IXYS
Features:
•
•
•
•
•
•
•
•
8 Outputs Rated at 60V, 120mA
Open Drain Pull-Up Driver Configuration
6V to 60V Driver Supply Range
2.7V to 5.5V Logic Supply Range
3 Wire Serial Interface plus Chip Select
Captures Serial & Parallel Input Data
Outputs can be paralleled
28 Lead QFN Package
MX879
8-Channel, 60V Relay/Load Driver
Open Drain Output, 3 Wire Interface
General Description
The MX879 is an 8 channel high voltage switch with
8-bit parallel or serial input control. The MX879
connects directly to a microprocessor through a
standard 3 wire serial interface. The open drain pull-
up output configuration can drive up to 60 volts at
120mA. Outputs can be paralleled for increased
drive current up to a device total of 600mA source.
The MX879 is designed to operate over a
temperature range of -40°C to +85°C, and is
available in a QFN-28 Package.
Applications:
•
•
•
•
White Goods
ATE
Industrial Equipment
Automotive Relay Control
Ordering Information
Part No.
087900-00
087941-00
Description
QFN-28
QFN-28 Tape & Reel
Qty
73
2500
Functional Block Diagram
VCC
CS*
VPWR
SDO
IN7
IN6
IN5
IN4
IN3
IN2
IN1
IN 0
SCK
SDI
OE
GND
I/O
Register
Parallel Inputs
Shift Direction
Latch
Register
Parallel
In & Out
Driver
Level
Translator
OUT7
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
OUT0
MX879
Drawing No. 087909
1
06/08/06
www.claremicronix.com
MX879
Absolute Maximum Ratings
(Voltages with respect to GND=0V)
Parameter
VPWR Supply Voltage
Logic Supply Voltage
Input Pin Voltage
Continuous Output Current
Storage Temperature
Operating Ambient Temp
Operating Junction Temp
Thermal Resistance
(Junction to Ambient)
ESD Warning
Symbol
VPWR
VCC
V
IN
I
OUT
(O
UT
0-7)
T
STG
T
A
T
J
R
θJA
Min
Max
62
6
6
150
150
85
150
Unit
V
V
V
mA
C
o
C
o
C
o
C
o
/W
IXYS
Absolute Maximum Ratings are
stress ratings. Stresses in excess of
these ratings can cause permanent
damage to the device. Functional
operation of the device at these or
any other conditions beyond those
indicated in the operational sections
of this data sheet is not implied.
Exposure of the device to the
absolute maximum ratings for an
extended period may degrade the
device and affect its reliability.
-55
-40
110 Typical
ESD (electrostatic discharge) sensitive device. Although the MX879 features proprietary ESD protection circuitry,
permanent damage may be sustained if subjected to high energy electrostatic discharges. Proper ESD precautions
are recommended to avoid performance degradation or loss of functionality.
DC Electrical Characteristics
Parameter
Logic Supply Voltage
Logic Supply Current
Quiescent Logic Supply Current
VPWR Voltage
VPWR Current
Quiescent VPWR Current
High Level Input Voltage
Low Level Input Voltage
Input Leakage Current
SDO Tri-State Leakage Current
Out0-7 Current
Out0-7 ON Resistance
Out0-7 Tri-State Leakage Current
VCC=5.0V, VPWR=42V, T
A
=25
o
C, unless otherwise specified.
Condition
fSCK = 5 MHz
fSCK = 0
Min
2.7
Typ
50
Max
5.5
1
60
600
6
Total of all outputs
VPWR = 42V, No load
IN0-7, SCK, SDI, OE, CS
0.75
VCC-0.5
CS = Logic High
Any one output, source
VPWR = 42V
OE = Logic Low
0.5
1
1
120
7
1
Unit
V
µA
µA
V
mA
mA
V
V
µA
µA
mA
Ω
µA
Notes:
To avoid unwanted output during VPWR application and system initialization, keep OE at a logic
low until CS has completed one cycle.
Thermal Resistance is measured in still air with the device soldered to a 6 square inch board
without a ground plane. Applications may require derating of the specified maximum currents to
avoid exceeding the maximum operation junction temperature.
MX879
Drawing No. 087909
2
06/08/06
www.claremicronix.com
MX879
AC Electrical Characteristics
Parameter
SCK Period
1
SCK High Time
1
SCK Low Time
1
CS High Time
1
CS Falling to SCK Rising
1
CS Low Time
1
IN
X
to CS Falling (
SETUP TIME
)
1
IN
X
to CS Falling (
HOLD TIME
)
1
SDI to SCK Rising (
SETUP TIME
)
1
SDI to SCK Rising (
HOLD TIME
)
1
SCK Falling to SDO Data Valid
CS Rising to SDO High Z
CS Rising to OUT
X
Rising
OUT
X
Rise Time
OE Rising to OUT
X
Rising
OE Rising to OUT
X
Falling
OE Falling to OUT
X
High Z
Note 1: Guaranteed by design.
VCC=5.0V, VPWR=42V, T
A
=25
o
C, unless otherwise specified.
IXYS
Symbol
Condition
tCSwh
tCSs
tCSwl
tINs
tINh
tSDIs
tSDIh
tSDO
tSDOz
tOUTr
Min
100
40
40
50
150
150
15
30
20
25
Typ
Max Unit
DC
nS
nS
nS
nS
nS
nS
nS
nS
10
12
680
110
580
390
130
90
nS
nS
nS
nS
nS
nS
nS
nS
Setup Time
SCK Low, (parallel input mode)
To 50%, C(OUTx) = 1000pF
From 10% to 90%,
C(OUTx) = 1000pF
To 90%
To 90%
To 10%, OUTx High
To 10%, OUTx Low
MX879
Drawing No. 087909
3
06/08/06
www.claremicronix.com
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