a line
Copyright74203 - 74598copyright

LM/CD 74400 series TTL IC's: 74423 to 74598


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These "LS" chips are basically low power drain CMOS versions of the TTL range.
Please note, we do not stock all the listed chips on this page, however we can
order these in, depending on availability, "lead" times. These useful 74LSxxx building
blocks of logic IC's function are on lower voltages, eg: typically from 4.5V ~ 5.6V D.C.

Email us :sales@unitechelectronics.com



    74423
  Dual retriggerable monostable multivibrator with over-riding reset.
  NOTE: This device Cannot be triggered via a reset input.
         +---+--+---+
    /1TR |1  +--+ 16| VCC
     1TR |2       15| 1RCext
   /1RST |3       14| 1Cext
     /1Q |4   74  13| 1Q
      2Q |5  423  12| /2Q
   2Cext |6       11| /2RST
  2RCext |7       10| 2TR
     GND |8        9| /2TR
         +----------+

    74465   8-bit 3-state noninverting buffer/line driver.

       +---+--+---+
  /OE1 |1  +--+ 20| VCC
    A1 |2       19| /OE2
    Y1 |3       18| A8
    A2 |4       17| Y8
    Y2 |5  74   16| A7
    A3 |6  465  15| Y7
    Y3 |7       14| A6
    A4 |8       13| Y6
    Y4 |9       12| A5
   GND |10      11| Y5
       +----------+

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    74490   Dual 4-bit asynchronous decade counters with set ( 9 ) and reset.

        +---+--+---+
  /1CLK |1  +--+ 16| VCC
   1RST |2       15| /2CLK
    1QA |3       14| 2RST
   1SET |4   74  13| 2Q0
    1QB |5  490  12| 2SET
    1QC |6       11| 2Q1
    1QD |7       10| 2Q2
    GND |8        9| 2Q3
        +----------+
    74519   8-bit open-collector noninverting identity comparator with enable.
      +---+--+---+
  /OE |1  +--+ 20| VCC
   A0 |2       19| A=B
   B0 |3       18| B7
   A1 |4       17| A7
   B1 |5   74  16| B6
   A2 |6  519  15| A6
   B2 |7       14| B5
   A3 |8       13| A5
   B3 |9       12| B4
  GND |10      11| A4
      +----------+

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    74520   8-bit inverting identity comparator with integrated 20k pull-up
  resistors and enable.

      +---+--+---+
  /EN |1  +--+ 20| VCC
   A0 |2       19| A=B
   B0 |3       18| B7
   A1 |4       17| A7
   B1 |5   74  16| B6
   A2 |6  520  15| A6
   B2 |7       14| B5
   A3 |8       13| A5
   B3 |9       12| B4
  GND |10      11| A4
      +----------+

    74521   8-bit inverting identity comparator with enable.

      +---+--+---+
  /OE |1  +--+ 20| VCC
   A0 |2       19| A=B
   B0 |3       18| B7
   A1 |4       17| A7
   B1 |5   74  16| B6
   A2 |6  521  15| A6
   B2 |7       14| B5
   A3 |8       13| A5
   B3 |9       12| B4
  GND |10      11| A4
      +----------+

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    74533   8-bit 3-state inverting transparent latch.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE| LE| D | Q |
  /Q1 |2       19| /Q8         +===+===+===*===+
   D1 |3       18| D8          | 1 | X | X | Z |
   D2 |4       17| D7          | 0 | 0 | X | - |
  /Q2 |5   74  16| /Q7         | 0 | 1 | 0 | 0 |
  /Q3 |6  533  15| /Q6         | 0 | 1 | 1 | 1 |
   D3 |7       14| D6          +---+---+---*---+
   D4 |8       13| D5
  /Q4 |9       12| /Q5
  GND |10      11| LE
      +----------+

    74534   8-bit 3-state inverting D flip-flop.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE|CLK| D |/Q |
  /Q1 |2       19| /Q8         +===+===+===*===+
   D1 |3       18| D8          | 1 | X | X | Z |
   D2 |4       17| D7          | 0 | / | 0 | 1 |
  /Q2 |5   74  16| /Q7         | 0 | / | 1 | 0 |
  /Q3 |6  534  15| /Q6         | 0 |!/ | X | - |
   D3 |7       14| D6          +---+---+---*---+
   D4 |8       13| D5
  /Q4 |9       12| /Q5
  GND |10      11| CLK
      +----------+

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    74540   8-bit 3-state inverting buffer/line driver.

