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 www.fairchildsemi.com
Application Note AN-3002
Low Current Input Circuit Ideas 6N138/139 Series
Introduction
Advancements in opto-coupling and LED technology have given us the 6N139. This unique optocoupler, having an input LED current specification at 500 microamperes, has opened some interesting design doors. Besides the obvious and much written about ability to be directly driven by CMOS circuits, the 6N139 can be considered for signal detection, transient detection, matrices and non-loading line receiving. Following are but a few circuit ideas to stimulate the designer's interest. The LED is provided with a 50 microampere forward current to charge the LED capacity to the VF level. In this way, the LED is not causing conduction in its output circuitry but is prepared to conduct very quickly. Any noise or oscillation on the "D.C. power source" is coupled through "C" which develops a signal across the LED. Even small unwanted signals can cause a large change in the LED forward current. Once the LED's forward current equals or exceeds 500 microamperes, the output circuitry will conduct indicating the presence of the unwanted signal.
Signal Detection
The detection of noise, spikes or oscillations can easily and directly be detected by the input of the 6N139 as shown in the circuit of Figure 1.
C + R D.C. POWER SOURCE LED X 6N139
Transient Detection
The detection of the presence or absence of waveforms can easily be detected by the circuit in Figure 2.
RS CR 6N139 RL
INPUT
C
LED
X
Figure 2. Pulse or Waveform Detection Circuit Figure 1. 6N139 Input Circuit For Signal Detection
For the detection of the presence of a desired signal, pulse or waveform use:
CR=Silicon diode ( Positive Vpk. of input ) - 2.5 volts R L = ----------------------------------------------------------------------------------1 milliampere Pulse interval of 1/f C min = ---------------------------------------------RL Pulse width or 1/4f R S max = --------------------------------------------5C X=Non-Latching output circuitry to follow LED=Input diode of 6N139 f=frequency
For the detection of undesirable signals on a D.C. power source use:
Power supply voltage - 1.5 volts R = -----------------------------------------------------------------------------50 microamperes C=To inject 500 microamperes into LED X=Latching or non-latching output circuitry to follow LED=Input diode of 6N139
Examples: A desired pulse train to be present is shown in Figure 3.
REV. 4.00 4/30/02
AN-3002
APPLICATION NOTE
The resulting LED forward current that will keep the output circuitry conducting is shown as the result of proper design.
+ INPUT (Volts) t=0 LED (mA) OUTPUT (Volts) 1.0 0.5 0 5.0
Non-Loading Line Receiver
For virtual non-loading, the 6N139 is compatible with the differential amplifier circuit of Figure 6.
+V +V
6N139
or here 10K LED VREF IN
X VREF AS EXAMPLE 1mA
0.4
Figure 3. Pulse Train Waveforms
A desired sine wave to be present is shown in Figure 4. The resulting LED forward current that will keep the output circuitry conducting is shown as the result of proper design.
INPUT (Volts) + 0 t=0
RE
0.5 mA
Figure 6. Differential Amplifier Drive
For a virtual no-load optoisolator circuit use: X=Non-latching output circuitry to follow LED=Input diode of 6N139 Current requirement at "in" will be less than 20 micro Amperes.
1.0 LED (mA) 0.5 0 5.0 OUTPUT (Volts) 0.4
Example:
Figure 4. Sine Wave Waveforms
Matrices Opto-Coupling
With the low input LED current advantage of the 6N139, the ability to drive matrices with but one TTL output is now possible as shown in Figure 5.
5V 5.5K RESISTORS ALL ARE INPUT DIODES OF 6N139
If "VREF" is made to be +1.4 Volts and the RE is 1.2 K, the circuit will respond nicely to TTL "0" and "1" levels. That is, a "0" at "In" will cause LED current resulting in the conduction of the output circuitry. Conversely, a "1" at "In" will result in no LED current. Notice that depending upon which collector the LED is in series with it will give the option of LED current flowing with a "0" or a "1" at "In".
6N139 Output Circuitries
The following are two examples of 6N139 output circuitry. One latching (Figure 7); the other non-latching (Figure 8), but both capable of driving a TTL gate directly. Referring to Figure 7 and assuming that the "RESET" has been actuated by a momentary ground and no input signal is being received, all transistors shown are non-conducting (Output high, "1"). The arrival of an input signal will cause all transistors to turn on. (Output low, "0"). The PNP transistor, being turned on by the output transistor, will in turn latch that same output transistor or until the "RESET" is again initiated. In Figure 8, where no signal is being received, the input transistor is not conducting. The output transistor is very slightly conducting. The 4.7M resistor causing this slight conduction will not bring the "Output" to a "0" level. The purpose of this slight conduction is to reduce the turn-on delay time. When a signal is received, both input
REV. 4.00 4/30/02
SCAN
1 of 16 ACTIVE LOW
16 X 16 MATRIX
CONTROL
Figure 5. Opto-Coupling out of Matrices
2
APPLICATION NOTE
AN-3002
and output transistors are turned on causing the "Output" to a logic "0" state. The 4.7 M resistor will now tend to reduce the output transistor's turn-off time.
If you have not looked over the 6N139 specification sheet, you may not be totally aware of the current capabilities of Fairchild Semiconductor optocouplers.
(5V) +V 6N139 4.7K
4.7K 4.7K 4.7K OUTPUT TO TTL
4.7K *Normally OPEN momentary push-button or TTL output with open collector GROUND FOR RESET*
Figure 7. Latching Output Circuit for 6N139
(5V) +V 6N139 4.7K
4.7M
OUTPUT TO TTL
Figure 8. NON-Latching Output Circuit for 6N139
REV. 4.00 4/30/02
3
AN-3002
APPLICATION NOTE
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com 4/30/02 0.0m 001 Stock#AN300000xx 2002 Fairchild Semiconductor Corporation


