IS 9414 : Part 1 : Sec 4 : 1979 Detail specification for digital integrated circuits: Part 1 Nand gate, TTL, Sec 4 Quad 2 input, positive
  
      | UDC 621.3.049.77 : 621.3.037.37 |   LTD 5 | 
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    | Reaffirmed 2021 | 
  1. Scope - Covers two types of NAND gates based on their operating temperature range and other electrical characteristics ( Type I* and Type 2-f ) are covered by this standard.   
1.1 Refer to IS: 7441 (Part I )-1974 ’ Essential ratings and characteristics of digital integrated circuits: Part I General format ‘.   
1.2 The assigned type number shall be prominently displayed on the device.