ICHAUS IC-HD7

iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 1/8
FEATURES
APPLICATIONS
♦ Complementary short-circuit-proof push-pull driver stages for
RS422 and 24 V applications up to 2 MHz
♦ Pin-compatible to 26LS31, xx7272
♦ Integrated line adaptation for high signal quality at 24 V
♦ Moderate slew rate reduces EMI
♦ High driving capability of typically 200 mA at 24 V
♦ Output saturation of just 0.3 V at 40 mAdc
♦ Tristate function for bus applications with excessive
temperature shutdown
♦ TTL-/CMOS-compatible Schmitt trigger inputs,
voltage-proof to 40 V
♦ 4.5 to 35 V single supply operation with low static power
dissipation
♦ Operating temperature from -25 to 125 °C (-40 °C is optional)
♦ Line drivers for 24 V control
engineering
♦ Linear scales and encoders
♦ Sensor systems
PACKAGES
SO16N
RoHS compliant
BLOCK DIAGRAM
4.5..35 V
iC-HD7
VB
UNDERVOLTAGE &
OVERTEMPERATURE
NEN
DRIVER STAGES
O1
LINE
NO1
I1
O2
I2
NO2
I3
O3
PLC
NO3
I4
O4
NO4
GND
Copyright © 2010 iC-Haus
http://www.ichaus.com
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 2/8
DESCRIPTION
iC-HD7 is a robust line driver for industrial 5 V and
24 V applications with four complementary output
channels.
For signal lines with a characteristic impedance of
30 to 140 Ω the integrated line adapter, optimized
to 75 Ω, minimizes ringing effects which arise when
there is no line termination.
At a supply of 24 V the push-pull driver stages typically provide 200 mA to discharge the line and also
have a low saturation voltage (of typically 200 mV
with a 40 mA low-side load). The outputs are current
limited and short-circuit-proof, shutting down with ex-
cessive temperature.
For bus applications the driver stages can be
switched to high impedance by a high at input NEN.
The driver stage inputs have a Schmitt trigger characteristic and are compatible with CMOS and TTL
levels.
For test purposes the temperature monitor can be
deactivated by applying a voltage of greater than 12 V
to input NEN.
The device contains internal ESD protection circuitry.
PACKAGES SO16N, TSSOP20
PIN FUNCTIONS
No. Name Function
PIN CONFIGURATION SO16N
1
16
2
15
VB
I1
NO1
4
nc
5
NO2
6
...yyww
3
HD7 Code...
O1
I4
14
O4
13
NO4
12
NEN
11
NO3
O2
7
10
O3
I2
8
GND
9
I3
1
2
3
4
5
6
7
8
9
10
11
12
I1
O1
NO1
nc
NO2
O2
I2
GND
I3
O3
NO3
NEN
13
14
15
16
NO4
O4
I4
VB
Input 1
Driver Output 1
Inverted Driver Output 1
Inverted Driver Output 2
Driver Output 2
Input 2
Ground
Input 3
Driver Output 3
Inverted Driver Output 3
Function Input
(low signal enables driver outputs)
Inverted Driver Output 4
Driver Output 4
Input 4
+4.5 to +35 V Supply Voltage
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 3/8
ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed. Absolute Maximum Ratings are no Operating Conditions.
Integrated circuits with system interfaces, e.g. via cable accessible pins (I/O pins, line drivers) are per principle endangered by injected
interferences, which may compromise the function or durability. The robustness of the devices has to be verified by the user during system
development with regards to applying standards and ensured where necessary by additional protective circuitry. By the manufacturer
suggested protective circuitry is for information only and given without responsibility and has to be verified within the actual system with
respect to actual interferences.
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Max.
G001 VB
Supply Voltage VB
0
40
V
G002 Vin()
Voltage at Inputs I1...I4
0
VB
V
G003 Vin()
Voltage at Input NEN
0
VB
V
G004 V()
Voltage at Outputs O1...O4, NO1...NO4
0
VB
V
G005 I()
Current in Outputs O1...O4, NO1...NO4
-500
500
mA
G006 Vd()
ESD Susceptibility at all pins
2
kV
G007 Tj
Junction Temperature
-40
150
°C
G008 Ts
Storage Temperature
-40
150
°C
HBM, 100 pF discharged through 1.5 kΩ
THERMAL DATA
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
T01
Ta
Operating Ambient Temperature
(extended range to -40°C on request)
T02
Rthja
Thermal Resistance Chip To Ambient
Typ.
