Drivers and level shifters.

MAX232, MAX232A

5V RS232 transceiver.
To operate, connect two capacitors to the C1 and C2 pins, one between the V- and GND, and one between V+ and GND. For the MAX232, capacitors should be 10uF, for the MAX232A 100nF is enough. 
      +---+--+---+
  C1+ |1  +--+ 16| VCC
   V+ |2       15| GND
  C1- |3       14| T1out
  C2+ |4  MAX  13| R1in
  C2- |5  232  12| R1out
   V- |6       11| T1in
T2out |7       10| T2in
 R2in |8        9| R2out
      +----------+

MAX242

5V RS232 transceiver with shutdown. 
      +---+--+---+
  /EN |1  +--+ 18| /SHDN
  C1+ |2       17| VCC
   V+ |3       16| GND
  C1- |4       15| T1out
  C2+ |5  MAX  14| R1in
  C2- |6  242  13| R1out
   V- |7       12| T1in
T2out |8       11| T2in
 R2in |9       10| R2out
      +----------+

LTC485

Quad RS485 line driver. 
     +---+--+---+            +---+---*---+---+
 1A1 |1  +--+ 16| VCC        | A | EN| Y |/Y |
 1Y1 |2       15| 2A2        +===+===*===+===+
/1Y1 |3       14| 2Y2        | 0 | 1 | 0 | 1 |
 1EN |4       13| /2Y2       | 1 | 1 | 1 | 0 |
/1Y2 |5 75174 12| 2EN        | X | 0 | Z | Z |
 1Y2 |6       11| /2Y1       +---+---*---+---+
 1A2 |7       10| 2Y1
 GND |8        9| 2A1
     +----------+

LTC485

RS485 line transceiver. 
    +---+--+---+             Receiver:           Transmitter:
  Y |1  +--+  8| VCC         +-------+---*---+   +---+---*---+---+
/OE |2        7| B           |  A-B  |/OE| Y |   | D |DEN| A | B |
DEN |3  75176 6| A           +=======+===*===+   +===+===*===+===+
  D |4        5| GND         |>+200mV| 0 | 1 |   | 0 | 1 | 0 | 1 |
    +----------+             |<-200mV| 0 | 0 |   | 1 | 1 | 1 | 0 |
                             |   X   | 1 | Z |   | X | 0 | Z | Z |
                             +-------+---*---+   +---+---*---+---+

LTC488

Quad RS485 line receiver.
Note the unusual ORed output enables. 
    +---+--+---+             +-------+---+---*---+
 B1 |1  +--+ 16| VCC         |  A-B  | OE|/OE| Y |
 A1 |2       15| B4          +=======+===+===*===+
 Y1 |3       14| A4          |>+200mV| 1 | X | 1 |
 OE |4       13| Y4          |>+200mV| X | 0 | 1 |
 Y2 |5 75173 12| /OE         |<-200mV| 1 | X | 0 |
 A2 |6       11| Y3          |<-200mV| X | 0 | 0 |
 B2 |7       10| A3          |   X   | 0 | 1 | Z |
GND |8        9| B3          +-------+---+---*---+
    +----------+

LTC489

Quad RS485 line receiver. 
    +---+--+---+             +-------+---*---+
1B1 |1  +--+ 16| VCC         |  A-B  | OE| Y |
1A1 |2       15| 2B2         +=======+===*===+
1Y1 |3       14| 2A2         |>+200mV| 1 | 1 |
1OE |4       13| 2Y2         |<-200mV| 1 | 0 |
1Y2 |5 75175 12| 2OE         |   X   | 0 | Z |
1A2 |6       11| 2Y1         +-------+---*---+
1B2 |7       10| 2A1
GND |8        9| 2B1
    +----------+

MC1413

7-bit 50V 500mA TTL-input NPN darlington driver.
The drivers need no power supply; the VDD pin is the common cathode of the seven integrated protection diodes. 
    +---+--+---+             +---*---+
 A0 |1  +--+ 16| /Y0         | A |/Y |
 A1 |2       15| /Y1         +===*===+
 A2 |3       14| /Y2         | 0 | Z |
 A3 |4  ULN  13| /Y3         | 1 | 0 |
 A4 |5  2003 12| /Y4         +---*---+
 A5 |6       11| /Y5
 A6 |7       10| /Y6
GND |8        9| VDD
    +----------+

