74F240A Datasheet | Philips Semiconductors

FEATURES - Octal bus interface - 3-State buffer outputs sink 64m A - 15m A source current - Guaranteed output skew less than 2.0ns (74F240A/74F241A) - Reduced ground bounce (74F240A/74F241A) DESCRIPTION The 74F240 and 74F241 are octal buffers that are ideal for driving bus lines of buffer memory address registers. The outputs are all capable of sinking 64m A and sourcing up to 15m A. The device features two output enables, each controlling four of the 3- state outputs. The 74F240A and 74F241A are functionally equivalent to their non- A counterparts. They have been designed to reduce effects of ground noise. Other advantages are noted in the features . - Reduced ICC (74F241A only) - Reduced loading (74F240A IIL = 100µA, 74F241A IIL = 40µA) TYPE 74F240 74F240A 74F241 74F241A TYPICAL PROPAGATION DELAY 4.3ns 3.8ns 5.0ns 4.5ns TYPICAL SUPPLY CURRENT (TOTAL) 37m A 40m A 53m A 32m A ORDERING INFORMATION ORDER CODE DESCRIPTION 20- pin plastic DIP 20- pin plastic SOL 20-pin plastic SSOP II MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F240N, N74F240AN, N74F241N, N74F241AN N74F240D, N74F240AD, N74F241D, N74F241AD N74F240DB PKG DWG # SOT146-1 SOT163-1 SOT339-1 INPUT AND OUTPUT LOADING AND FAN OUT TABLE PINS Data inputs (74F240) Ian, Ibn Data inputs (74F240A) Data inputs (74F241) Data inputs (74F241A) OEa, OEb Output enable inputs (active low) (74F240) Output enable inputs (active low) (74F240A) OEa, OEb Output enable input (74F241) Output enable input (74F241A) Yan, Ybn Data outputs (74F241, 74F241A) DESCRIPTION 74F (U.L.) HIGH/LOW 1.0/1.67 1.0/0.167 1.0/2.67 1.0/0.067 1.0/0.33 1.0/0.167 1.0/1.67 1.0/0.067 750/106.7 750/106.7 LOAD VALUE HIGH/LOW 20µA/1.0m A 20µA/100µA 20µA/1.6m A 20µA/40µA 20µA/0.2m A 20µA/100µA 20µA/1.0m A 20µA/40µA 15m A/64m A 15m A/64m A Yan, Ybn Data outputs (74F240, 74F240A) Note to input and output loading and fan out table One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6m A in the low state. January 2, 1991 853- 0355 01345 Philips...