N74F138D,623 NXP

INTEGRATED CIRCUITS 74F138 1-of-8 decoder/demultiplexer Product specification 1991 Feb 14 IC15 Data Handbook Philips Semiconductors Product specification 1-of-8 decoder/demultiplexer 74F138 FEATURE PIN CONFIGURATION Demultiplexing capability A0 1 16 V CC Multiple input enable for easy expansion A1 2 15 Q0 Ideal for memory chip select decoding A2 3 14 Q1 Industrial temperature range available (40C to +85C) E0 4 13 Q2 E1 5 12 Q3 DESCRIPTION E2 6 11 Q4 The 74F138 decoder accepts three binary weighted inputs (A0, A1, Q7 7 10 Q5 A2) and when enabled, provides eight mutually exclusive, active low outputs (Q0 Q7). The device features three enable inputs two GND 8 9 Q6 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 SF00174 function allows easy parallel expansion of the device to 1-of-32 (5 lines to 32 lines) decoder with just four 74F138s and one inverter (see Figure 1). The device can be used as an eight output TYPICAL TYPICAL demultiplexer by using one of the active low enable inputs as the TYPE PROPAGATION SUPPLY CURRENT data input and the remaining enable inputs as strobes. Enable DELAY (TOTAL) inputs not used must be permanently tied to their appropriate active 74F138 5.8ns 13mA high or active low state. ORDERING INFORMATION ORDER CODE DESCRIPTION PKG DWG COMMERCIAL RANGE INDUSTRIAL RANGE V = 5V 10%, T = 0C to +70C V = 5V 10%, T = 40C to +85C CC amb CC amb 16-pin plastic DIP N74F138N I74F138N SOT38-4 16-pin plastic SO N74F138D I74F138D SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0 A2 Address inputs 1.0/1.0 20A/0.6mA E0, E1 Enable inputs (active Low) 1.0/1.0 20A/0.6mA E2 Enable input (active High) 1.0/1.0 20A/0.6mA Q0 Q7 Data outputs 50/33 1.0mA/20mA NOTE: One (1.0) FAST unit load is defined as: 20A in the High state and 0.6mA in the Low state. LOGIC SYMBOL IEC/IEEE SYMBOL 12 3 DMUX 1 15 0 0 2 14 0 1 G 3 A0 A1 A2 3 13 2 4 E0 2 12 5 E1 3 6 E2 11 4 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 4 10 & 5 5 9 6 15 14 13 12 11 10 9 7 6 7 7 V = Pin 16 CC GND = Pin 8 SF00175 SF00176 2 February 14, 1991 8530343 01719