74LS86 quad 2-input exclusive-OR pinout
DIP-14. Four 2-input XOR gates; selectable inverters and phase switches
On the Electron, IC14 gate 4 XORs the ULA /CSYNC (pin 13, from ULA pin 65) with link LK3 (pin 12) to make RGB pin 4 sync of either polarity on pin 11; gate 1 mixes the subcarrier phase from the 74S74 IC11 pin 6 (pin 1) with the PAL/NTSC link LK2 (pin 2). IC14 and IC15 with IC10, IC16 and R50-R57 form the color encoder. A failed IC14 with pin 11 stuck low gives composite but no RGB.
Open the interactive 74LS86 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | 1A | io | Gate 1 input A. |
| 2 | 1B | io | Gate 1 input B. |
| 3 | 1Y | io | Gate 1 output (A XOR B). |
| 4 | 2A | io | Gate 2 input A. |
| 5 | 2B | io | Gate 2 input B. |
| 6 | 2Y | io | Gate 2 output. |
| 7 | GND | ground | Ground. |
| 8 | 3Y | io | Gate 3 output. |
| 9 | 3A | io | Gate 3 input A. |
| 10 | 3B | io | Gate 3 input B. |
| 11 | 4Y | io | Gate 4 output. |
| 12 | 4A | io | Gate 4 input A. |
| 13 | 4B | io | Gate 4 input B. |
| 14 | VCC | power | +5 V. |
Fitted in
- Acorn Electron IC14, IC15