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HD74AC138TELL Datasheet(PDF) 4 Page - Renesas Technology Corp |
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HD74AC138TELL Datasheet(HTML) 4 Page - Renesas Technology Corp |
4 / 12 page HD74AC138/HD74ACT138 Rev.2.00, Jul.16.2004, page 2 of 9 Logic Symbol A0 A1 A2 E1 O0 O1 O2 O3 O4 O5 O6 O7 E2 E3 Pin Names A 0 to A2 Address Inputs E 1 to E 2 Enable Inputs E 3 Enable Input O 0 to O 7 Outputs Functional Description The HD74AC138/HD74ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A 0, A1, A 2) and, when enabled, provides eight mutually exclusive active-LOW outputs (O0 to O7). The HD74AC138/HD74ACT138 features three Enable inputs, two active-Low ( E 1, E2) and one active-High (E3). All outputs will be High unless E 1 and E2 are Low and E3 is High. This multiple enabled function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four HD74AC138/HD74ACT138 devices and one inverter (See Figure a). The HD74AC138/HD74ACT138 can be used as an 8-output demultiplexer by using one of the active Low Enable inputs as the data input and the other Enable inputs as strobes. The Enables inputs which are not used must be permanently tied to their appropriate active-High or active-Low state. Truth Table Inputs Outputs E EE E 1 E EE E 2 E 3 A 0 A 1 A 2 O O O O 0 O O O O 1 O O O O 2 O O O O 3 O O O O 4 O O O O 5 O O O O 6 O O O O 7 H XX XXXH HHHH HHH X H X XXXH HHHH HHH X XL XXXH HHHH HHH L LH LLLL HHHH HHH L L H H L L H L HHH HHH L L H L H L HH L H HH H H L L H H H L H HHL H HHH L L H L L H H HHHL HHH L L H H L H H HHHH L HH L L H L H H H HHHH HL H L L H HHHH HHHH HHL H : High Voltage Level L : Low Voltage Level X : Immaterial |
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