Rainbow-electronics MAX4821 User Manual download pdf

General Description

The MAX4820/MAX4821 8-channel relay drivers offer

built-in kickback protection and drive +3.3V/+5V non-

latching or dual-coil-latching relays. These devices are

especially useful when driving +3V relays. Each inde-

pendent open-drain output features a 2Ω on-resistance

and is guaranteed to sink 70mA (min) of load current.

Both devices consume less than 50µA (max) quiescent

current and have 1µA output off-leakage current.

The MAX4820 features an SPI™-/QSPI™-/MICROWIRE™-

compatible serial interface. Input data is shifted into an 8-

bit shift register and latched to the outputs when CS

transitions from low to high. Each data bit in the shift reg-

ister corresponds to a specific output, allowing indepen-

dent control of all outputs.

The MAX4821 features a 4-bit (A0, A1, A2, LVL) paral-

lel-input interface. The first three bits (A0, A1, A2) deter-

mine the output address, and the fourth bit (LVL)

determines whether the selected output is switched on

or off. Data is latched to the outputs when CS transi-

tions from low to high.

Both devices feature separate set and reset functions

that allow the user to turn on or turn off all outputs simul-

taneously with a single control line. Built-in hysteresis

(Schmidt trigger) on all digital inputs allows this device

to be used with slow rising and falling signals, such as

those from optocouplers or RC power-up initialization

circuits. The MAX4820/MAX4821 are available in 20-pin

TSSOP and space-saving 20-pin thin QFN packages.

Applications

Central Office

ATE

DSL, ADSL Line Cards

Industrial Equipment

E1/T1 Redundancy

Features

♦ 8 Independent Output Channels

♦ Built-In Inductive Kickback Protection

♦ Drive +3V and +5V Relays

♦ Guaranteed 70mA (min) Coil Drive Current

♦ SET Function to Turn On All Outputs

Simultaneously

♦ RESET Function to Turn Off All Outputs

Simultaneously

♦ SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface (MAX4820)

♦ Serial Digital Output for Daisy Chaining

(MAX4820)

♦ Parallel Interface (MAX4821)

♦ Low 50µA (max) Quiescent Supply Current

♦ Space-Saving 20-Pin Thin QFN Package

MAX4820/MAX4821

+3.3V/+5V, 8-Channel, Cascadable Relay Drivers

with Serial/Parallel Interface

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

SET

OUT1

OUT2

16 PGND

OUT5

COM

OUT4

OUT3

OUT6

SCLK

DIN

RESET

5DOUT

N.C.

GND

OUT8

OUT7

10PGND

MAX4820

THIN QFN

Pin Configurations

Ordering Information

19-2751; Rev 0; 1/03

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.

*For maximum heat dissipation, packages have an exposed pad

(EP) on the bottom. Solder exposed pad to GND.

Pin Configurations continued at end of data sheet.

Typical Application Circuits and Functional Diagrams

appear at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

PART TEMP RANGE PIN-PACKAGE

MAX4820ETP* -40°C to +85°C 20 Thin QFN-EP

MAX4820EUP* -40°C to +85°C 20 TSSOP

MAX4821ETP* -40°C to +85°C 20 Thin QFN-EP

MAX4821EUP* -40°C to +85°C 20 TSSOP

1 2 3 4 5 6 ... 12 13

MAX4820/MAX4821 1

Summary of Contents

Page 1 - MAX4820/MAX4821

General DescriptionThe MAX4820/MAX4821 8-channel relay drivers offerbuilt-in kickback protection and drive +3.3V/+5V non-latching or dual-coil-latchin

Page 2

MAX4820/MAX4821+3.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface10 ________________________________________________________

Page 3

MAX4820/MAX48213.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface____________________________________________________________

Page 4

MAX4820/MAX4821+3.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface12 ________________________________________________________

Page 5

MAX4820/MAX48213.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel InterfaceMaxim cannot assume responsibility for use of any circuitry

Page 6

MAX4820/MAX4821+3.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface2 _________________________________________________________

Page 7

MAX4820/MAX48213.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface____________________________________________________________

Page 8

MAX4820/MAX4821+3.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface4 _________________________________________________________

Page 9

MAX4820/MAX48213.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface____________________________________________________________

Page 10

MAX4820/MAX4821+3.3V/+5V, 8-Channel, Cascadable Relay Driverswith Serial/Parallel Interface6 _________________________________________________________

Page 11

Digital InterfaceSerial Interface (MAX4820)The serial interface consists of an 8-bit shift registerand parallel latch controlled by SCLK and CS. Thein

Page 12

MAX4820/MAX4821SET/RESETFunctionsThe MAX4820/MAX4821 feature set and reset inputs thatallow the user to simultaneously turn all outputs on or offusing

Page 13

Inductive Kickback ProtectionThe MAX4820/MAX4821 feature built-in inductive kick-back protection to reduce the voltage spike on OUT_generated by a rel

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Rainbow-electronics MAX4821 User Manual

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Summary of Contents

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