74F2240 Datasheet | Philips Semiconductors

FEATURES - Octal bus interface - 30Ω output termination ideal for driving DRAM - 15m A source current DESCRIPTION The 74F2240 and 74F2241 are octal buffers that are ideal for driving dynamic DRAM with impedance matching. The outputs are all capable of sinking 5m A and sourcing up to 15m A. The device features two output enables, each controlling four of the 3-state outputs. TYPICAL PROPAGATION DELAY 4.3ns 4.5ns TYPICAL SUPPLY CURRENT (TOTAL) 37m A 30m A PIN CONFIGURATION 74F2240 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 SF00561 TYPE 74F2240 74F2241 LOGIC SYMBOL 74F2240 2 4 6 8 17 15 13 11 ORDERING INFORMATION ORDER CODE DESCRIPTION MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F2240N, N74F2241N N74F2240D, N74F2241D PKG DWG # 1 19 Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3 OEa OEb Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3 20-pin plastic DIP 20-pin plastic SOL SOT146-1 SOT163-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS Ian, Ibn OEa, OEb OEb Yan, Ybn DESCRIPTION Data inputs Output enable inputs (active Low) Output enable input (74F2241) Data outputs (74F2241) 74F (U.L.) HIGH/LOW 1.0/0.33 1.0/0.33 1.0/0.33 750/8.33 LOAD VALUE HIGH/LOW 20µA/0.2m A 20µA/0.2m A 20µA/0.2m A 15m A/5m A 18 16 14 12 VCC = Pin 20 GND = Pin 10 SF00562 IEC/IEEE SYMBOL 74F2240 1 19 EN1 EN2 2 4 6 8 17 15 13 11 2 18 16 14 12 3 5 7 9 2D Yan, Ybn Data outputs (74F2240) 750/8.33 15m A/5m A NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6m A in the Low state. SF00563 December 13, 1990 853-1524 01255 Philips Semiconductors Product specification Octal...