74OL6001 Fairchild Semiconductor, 74OL6001 Datasheet - Page 14

• Manufacturer Part Number: 74OL6001
• Description: High Speed Optocouplers DIP-6 HS OPTOLOGIC
• Manufacturer: Fairchild Semiconductor

Specifications of 74OL6001

• Isolation Voltage: 5.3 kV
• Output Device: Logic Gate Photo IC
• Maximum Baud Rate: 15 MBps
• Number Of Elements: 1
• Input Type: Buffered
• Output Type: Totem Pole
• Output Current: 40mA
• Package Type: PDIP-B
• Operating Temp Range: 0C to 70C
• Power Dissipation: 350mW
• Propagation Delay Time: 100ns
• Pin Count: 6
• Mounting: Through Hole
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 74OL6001_NL

©2000 Fairchild Semiconductor Corporation
74OL60XX Rev. 1.0.4
HORIZONTAL = 20ns/DIV 42-11
VERTICAL = 2V/DIV
ALL DIODES
1N6263
Application
Local area data communication systems can greately improve their noise immunity by including OPOTOLOGIC gates
in the design.
The Optologic input amplifier offers the feature of very high input impedance that permits their use as bridged line
receivers. The system show above illustrates an optically isolated transmitter and multidrop receiver system. The net-
work uses a 74OL6000 and buffer (Figure D) to isolate the transmitter and drive the 75Ω coax cable. This application
uses a 1000 ft. aerial suspension 75Ω CATV coax cable with data taps at 250 ft. intervals. The 74OL6001s function as
bridged receivers, and as many as 30 receivers could be placed along the line with minimal signal degradation. The
communication cable is terminated with a single 75Ω load at the far end of the line.
Signal quality "Eye Pattern" is shown in Figures A, B and C with a 10MBaud NRZ Psuedo-Random Sequence (PRS).
Traces 1-3 in Figure A describes the transmitter section. Traces 4-7 in Figure B show the output of the four Optologic
bridged terminations. Traces 8-11 in Figure C illustrate "Eye Pattern" as seen at the output of a 74LS04 logic gate. The
data quality is well preserved in that only a 30% Eye closure is seen at the receiver located 1000 ft. from the transmit-
ter.
The data communication system is completely optically isolated from all of the terminal equipments. Power for the
transmitter (V
senger wire.
1.1 K
100 F
0.1 F
Figure D Buffer
Figure A
CCO
2N4252
) and receiver (V
1 K
1.1 K
2N4252
2N2222
10
CCI
) is taken from an isolated power supply and distributed through a drain or mes-
100 ns BIT
INTERVAL
HORIZONTAL = 20ns/DIV 42-12, 02
VERTICAL = 2V/DIV
PRSG
1
74
OL
6000
Figure B
2
BUFFER
14
3
250 FT.
4
8
74
LS04
OL
250 FT.
6001
1000 FT.
5
9
HORIZONTAL = 20ns/DIV 42-13/03
VERTICAL = 2V/DIV
74
LS04
OL
250 FT.
6001
10
6
74
LS04
Figure C
OL
250 FT.
6001
11
7
74
LS04
OL
www.fairchildsemi.com
6001
75
TERMINAION