iC-WE
3-CHANNEL 75
Ω
LINE DRIVER
Rev D1, Page 1/10
FEATURES
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3 current-limited and short-circuit-proof push-pull drivers
Built-in adaption to 75
Ω
characteristic impedance
High driver current of 300 mA at 24 V typ.
Low saturation voltage up to 30 mA load current
Short switching times and high slew rates by npn circuitry
Wide driver supply range VB = 4.5 V to 30 V
Internal free-wheeling diodes to VB and GND
Schmitt trigger inputs with integrated pull-up current sources
Inputs compatible to TTL and CMOS
Inverting and non-inverting driver mode
Bus capability due to Tri-State switching
Compatible to EIA standard RS-422
Thermal shutdown with hysteresis
Short-circuit-proof OC error output reports thermal shutdown
or undervoltage at VCC or VB
Driver disabled in case of fault
extended temperature range of up to 130 °C in
TSSOP20tp 4.4 mm package
APPLICATIONS
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24 V signal transfer
Line driver in PLC environment
PACKAGES
SO20
TSSOP20
thermal pad
SO16W
BLOCK DIAGRAM
2
VCC
10
TNER
VB
NER
3
12
MODE
ERROR
8
9
TRI
INV
LOW VOLTAGE
T.SHUTDOWN
SO20
1
E1
iC-WE
A1
11
CHAN 1
20
E2
A2
13
CHAN 2
19
E3
A3
18
CHAN 3
GND
4-7,14-17
Copyright © 2003, iC-Haus
www.ichaus.com
iC-WE
3-CHANNEL 75
Ω
LINE DRIVER
Rev D1, Page 2/10
DESCRIPTION
The iC-WE is a high-speed monolithic line driver circuit for three independent channels with built-in
characteristic impedance adaption for 75Ω lines. The push-pull outputs are designed for a high driver power
of typ. 300mA at 24V. They are current-limited and short-circuit protected by thermal shut-down at over-
temperature. Clamp diodes to VB and to GND protect the IC outputs against echoes of mismatched lines and
against damage due to ESD according to MIL-STD-883.
All inputs are Schmitt triggers and contain current sources from the 5V supply VCC which select a defined
High Level without external wiring. Clamp diodes to VCC and to GND furnish ESD protection.
Using the INVert input it is possible to switch all channels to inverting or non-inverting operation. This enables
a data transmission with balanced line activation using two iC-WE devices. For bus applications the final
stages can be forced to a high impedance state using the TRI-State input.
The circuit monitors supply voltages VB and VCC as well as the chip temperature and switches all final stages
to high impedance in the event of a fault. The NER output which is constructed as an open collector and is
also short-circuit proof reports the fault via the connected line. The error input TNER can be linked to message
outputs of other ICs and allows iC-WE to report a system fault message. If the supply voltage VCC cancels,
NER becomes highly resistive.
PACKAGES
SO20, SO16W, TSSOP20 to JEDEC Standard
PIN CONFIGURATION,
top view
(scale 2:1)
SO20
SO16W
(low power applications only)
TSSOP20tp 4.4 mm
PIN FUNCTIONS
Name
Function
VCC
E1
E2
E3
TRI
INV
TNER
+5 V (± 10 %) Input Supply Voltage
Channel 1 Input
Channel 2 Input
Channel 3 Input
Tristate Input, high active
Invert Mode Input, high active
Error Input
Name
VB
A1
A2
A3
NER
GND
Function
+4.5..+30 V Driver Supply Voltage
Channel 1 Output
Channel 2 Output
Channel 3 Output
Error Output, low active
Ground
To enhance heat removal, the TSSOP20 package offers a large area pad to be soldered (a connection is
only permitted to GND).
iC-WE
3-CHANNEL 75
Ω
LINE DRIVER
Rev D1, Page 3/10
ABSOLUTE MAXIMUM RATINGS
Values beyond which damage may occur; device operation is not guaranteed.
