74ALS244A-1 Datasheet | NXP Semiconductors

FEATURES - Octal bus interface - 3-State buffer outputs sink 24m A and source 15m A - The -1 version sinks 48m A DESCRIPTION The 74ALS244A 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 74ALS244A-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) 17m A 17m A PIN CONFIGURATION OEa 1 Ia0 2 Yb0 3 Ia1 4 Yb1 5 Ia2 6 Yb2 7 Ia3 8 Yb3 9 GND 10 20 VCC 19 OEb 18 Ya0 17 Ib0 16 Ya1 15 Ib1 14 Ya2 13 Ib2 12 Ya3 11 Ib3 SF00227 ORDERING INFORMATION ORDER CODE DESCRIPTION MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C 74ALS244AN, 74ALS244A-1N 74ALS244AD, 744ALS244A-1D 74ALS244ADB, 74ALS244A-1DB DRAWING NUMBER TYPE 74ALS244A 74ALS244A-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 DESCRIPTION Data inputs Output Enable inputs (active-Low) Data outputs Data outputs (-1 version) 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 EN1 EN2 Ia0 1 19 OEa OEb Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3 2 4 6 8 2D 18 16 14 12 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 3 5 7 9 SF00228 SF00229 1991 Feb...