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SN74LS155 Datasheet(PDF) 1 Page - ON Semiconductor |
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SN74LS155 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 4 page © Semiconductor Components Industries, LLC, 2006 June, 2006 − Rev. 7 1 Publication Order Number: SN74LS155/D SN74LS155 DUAL 1-OF-4 DECODER/ DEMULTIPLEXER The SN54 / 74LS156 is a high speed Dual 1-of-4 Decoder/Demultiplexer. This device has two decoders with common 2-bit Address inputs and separate gated Enable inputs. Decoder “a” has an Enable gate with one active HIGH and one active LOW input. Decoder “b” has two active LOW Enable inputs. If the Enable functions are satisfied, one output of each decoder will be LOW as selected by the address inputs. The LS156 has open collector outputs for wired-OR (DOT-AND) decoding and function generator applications. The LS156 is fabricated with the Schottky barrier diode process for high speed and are completely compatible with all Motorola TTL families. • Schottky Process for High Speed • Multifunction Capability • Common Address Inputs • True or Complement Data Demultiplexing • Input Clamp Diodes Limit High Speed Termination Effects • ESD > 3500 Volts CONNECTION DIAGRAM DIP (TOP VIEW) NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Pack- age. 14 13 12 11 10 9 12345 6 7 16 15 8 VCC Ea Eb Eb A0 O3b O1b O2b O0b Ea A1 O3a O2a O1a O0a GND PIN NAMES LOADING (Note a) HIGH LOW A0, A1 Ea, Eb Ea O0−O3 Address Inputs Enable (Active LOW) Inputs Enable (Active HIGH) Input Active LOW Outputs (Note b) 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 5 (2.5) U.L. NOTES: a) 1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. The HIGH level drive for the LS156 must be established by an external resistor. http://onsemi.com DUAL 1-OF-4 DECODER/ DEMULTIPLEXER LS156-OPEN-COLLECTOR LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 16 1 16 1 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXD SOIC 16 1 D SUFFIX SOIC CASE 751B-03 LOGIC SYMBOL VCC = PIN 16 GND = PIN 8 1 2 13 3 14 15 EE A0 A0 A1 A1 012 3 0 123 DECODER a DECODER b 7 6 5 4 9 10 11 12 |
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