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# $Id: pinouts.txt,v 1.1 2001/03/03 21:08:13 abhijit Exp $
Pinouts of various 74HCT series ICs used in the EEP EEPROM burner

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74HCT123

Dual retriggerable monostable multivibrators with overriding reset.

       +---+--+---+
   /A1 |1  +--+ 16| VCC
    B1 |2       15| RCext1
 /CLR1 |3       14| Cext1
   /Q1 |4       13| Q1
    Q2 |5  123  12| /Q2
 Cext2 |6       11| /CLR2
RCext2 |7       10| B2
   GND |8        9| /A2
       +----------+

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74HCT132
  
Quad 2-input NAND gates with schmitt-trigger inputs.

    +---+--+---+             +---+---*---+           __
 A1 |1  +--+ 14| VCC         | A | B |/Y |      /Y = AB
 B1 |2       13| B4          +===+===*===+
/Y1 |3       12| A4          | 0 | 0 | 1 |
 A2 |4  132  11| /Y4         | 0 | 1 | 1 |
 B2 |5       10| B3          | 1 | 0 | 1 |
/Y2 |6        9| A3          | 1 | 1 | 0 |
GND |7        8| /Y3         +---+---*---+
    +----------+

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74HCT138
  
1-of-8 inverting decoder/demultiplexer.

     +---+--+---+            +---+----+----+---+---+---*---+---+---+---+
  A0 |1  +--+ 16| VCC        |CS1|/CS2|/CS3| A2| A1| A0|/Y0|/Y1|...|/Y7|
  A1 |2       15| /Y0        +===+====+====+===+===+===*===+===+===+===+
  A2 |3       14| /Y1        | 0 | X  |  X | X | X | X | 1 | 1 | 1 | 1 |
/CS2 |4  138  13| /Y2        | X | 1  |  X | X | X | X | 1 | 1 | 1 | 1 |
/CS3 |5       12| /Y3        | X | X  |  1 | X | X | X | 1 | 1 | 1 | 1 |
 CS1 |6       11| /Y4        | 1 | 0  |  0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
 /Y7 |7       10| /Y5        | 1 | 0  |  0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 |
 GND |8        9| /Y6        | 1 | 0  |  0 | . | . | . | 1 | 1 | . | 1 |
     +----------+            | 1 | 0  |  0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
                             +---+----+----+---+---+---*---+---+---+---+

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74HCT157
  
Quad 2-input multiplexer / data selector.

    +---+--+---+
SEL |1  +--+ 16| VCC
 A0 |2       15| /OE
 B0 |3       14| A3
 Y0 |4  157  13| B3
 A1 |5       12| Y3
 B1 |6       11| A2
 Y1 |7       10| B2
GND |8        9| Y2
    +----------+

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74HCT259
  
8-bit addressable latch with reset / 1-of-8 decoder.

    +---+--+---+             +---+----*--------------------+
 A0 |1  +--+ 16| VCC         |/EN|/RST| Function           |
 A1 |2       15| /RST        +===+====*====================+
 A2 |3       14| /EN         | 0 |  0 | 1-of-8 demultiplex |
 Y0 |4  259  13| D           | 0 |  1 | addressable latch  |
 Y1 |5       12| Y7          | 1 |  0 | reset              |
 Y2 |6       11| Y6          | 1 |  1 | memory hold        |
 Y3 |7       10| Y5          +---+----*--------------------+
GND |8        9| Y4
    +----------+

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74HCT574
  
8-bit 3-state non-inverting D flip-flop.

    +---+--+---+             +---+---+---*---+
/OE |1  +--+ 20| VCC         |/OE|CLK| D | Q |
 D0 |2       19| Q0          +===+===+===*===+
 D1 |3       18| Q1          | 1 | X | X | Z |
 D2 |4       17| Q2          | 0 | / | 0 | 0 |
 D3 |5  574  16| Q3          | 0 | / | 1 | 1 |
 D4 |6       15| Q4          | 0 |!/ | X | - |
 D5 |7       14| Q5          +---+---+---*---+
 D6 |8       13| Q6
 D7 |9       12| Q7
GND |10      11| CLK
    +----------+

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2816

2k x 8 EEPROM (24-pin), 2048 bytes (16 kilobits).

    +-----+--+-----+
 A7 |1    +--+   24| VCC
 A6 |2           23| A8
 A5 |3           22| A9
 A4 |4           21| /WE
 A3 |5           20| /OE
 A2 |6           19| A10
 A1 |7    2816   18| /CE
 A0 |8           17| D7
 D0 |9           16| D6
 D1 |10          15| D5
 D2 |11          14| D4
GND |12          13| D3
    +--------------+

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2817

2k x 8 EEPROM (28-pin), 2048 bytes (16 kilobits).

Not all manufacturers implement the RDY(/BSY) pin.

    +-----+--+-----+
RDY |1    +--+   28| VCC
    |2           27| /WE
 A7 |3           26|
 A6 |4           25| A8
 A5 |5           24| A9
 A4 |6           23|
 A3 |7    2817   22| /OE
 A2 |8           21| A10
 A1 |9           20| /CE
 A0 |10          19| D7
 D0 |11          18| D6
 D1 |12          17| D5
 D2 |13          16| D4
GND |14          15| D3
    +--------------+

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2864

8k x 8 EEPROM, 8192 bytes (64 kilobits).

Not all manufacturers implement the RDY(/BSY) pin.

    +-----+--+-----+
RDY |1    +--+   28| VCC
A12 |2           27| /WE
 A7 |3           26|
 A6 |4           25| A8
 A5 |5           24| A9
 A4 |6           23| A11
 A3 |7    2864   22| /OE
 A2 |8           21| A10
 A1 |9           20| /CE
 A0 |10          19| D7
 D0 |11          18| D6
 D1 |12          17| D5
 D2 |13          16| D4
GND |14          15| D3
    +--------------+

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28256

32k x 8 EEPROM, 32768 bytes (256 kilobits).

    +-----+--+-----+
A14 |1    +--+   28| VCC
A12 |2           27| /WE
 A7 |3           26| A13
 A6 |4           25| A8
 A5 |5           24| A9
 A4 |6           23| A11
 A3 |7   28256   22| /OE
 A2 |8           21| A10
 A1 |9           20| /CE
 A0 |10          19| D7
 D0 |11          18| D6
 D1 |12          17| D5
 D2 |13          16| D4
GND |14          15| D3
    +--------------+

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Most of these pinout information was grabbed from:
http://www.falstaff.demon.co.uk/GIICM.html