       +---+--+---+
  /OE1 |1  +--+ 20| VCC
    A1 |2       19| /OE2
    A2 |3       18| /Y1
    A3 |4       17| /Y2
    A4 |5   74  16| /Y3
    A5 |6  540  15| /Y4
    A6 |7       14| /Y5
    A7 |8       13| /Y6
    A8 |9       12| /Y7
   GND |10      11| /Y8
       +----------+

    74541   8-bit 3-state noninverting buffer/line driver.

      +---+--+---+
  /OE1 |1  +--+ 20| VCC
    A1 |2       19| /OE2
    A2 |3       18| Y1
    A3 |4       17| Y2
    A4 |5   74  16| Y3
    A5 |6  541  15| Y4
    A6 |7       14| Y5
    A7 |8       13| Y6
    A8 |9       12| Y7
   GND |10      11| Y8
       +----------+

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    74543   8-bit 3-state noninverting registered transceiver.

        +---+--+---+
  /LEBA |1  +--+ 24| VCC
   /GBA |2       23| /CEBA
     A1 |3       22| B1
     A2 |4       21| B2
     A3 |5       20| B3
     A4 |6   74  19| B4
     A5 |7  543  18| B5
     A6 |8       17| B6
     A7 |9       16| B7
     A8 |10      15| B8
  /CEAB |11      14| /LEAB
    GND |12      13| /GAB
        +----------+

    74544   8-bit 3-state inverting registered transceiver.

        +---+--+---+
  /LEBA |1  +--+ 24| VCC
   /GBA |2       23| /CEBA
     A1 |3       22| B1
     A2 |4       21| B2
     A3 |5       20| B3
     A4 |6   74  19| B4
     A5 |7  544  18| B5
     A6 |8       17| B6
     A7 |9       16| B7
     A8 |10      15| B8
  /CEAB |11      14| /LEAB
    GND |12      13| /GAB
        +----------+

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    74561   4-bit 3-state synchronous binary counter with sync / async
  load, sync / async reset, and ripple / clocked carry output.

        +---+--+---+
   /ALD |1  +--+ 20| VCC
    CLK |2       19| RCO
     P0 |3       18| CCO
     P1 |4       17| /OE
     P2 |5   74  16| Q0
     P3 |6  561  15| Q1
    ENP |7       14| Q2
  /ARST |8       13| Q3
  /SRST |9       12| ENT
    GND |10      11| /SLD
        +----------+

    74563   8-bit 3-state inverting transparent latch.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE| LE| D |/Q |
   D1 |2       19| /Q1         +===+===+===*===+
   D2 |3       18| /Q2         | 1 | X | X | Z |
   D3 |4       17| /Q3         | 0 | 0 | X | - |
   D4 |5   74  16| /Q4         | 0 | 1 | 0 | 1 |
   D5 |6  563  15| /Q5         | 0 | 1 | 1 | 0 |
   D6 |7       14| /Q6         +---+---+---*---+
   D7 |8       13| /Q7
   D8 |9       12| /Q8
  GND |10      11| LE
      +----------+

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    74564   8-bit 3-state inverting D flip-flop.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE|CLK| D |/Q |
   D1 |2       19| /Q1         +===+===+===*===+
   D2 |3       18| /Q2         | 1 | X | X | Z |
   D3 |4       17| /Q3         | 0 | / | 0 | 1 |
   D4 |5   74  16| /Q4         | 0 | / | 1 | 0 |
   D5 |6  564  15| /Q5         | 0 |!/ | X | - |
   D6 |7       14| /Q6         +---+---+---*---+
   D7 |8       13| /Q7
   D8 |9       12| /Q8
  GND |10      11| CLK
      +----------+

    74568   4-bit 3-state synchronous decade up/down counter with load,
  sync / async reset and ripple / clocked carry output.

        +---+--+---+
   U//D |1  +--+ 20| VCC
    CLK |2       19| /RCO
     P0 |3       18| /CCO
     P1 |4       17| /OE
     P2 |5   74  16| Q0
     P3 |6  568  15| Q1
   /ENP |7       14| Q2
  /ARST |8       13| Q3
  /SRST |9       12| /ENT
    GND |10      11| /LOAD
        +----------+

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    74569   4-bit 3-state synchronous binary up/down counter with load,
  sync / async reset and ripple / clocked carry output.

