19-3789; Rev 0; 8/05
+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
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.
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
ON
♦
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
Ordering Information
PART
MAX4822ETP
MAX4823ETP
MAX4824ETP
MAX4825ETP
TEMP RANGE
PIN-
PACKAGE
PACKAGE
CODE
T2044-3
T2044-3
T2044-3
T2044-3
-40°C to +85°C 20 TQFN-EP*
-40°C to +85°C 20 TQFN-EP*
-40°C to +85°C 20 TQFN-EP*
-40°C to +85°C 20 TQFN-EP*
*For
maximum heat dissipation, packages have an exposed
pad (EP) on the bottom. Solder exposed pad to GND.
Applications
ATE Equipment
DSL Redundancy Protection (ADSL/VDSL/HDSL)
T1/E1 Redundancy Protection
T3/E3 Redundancy Protection
Industrial Equipment
Test Equipment (Oscilloscopes, Spectrum
Analyzers)
SPI is a trademark of Motorola, Inc.
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
PART
MAX4822
MAX4823
MAX4824
MAX4825
Serial
Serial
Parallel
Parallel
Selector Guide
INTERFACE
POWER SAVE
Yes
No
Yes
No
Pin Configurations appear at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
MAX4822–MAX4825
ABSOLUTE MAXIMUM RATINGS
V
CC
........................................................................-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 (V
CC
+ 0.3V)
PSAVE ........................................................-0.3V to (V
CC
+ 0.3V)
Continuous OUT_ Current (all outputs turned on) ............150mA
Continuous OUT_ Current (single output turned on) ........300mA
Continuous Power Dissipation (T
A
= +70°C)
20-Lead Thin QFN (derate 16.9mW/°C above +70°C) ..1350mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (10s) ...........................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 2.7V, T
A
= +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
Operating Voltage
Quiescent Current
Dynamic Supply Current
Thermal Shutdown
Power-On Reset
Power-On Reset Hysteresis
DIGITAL INPUTS (SCLK, DIN,
CS,
LVL, A0, A1, A2,
RESET, SET)
Input Logic-High Voltage
Input Logic-Low Voltage
Input Logic Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUT (DOUT)
DOUT Low Voltage
DOUT High Voltage
V
OL
V
OH
I
SINK
= 6mA
I
SOURCE
= 0.5mA
V
CC
-
0.5
0.4
V
V
V
IH
V
IL
V
HYST
I
LEAK
C
IN
Input voltages = 0 or 5.5V
-1.0
V
CC
= 2.7V to 3.6V
V
CC
= 4.2V to 5.5V
V
CC
= 2.7V to 3.6V
V
CC
= 4.2V to 5.5V
150
+0.01
5
+1.0
2.0
2.4
0.6
0.8
V
V
mV
µA
pF
SYMBOL
V
CC
I
CC
I
D
I
OUT_
= 0,
logic inputs = 0 or V
CC
f
SCLK
=10MHz, C
DOUT
= 50pF
V
CC
= 3.6V
V
CC
= 5.5V
V
CC
= 3.6V
V
CC
= 5.5V
CONDITIONS
MIN
2.3
160
180
1.2
1.6
+130
+150
0.6
1.2
140
2.0
TYP
MAX
5.5
300
300
UNITS
V
µA
mA
°C
V
mV
Power-save disable threshold (Note 2)
Output disable threshold (Note 3)
Transform from high voltage to low voltage
2
_______________________________________________________________________________________
+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 2.7V, T
A
= +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
0.65 x
V
CC
0.55 x
V
CC
0.45 x
V
CC
0.35 x
V
CC
0.25 x
V
CC
0.15 x
V
CC
0.05 x
V
CC
0.35 x
V
CC
-1
7.0
9
TYP
0.7 x
.
V
CC
0.6 x
V
CC
0.5 x
V
CC
0.4 x
V
CC
0.3 x
V
CC
0.2 x
V
CC
0.1
.
x
V
CC
0.4 x
V
CC
2.7
MAX
0.75 x
V
CC
0.65 x
V
CC
0.55 x
V
CC
0.45 x
V
CC
0.35 x
V
CC
0.25 x
V
CC
0.15 x
V
CC
0.45 x
V
CC
5.0
+1
10.5
V
Ω
µA
V
V
UNITS
MAX4822–MAX4825
RELAY OUTPUT DRIVERS (OUT1–OUT8)
PS = 001
PS = 010
PS = 011
OUT_ Drive Voltage,
Power-Save On
(MAX4822)
V
OUTPS_
V
CC
= 2.7V
(Note 4)
PS = 100
PS = 101
PS = 110
PS = 111
OUT_ Drive Voltage,
Power-Save On (MAX4824)
OUT_ On-Resistance
OUT_ Off-Leakage Current
Zener Clamping Voltage
SPI TIMING (MAX4822/MAX4823)
Turn-On Time (OUT_)
Turn-Off Time (OUT_)
SCLK Frequency
Cycle Time
CS
Fall-to-SCLK Rise Setup
CS
Rise-to-SCLK Hold
SCLK High Time
SCLK Low Time
Data Setup Time
t
ON
t
OFF
f
SCLK
t
CH
+ t
CL
t
CSS
t
CSH
t
CH
t
CL
t
DS
From rising edge of
CS,
R
L
= 50Ω,
C
L
= 50pF
From rising edge of
CS,
R
L
= 50Ω,
C
L
= 50pF
0
100
50
50
40
40
20
1.0
3.0
10
µs
µs
MHz
ns
ns
ns
ns
ns
ns
V
OUTPS_
R
ON
I
LEAK
V
CLAMP
V
CC
= 2.7V (Note 4)
V
CC
= 2.7V, I
OUT_
= 70mA
V
OUT_
= V
CC
, all outputs off
I
OUT_
= 70mA (Note 5)
_______________________________________________________________________________________
3