-25
SO16N surface mounted, no special heat sink
All voltages are referenced to ground unless otherwise stated.
All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
Max.
125
110
°C
K/W
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 4/8
ELECTRICAL CHARACTERISTICS
Operating Conditions: VB = 4.5...35 V, Tj = -40...125 °C, unless otherwise noted
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Typ.
Max.
35
V
5.5
mA
Total Device
001
VB
Permissible Supply Voltage
002
I(VB)
Supply Current in VB
NEN = lo, outputs not loaded
4.5
3.8
003
I(VB)tri
Tristate Current Consumption in
VB
NEN = hi
2.7
004
Vc()lo
Clamp Voltage lo at
NEN, Ix, NERR
I() = -1 mA
-1.2
-0.3
V
005
Vc()hi
Clamp Voltage hi at
NEN, Ix, NERR
I() = 1 mA
VB +
0.3
VB +
1.2
V
006
Vc()lo
Clamp Voltage lo at
O1..O4, NO1..NO4
VB = 0 V, I() = -10 mA
-1.2
-0.3
007
Vc()hi
Clamp Voltage hi at
O1..O4, NO1..NO4
VB = 0 V, I() = 10 mA
VB +
0.3
VB +
1.2
mA
Driver Outputs Ox, NOx (x = 1...4)
101
Vs()lo
Saturation Voltage lo
I() = 40 mA
0.2
0.6
102
Vs()hi
Saturation Voltage hi
Vs()hi = VB - V(); I() = -40 mA
0.3
0.7
V
103
Iout()lo
Driving Capability lo
VB = 30 V, V() = 3 V
40
60
90
mA
104
Iout()hi
Driving Capability hi
VB = 30 V, V() = VB − 3 V
-90
-60
-40
mA
105
Isc()lo
Short-Circuit Current lo
VB = 30 V, V() = VB
500
mA
106
Isc()hi
Short-Circuit Current hi
V() = 0 V
107
Rout()
Output Resistance
VB = 10...30 V, V() = VB/2
108
SR()lo, hi
Slew-Rate lo/hi
VB = 24 V, CL = 100 pF
109
tp()lo, hi
In/Out Propagation Delay lo/hi
110
dtp()
Delay Skew
output Ox vs. NOx
-35
35
ns
111
Ilk()
Output Leakage Current
NEN = hi
-10
10
uA
-500
50
V
mA
75
110
400
75
Ω
V/µs
200
ns
Driver Inputs Ix (x=1...4)
Functional input voltage range V(Ix) = 0 to 7.5 V
201
Vt()lo
Threshold Voltage lo
202
Vt()hi
Threshold Voltage hi
203
Vt()hys
Input Hysteresis
204
I()
Input Leakage Current
0.8
V
2.4
0.1
0 V < V() < 4.5 V
-5
Driver enabled for
V(NEN) < Vt1()lo
0.8
0.2
V
V
5
µA
Function Input NEN
301
Vt1()lo
Threshold Voltage lo
302
Vt1()hi
Threshold Voltage hi
303
Vt1()hys
Input Hysteresis
304
Vt2()hi
Threshold Voltage hi
305
Vt2()hys
Input Hysteresis
306
Iin()
Input Current
5 V < V(NEN) < VB
307
Iin()
Input Current
0 V < V(NEN) < 5 V
V
2.4
Driver enabled without thermal shutdown function for V(NEN) > Vt2()hi
0.1
0.2
7.5
10
V
12
V
400
µA
5
µA
0.5
100
-5
V
V
Undervoltage Monitoring
501
Voff
Undervoltage Threshold lo
502
Von
Undervoltage Threshold hi
503
Vhys
Undervoltage Hysteresis
504
tp()shut
Undervoltage Lockout Delay
3.0
3.5
3.6
35
V
4.1
V
100
mV
20
µs
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 5/8
ELECTRICAL CHARACTERISTICS
Operating Conditions: VB = 4.5...35 V, Tj = -40...125 °C, unless otherwise noted
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Typ.