1488

TTL to RS232 level shifter.
The outputs are at RS-232 levels, and sometimes are connected to ground through a small capacitor (up to 470 pF) to reduce slew-rate. Note that 1B is missing (and can be taken to be 1 at all times). Usually VDD=+12 and VEE=-12. 
    +---+--+---+          +---+---*-----+
VEE |1  +--+ 14| VDD      | A | B |  Y  |
 1A |2       13| 4A       +===+===*=====+
 1Y |3       12| 4B       | 0 | 0 | VDD |
 2A |4  1488 11| 4Y       | 0 | 1 | VDD |
 2B |5       10| 3A       | 1 | 0 | VDD |
 2Y |6        9| 3B       | 1 | 1 | VEE |
GND |7        8| 3Y       +---+---*-----+
    +----------+

1489

RS232 to TTL level shifter.
A inputs are RS232-level inputs, C inputs are response control, a TTL signal which could be used to adjust threshhold and hysteresis but is generally unnecessary and unused. It is often tied through a 300 - 470 pF capacitor to ground. 
    +---+--+---+
 1A |1  +--+ 14| VCC
 1C |2       13| 4A
 1Y |3       12| 4C
 2A |4  1489 11| 4Y
 2C |5       10| 3A
 2Y |6        9| 3C
GND |7        8| 3Y
    +----------+

ULN2003

7-bit 50V 500mA TTL-input NPN darlington driver.
The drivers need no power supply; the VDD pin is the common cathode of the seven integrated protection diodes. 
    +---+--+---+             +---*---+
 A0 |1  +--+ 16| /Y0         | A |/Y |
 A1 |2       15| /Y1         +===*===+
 A2 |3       14| /Y2         | 0 | Z |
 A3 |4  ULN  13| /Y3         | 1 | 0 |
 A4 |5  2003 12| /Y4         +---*---+
 A5 |6       11| /Y5
 A6 |7       10| /Y6
GND |8        9| VDD
    +----------+

UDN2585

7-bit 50V 500mA TTL-input PNP (high-side) darlington driver.
The drivers need no power supply; the GND pin is the common anode of the seven integrated protection diodes. 
    +---+--+---+             +---*---+
 A0 |1  +--+ 16| /Y0         | A |/Y |
 A1 |2       15| /Y1         +===*===+
 A2 |3       14| /Y2         | 0 | Z |
 A3 |4  UDN  13| /Y3         | 1 | 0 |
 A4 |5  2585 12| /Y4         +---*---+
 A5 |6       11| /Y5
 A6 |7       10| /Y6
VCC |8        9| GND
    +----------+

26LS31

4-bit 3-state RS422 line driver. 
    +---+--+---+
 1A |1  +--+ 16| VCC
 1Y |2       15| 4A
/1Y |3       14| 4Y
 CE |4  26LS 13| /4Y
/2Y |5   31  12| /CE
 2Y |6       11| /3Y
 2A |7       10| 3Y
GND |8        9| 3A
    +----------+

26LS32

Quad RS422 line receiver.
Note the unusual ORed output enables. 
    +---+--+---+             +-------+---+---*---+
 B1 |1  +--+ 16| VCC         |  A-B  | OE|/OE| Y |
 A1 |2       15| B4          +=======+===+===*===+
 Y1 |3       14| A4          |>+200mV| 1 | X | 1 |
 OE |4  26LS 13| Y4          |>+200mV| X | 0 | 1 |
 Y2 |5   32  12| /OE         |<-200mV| 1 | X | 0 |
 A2 |6       11| Y3          |<-200mV| X | 0 | 0 |
 B2 |7       10| A3          |   X   | 0 | 1 | Z |
GND |8        9| B3          +-------+---+---*---+
    +----------+

ULN2803

8-bit 50V 500mA TTL-input NPN darlington driver.
The drivers need no power supply; the VDD pin is the common cathode of the eight integrated protection diodes. 
    +---+--+---+             +---*---+
 A0 |1  +--+ 18| /Y0         | A |/Y |
 A1 |2       17| /Y1         +===*===+
 A2 |3       16| /Y2         | 0 | Z |
 A3 |4  ULN  15| /Y3         | 1 | 0 |
 A4 |5  2803 14| /Y4         +---*---+
 A5 |6       13| /Y5
 A6 |7       12| /Y6
 A7 |8       11| /Y7
GND |9       10| VDD
    +----------+

