Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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