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MAX4821EUP

P1-P3P4-P6P7-P9P10-P12P13-P13
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
20
19
18
17
SET
V
CC
OUT1
OUT2
16 PGND
13
12
11
14
15
OUT5
COM
OUT4
OUT3
OUT6
4
3
2
1
SCLK
DIN
CS
RESET
5DOUT
6
7
8
9
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
MAX4820/MAX4821
+3.3V/+5V, 8-Channel, Cascadable Relay Drivers
with Serial/Parallel Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3V to +5.5V, V
COM
= V
CC
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
(All voltages referenced to GND.)
V
CC
, COM..............................................................-0.3V to +6.0V
OUT_........................................................-0.3V to (V
COM
+ 0.3V)
CS, SCLK, DIN, SET, RESET, A0, A1, A2, LVL......-0.3V to +6.0V
DOUT..........................................................-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
θ
JA
.........................................................................59.3°C/W
20-Pin TSSOP
(derate 21.7mW/°C above +70°C).................................1739mW
θ
JA
............................................................................46°C/W
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage V
CC
2.3 5.5 V
V
CC
= 3.6V 15 50
Quiescent Current I
Q
I
OUT
_ = 0,
logic inputs = 0 or V
CC V
CC
= 5.5V 20 70
µA
Thermal Shutdown 160 °C
Power-On Reset 0.8 1.5 2.2 V
Power-On Reset Hysteresis 140 mV
DIGITAL INPUTS (SCLK, DIN, CS, LVL, A0, A1, A2, RESET, SET)
V
CC
= 3.3V 2.0
Input Logic High Voltage V
IH
V
CC
= 5V 2.4
V
V
CC
= 3.3V 0.6
Input Logic Low Voltage V
IL
V
CC
= 5V 0.8
V
Input Logic Hysteresis V
HYST
150 mV
Input Leakage Currents I
LEAK
Input voltages = 0 or 5.5V -1.0 0.01 +1.0 µA
C
IN
Input Capacitance C
IN
5pF
DIGITAL OUTPUT (DOUT)
DOUT Low Voltage V
OL
I
SINK
= 6mA 0.4 V
DOUT High Voltage V
OH
I
SOURCE
= 0.5mA V
CC
- 0.5 V
RELAY OUTPUT DRIVERS (OUT1–OUT8)
V
CC
= 2.7V 70
OUT_ Drive Current
V
CC
= 4.5V 70
mA
OUT_ On-Resistance R
ON
V
CC
= 2.7V 2 6 Ω
OUT_ Voltage V
OUT
_V
CC
= 3.0V, I
OUT
_ = 70mA 0.4 V
I
OUT
Off-Leakage Current I
LEAK
V
OUT
_ = V
CC
,
all outputs off -1 +1 µA
Kickback Diode Forward Voltage V
FORW
I
OUT
_ = 150mA (Note 2) 1.5 V
MAX4820/MAX4821
3.3V/+5V, 8-Channel, Cascadable Relay Drivers
with Serial/Parallel Interface
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPI TIMING (MAX4821)
Turn-On Time (OUT_) t
ON
From rising edge of CS, R
L
= 50Ω,
C
L
= 50pF
1.0 µs
Turn-Off Time (OUT_) t
OFF
From rising edge of CS, R
L
= 50Ω,
C
L
= 50pF
1.0 µs
SCLK Frequency f
SCLK
0 2.1 MHz
Cycle Time t
CH
+ t
CL
480 ns
CS Fall to SCLK Rise Setup t
CSS
240 ns
CS Rise to SCLK Hold t
CSH
240 ns
SCLK High Time t
CH
190 ns
SCLK Low Time t
CL
190 ns
Data Setup Time t
DS
100 ns
Data Hold Time t
DH
0ns
SCLK Fall to DOUT Valid t
DO
50% of SCLK to 10% of DOUT,
C
L
= 50pF
85 120 ns
Rise Time (DIN, SCLK, CS, SET,
RESET)
t
SCR
20% of V
CC
to 70% of V
CC
, C
L
= 50pF 2 µs
Fall Time (DIN, SCLK, CS,
RESET, SET)
t
SCF
20% of V
CC
to 70% of V
CC
, C
L
= 50pF 2 µs
RESET Min Pulse Width t
RW
70 ns
SET Min Pulse Width t
SW
70 ns
PARALLEL TIMING (MAX4820)
Turn-On Time t
ON
From rising edge of CS, R
L
= 50Ω,
C
L
= 50pF
1µs
Turn-Off Time t
OFF
From rising edge of CS, R
L
= 50Ω,
C
L
= 50pF
1µs
LVL Setup Time t
LS
100 ns
LVL Hold Time t
LH
0ns
Address to CS Setup Time t
AH
100 ns
Address to CS Hold Time t
AS
0ns
Rise Time (A2, A1, A0, LVL) t
SCR
20% of V
CC
to 70% of V
CC
, C
L
= 50pF 2 µs
Fall Time (A2, A1, A0, LVL) t
SCF
20% of V
CC
to 70% of V
CC
, C
L
= 50pF 2 µs
RESET Pulse Width t
RW
70 ns
SET Pulse Width t
SW
70 ns
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, V
COM
= V
CC
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: Specifications at -40°C are guaranteed by design and not production tested.
Note 2: After relay turn-off, inductive kickback may momentarily cause the voltage at OUT_ to exceed V
COM
. This is considered part
of normal operation and will not damage the device.
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX4821EUP

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IC RELAY DRIVER 8CH TSSOP
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