74F1240 Datasheet | NXP Semiconductors

INTEGRATED CIRCUITS 74F1240 Octal inverter buffer (3-State) 74F1241 Octal buffer (3-State)- - Discontinued part. Please see the Discontinued Product List. Product specification Supercedes data of 1989 Apr 04 IC15 Data Handbook 1999 Jan 08 Philips Semiconductors Philips Semiconductors Product specification Buffers Features 74F1240, 74F1241- Octal inverter buffer (3-State) TYPICAL PROPAGATION DELAY 3.5ns 4.5ns TYPICAL SUPPLY CURRENT (TOTAL) 40m A 46m A - High impedance NPN base inputs for reduced loading (20µA in High and Low states) TYPE 74F1240 74F1241 - Low power, light loading - Functional pin-for-pin equivalent of 74F240 and 74F241 - 1/30th the bus loading of 74F240 and 74F241 - Provides ideal interface and increase fan-out of MOS microprocessors ORDERING INFORMATION DESCRIPTION 20-pin plastic DIP 20-pin plastic SOL MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F1240N N74F1240D DRAWING NUMBER SOT146-1 SOT163-1 - Octal bus interface - 3-State buffer outputs sink 64m A - 15m A source current DESCRIPTION The 74F1240 and 74F1241 are octal buffers that are ideal for driving bus lines or buffer memory address registers. The outputs are capable of sinking 64m 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. INPUT AND OUTPUT LOADING AND FAN OUT TABLE PINS Ian, Ibn OEa, OEb OEb Yan, Ybn Yan, Ybn Data inputs Output enable inputs (active Low) Output enable input (active High, 74F1241) Data outputs (74F1241) Data outputs (74F1240) DESCRIPTION 74F (U.L.) HIGH/LOW 1.0/0.033 1.0/0.033 1.0/0.033 750/106.7 750/106.7 LOAD VALUE HIGH/LOW 20µA/20µA 20µA/20µA 20µA/20µA 15m A/64m A 15m A/64m A NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6m A in the Low...