Item
Symbol
Parameter
Supply Voltage
Driver Supply Voltage
Output Current in A1..3
Input Current in E1..3, INV, TRI, TNER
Voltage at NER
Current in NER
ESD Susceptibility
at all pins
Operating Junction Temperature
Storage Temperature Range
MIL-STD-883, Method 3015, HBM
100 pF discharged through 1.5 kΩ
-40
-40
Conditions
Fig.
Min.
G001 VCC
G002 VB
G003 I(A)
G004 I(E)
G005 V(NER)
G006 I(NER)
E001 Vd()
TG1 Tj
TG2 Ts
0
0
-800
-4
Max.
7
32
800
4
32
25
2
165
150
V
V
mA
mA
V
mA
kV
°C
°C
Unit
THERMAL DATA
Operating Conditions: VB = 4.5..30 V, VCC = 5 V ± 10 %
Item
T1
Symbol
Ta
Parameter
Conditions
Fig.
Min.
Operating Ambient Temperature
iC-WE SO16W
Range
iC-WE SO20, iC-WE TSSOP20
(extended range to -40 °C on request)
Thermal Resistance SO20
Chip to Ambient
Thermal Resistance SO16W
Chip to Ambient
Thermal Resistance TSSOP20
Chip to Ambient
surface mounted with ca. 2 cm
2
heat
sink at leads (see Demo Board)
surface mounted with ca. 2 cm
2
heat
sink at leads
surface mounted, thermal pad
soldered to ca. 2 cm
2
heat sink
-25
-25
35
55
30
Typ.
Max.
125
130
45
75
40
°C
°C
K/W
K/W
K/W
Unit
T2
T3
T4
Rthja
Rthja
Rthja
All voltages are referenced to ground unless otherwise noted.
All currents into the device pins are positive; all currents out of the device pins are negative.
iC-WE
3-CHANNEL 75
Ω
LINE DRIVER
Rev D1, Page 4/10
ELECTRICAL CHARACTERISTICS
Operating Conditions:
VB = 4.5..30 V, VCC = 5 V ± 10 %, Tj = -40..125 °C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
°C
Total Device
001 VCC
002 I(VCC)
Permissible Supply Voltage
Range
Supply Current in VCC
-40
27
80
125
4.5
8
8
8
8
4.5
A1..3 = lo
-40
27
80
125
-40
27
80
125
-40
-40
27
80
125
-40
27
80
125
-40
27
80
125
-40
27
80
125
-800
300
40
-500
500
75
250
1500
-50
0.4
-1.5
50
1.5
-0.4
40
30
Vhys = Vt()hi - Vt()lo
35
110
8
6
5
4
7
6
4
3
16
14
12
11
11
9
7
5
15
14
13
12
5.5
24
23
21
19
30
24
21
18
15
14
12
10
8
1.2
1.4
1.15
1.05
1.05
1.0
1.55
1.5
1.5
1.4
1.1
1.0
1.0
0.9
1.45
1.4
1.4
1.3
-300
800
100
V
mA
mA
mA
mA
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mA
mA
Ω
V/µs
V/µs
µA
V
V
%VCC
%VCC
mV
Fig.
Min.
Typ.
Max.
