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PDF HCPL4200 Data sheet ( Hoja de datos )
| Número de pieza | HCPL4200 | |
| Descripción | Optically Coupled 20 mA Current Loop Receiver | |
| Fabricantes | ETC | |
| Logotipo |  |
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Optically Coupled 20 mA
Current Loop Receiver
Technical Data
HCPL-4200
Features
• Data Output Compatible
with LSTTL, TTL and CMOS
• 20 K Baud Data Rate at 1400
Metres Line Length
• Guaranteed Performance
over Temperature (0°C to
70°C)
• Guaranteed On and Off
Thresholds
• LED is Protected from
Excess Current
• Input Threshold Hysteresis
• Three-State Output Compat-
ible with Data Buses
• Internal Shield for High
Common Mode Rejection
• Safety Approval
UL Recognized -2500 V rms,
for 1 Minute
CSA Approved
• Optically Coupled 20 mA
Current Loop Transmitter,
HCPL-4100, Also Available
Description
The HCPL-4200 optocoupler is
designed to operate as a receiver
in equipment using the 20 mA
Current Loop. 20 mA current
loop systems conventionally sig-
nal a logic high state by transmit-
ting 20 mA of loop current
(MARK), and signal a logic low
state by allowing no more than a
few milliamperes of loop current
(SPACE). Optical coupling of the
signal from the 20 mA current
loop to the logic output breaks
ground loops and provides for a
very high common mode
rejection. The HCPL-4200 aids in
the design process by providing
Functional Diagram
guaranteed thresholds for logic
high state and logic low state for
the current loop, providing an
LSTTL, TTL, or CMOS compatible
logic interface, and providing
guaranteed common mode
rejection. The buffer circuit on
the current loop side of the
HCPL-4200 provides typically 0.8
mA of hysteresis which increases
the immunity to common mode
and differential mode noise. The
buffer also provides a controlled
amount of LED drive current
which takes into account any
LED light output degradation.
The internal shield allows a
guaranteed 1000 V/µs common
mode transient immunity.
Applications
• Isolated 20 mA Current
• Loop Receiver in:
Computer Peripherals
Industrial Control Equipment
Data Communications
Equipment
A 0.1 µF bypass capacitor connected between pins 8 and 5 is recommended.
CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to
prevent damage and/or degradation which may be induced by ESD.
5965-3580E
1-323
1 page  
DC Electrical Specifications
For 0°C ≤TA ≤70°C, 4.5 V ≤VCC ≤20 V, VE = 0.8 V, all typicals at TA = 25°C and VCC = 5 V unless otherwise
noted. See note 13.
Parameter
Symbol
Mark State Input
Current
IMI
Mark State Input
Voltage
VMI
Space State Input
Current
ISI
Space State Input
Voltage
VSI
Input Hysteresis
Current
IHYS
Logic Low Output
Voltage
VOL
Logic High Output
Voltage
VOH
Output Leakage
IOHH
Current (VOUT > VCC)
Logic High Enable
Voltage
VEH
Logic Low Enable
Voltage
VEL
Logic High Enable
Current
IEH
Logic Low Enable
Current
Logic Low Supply
Current
Logic High Supply
Current
High Impedance
State Output
Current
IEL
ICCL
ICCH
IOZL
IOZH
Logic Low Short
Circuit Output
Current
IOSL
Min. Typ. Max. Units
1 2 mA
2.52 2.75 Volts
3 mA
1.6 2.2 Volts
0.3 0.8
mA
0.5 Volts
2.4 Volts
100 µA
500 µA
2.0 Volts
0.8 Volts
20
100
0.004 250
-0.32
µA
µA
µA
mA
4.5 6.0
5.25 7.5
2.7 4.5
3.1 6.0
-20
20
100
500
mA
mA
mA
mA
µA
µA
µA
µA
2 5 mA
4 0 mA
Test Conditions
Fig. Note
2, 3,
4
II = 20 mA VE = Don’t Care 4, 5
II = 0.5 to 2.0 mA
VE = Don’t
Care
2, 3,
4
2, 4
2
IOL = 6.4 mA II = 3 mA
(4 TTL Loads)
IOH = -2.6 mA, II = 12 mA
VO = 5.5 V II = 20 mA
VO = 20 V VCC = 4.5 V
6
7
VE = 2.7 V
VE = 5.5 V
VE = 20 V
VE = 0.4 V
VCC = 5.5 V
VCC = 20 V
VCC = 5.5 V
VCC = 20 V
VO = 0.4 V
VO = 2.4 V
VO = 5.5 V
VO = 20 V
II = 0 mA
VE = Don’t Care
II = 20 mA
VE = Don’t Care
VE = 2 V,
II = 20 mA
VO = VCC = 5.5 V II = 0 mA
VO = VCC = 20 V
5
Logic High Short
Circuit Output
Current
Input Capacitance
IOSH
-10
-25
CIN 120
mA VCC = 5.5 V II = 20 mA
mA VCC = 20 V VO = GND
pF f = 1 MHz, VI = 0 V dc,
Pins 1 and 2
5
1-327
5 Page 
Figure 18. Recommended Non-Isolated Active Transmitter with HCPL-4200 Isolated Receiver for Simplex Point-to-Point
20 mA Current Loop.
receiver, can be used at the
isolated end of current loops.
Cross talk and common mode
coupling are greatly reduced
when optical isolation is imple-
mented at the same end of both
loops, as shown. The full duplex
data rate is limited by the non-
isolated active receiver current
loop. Comments mentioned under
simplex configuration apply to
the full duplex case. Consult the
HCPL-4100 transmitter opto-
coupler data sheet for specified
device performance.
Half Duplex
The half duplex configuration,
whether point-to-point or
multidrop, gives non-
simultaneous bidirectional data
flow from transmitters to
receivers shown in Figures 22a
and 22b. This configuration
allows the use of two wires to
carry data back and forth
between local and remote units.
However, protocol must be used
to determine which specific
transmitter can operate at any
given time. Maximum data rate
for a half duplex system is limited
by the loop current charging
time. These considerations were
explained in the Simplex config-
uration section.
Figure 19. Minimum Required Supply
Voltage, V CC , vs. Loop Length for
Current Loop Circuit of Figure 19.
Figure 20. Typical Data Rate vs.
Distance.
Figure 21. Full Duplex Point-to-Point Current Loop System
Configuration.
Figures 22a and 22b illustrate
half duplex application for the
combination of HCPL-4100/-4200
optocouplers. The unique and
complementary designs of the
HCPL-4100 transmitter and
HCPL-4200 receiver
optocouplers provide many
designed-in benefits. For
example, total optical isolation at
one end of the current loop is
easily accomplished, which
results in substantial removal of
common mode influences,
elimination of ground potential
1-333
11 Page | ||
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