ICHAUS ET7272

QUAD DIFFERENTIAL LINE DRIVER
WITH SEPARATE LOGIC BIAS AND DRIVER BIAS
SUPPLIES, AND ENABLE FUNCTION
ET7272
FEATURES
•
Supply Voltage Range 3.5V to 30V
•
Operation to 800KHz
•
CMOS and TTL Compatible Inputs
•
Separate logic bias and driver supply pins
•
Optional single supply operation for moderate
power applications
•
High Impedance Buffered Inputs with Hysteresis
may be driven directly by phototransistors
•
Tri-State outputs
•
80mA peak SINK/SOURCE current
•
Outputs Protected by Thermal Shut-Down
APPLICATIONS
•
Optical Encoders
•
Industrial Controls
DESCRIPTION
These line drivers are pin compatible with 26LS31 in applications where pin 4 = 5V and pin 12 = GND. Internal clamp
diodes allow trouble-free operation when driving cable lengths exceeding 100m. Split supplies are provided to
minimize standby power dissipation in high voltage applications. The logic should be powered from a regulated 5V
supply at the VccBias pin. The output stages may then be powered by a separate supply at VccDrivers, up to 30V.
Output voltage swings of 0.3V to VCC-1.9V are typical. The outputs are protected against shorts to ground, shorts to
Vcc and to other outputs, by a two-fold scheme of current limiting and thermal shutdown. This assures highly reliable
operation in harsh environments. Heat-sinking may be accomplished at pin 8 which is directly connected to the ASIC
substrate.
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating Temperature
Range
Supply Voltage Range(both)
Symbol
TA
VCC
Min.
-55
Max.
115
Units
°C
4.5
30
V
Ref.
ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT.
©2000, Rev A1
iC-Haus GmbH
Tel +49-6135-9292-0
Integrated Circuits
Fax +49-6135-9292-192
Am Kuemmerling 18, D-55294 Bodenheim
http://www.ichaus.com
Page 1 of 3
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, TA = 25°C and EN- <0.8V.
Parameters
Overtemp Operate Point (junction)1
Overtemp Release Point (junction)1
Vcc Bias Voltage Range
Vcc Drivers Voltage Range
Supply Current VccB1 (BIAS)
Supply Current VccD1 (DRIVERS)
Supply Current VccB2
Symbol
TJOP
TJRP
VccB
VccD
IccB1
ICCD1
IccB2
Supply Current VccD2
Min.
Typ.
172
136
5
5
11.9
2.4
2.5
Max.
30
30
16.0
3.3
3.4
Units
°C
°C
V
V
mA
mA
mA
ICCD2
0.0
0.1
mA
Supply Current VccB3
Supply Current VccD3
Supply Current VccB4
IccB3
ICCD3
IccB4
12.1
2.4
2.6
18.5
3.3
3.5
mA
mA
mA
Supply Current VccD4
ICCD4
0.0
0.1
mA
Enable Input Threshold
Enable Low Level Input Current
Enable High Level Input Current
High Impedance Output Leakage
VTHE
IILE
IIHE
IOZ
0.8
-10
-4.0
1.5
0
108
0.0
2
10
150
4.0
V
µA
µA
µA
Input Positive-Going Threshold
Input Negative-Going Threshold
Input Hysteresis
Low Level Input Current
High Level Input Current
Low Level Output1
Low Level Output2
High Level Output1
VT+
VTVH
IIL
IIH
VOL1
VOL2
VOH1
1.05
0.75
-
1.45
1.15
-4.0
4.0
500
500
2.4
1.25
0.95
0.3
-0.1
0
375
370
2.8
V
V
V
µA
µA
mV
mV
V
High Level Output2
VOH2
27.7
28.1
3.5
4.5
V
Test Conditions
VccB and VccD = 5V
VccB and VccD = 5V
VccB and VccD = 5V,
EN- > 2V
VccB and VccD = 5V,
EN- > 2V
VccB and VccD = 30V
VccB and VccD = 30V
VccB and VccD = 5V,
EN- > 2V
VccB and VccD = 5V,
EN- > 2V
VIN = 0V, VccB = 5V
VIN = 5V, VccB = 5V
VccD =30V, EN- > 2V,
Output at 15V
VccB = 5V
VccB = 5V
VccB = 5V
VIN = 0V, VccB = 5V
VIN = 5V, VccB = 5V
IOL = 20mA, VccD = 5V
IOL = 20mA, VccD =30V
IOH = -20mA, VccD =
5V
IOH = -20mA,
VccD=30V
ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT.
©2000, Rev A1
iC-Haus GmbH
Tel +49-6135-9292-0
Integrated Circuits
Fax +49-6135-9292-192
Am Kuemmerling 18, D-55294 Bodenheim
http://www.ichaus.com
Page 2 of 3
AC SWITCHING CHARACTERISTICS
Values given at VCCB = 5V, VCCD = 24V, TA = 25°C, CL = 1000pF on all outputs, and EN- <0.8V.
Parameters
Symbol
Propagation delay, rising input 50%
point to zero crossing of differential
outputs
Propagation delay, falling input 50%
point to zero crossing of differential
outputs
Output Rise Time
Output Fall Time
TPLH
Min.
Typ.
450
Max
.
630
Units
ns
TPHL
450
630
ns
TR
TF
700
700
980
980
ns
ns
Test Conditions
NOTES:
1. This is not a test parameter, but for information
only.
2. It may be necessary to clamp the outputs with
Schottky diodes when driving extemely long
cables with high capacitance between outputs.
These diodes should have a forward voltage of
less than 0.4V, and be connected with cathode to
the output and anode to ground.
PACKAGE
SUFFIX
Chip Only
16 Lead SOIC
-C
-SOP
ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT.
©2000, Rev A1
iC-Haus GmbH
Tel +49-6135-9292-0
Integrated Circuits
Fax +49-6135-9292-192
Am Kuemmerling 18, D-55294 Bodenheim
http://www.ichaus.com
Page 3 of 3