        +---+--+---+
   U//D |1  +--+ 20| VCC
    CLK |2       19| /RCO
     P0 |3       18| /CCO
     P1 |4       17| /OE
     P2 |5   74  16| Q0
     P3 |6  569  15| Q1
   /ENP |7       14| Q2
  /ARST |8       13| Q3
  /SRST |9       12| /ENT
    GND |10      11| /LOAD
        +----------+

    74573   8-bit 3-state transparent latch.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE| LE| D |/Q |
   D1 |2       19| Q1          +===+===+===*===+
   D2 |3       18| Q2          | 1 | X | X | Z |
   D3 |4       17| Q3          | 0 | 0 | X | - |
   D4 |5   74  16| Q4          | 0 | 1 | 0 | 0 |
   D5 |6  573  15| Q5          | 0 | 1 | 1 | 1 |
   D6 |7       14| Q6          +---+---+---*---+
   D7 |8       13| Q7
   D8 |9       12| Q8
  GND |10      11| LE
      +----------+

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    74574   8-bit 3-state D flip-flop.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE|CLK| D | Q |
   D1 |2       19| Q1          +===+===+===*===+
   D2 |3       18| Q2          | 1 | X | X | Z |
   D3 |4       17| Q3          | 0 | / | 0 | 0 |
   D4 |5   74  16| Q4          | 0 | / | 1 | 1 |
   D5 |6  574  15| Q5          | 0 |!/ | X | - |
   D6 |7       14| Q6          +---+---+---*---+
   D7 |8       13| Q7
   D8 |9       12| Q8
  GND |10      11| CLK
      +----------+

    74575   8-bit 3-state D flip-flop with reset.

       +---+--+---+            +----+---+---+---*---+
  /RST |1  +--+ 24| VCC        |/RST|/OE|CLK| D | Q |
   /OE |2       23|            +====+===+===+===*===+
    D1 |3       22| Q1         |  0 | 1 | X | X | Z |
    D2 |4       21| Q2         |  X | 0 | X | X | 0 |
    D3 |5       20| Q3         |  1 | 0 | / | 0 | 0 |
    D4 |6   74  19| Q4         |  1 | 0 | / | 1 | 1 |
    D5 |7  575  18| Q5         |  1 | 0 |!/ | X | - |
    D6 |8       17| Q6         +----+---+---+---*---+
    D7 |9       16| Q7
    D8 |10      15| Q8
       |11      14| CLK
   GND |12      13|
       +----------+

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    74576   8-bit 3-state inverting D flip-flop.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE|CLK| D |/Q |
   D1 |2       19| /Q1         +===+===+===*===+
   D2 |3       18| /Q2         | 1 | X | X | Z |
   D3 |4       17| /Q3         | 0 | / | 0 | 1 |
   D4 |5   74  16| /Q4         | 0 | / | 1 | 0 |
   D5 |6  576  15| /Q5         | 0 |!/ | X | - |
   D6 |7       14| /Q6         +---+---+---*---+
   D7 |8       13| /Q7
   D8 |9       12| /Q8
  GND |10      11| CLK
      +----------+

    74577   8-bit 3-state inverting D flip-flop with reset.

       +---+--+---+            +----+---+---+---*---+
  /RST |1  +--+ 24| VCC        |/RST|/OE|CLK| D |/Q |
   /OE |2       23|            +====+===+===+===*===+
    D1 |3       22| /Q1        |  0 | 1 | X | X | Z |
    D2 |4       21| /Q2        |  X | 0 | X | X | 1 |
    D3 |5       20| /Q3        |  1 | 0 | / | 0 | 1 |
    D4 |6   74  19| /Q4        |  1 | 0 | / | 1 | 0 |
    D5 |7  577  18| /Q5        |  1 | 0 |!/ | X | - |
    D6 |8       17| /Q6        +----+---+---+---*---+
    D7 |9       16| /Q7
    D8 |10      15| /Q8
       |11      14| CLK
   GND |12      13|
       +----------+

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    74580   8-bit 3-state inverting transparent latch.

      +---+--+---+             +---+---+---*---+
  /OE |1  +--+ 20| VCC         |/OE| LE| D |/Q |
   D1 |2       19| /Q1         +===+===+===*===+
   D2 |3       18| /Q2         | 1 | X | X | Z |
   D3 |4       17| /Q3         | 0 | 0 | X | - |
   D4 |5   74  16| /Q4         | 0 | 1 | 0 | 1 |
   D5 |6  580  15| /Q5         | 0 | 1 | 1 | 0 |
   D6 |7       14| /Q6         +---+---+---*---+
   D7 |8       13| /Q7
   D8 |9       12| /Q8
  GND |10      11| LE
      +----------+

    74589   8-bit 3-state parallel-in serial-out shift register with input registers.
  Independent clocks for shift and storage registers.

