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74ALS138D Fiches technique(PDF) 2 Page - NXP Semiconductors |
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74ALS138D Fiches technique(HTML) 2 Page - NXP Semiconductors |
2 / 8 page Philips Semiconductors Product specification 74ALS138 1-of-8 decoder/demultiplexer 2 1996 Jul 03 853–1848 17016 FEATURES • Demultiplexing capability • Multiple input enable for easy expansion • Ideal for memory chip select decoding DESCRIPTION The 74ALS138 decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled, provides eight mutually exclusive, active-Low outputs (Q0 – Q7). The device features three Enable inputs; two active-Low (E0, E1) and one active-High (E2). Every output will be High unless E0 and E1 are Low and E2 is High. This multiple enable function allows easy parallel expansion of the device to 1-of-32 (5 lines to 32 lines) decoder with just four 74ALS138s and one inverter. The device can be used as an eight output demultiplexer by using one of the active-Low Enable inputs as the data input and the remaining Enable inputs as strobes. Enable inputs not used must be permanently tied to their appropriate active-High or active-Low state. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74ALS138 12.0ns 4.0mA PIN CONFIGURATION 16 15 14 13 12 11 10 7 6 5 4 3 2 1 Q7 VCC Q3 Q4 Q5 Q2 Q0 Q1 A0 A1 E2 A2 E0 E1 9 8 GND Q6 SF00174 ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 16-pin plastic DIP 74ALS138N SOT38-4 16-pin plastic SO 74ALS138D SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0 – A2 Address inputs 1.0/1.0 20 µA/0.1mA E0, E1 Enable inputs (active-Low) 1.0/1.0 20 µA/0.1mA E2 Enable input (active-High) 1.0/1.0 20 µA/0.1mA Q0 – Q7 Data outputs (active-Low) 50/33 1.0mA/20mA NOTE: One (1.0) ALS unit load is defined as: 20 µA in the High state and 0.1mA in the Low state. LOGIC SYMBOL A1 A2 A0 Q2 Q3 Q4 Q5 13 12 11 10 12 3 VCC = Pin 16 GND = Pin 8 SF00175 Q1 14 Q0 15 Q6 9 Q7 7 4 5 6 E0 E1 E2 IEC/IEEE SYMBOL SC00047 DX 1 2 4 5 6 15 14 13 12 11 10 9 7 0 0 1 2 G 0 7 3 3 2 & |
Numéro de pièce similaire - 74ALS138D |
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Description similaire - 74ALS138D |
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