Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - ELCs Low side WFQFN 20

General Description

The MAX4822–MAX4825 8-channel relay drivers offer

built-in kickback protection and drive +3V/+5V non-

latching or dual-coil-latching relays. Each independent

open-drain output features a 2.7Ω (typ) on-resistance

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

These devices consume less than 300µA (max) quies-

cent current and have 1µA output off-leakage current.

A Zener-kickback-protection circuit significantly

reduces recovery time in applications where switching

speed is critical.

The MAX4822/MAX4824 feature a unique power-save

mode where the relay current, after activation, can be

reduced to a level just above the relay hold-current

threshold. This mode keeps the relay activated while

significantly reducing the power consumption.

The MAX4822/MAX4823 feature a 10MHz SPI™-/

QSPI™-/MICROWIRE™-compatible serial interface.

Input data is shifted into a shift register and latched to

the outputs when CS transitions from low to high. Each

data bit in the shift register corresponds to a specific

output, allowing independent control of all outputs.

The MAX4824/MAX4825 feature a 4-bit parallel-input

interface. The first 3 bits (A0, A1, A2) determine the out-

put address, and the fourth bit (LVL) determines whether

the selected output is switched on or off. Data is latched

to the outputs when CS transitions from low to high.

The MAX4822–MAX4825 feature separate set and reset

functions, allowing turn-on or turn-off of all outputs

simultaneously with a single control line. Built-in hys-

teresis (Schmidt trigger) on all digital inputs allows

these devices to be used with slow-rising and falling

signals, such as those from optocouplers or RC power-

up initialization circuits. The MAX4822–MAX4825 are

available in space-saving 4mm x 4mm, 20-pin thin QFN

packages. They are specified over the -40°C to +85°C

extended temperature range.

Applications

ATE Equipment

DSL Redundancy Protection (ADSL/VDSL/HDSL)

T1/E1 Redundancy Protection

T3/E3 Redundancy Protection

Industrial Equipment

Test Equipment (Oscilloscopes, Spectrum

Analyzers)

Features

♦ Built-In Zener Kickback Protection for Fast

Recovery

♦ Programmable Power-Save Mode Reduces Relay

Power Consumption (MAX4822/MAX4824)

♦ 10MHz SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface

♦ Eight Independent Output Channels

♦ Drive +3V and +5V Relays

♦ Guaranteed 70mA (min) Coil Drive Current

♦ Guaranteed 5Ω (max) R

♦ SET / RESET Functions to Turn On/Off All

Outputs Simultaneously

♦ Serial Digital Output for Daisy Chaining

♦ Optional Parallel Interface (MAX4824/MAX4825)

♦ Low 300µA (max) Quiescent Supply Current

♦ Space-Saving, 4mm x 4mm, 20-Pin TQFN Package

MAX4822–MAX4825

+3.3V/+5V, 8-Channel Relay Drivers with Fast

Recovery Time and Power-Save Mode

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3789; Rev 0; 8/05

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.

PART

TEMP RANGE

PIN-

PACKAGE

CODE

MAX4822ETP

-40°C to +85°C 20 TQFN-EP*

T2044-3

MAX4823ETP

-40°C to +85°C 20 TQFN-EP*

T2044-3

MAX4824ETP

-40°C to +85°C 20 TQFN-EP*

T2044-3

MAX4825ETP

-40°C to +85°C 20 TQFN-EP*

T2044-3

*For maximum heat dissipation, packages have an exposed

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

Pin Configurations appear at end of data sheet.

SPI is a trademark of Motorola, Inc.

QSPI is a trademark of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

PART INTERFACE POWER SAVE

MAX4822 Serial Yes

MAX4823 Serial No

MAX4824 Parallel Yes

MAX4825 Parallel No

Selector Guide

Summary of content (19 pages)