UCN5800

4-bit 50V 500mA TTL-input NPN darlington driver with input latches and output enable.
The VDD pin is the common cathode of the four integrated protection diodes. 
    +---+--+---+
RST |1  +--+ 14| /OE
 LE |2       13| VCC
 D1 |3       12| /Q1
 D2 |4  UCN  11| /Q2
 D3 |5  5800 10| /Q3
 D4 |6        9| /Q4
GND |7        8| VDD
    +----------+

UCN5801

8-bit 50V 500mA TTL-input NPN darlington driver with input latches and output enable.
The VDD pin is the common cathode of the eight integrated protection diodes. 
    +---+--+---+
RST |1  +--+ 22| /OE
 LE |2       21| VCC
 D0 |3       20| /Q0
 D1 |4       19| /Q1
 D2 |5       18| /Q2
 D3 |6  UCN  17| /Q3
 D4 |7  5801 16| /Q4
 D5 |8       15| /Q5
 D6 |9       14| /Q6
 D7 |10      13| /Q7
GND |11      12| VDD
    +----------+

UCN5810

10-bit serial-in 60V 40mA TTL-input PNP (high-side) darlington driver with output latches and output enable.
The VDD pin is the output supply voltage. 
    +---+--+---+
 Q7 |1  +--+ 18| Q8
 Q6 |2       17| Q9
 Q5 |3       16| SOUT
CLK |4       15| VDD
GND |5  UCN  14| SIN
VCC |6  5810 13| /OE
 LE |7       12| Q0
 Q4 |8       11| Q1
 Q3 |9       10| Q2
    +----------+

UCN5815

8-bit 60V 40mA TTL-input PNP (high-side) darlington driver with input latches and output enable.
The VDD pin is the output supply voltage. 
    +---+--+---+
RST |1  +--+ 22| /OE
 LE |2       21| VCC
 D0 |3       20| Q0
 D1 |4       19| Q1
 D2 |5       18| Q2
 D3 |6  UCN  17| Q3
 D4 |7  5815 16| Q4
 D5 |8       15| Q5
 D6 |9       14| Q6
 D7 |10      13| Q7
GND |11      12| VDD
    +----------+

UCN5821, UCN5822

8-bit serial-in 50/80V 500mA TTL-input NPN darlington driver with output latches and output enable.
Maximum open collector voltage is 50V for UCN5821 and 80V for UCN5822. 
     +---+--+---+
 CLK |1  +--+ 16| /Q0
 SIN |2       15| /Q1
 GND |3       14| /Q2
 VCC |4  UCN  13| /Q3
SOUT |5  5821 12| /Q4
  LE |6  5822 11| /Q5
 /OE |7       10| /Q6
 GND |8        9| /Q7
     +----------+

UCN5890, UCN5891, UCN5895

8-bit serial-in 50/80V 250/500mA TTL-input PNP (high-side) darlington driver with output latches and output enable.
Maximum open collector voltage is 50V for UCN5891 and UCN5895 and 80V for UCN5890. Output current is 250mA for UCN5895, 500mA for UCN5890 and UCN5891. The VDD pin is the output supply voltage. 
    +---+--+---+
GND |1  +--+ 16| SOUT
CLK |2       15| VCC
SIN |3       14| /OE
 LE |4  UCN  13| VDD
 Q0 |5  589x 12| Q7
 Q1 |6       11| Q6
 Q2 |7       10| Q5
 Q3 |8        9| Q4
    +----------+

DS8863, DS8963

8-bit 10V/18V 500mA TTL-input NPN darlington driver.
Maximum open collector voltage is 10V for DS8863 and 18V for DS8963. 
    +---+--+---+             +---*---+
/Y0 |1  +--+ 18| VCC         | A |/Y |
 A0 |2       17| A7          +===*===+
 A1 |3       16| /Y7         | 0 | Z |
/Y1 |4  DS   15| A6          | 1 | 0 |
/Y2 |5  8863 14| /Y6         +---*---+
 A2 |6  8963 13| A5
/Y3 |7       12| /Y5
 A3 |8       11| A4
GND |9       10| /Y4
    +----------+

