1-of-8 Decoder with 3-State Output
(Previous ADE-205-397 (Z))
The HD74AC538 decoder/demultiplexer accepts three Address (A0 to A2) input signal and decodes them to select one
of eight mutually exclusive outputs. A polarity control input (P) determines whether the outputs are active LOW or
active HIGH. A HIGH signal on either of the active LOW output Enable (OE) inputs forces all outputs to the high
impedance state. Two active HIGH and two active LOW input enables are available for easy expansion to 1-of-32
decoding with four packages, or for data demultiplexing to 1-of-8 or 1-of-16 destinations.
• Output Polarity Control
• Data Demultiplexing Capability
• Multiple Enables for Expansion
• Outputs Source/Sink 24 mA
• Ordering Information
Package Type Package Code Package Abbreviation Taping Abbreviation (Quantity)
HD74AC538FPEL SOP-20 pin (JEITA) FP-20DAV
EL (2,000 pcs/reel)
HD74AC538RPEL SOP-20 pin (JEDEC) FP-20DBV
EL (1,000 pcs/reel)
Notes: 1. Please consult the sales office for the above package availability.
2. The packages with lead-free pins are distinguished from the conventional products by adding V at the end of
the package code.
Rev.2.00, Jul.16.2004, page 1 of 7