Page 1
iC-HD7
VB
O1
NO1
GND
I1
DRIVER STAGES
iC-HD7
O2
NO2
O3
NO3
O4
NO4
I2
I3
I4
NEN
4.5..35 V
LINE
PLC
UNDERVOLTAGE &
OVERTEMPERATURE
QUAD DIFFERENTIAL LINE DRIVER
Rev A6, Page 1/8
FEATURES
♦ Complementary short-circuit-proof push-pull driver stages for
RS422 and 24 V applications up to 2MHz
♦ 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 200mA at 24V
♦ Output saturation of just 0.3V at 40mAdc
♦ Tristate function for bus applications with excessive
temperature shutdown
♦ TTL-/CMOS-compatible Schmitt trigger inputs,
voltage-proof to 40V
♦ 4.5 to 35 V single supply operation with low static power
dissipation
♦ Operating temperature from -25 to 125◦C (-40◦C is optional)
BLOCK DIAGRAM
APPLICATIONS
♦ Line drivers for 24 V control
engineering
♦ Linear scales and encoders
♦ Sensor systems
PACKAGES
SO16N
RoHS compliant
Copyright © 2014 iC-Haus http://www.ichaus.com
Page 2
iC-HD7
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
HD7
Code...
...yyww
I1
O1
NO1
nc
NO2
O2
I2
GND
VB
I4
O4
NO4
NEN
NO3
O3
I3
QUAD DIFFERENTIAL LINE DRIVER
DESCRIPTION
Rev A6, Page 2/8
iC-HD7 is a robust line driver for industrial 5 V and
24V applications with four complementary output
channels.
For signal lines with a characteristic impedance of
30 to 140Ω the integrated line adapter, optimized
to 75 Ω, minimizes ringing effects which arise when
there is no line termination.
At a supply of 24V the push-pull driver stages typically provide 200mA to discharge the line and also
have a low saturation voltage (of typically 200mV
with a 40mA low-side load). The outputs are current
limited and short-circuit-proof, shutting down with excessive temperature.
PACKAGING INFORMATION SO16N, TSSOP20
PIN CONFIGURATION SO16N
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
deactivatedbyapplying a voltage of greater than 12V
to input NEN.
The device contains internal ESD protection circuitry.
PIN FUNCTIONS
No. Name Function
1 I1 Input 1
2 O1 Driver Output 1
3 NO1 Inverted Driver Output 1
4 nc
5 NO2 Inverted Driver Output 2
6 O2 Driver Output 2
7 I2 Input 2
8 GND Ground
9 I3 Input 3
10 O3 Driver Output 3
11 NO3 Inverted Driver Output 3
12 NEN Function Input
(low signal enables driver outputs)
13 NO4 Inverted Driver Output 4
14 O4 Driver Output 4
15 I4 Input 4
16 VB +4.5 to +35 V Supply Voltage
Page 3
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A6, 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 Symbol Parameter Conditions Unit
No. Min. Max.
G001 VB Supply Voltage VB 0 40 V
G002 Vin() Voltageat Inputs I1...I4 0 VB V
G003 Vin() Voltageat Input NEN 0 VB V
G004 V() Voltageat 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 HBM, 100 pF discharged through 1.5kΩ 2 kV
G007 Tj Junction Temperature -40 150
G008 Ts Storage Temperature -40 150
◦
C
◦
C
THERMAL DATA
Item Symbol Parameter Conditions Unit
No. Min. Typ. Max.
T01 Ta OperatingAmbient Temperature
(extended range to -40◦C on request)
T02 Rthja Thermal Resistance Chip To Ambient SO16Nsurface mounted, no special heat sink 110 K/W
-25 125
◦
C
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.
Page 4
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A6, Page 4/8
ELECTRICAL CHARACTERISTICS
Operating Conditions: VB= 4.5...35V,Tj = -40...125◦C, unless otherwise noted
Item Symbol Parameter Conditions Unit
No. Min. Typ. Max.
TotalDevice
001 VB Permissible Supply Voltage 4.5 35 V
002 I(VB) Supply Current in VB NEN= lo, outputs not loaded 3.8 5.5 mA
003 I(VB)tri Tristate Current Consumption inVBNEN= hi 2.7 mA
004 Vc()lo Clamp Voltage lo at
NEN, Ix, NERR
005 Vc()hi Clamp Voltage hi at
NEN, Ix, NERR
006 Vc()lo Clamp Voltage lo at
O1..O4, NO1..NO4
007 Vc()hi Clamp Voltage hi at
O1..O4, NO1..NO4
Driver Outputs Ox, NOx (x = 1...4)
101 Vs()lo Saturation Voltage lo I()= 40mA 0.2 0.6 V
102 Vs()hi Saturation Voltage hi Vs()hi= VB - V(); I()= -40mA 0.3 0.7 V
103 Iout()lo Driving Capability lo VB= 30V, V()= 3V 40 60 90 mA
104 Iout()hi Driving Capability hi VB= 30V, V()= VB − 3 V -90 -60 -40 mA
105 Isc()lo Short-Circuit Current lo VB= 30V, V()= VB 500 mA
106 Isc()hi Short-Circuit Current hi V()= 0V -500 mA
107 Rout() Output Resistance VB= 10...30V,V() = VB/2 50 75 110 Ω
108 SR()lo, hi Slew-Rate lo/hi VB= 24V,CL = 100pF 400 V/µs
109 tp()lo, hi In/Out Propagation Delay lo/hi 75 200 ns
110 dtp() Delay Skew output Ox vs. NOx -35 35 ns
111 Ilk() Output Leakage Current NEN= hi -10 10 uA
Driver Inputs Ix (x=1...4)
Functional input voltage range V(Ix) = 0 to 7.5V
201 Vt()lo Threshold Voltage lo 0.8 V
202 Vt()hi Threshold Voltage hi 2.4 V
203 Vt()hys Input Hysteresis 0.1 0.2 V
204 I() Input Leakage Current 0V < V() < 4.5V -5 5 µA
Function Input NEN
301 Vt1()lo Threshold Voltagelo Driver enabled for
302 Vt1()hi Threshold Voltagehi 2.4 V
303 Vt1()hys Input Hysteresis 0.1 0.2 V
304 Vt2()hi Threshold Voltagehi Driver enabled without thermal shutdown func-
305 Vt2()hys Input Hysteresis 0.5 V