Max.
130
150
170
Temperature Monitoring
601
Toff
Shutdown Temperature Threshold
NEN = lo
602
∆Toff
Temperature Hysteresis
NEN = lo
8
°C
°C
ELECTRICAL CHARACTERISTICS: Diagrams
Figure 1: Example of moderate slew rate with unloadad Ox and NOx outputs (VB = 24 V)
Figure 2: Example of typical line end signal without termination (VB = 24 V, length of cable
10 m)
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 6/8
APPLICATION NOTE
Reverse polarity and circuit protection
For reverse polarity protection electronic circuitry are
usually powered via a diode D in the supply line. Under normal operating conditions, this diode will not affect function of the circuitry when the additional forward
voltage drop across the diode is accounted for operating voltage specification.
If the supply voltage Vsupply is suddenly reversed, a
load capacitor C may be still fully charged. Therefore,
the diode D has to be selected to withstand a voltage
difference of at least twice the maximum supply voltage.
Since the reverse polarity protection diode D prevents
discharging of the load capacitor C, especially at low
power consumption injected charge through disturbances may in general result in capacitor voltage exceeding maximum ratings, leading to malfunction or
destruction of circuitry and associated parts. Thus
EMC requirements will afford more external circuitry
due to the introduction of a reverse polarity diode.
Figure 3 shows the iC-HD7 with the diode D for reverse
polarity protection and additional protective devices TS
and ZD.
Figure 3: Circuit schematic showing protective devices
D: reverse polarity protective diode; TS: bidirectional suppressor diode;
ZD: supply voltage limiting zener diode
For over-voltage protection, the suppressor diode TS
absorbs transients on supply line injected externally
on the cable. Clamp voltage of the diode TS should
be rated slightly above maximum specified supply voltage.
Due to capacitive crosstalk between the wires in the
cable of the supply line, additional currents may be injected into the circuitry during transients via the driver
pins of iC-HD7 connected directly to the cable. These
currents can be passed to ground or to VB by the internal ESD diodes of the iC-HD7. Whereas negative
current injection will simply be drained off to ground,
positive current injection will charge capacitor C further to higher voltages.
By introducing an additional Zener diode ZD in parallel
to capacitor C, excessive charge can be drained off,
thus limiting circuitry supply voltage to a safe value, as
shown in fig. 4.
Suggested protective devices
As stated above, diode D must withstand at least twice
the maximum operating voltage. Assuming VBmax
specified to be 30V, reverse voltage VR,D of the diode
D then should be at least 60 V. Current rating depends on total power consumption of the circuitry, but
is usually below 1 amps. Therefore, typical 1 amps
rated rectifier diodes like 1N4002 (with VR,D = 100 V)
through 1N4007 (with VR,D = 1000 V) or equivalent
types (BA157 through BA159) can be used. At VBmax
of 30V, neither the suppressor diode TS nor the Zener
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 7/8
diode ZD should draw substantial current. Therefore,
their breakdown voltage should be chosen to be some
volts higher. A 36 V rated suppressor diode with 1.5kW
pulse power capability like a 1N6284 or 1.5KE36 the
minimum breakdown voltage measured at a test cur-
rent of 1 mA is stated as 32.4 V. Also, a zener diode
like a BZT03C36 rated for 36 V also shows a minimum
breakdown voltage of 32.4 V, but measured at test current of 10 mA.
Figure 4: Using zener diode ZD to limit circuit supply voltage
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in the materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of
merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which
information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or
areas of applications of the product.
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mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical
applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of
use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued
annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in
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We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations
of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can
be put to.
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 8/8
ORDERING INFORMATION
Type
Package
Order Designation
iC-HD7
SO16N
iC-HD7 SO16N
For technical support, information about prices and terms of delivery please contact:
iC-Haus GmbH
Am Kuemmerling 18
D-55294 Bodenheim
GERMANY
Tel.: +49 (61 35) 92 92-0
Fax: +49 (61 35) 92 92-192
Web: http://www.ichaus.com
E-Mail: [email protected]
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