MAX4821 반도체 회로 부품 판매점
+3.3V/+5V / 8-Channel / Cascadable Relay Drivers with Serial/Parallel Interface
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 Maxim Integrated |
19-2751; Rev 0; 1/03
+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 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
Pin Configurations continued at end of data sheet.
Typical Application Circuits and Functional Diagrams
appear at end of data sheet.
Features
o 8 Independent Output Channels
o Built-In Inductive Kickback Protection
o Drive +3V and +5V Relays
o Guaranteed 70mA (min) Coil Drive Current
o SET Function to Turn On All Outputs
Simultaneously
o RESET Function to Turn Off All Outputs
Simultaneously
o SPI-/QSPI-/MICROWIRE-Compatible Serial
Interface (MAX4820)
o Serial Digital Output for Daisy Chaining
(MAX4820)
o Parallel Interface (MAX4821)
o Low 50µA (max) Quiescent Supply Current
o Space-Saving 20-Pin Thin QFN Package
Ordering Information
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
*For maximum heat dissipation, packages have an exposed pad
(EP) on the bottom. Solder exposed pad to GND.
Pin Configurations
TOP VIEW
RESET
CS
DIN
SCLK
DOUT
1
2
3
4
5
MAX4820
15 OUT3
14 OUT4
13 COM
12 OUT5
11 OUT6
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
THIN QFN
________________________________________________________________ Maxim Integrated Products 1
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, Cascadable Relay Drivers
with Serial/Parallel Interface
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
VCC, COM..............................................................-0.3V to +6.0V
OUT_........................................................-0.3V to (VCOM + 0.3V)
CS, SCLK, DIN, SET, RESET, A0, A1, A2, LVL......-0.3V to +6.0V
DOUT..........................................................-0.3V to (VCC + 0.3V)
Continuous OUT_ Current (all outputs turned on) ............150mA
Continuous OUT_ Current (single output turned on) ........300mA
Continuous Power Dissipation (TA = +70°C)
20-Lead Thin QFN
(derate 16.9mW/°C above +70°C) .................................1350mW
θJA .........................................................................59.3°C/W
20-Pin TSSOP
(derate 21.7mW/°C above +70°C) .................................1739mW
θJA ............................................................................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
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
(VCC = +3V to +5.5V, VCOM = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Operating Voltage
VCC
Quiescent Current
IQ
IOUT_ = 0,
VCC = 3.6V
logic inputs = 0 or VCC VCC = 5.5V
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
VIH
VIL
VHYST
VCC = 3.3V
VCC = 5V
VCC = 3.3V
VCC = 5V
Input Leakage Currents
CIN Input Capacitance
ILEAK
CIN
Input voltages = 0 or 5.5V
DIGITAL OUTPUT (DOUT)
DOUT Low Voltage
DOUT High Voltage
VOL
VOH
ISINK = 6mA
ISOURCE = 0.5mA
RELAY OUTPUT DRIVERS (OUT1–OUT8)
OUT_ Drive Current
OUT_ On-Resistance
RON
VCC = 2.7V
VCC = 4.5V
VCC = 2.7V
OUT_ Voltage
VOUT_ VCC = 3.0V, IOUT_ = 70mA
IOUT Off-Leakage Current
ILEAK VOUT_ = VCC, all outputs off
MIN TYP MAX UNITS
2.3 5.5 V
15 50
µA
20 70
160 °C
0.8 1.5 2.2
V
140 mV
2.0
2.4
0.6
0.8
150
-1.0 0.01 +1.0
5
V
V
mV
µA
pF
VCC - 0.5
0.4 V
V
70
mA
70
26 Ω
0.4 V
-1 +1 µA
Kickback Diode Forward Voltage VFORW IOUT_ = 150mA (Note 2)
1.5 V
2 _______________________________________________________________________________________
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MAX4821 driver
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