75173

Quad RS485 line receiver.
Note the unusual ORed output enables. 
    +---+--+---+             +-------+---+---*---+
 B1 |1  +--+ 16| VCC         |  A-B  | OE|/OE| Y |
 A1 |2       15| B4          +=======+===+===*===+
 Y1 |3       14| A4          |>+200mV| 1 | X | 1 |
 OE |4       13| Y4          |>+200mV| X | 0 | 1 |
 Y2 |5 75173 12| /OE         |<-200mV| 1 | X | 0 |
 A2 |6       11| Y3          |<-200mV| X | 0 | 0 |
 B2 |7       10| A3          |   X   | 0 | 1 | Z |
GND |8        9| B3          +-------+---+---*---+
    +----------+

75174

Quad RS485 line driver. 
     +---+--+---+            +---+---*---+---+
 1A1 |1  +--+ 16| VCC        | A | EN| Y |/Y |
 1Y1 |2       15| 2A2        +===+===*===+===+
/1Y1 |3       14| 2Y2        | 0 | 1 | 0 | 1 |
 1EN |4       13| /2Y2       | 1 | 1 | 1 | 0 |
/1Y2 |5 75174 12| 2EN        | X | 0 | Z | Z |
 1Y2 |6       11| /2Y1       +---+---*---+---+
 1A2 |7       10| 2Y1
 GND |8        9| 2A1
     +----------+

75175

Quad RS485 line receiver. 
    +---+--+---+             +-------+---*---+
1B1 |1  +--+ 16| VCC         |  A-B  | OE| Y |
1A1 |2       15| 2B2         +=======+===*===+
1Y1 |3       14| 2A2         |>+200mV| 1 | 1 |
1OE |4       13| 2Y2         |<-200mV| 1 | 0 |
1Y2 |5 75175 12| 2OE         |   X   | 0 | Z |
1A2 |6       11| 2Y1         +-------+---*---+
1B2 |7       10| 2A1
GND |8        9| 2B1
    +----------+

75176

RS485 line transceiver. 
    +---+--+---+             Receiver:           Transmitter:
  Y |1  +--+  8| VCC         +-------+---*---+   +---+---*---+---+
/OE |2        7| B           |  A-B  |/OE| Y |   | D |DEN| A | B |
DEN |3  75176 6| A           +=======+===*===+   +===+===*===+===+
  D |4        5| GND         |>+200mV| 0 | 1 |   | 0 | 1 | 0 | 1 |
    +----------+             |<-200mV| 0 | 0 |   | 1 | 1 | 1 | 0 |
                             |   X   | 1 | Z |   | X | 0 | Z | Z |
                             +-------+---*---+   +---+---*---+---+

75188

TTL to RS232 level shifter.
The outputs are at RS-232 levels, and sometimes are connected to ground through a small capacitor (up to 470 pF) to reduce slew-rate. Note that 1B is missing (and can be taken to be 1 at all times). Usually VDD=+12 and VEE=-12. 
    +---+--+---+          +---+---*-----+
VEE |1  +--+ 14| VDD      | A | B |  Y  |
 1A |2       13| 4A       +===+===*=====+
 1Y |3       12| 4B       | 0 | 0 | VDD |
 2A |4  1488 11| 4Y       | 0 | 1 | VDD |
 2B |5       10| 3A       | 1 | 0 | VDD |
 2Y |6        9| 3B       | 1 | 1 | VEE |
GND |7        8| 3Y       +---+---*-----+
    +----------+

75189

RS232 to TTL level shifter.
A inputs are RS232-level inputs, C inputs are response control, a TTL signal which could be used to adjust threshhold and hysteresis but is generally unnecessary and unused. It is often tied through a 300 - 470 pF capacitor to ground. 
    +---+--+---+
 1A |1  +--+ 14| VCC
 1C |2       13| 4A
 1Y |3       12| 4C
 2A |4  1489 11| 4Y
 2C |5       10| 3A
 2Y |6        9| 3C
GND |7        8| 3Y
    +----------+

75452

Dual NAND line driver. 
    +---+--+---+
 1A |1  +--+  8| VCC
 1B |2        7| 2B
 1Y |3 75452  6| 2A
GND |4        5| 2Y
    +----------+

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