= = = = = = = = = = =

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

 . . . . . . . .  . . . . . . . .
 


      Email us :sales@unitechelectronics.com

The TTL building blocks 74400 and 74LS400 series of TTL logic IC's.

-------------------------------------------------------------------------

    ** Click here for TOP of page **


74423
  Dual retriggerable monostable multivibrator with overriding 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
     +----------+


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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
     +----------+


    ** Click here for TOP of page **


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
      +----------+


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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
      +----------+


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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|
     +----------+


    ** Click here for TOP of page **


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|
     +----------+


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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 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
    +----------+


    ** Click here for TOP of page **


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


    ** Click here for TOP of page **


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
    +----------+


    ** Click here for TOP of page **


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.
                                                   E. &. O. E.