306 Iin() InputCurrent 5V < V(NEN) < VB 100 400 µA
307 Iin() InputCurrent 0V < V(NEN) < 5V -5 5 µA
Undervoltage Monitoring
501 Voff Undervoltage Threshold lo 3.0 3.5 V
502 Von Undervoltage Threshold hi 3.6 4.1 V
503 Vhys Undervoltage Hysteresis 35 100 mV
504 tp()shut Undervoltage Lockout Delay 20 µs
I()= -1mA -1.2 -0.3 V
I()= 1mA VB +
0.3
VB= 0V,I() = -10mA -1.2 -0.3
VB= 0V,I() = 10mA VB +
0.3
0.8 V
V(NEN) < Vt1()lo
7.5 10 12 V
tion for V(NEN) > Vt2()hi
VB +
1.2
VB +
1.2
V
Page 5
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A6, Page 5/8
ELECTRICAL CHARACTERISTICS
Operating Conditions: VB= 4.5...35V,Tj = -40...125◦C, unless otherwise noted
Item Symbol Parameter Conditions Unit
No. Min. Typ. Max.
Temperature Monitoring
601 Toff Shutdown Temperature Thresh-
old
602 ∆Toff Temperature Hysteresis NEN= lo 8
NEN= lo 130 150 170
ELECTRICAL CHARACTERISTICS: Diagrams
◦
◦
C
C
Figure 1: Example of moderate slew rate with un-
loadad Ox and NOx outputs (VB= 24V)
Figure 2: Example of typical line end signal with-
out termination (VB = 24V, length of cable
10m)
Page 6
iC-HD7
LINE
D
TS
V (24V)
supply
VB
O1
NO1
GND
I1
iC-HD7
C
ZD
capacitive crosstalk
internal
ESD diodes
to remaining circuitry
C
p
C
p
QUAD DIFFERENTIAL LINE DRIVER
APPLICATION NOTE
Rev A6, Page 6/8
Reverse polarity and circuit protection
For reverse polarity protection electronic circuitries are
usually powered via a diode D in the supply line. Under normal operating conditions, this diode will not affectfunction of the circuitry when the additional forward
voltage drop across the diode is accounted for.
If the supply voltage V
is suddenly reversed, a
supply
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 result in capacitor voltage exceeding maximum ratings, leading to malfunction or damage of the
iC-HD7 and associated parts. Therefore EMC protection will require additional circuitry when a reverse polarity diode is used.
Figure 3 shows the iC-HD7 with the diode D for reverse
polarity protection and additional protective devices TS
and ZD.
For over-voltage protection, the suppressor diode TS
absorbs transients on the supply line, injected externally into the cable. Clamp voltage of the diode
TS should be rated slightly above maximum specified
supply voltage. To protect the driver outputs against
fast transients, additional parallel capacitors Cpin the
range of about 1nF are recommended and should be
connected from each output to ground. Further overvoltage protection elements like damping chokes, transient suppressor diodes or varistors may be needed to
comply with application specific EMC directives.
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
Figure 3: Circuit schematic showing protective devices
D: reverse polarity protective diode; TS: bidirectional suppressor diode;
ZD: supply voltage limiting zener diode
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 VB
specified to be 30V, reverse voltage V
D then should be at least 60V. Current rating depends on total power consumption of the circuitry, but
of the diode
R,D
max
Page 7
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
Rev A6, Page 7/8
is usually below 1 amps. Therefore, typical 1 amps
rated rectifier diodes like 1N4002 (with V
through 1N4007 (with V
= 1000V) or equivalent
R,D
types (BA157 through BA159) can be used. At VB
R,D
= 100 V)
max
of 30V, neither the suppressor diode TS nor the Zener
diode ZD should draw substantial current. Therefore,
their breakdown voltage should be chosen to be some
voltshigher. 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 current of 1mA is stated as 32.4 V. Also, a zener diode
like a BZT03C36 rated for 36 V also shows a minimum
breakdown voltage of 32.4V,but measured at test current of 10 mA.
Figure 4: Using zener diode ZD to limit circuit supply voltage
iC-Haus expressly reserves the right to change its products and/or specifications. An info letter gives details as to any amendments and additions made to the
relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by
email.
Copying – even as an excerpt – is only permitted with iC-Haus’ approval in writing and precise reference to source.
iC-Haus does not warrant the accuracy, completeness or timeliness of the specification and does not assume liability for any errors or omissions in these
materials.
The data specified is intended solely for the purposeof 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.
iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade
mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
Page 8
iC-HD7
QUAD DIFFERENTIAL LINE DRIVER
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 Tel.: +49 (0) 61 35 - 92 92 - 0
Am Kuemmerling 18 Fax: +49 (0) 6135-9292-192
D-55294 Bodenheim Web: http://www.ichaus.com
GERMANY E-Mail: sales@ichaus.com
Rev A6, Page 8/8
Appointed local distributors: http://www.ichaus.com/sales_partners
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