PAGE 1
9-3789; Rev 0; 8/05 +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode Features The MAX4822–MAX4825 8-channel relay drivers offer built-in kickback protection and drive +3V/+5V nonlatching or dual-coil-latching relays. Each independent open-drain output features a 2.7Ω (typ) on-resistance and is guaranteed to sink 70mA (min) of load current. These devices consume less than 300µA (max) quiescent current and have 1µA output off-leakage current.
PAGE 2
MAX4822–MAX4825 +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode ABSOLUTE MAXIMUM RATINGS VCC ........................................................................-0.3V to +6.0V OUT_ ......................................................................-0.3V to +11V CS, SCLK, DIN, SET, RESET, A0, A1, A2, LVL......-0.3V to +6.0V DOUT..........................................................-0.3V to (VCC + 0.3V) PSAVE ........................................................
PAGE 3
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode (VCC = +2.7V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 2.7V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX PS = 001 0.65 x VCC 0.7 x . VCC 0.75 x VCC PS = 010 0.55 x VCC 0.6 x VCC 0.
PAGE 4
MAX4822–MAX4825 +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 2.7V, TA = +25°C, unless otherwise noted.
PAGE 5
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode 160 155 150 170 160 150 140 VCC = 3.3V 130 VCC = 2.3V 120 145 100 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 -15 10 35 0.60 1 2 3 3.25 3.00 RON (Ω) 600 500 300 6 7 8 9 10 ON-RESISTANCE vs. TEMPERATURE IOUT-SINK = 70mA 2.75 2.50 VCC = 3.3V 3.5 VCC = 2.3V 3.0 2.5 2.25 VCC = 3.3V 5 4.0 RON (Ω) VCC = 5.5V 4 FREQUENCY (MHz) IOUT_SINK = 70mA 800 MAX4822-25 toc03 0.80 85 60 3.
PAGE 6
Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C, unless otherwise noted.) INPUT-LOGIC THRESHOLD vs. SUPPLY VOLTAGE OUT_ TURN-OFF DELAY TIME vs. SUPPLY VOLTAGE 100 80 60 2.1 2.0 1200 1000 800 40 600 20 400 MAX4822-25 toc12 1400 IOFF DELAY TIME (ns) 120 1600 INPUT-LOGIC THRESHOLD (V) 140 MAX4822-25 toc11 MAX4822-25 toc10 OUT_ TURN-ON DELAY TIME vs. SUPPLY VOLTAGE ION DELAY TIME (ns) 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 1.0 2.
PAGE 7
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode PIN NAME FUNCTION MAX4822 MAX4823 1 1 RESET Reset Input. Drive RESET low to clear all latches and registers (all outputs are high impedance). RESET overrides all other inputs. If RESET and SET are pulled low at the same time, then RESET takes precedence. 2 2 CS Chip-Select Input. Drive CS low to select the device. When CS is low, data at DIN is clocked into the shift register on SCLK’s rising edge.
PAGE 8
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode MAX4822–MAX4825 MAX4822/MAX4823 Pin Description (continued) PIN NAME FUNCTION MAX4822 MAX4823 19 19 VCC Input Supply Voltage. Bypass VCC to GND with a 0.1µF capacitor. 20 20 SET Set Input. Drive SET low to set all latches and registers high (all outputs are low impedance). SET overrides all parallel and serial control inputs. RESET overrides SET under all conditions. EP EP EP Exposed Pad.
PAGE 9
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode PIN MAX4824 MAX4825 NAME FUNCTION 13 — PSAVE Power-Save Control. Connect a timing capacitor from PSAVE to ground. The capacitor value determines power-save timing as explained under the Applications Information section. PSAVE can also be driven externally to control power-save mode asynchronously. When PSAVE is asserted high, the current through the coils is reduced to 60% of the initial nominal current value.
PAGE 10
MAX4822–MAX4825 +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode ADDRESS [A7...A0] ACTIVE REGISTER 00h Output Control Register—OUTR 01h P o we r - S a ve C o n fig u r a tio n Re gist e r —P S Serial-Input Address Map D7 D6 D5 D4 D3 D2 D1 D0 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 MSB LSB Output Control Register—OUTR (Address = 00h) Note: Setting DN to logic 1 turns on output OUTN+1. Setting DN to logic 0, turns off OUTN+1.
PAGE 11
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode LSB A2 A1 A0 OUTPUT D7 D6 D5 D4 D3 D2 D1 D0 Low Low Low OUT1 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 Low Low High OUT2 Low High Low OUT3 Low High High OUT4 High Low Low OUT5 High Low High OUT6 High High Low OUT7 High High High OUT8 Note: Setting DN to logic 1 turns on output OUTN+1. Setting DN to logic 0 turns off output OUTN+1. Example: Setting the D2 = 1 turns OUT3 on.
PAGE 12
MAX4822–MAX4825 +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode CS SCLK DIN A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Figure 5. 3-Wire Serial-Interface Operation for MAX4822 level data to the parallel register and updates the state of the outputs. Address data entered after CS is pulled low is not reflected in the state of the outputs following the next low-to-high transition on CS (Figure 7).
PAGE 13
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode For example, if the desired t PS is 20ms, then the required capacitor value is 20 / 32 = 0.625µF. Power-Save Mode Accuracy The current through the relay is controlled by setting the voltage at OUT_ to a percentage of the VCC supply as specified under the Electrical Characteristics and in the register description.
PAGE 14
MAX4822–MAX4825 +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode VCC VCC 0.1µF VCC DIN DIN MAX4823 OUT1 SCLK SCLK CS GND DOUT DIN DOUT MAX4823 OUT1 SCLK OUT8 PGND SCLK MAX4823 OUT1 SCLK OUT8 GND CS 0.1µF VCC VCC DOUT DIN VCC 0.1µF SCLK CS PGND OUT8 GND PGND CS Figure 8. Daisy-Chain Configuration VCC VCC 0.1µF VCC DIN DIN DIN CS DOUT DIN MAX4822 OUT1 PSAVE OUT8 GND PGND 0.47µF SCLK CS OUT8 GND PGND DOUT MAX4822 OUT1 PSAVE SCLK 0.
PAGE 15
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode VCC 0.1µF VCC DIN DIN DOUT MAX4822 OUT1 PSAVE OUT8 VCC CS N GND PGND DIN MAX4822 OUT1 PSAVE SCLK SCLK CS OUT8 GND 0.1µF VCC VCC DOUT DIN VCC 0.1µF MAX4822–MAX4825 VCC DOUT MAX4822 OUT1 PSAVE SCLK CS PGND OUT8 GND PGND SCLK CS Figure 10.
PAGE 16
+3.
PAGE 17
+3.
PAGE 18
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode MAX4822–MAX4825 Pin Configurations SET VCC OUT1 OUT2 PGND 18 17 16 PGND 16 19 OUT2 17 20 OUT1 OUT3 14 OUT4 14 OUT4 13 PSAVE DIN 3 13 N.C. 4 12 OUT5 SCLK 4 12 OUT5 5 11 OUT6 DOUT 5 11 OUT6 10 PGND 9 8 OUT8 OUT7 7 6 N.C.
PAGE 19
+3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode 24L QFN THIN.EPS PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 1 2 PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 2 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.