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IRCOUP1052		 Vishay Intertechnologies HIGHSPEED COUPLER, 100KBD, THT 2000: USD0.5364
4000: USD0.516
6000: USD0.5076
8000: USD0.4704
 BuyNow
1300

Sensible Micro Corporation

Part # Manufacturer Description Price BuyNow  Qty.
6N139
SMC-6N139		 onsemi High Speed Optocouplers Darlington 100Kbd Transistor Output 1000: USD0.48
500: USD0.48
100: USD0.48
 RFQ
11
6N139
SMC-6N139		 HEWLETT PACKARD(HP) OEM Excess 5-7 Days Leadtime, We are an AS6081 Certified Vendor, 1 Yr Warranty RFQ
1114
6N139
SMC-6N139		 onsemi High Speed Optocouplers Darlington 100Kbd Transistor Output 1000: USD0.48
500: USD0.48
100: USD0.48
 RFQ
3
6N139-X009T OR EQUIVALENT
SMC-6N139-X009T OR EQUIVALENT		 Vishay Intertechnologies AS6081 Certified Vendor, 1 Yr Warranty RFQ
4228

Chip 1 Exchange

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 General Electric Company INSTOCK RFQ
1465
6N139
 Hewlett Packard Co INSTOCK RFQ
1
6N139
 Agilent Technologies Inc INSTOCK RFQ
1521
6N139
 INSTOCK RFQ
1465
6N139
 Asahi Kasei Microsystems Corporation INSTOCK RFQ
50

Avnet Asia

Part # Manufacturer Description Price BuyNow  Qty.
6N139-X017T
6N139-X017T		 Vishay Intertechnologies SMD-8 OPTOCPLR 100KBD CTR>500% VDE -e3 (Alt: 6N139-X017T) RFQ
0

Avnet Silica

Part # Manufacturer Description Price BuyNow  Qty.
6N139M
6N139M		 onsemi Optocoupler DC-IN 1-CH Darlington With Base DC-OUT 8-Pin PDIP White Tube (Alt: 6N139M) BuyNow
1000
6N139SM
6N139SM		 onsemi Optocoupler DC-IN 1-CH Darlington With Base DC-OUT 8-Pin PDIP SMD White Bulk (Alt: 6N139SM) BuyNow
0
6N139SDM
6N139SDM		 onsemi Optocoupler DC-IN 1-CH Darlington With Base DC-OUT 8-Pin PDIP SMD White T/R (Alt: 6N139SDM) BuyNow
0
6N139TVM
6N139TVM		 onsemi (Alt: 6N139TVM) BuyNow
0
6N139SDVM
6N139SDVM		 onsemi (Alt: 6N139SDVM) BuyNow
0

CHIPMALL.COM LIMITED

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 CT Micro International Corporation 1kV/us DC DIP-8 Optocouplers - Logic Output ROHS 5: USD0.44267
50: USD0.30752
150: USD0.2644
500: USD0.2451
2500: USD0.23324
 BuyNow
290
6N139M
 onsemi 8 DIP 1: USD0.51592
 BuyNow
1870
6N139S(TA)
 Everlight Electronics Co Ltd 5kV 60mA 1 1.3V DC SMD-8P Optocouplers - Phototransistor Output ROHS 5: USD0.28293
50: USD0.22844
150: USD0.20727
500: USD0.19816
2500: USD0.19365
 BuyNow
5665
6N139SM
 Isocom Components 1kV/us DC SOP-8-2.54mm Optocouplers - Logic Output ROHS 5: USD0.32369
50: USD0.23295
150: USD0.19972
500: USD0.18453
2500: USD0.17552
 BuyNow
703
AT6N139-CUH-D
 AOTE DIP-8 Logic Output Optocoupler ROHS 1: USD0.37211
10: USD0.30106
45: USD0.27234
90: USD0.23451
495: USD0.21785
990: USD0.20727
 BuyNow
1437