Unit
003 VB
004 I(VB)lo
Permissible Driver Supply Voltage
Range
Supply Current in VB
005 I(VB)hi
Supply Current in VB
A1..3 = hi, I(A1..3) = 0
006 I(VB)Tri
Supply Current in VB,
Outputs Tri-State
Saturation Voltage lo
TRI = hi,
V(A1..3) = -0.3..VB + 0.3 V
I(A) = 10 mA
Driver Outputs A1..3
101 Vs()lo
102 Vs()lo
Saturation Voltage lo
I(A) = 30 mA
103 Vs()hi
Saturation Voltage hi
Vs()hi = VB - V(A),
I(A) = -10 mA
104 Vs()hi
Saturation Voltage hi
Vs()hi = VB - V(A),
I(A) = -30 mA
105 Isc()hi
106 Isc()lo
107 Rout()
108 SR()hi
109 SR()lo
110 I0()
111 Vc()hi
112 Vc()lo
Inputs E1..3
201 Vt()hi
202 Vt()lo
203 Vt()hys
Short-Circuit Current hi
Short-Circuit Current lo
Output Impedance
Slew-Rate hi
Slew-Rate lo
Off-State Current
Clamp Voltage hi
Clamp Voltage lo
Threshold Voltage hi
Threshold Voltage lo
Input Hysteresis
VB = 30 V, V(A) = 0
VB = 30 V, V(A) = VB
VB = 30 V, V(A) = 15 V
VB = 30 V, CL = 100 pF
VB = 30 V, CL = 100 pF
TRI = hi, V(A) = 0..VB
Vc()hi = V(A) - VB,
TRI = hi, I(A) = 100 mA
TRI = hi, I(A) = -100 mA
iC-WE
3-CHANNEL 75
Ω
LINE DRIVER
Rev D1, Page 5/10
ELECTRICAL CHARACTERISTICS
Operating Conditions:
VB = 4.5..30 V, VCC = 5 V ± 10 %, Tj = -40..125 °C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
°C
Inputs E1..3 (continued)
204 Ipu()
205 Vc()hi
206 Vc()lo
207 tp(E-A)
Pull-Up Current
Clamp Voltage hi
Clamp Voltage lo
Propagation Delay E6 A
80
125
208
∆tp()INV
Delay Skew E6 A for
INV = lo vs. INV = hi
Error Detection
301 VCCon
302 VCCoff
303 VCChys
304 VBon
305 VBoff
306 VBhys
307 VCC
Turn-on Threshold VCC
Undervoltage Threshold at VCC
Hysteresis
Turn-on Threshold VB
-40
Undervoltage Threshold at VB
Hysteresis
Supply Voltage VCC for NER
Operation
I(NER) = 5 mA
V(NER) = 0..30 V
V(NER) = 0..30 V,
NER = off or VCC < 0.3 V
150
decreasing temperature
Thys = Toff - Ton
125
20
40
30
Vt()hys = Vt()hi - Vt()lo
V() = 0..VCC - 0.8 V
Vc()hi = V() - VCC, I() = 4 mA
I() = -4 mA
RL(A) = 1 kΩ,
RL(VCC,A) = 1 kΩ
40
35
0.4
-1.25
90
100
250
1.25
-0.4
5
5
5
5
decreasing Supply VB
Vbhys = Vbon - VBoff
decreasing Supply VCC
VCChys = VCCon - VCCoff
4.0
3.8
130
4.0
4.0
3.8
130
2.6
5.5
0.7
30
10
175
160
4.49
4.6
4.35
4.49
4.30
V
V
mV
V
V
V
mV
V
V
mA
µA
°C
°C
°C
%VCC
%VCC
mV
µA
V
V
µs
µs
µs
25
V(E) = 0..VCC - 1 V
Vc(E)hi = V(E) - VCC, I(E) = 4 mA
I(E) = -4 mA
40
0.4
-1.25
200
280
1.25
-0.4
300
330
330
150
µA
V
V
ns
ns
ns
ns
Fig.
Min.
Typ.
Max.
Unit
308 Vs(NER) Saturation Voltage lo at NER
309 Isc(NER) Short-Circuit Current lo in NER
310 I0(NER)
311 Toff
312 Ton
313 Thys
401 Vt()hi
402 Vt()lo
403 Vt()hys
404 Ipu()
405 Vc()hi
406 Vc()lo
407 tpz
(TRI-A)
Collector Off-State
Current in NER
Thermal Shutdown Threshold
Thermal Lock-on Threshold
Thermal Shutdown Hysteresis
Threshold Voltage hi
Threshold Voltage lo
Input Hysteresis
Pull-Up Current
Clamp Voltage hi
Clamp Voltage lo
Propagation Delay TRI
6
A
(A: lo,hi
6
Tri-State)
Mode Select INV, TRI, TNER
408 tp(INV-A) Propagation Delay INV
6
A
409 tp(TNER- Propagation Delay TNER
6
NER
NER)
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