+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
MAX4822–MAX4825
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 2.7V, T
A
= +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
Data Hold Time
SCLK Fall to DOUT Valid
Rise Time (DIN, SCLK,
CS, SET,
RESET)
Fall Time (DIN, SCLK,
CS,
RESET, SET)
RESET
Minimum Pulse Width
SET
Minimum Pulse Width
CS
Minimum Pulse Width
SYMBOL
t
DH
t
DO
t
SCR
t
SCF
t
RW
t
SW
t
CSW
From rising edge of
CS,
R
L
= 50Ω,
C
L
= 50pF
From rising edge of
CS,
R
L
= 50Ω,
C
L
= 50pF
20
0
20
0
20% of V
CC
to 70% of V
CC
, C
L
= 50pF
(Note 6)
20% of V
CC
to 70% of V
CC
, C
L
= 50pF
(Note 6)
70
70
40
Variation from typical value, C
L
= 100nF
(Note 7)
2
2
50% of SCLK to (V
IH
, V
IL
of D
IN
),
C
L
= 50pF
20% of V
CC
to 70% of V
CC
, C
L
= 50pF
(Note 6)
20% of V
CC
to 70% of V
CC
, C
L
= 50pF
(Note 6)
70
70
40
CONDITIONS
MIN
0
17
28
2
2
TYP
MAX
UNITS
ns
ns
µs
µs
ns
ns
ns
PARALLEL TIMING (MAX4824/MAX4825)
Turn-On Time
Turn-Off Time
LVL Setup Time
LVL Hold Time
Address to
CS
Setup Time
Address to
CS
Hold Time
Rise Time (A2, A1, A0, LVL)
Fall Time (A2, A1, A0, LVL)
RESET
Pulse Width
SET
Pulse Width
CS
Minimum Pulse Width
t
ON
t
OFF
t
LS
t
LH
t
AS
t
AH
t
SCR
t
SCF
t
RW
t
SW
t
CSW
1
3
µs
µs
ns
ns
ns
ns
µs
µs
ns
ns
ns
POWER-SAVE TIMING (MAX4822/MAX4824)
Power-Save Delay Time
Minimum PSAVE Low Time to
Power-Save Reset
t
PS
t
PSR
1.6
3.2
2
5.4
3.5
ms
ms
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Specifications at -40°C are guaranteed by design and not production tested.
Thermal shutdown disables power save from all channels to reduce power dissipation inside the device.
Thermal shutdown turns off all channels.
The circuit can set the output voltage in power-save mode only if I
OUT
x R
ON
< V
OUTP
.
After relay turn-off, inductive kickback can momentarily cause the OUT_ voltage to exceed V
CC
. This is considered part of
normal operation and does not damage the device.
Note 6:
Guaranteed by design.
Note 7:
For other capacitance values, use the equation t
PS
= 32 x C.
4
_______________________________________________________________________________________
+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
MAX4822–MAX4825
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4822-25 toc01
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4822-25 toc02
DYNAMIC SUPPLY CURRENT
vs. FREQUENCY
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
V
CC
= 3.6V
V
CC
= 5.5V
C
DOUT
= 50pF
MAX4822-25 toc03
180
ALL CHANNELS OFF
175
SUPPLY CURRENT (µA)
170
165
160
155
150
145
140
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
200
190
180
SUPPLY CURRENT (µA)
170
160
150
140
130
120
110
100
V
CC
= 2.3V
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 5.5V
2.00
DYNAMIC SUPPLY CURRENT (mA)
5.5
-40
-15
10
35
60
85
1
2
3
4
5
6
7
8
9
10
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY (MHz)
QUIESCENT SUPPLY CURRENT
vs. LOGIC-INPUT VOLTAGE
MAX4822-25 toc04
ON-RESISTANCE vs. SUPPLY VOLTAGE
MAX4822-25 toc05
ON-RESISTANCE vs. TEMPERATURE
I
OUT-SINK
= 70mA
3.5
V
CC
= 2.3V
V
CC
= 3.3V
MAX4822-25 toc06
1100
1000
900
SUPPLY CURRENT (µA)
800
700
600
500
400
300
200
100
0
0
1
2
3.50
I
OUT_SINK
= 70mA
3.25
3.00
R
ON
(Ω)
2.75
2.50
2.25
2.00
ALL LOGIC INPUTS
CONNECTED
4.0
V
CC
= 5.5V
R
ON
(Ω)
3.0
V
CC
= 3.3V
2.5
2.0
1.75
1.50
3
4
5
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
LOGIC-INPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
1.5
-40
-15
10
V
CC
= 5.0V
35
60
85
V
CC
= 5.5V
TEMPERATURE (°C)
POWER-ON RESET VOLTAGE
vs. TEMPERATURE
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
-40
-15
10
35
60
TEMPERATURE (°C)
MAX4822-25 toc07
OUTPUT OFF-LEAKAGE CURRENT
vs. SUPPLY VOLTAGE
MAX4822-25 toc08
OUTPUT OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4822-25 toc09
6
5
OUTPUT OFF-LEAKAGE (pA)
4
3
2
1
0
10
POWER-ON RESET VOLTAGE (V)
OUTPUT OFF-LEAKAGE (nA)
1
2.3V, 3.3V, 5.0V, AND 5.5V
0.1
0.01
0.001
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
85
_______________________________________________________________________________________
5
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