Component Electronics, Inc

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 Siemens IN STOCK SHIP TODAY 1000: USD0.5
100: USD0.58
1: USD0.77
 BuyNow
6
6N139
 Fairchild Semiconductor Corporation IN STOCK SHIP TODAY 1000: USD0.5
100: USD0.58
1: USD0.77
 BuyNow
15
6N139
 QTC IN STOCK SHIP TODAY 1000: USD0.5
100: USD0.58
1: USD0.77
 BuyNow
27
6N139
 Lite-On Semiconductor Corporation IN STOCK SHIP TODAY 1000: USD0.5
100: USD0.58
1: USD0.77
 BuyNow
53
6N139
 Hewlett Packard Co IN STOCK SHIP TODAY 1000: USD0.5
100: USD0.58
1: USD0.77
 BuyNow
17

EBV Elektronik

Part # Manufacturer Description Price BuyNow  Qty.
6N139-000E
6N139-000E		 Broadcom Limited Optocoupler DC-IN 1-CH Darlington With Base DC-OUT 8-Pin PDIP Tube (Alt: 6N139-000E) BuyNow
155650
6N139
6N139		 Vishay Intertechnologies Optocoupler DC-IN 1-CH Darlington With Base DC-OUT (Alt: 6N139) BuyNow
4000
6N139#300
6N139#300		 Broadcom Limited Optocoupler DC-IN 1-CH Darlington With Base DC-OUT 8-Pin PDIP SMD Tube (Alt: 6N139#300) BuyNow
600
6N139
6N139		 Broadcom Limited Optocoupler 1-CH DC-OUT 3750Vrms 8-Pin DIP Tube (Alt: 6N139) BuyNow
0
6N139
3901390000		 Everlight Electronics Co Ltd Optocoupler DC 1-CH DC-OUT 8-Pin DIP Tube (Alt: 3901390000) BuyNow
0

Flip Electronics

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 Broadcom Limited Stock, ship today 1: USD0.83
 RFQ
2109
6N139VM
 onsemi Stock, ship today 1: USD0.41
 RFQ
4000
6N139TVM
 onsemi Stock, ship today 1: USD0.42
 RFQ
4000
6N139SVM
 onsemi Stock, ship today 1: USD0.42
 RFQ
4000
6N139SDVM
 onsemi Stock, ship today 1: USD0.35
 RFQ
41000

MacroQuest Electronics

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 Vishay Intertechnologies ISO 9001: 2015; ISO 14001:2015; ISO 45001:2018 100: USD44.57
500: USD222.86
 BuyNow
1490

New Advantage Corporation

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 Vishay Intertechnologies TSSOP-16 2000: USD0.65
4000: USD0.6015
 BuyNow
4000
6N139S-L
 Lite-On Semiconductor Corporation 550: USD0.2629
1200: USD0.2453
 BuyNow
1200
6N139SDM
 onsemi 6N139M Series Single Channel 7 V 5000 Vrms Darlington Optocoupler - DIP-8 1000: USD0.8357
2000: USD0.78
 BuyNow
2000
6N139-L
 Lite-On Semiconductor Corporation 500: USD0.2857
1500: USD0.2667
 BuyNow
1500
6N139S-TA1-L
 Lite-On Semiconductor Corporation IC-6N139 OPTO SMD8 600: USD0.5971
3517: USD0.5573
 BuyNow
3517

Ozdisan Elektronik

Part # Manufacturer Description Price BuyNow  Qty.
6N139
 Isocom Components IC-6N139 OPTO DIP8 ISOCOM 45: USD0.5378
1: USD0.61847
 BuyNow
829
6N139SM
 Isocom Components IC-6N139 OPTO SOP8 45: USD1.0755
1: USD1.18305
 BuyNow
447
6N139SMT&R
 Isocom Components IC-6N139 OPTO 5KV TRANS. OUTPUT 1CH SMD8 1000: USD0.4767
1: USD0.5482
 BuyNow
3737
6N139G
 Isocom Components OPTO COUPLER HIGH SPEED 45: USD0.5866
1: USD0.67459
 RFQ
0

Sense Electronic Company Limited

Part # Manufacturer Description Price BuyNow  Qty.
6N139SDM
 onsemi SOP8 RFQ
24000
6N139(S)(T1)
 CT SOP RFQ
10107
6N139-560E
 Avago Technologies SOP8 RFQ
10000
6N139-500E
 Avago Technologies SOP8 RFQ
27000

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