74ALS240A-1 Datasheet | NXP Semiconductors

FEATURES - Octal bus interface - 3-State buffer outputs sink 24m A and source 15m A - The -1 version sinks 48 m A DESCRIPTION The 74ALS240A is an octal buffer that is ideal for driving bus lines or buffer memory address registers. The outputs are all capable of sinking 24m A and sourcing up to 15m A, producing very good capacitive drive characteristics. The device features two output enables, OEa and OEb, each controlling four of the 3-State outputs. The 74ALS240A-1 sinks 48 m A IOL if the VCC is limited to 5.0V ±0.25V. TYPICAL PROPAGATION DELAY 4.5ns 4.5ns TYPICAL SUPPLY CURRENT (TOTAL) 15m A 15m A PIN CONFIGURATION OEa Ia0 Yb0 Ia1 Yb1 Ia2 Yb2 Ia3 Yb3 1 2 3 4 5 6 7 8 9 20 VCC 19 OEb 18 Ya0 17 Ib0 16 Ya1 15 Ib1 14 Ya2 13 Ib2 12 Ya3 11 Ib3 GND 10 SF00320 ORDERING INFORMATION ORDER CODE DESCRIPTION MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C 74ALS240AN, 74ALS240A-1N 74ALS240AD, 74ALS240A-1D 74ALS240ADB, 74ALS240A-1DB DRAWING NUMBER TYPE 74ALS240A 74ALS240A-1 20-pin plastic DIP 20-pin plastic SOL 20-pin plastic SSOP Type II SOT146-1 SOT163-1 SOT339-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS Ian, Ibn OEa, OEb Yan, Ybn Yan, Ybn Data inputs Output Enable inputs (active-Low) Data outputs Data outputs (-1 version) DESCRIPTION 74ALS (U.L.) HIGH/LOW 1.0/1.0 1.0/1.0 750/240 750/480 LOAD VALUE HIGH/LOW 20µA/0.1m A 20µA/0.1m A 15m A/24m A 15m A/48m A NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1m A in the Low state. LOGIC SYMBOL 2 4 6 8 17 15 13 11 IEC/IEEE SYMBOL 1 19 Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3 EN1 EN2 18 16 14 12 2 3 5 7 9 2 4 6 2D 1 19 OEa OEb 8 Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3 17 15 18 VCC = Pin 20 GND = Pin 10 16 14 12 3 5 7 9 13 11 SF00321 SF00322 1991 Feb 08 853- 1244 01670 Philips Semiconductors Product specification Octal inverter buffer (3-State) 74ALS240A/ 74ALS240A-1 LOGIC...