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Ethernet 10Base-T, 100Base-TX

Ethernet 10Base-T, 100Base-TX

RJ-45


RJ45 diagram
Pin Color Signal Straight to Crossover to
1 White/Orange     TX+ 1 3
2 Orange   TX- 2 6
3 White/Green     RX+ 3 1
4 Blue   unused unused unused
5 White/Blue     unused unused unused
6 Green   RX- 6 2
7 White/Brown     unused unused unused
8 Brown   unused unused unused
As per EIA-586B Standard

Serial ports

Serial ports

DB-9

(male)

DB9 diagram

DB-25

(male)

DB25 diagram
Pin on
DB-25
Pin on
DB-9
Signal Function Details Sense
(on PC)
2 3 TD Transmit Data Serial data output (TXD) Out
3 2 RD Receive Data Serial data input (RXD) In
4 7 RTS Request To Send PC informs modem that it is ready to exchange data Out
5 8 CTS Clear To Send Modem informs PC that it is ready to exchange data In
6 6 DSR Data Set Ready Modem informs PC that it is ready to establish link In
7 5 SG Signal Ground Ground reference -
8 1 CD Carrier Detect Modem informs PC that it has established link with other modem In
20 4 DTR Data Terminal Ready PC tells modem that it is ready to establish link Out
22 9 RI Ring Indicator Modem informs PC that the phone line is ringing In

Null modem cables

Null modem cables
PC DB-25 Male Connection Remote DB-25
Signal Function Sense Pin Pin Signal Function Sense
TD Transmit Data Out 2 3 RD Receive Data In
RD Receive Data In 3 2 TD Transmit Data Out
SG Signal ground - 7 7 SG Signal ground -
CTS Clear To Send In 5 4 RTS Request To Send Out
RTS Request To Send Out 4 5 CTS Clear To Send In
DSR Data Set Ready In 6 20 DTR Data Terminal Ready Out
DTR Data Terminal Ready Out 20 6 DSR Data Set Ready In
PC DB-9 Male Connection Remote DB-25
Signal Function Sense Pin Pin Signal Function Sense
RD Receive Data In 2 2 TD Transmit Data Out
RD Receive Data In 3 3 TD Transmit Data Out
SG Signal ground - 5 7 SG Signal ground -
CTS Clear To Send In 8 4 RTS Request To Send Out
RTS Request To Send Out 7 5 CTS Clear To Send In
DSR Data Set Ready In 6 20 DTR Data Terminal Ready Out
DTR Data Terminal Ready Out 4 6 DSR Data Set Ready In
PC DB-9 Male Connection Remote DB-9
Signal Function Sense Pin Pin Signal Function Sense
RD Receive Data In 2 3 TD Transmit Data Out
RD Receive Data In 3 2 TD Transmit Data Out
SG Signal ground - 5 5 SG Signal ground -
CTS Clear To Send In 8 7 RTS Request To Send Out
RTS Request To Send Out 7 8 CTS Clear To Send In
DSR Data Set Ready In 6 4 DTR Data Terminal Ready Out
DTR Data Terminal Ready Out 4 6 DSR Data Set Ready In

Note: Linux uses RTS/CTS flow control.


Graphics for sockets and plugs

DB
(Canon subminiature)
DB25 Male Diagram DB9 Male Diagram
MINI DIN MINI-DIN 8 Male Diagram
RJ RJ45 Plug Diagram RJ45 Socket Diagram

Resistor color codes

Color 4 band codes 5 band codes
1st band
(digit)
2nd band
(digit)
3rd band
(multiplier)
4th band
(tolerance)
1st band
(digit)
2nd band
(digit)
3rd band
(digit)
4th band
(multiplier)
5th band
(tolerance)
Black   0 0     0 0 0    
Brown   1 1 0   1 1 1 0 1 %
Red   2 2 00   2 2 2 00 2 %
Orange   3 2 000   3 3 3 000  
Yellow   4 4 0 000   4 4 4 0 000  
Green   5 5 00 000   5 5 5 00 000  
Blue   6 6 000 000   6 6 6 000 000  
Magenta   7 7     7 7 7    
Gray   8 8     8 8 8    
White   9 9     9 9 9    
Gold       x 0.1 5 %       x 0.1  
Silver       x 0.01 10 %       x 0.01  

Transistor and FET pinout

TO-18 transistor package TO-92 transistor package

Series resistor table for LEDs

LED color If nominal Supply voltage
5 V 12 V 15 V 24 V
Red 10 mA 270 Ω
1/8 W
1 kΩ
1/8 W
1.2 kΩ
1/4 W
2.2 kΩ
1/4 W
Green
Yellow
Amber
20 mA 120 Ω
1/8 W
470 Ω
1/4 W
560 Ω
1/2 W
1 kΩ
1/2 W

Selected IC pinouts

DXF file

74x138 Decoder/Multiplexer
74x138 Decoder/Multiplexer On G2A and G2B low, G1 high, output selected by A,B and C goes low
Maximum ratings for LS family
Max HIGH level output current -0.4 mA
Max LOW level output current 8 mA
Max HIGH level input current 20 µA
Max LOW level input current -0.36 mA
Datasheet (external link)
74x154 4-Line to 16-Line Decoder/Demultiplexer
74x154 4-Line to 16-Line Decoder/Demultiplexer On G1 and G2 low, output selected by A,B, C and D goes low
Maximum ratings for LS family
Max HIGH level output current -0.4 mA
Max LOW level output current 8 mA
Max HIGH level input current 20 µA
Max LOW level input current -0.4 mA
Datasheet (external link)
74x373 3-STATE Octal D-Type Transparent Latches
74x373 3-STATE Octal D-Type Transparent Latches On G high, outputs follow inputs
On G low, outputs retains previous state
With OE low, outputs are driven
With OE high, outputs are in high impedance
Maximum ratings for LS family
Max HIGH level output current -2.6 mA
Max LOW level output current 24 mA
Max HIGH level input current 20 µA
Max LOW level input current -0.4 mA
Datasheet (external link)
74x374 3-STATE Octal Edge-triggered D-type Flip-Flop
74x374 3-STATE Octal Edge-triggered D-type Flip-Flop CLOCK rising edge copies inputs to outputs
With OE low, outputs are driven
With OE high, outputs are in high impedance
Maximum ratings for LS family
Max HIGH level output current -2.6 mA
Max LOW level output current 24 mA
Max HIGH level input current 20 µA
Max LOW level input current -0.4 mA
Datasheet (external link)
74x573 3-STATE Octal D-Type Transparent Latches (PCB friendly pinout)
74x573 3-STATE Octal D-Type Transparent Latches On G high, outputs follow inputs
On G low, outputs retains previous state
With OE low, outputs are driven
With OE high, outputs are in high impedance
Maximum ratings for LS family
Max HIGH level output current -2.6 mA
Max LOW level output current 24 mA
Max HIGH level input current 20 µA
Max LOW level input current -0.4 mA
Datasheet (external link)
74x574 3-STATE Octal Edge-triggered D-type Flip-Flop (PCB friendly pinout)
74x574 3-STATE Octal Edge-triggered D-type Flip-Flop CLOCK rising edge copies inputs to outputs
With OE low, outputs are driven
With OE high, outputs are in high impedance
Maximum ratings for LS family
Max HIGH level output current -2.6 mA
Max LOW level output current 24 mA
Max HIGH level input current 20 µA
Max LOW level input current -0.4 mA
Datasheet (external link)
Last update: Wed, 2 Nov 2005 10:16:21 GMT