      +---+--+---+
   P1 |1  +--+ 16| VCC
   P2 |2       15| P0
   P3 |3       14| D
   P4 |4   74  13| SH//LD
   P5 |5  589  12| RCLK
   P6 |6       11| SCLK
   P7 |7       10| /OE
  GND |8        9| Q7
      +----------+

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    74590   8-bit 3-state synchronous binary counter with reset and output registers.
  Separate clocks for both counter and storage register, ripple carry output.

      +---+--+---+
   Q1 |1  +--+ 16| VCC
   Q2 |2       15| Q0
   Q3 |3       14| /OE
   Q4 |4   74  13| RCLK
   Q5 |5  590  12| /CLKEN
   Q6 |6       11| CCLK
   Q7 |7       10| /CRST
  GND |8        9| /RCO
      +----------+

    74592   8-bit synchronous binary counter with input registers.
  Separate clocks for counter and input register.
  Counter outputs only internally connected but ripple carry
  and clock outputs are available.

      +---+--+---+
   P1 |1  +--+ 16| VCC
   P2 |2       15| P0
   P3 |3       14| /CLOAD
   P4 |4   74  13| RCLK
   P5 |5  592  12| /CLKEN
   P6 |6       11| CCLK
   P7 |7       10| /CRST
  GND |8        9| /RCO
      +----------+

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    74593   8-bit 3-state synchronous binary counter with input registers and ripple carry
  and clock outputs. Separate clocks for counter and input registers are available.

       +---+--+---+
    P0 |1  +--+ 20| VCC
    P1 |2       19| OE
    P2 |3       18| /OE
    P3 |4       17| /RCLKEN
    P4 |5   74  16| RCLK
    P5 |6  593  15| CLKEN
    P6 |7       14| /CLKEN
    P7 |8       13| CCLK
  /CLD |9       12| /CRST
   GND |10      11| /RCO
       +----------+

    74594   8-bit serial-in parallel-out shift register with output registers and two asynchronous
  resets. Independent clocks and resets for shift and storage registers.

      +---+--+---+
   Y1 |1  +--+ 16| VCC
   Y2 |2       15| Y0
   Y3 |3       14| A
   Y4 |4   74  13| /RRST
   Y5 |5  594  12| RCLK
   Y6 |6       11| SCLK
   Y7 |7       10| /SRST
  GND |8        9| Q7
      +----------+

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    74595   8-bit 3-state serial-in parallel-out shift register with output registers and
  asynchronous reset. Independent clocks for shift and storage registers.

      +---+--+---+
   Y1 |1  +--+ 16| VCC
   Y2 |2       15| Y0
   Y3 |3       14| A
   Y4 |4   74  13| /OE
   Y5 |5  595  12| RCLK
   Y6 |6       11| SCLK
   Y7 |7       10| /RST
  GND |8        9| Q7
      +----------+

    74596   8-bit open-collector serial-in parallel-out shift register with output registers
  and asynchronous reset. Independent clocks for shift and storage registers.

      +---+--+---+
   Y1 |1  +--+ 16| VCC
   Y2 |2       15| Y0
   Y3 |3       14| D
   Y4 |4   74  13| /OE
   Y5 |5  596  12| RCLK
   Y6 |6       11| SCLK
   Y7 |7       10| /RST
  GND |8        9| Q7
      +----------+

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    74597    8-bit parallel-in serial-out shift register with input registers and
  asynchronous reset. Independent clocks for shift and storage registers.

      +---+--+---+
   P1 |1  +--+ 16| VCC
   P2 |2       15| P0
   P3 |3       14| D
   P4 |4   74  13| SH//LD
   P5 |5  597  12| RCLK
   P6 |6       11| SCLK
   P7 |7       10| /RST
  GND |8        9| Q7
      +----------+

    74598   8-bit 3-state shift register with input registers, asynchronous
  reset and selectable serial input.
  Independent clocks for shift and storage registers.

         +---+--+---+
      P0 |1  +--+ 20| VCC
      P1 |2       19| S
      P2 |3       18| D
      P3 |4       17| E
      P4 |5   74  16| /OE
      P5 |6  598  15| RCLK
      P6 |7       14| /SCE
      P7 |8       13| SCLK
  SH//LD |9       12| /RST
     GND |10      11| Q7
         +----------+


" DISCLAIMER "


We believe the above information to be correct, however,  typographical errors 
can occur and it is for this very reason, we provide the above information "as is" 
with "no Warranty" as to "correctness" nor to its "accuracy". Please, always 
check  with your " own data books "  or via a "Google" search on the net.
Please notify us if you have discovered a typographical error and we will fix it.
 E. &. O. E.
This page was upgraded January 31st 2013