Pinout information

1488, 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 I  Y  |
 1A |2       13| 4A       +===+===+=====+
 1Y |3       12| 4B       | 0 | 0 I VDD |
 2A |4  1488 11| 4Y       | 0 | 1 I VDD |
 2B |5       10| 3A       | 1 | 0 I VDD |
 2Y |6        9| 3B       | 1 | 1 I VEE |
GND |7        8| 3Y       +---+---+-----+
    +----------+


1489, 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
    +----------+

This pinout is from GIICM

4N33, ECG3083

Optoisolater with split Darlington output.  
Vcc = 18 V max., 8 pin DIP.

Pin 1: NC
Pin 2: LED Anode
Pin 3: LED Cathode
Pin 4: NC
Pin 5: Gnd/Q2 Emitter
Pin 6: Q2 Collector
Pin 7: Q1 Emitter/Q2 Base
Pin 8: Vcc/PD Anode/Q1 collector.

Cross reference data

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