MAX4821ETP+T【PDF 1/12 页】IC RELAY DRIVER 8CHAN 20-TQFN

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Sheet目录17382

[1页]2页 3页 4页 5页

AVAILAB

MAX4820/MAX4821

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

with Serial/Parallel Interface

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 2 Ω 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-

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 50 μ A (max) Quiescent Supply Current

? Space-Saving 20-Pin Thin QFN Package

Ordering Information

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

PART

MAX4820 ETP+

MAX4820EUP+

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

20 Thin QFN-EP*

20 TSSOP-EP*

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

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

MAX4821 ETP+ -40°C to +85°C 20 Thin QFN-EP*

MAX4821EUP+ -40°C to +85°C 20 TSSOP-EP*

Central Office

ATE

Diagrams

Functional Applications

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Pin Configurations

DSL, ADSL Line Cards

Industrial Equipment

E1/T1 Redundancy

TOP VIEW

RESET

OUT3

OUT4

Pin Configurations continued at end of data sheet.

Typical Application Circuits and Functional Diagrams

appear at end of data sheet.

DIN

SCLK

DOUT

*EP

MAX4820

COM

OUT5

OUT6

Pin Configurations appear at end of data sheet.

SPI and QSPI are continued end of Inc.

Functional Diagrams trademarks of Motorola, data sheet.

UCSP is a is of Maxim National Products, Inc.

MICROWIRE trademark trademark of Integrated Semiconductor Corp.

*CONNECT EP TO GND.

THIN QFN

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maxim integrated .com.

19-2751; Rev 2; 1/10

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