TC74ACT240,244P/F/FT TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74ACT240P, TC74ACT240F, TC74ACT240FT TC74ACT244P, TC74ACT244F, TC74ACT244FT Octal Bus Buffer TC74ACT240P, TC74ACT244P TC74ACT240P/F/FT Inverted, 3-State Outputs TC74ACT244P/F/FT Non-Inverted, 3-State Outputs The TC74ACT240 and 244 are advanced high speed CMOS OCTAL BUS BUFFERs fabricated with silicon gate and 2 double-layer metal wiring C MOS technology. TC74ACT240F, TC74ACT244F They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The 74ACT240 is an inverting 3-state buffer while the 74ACT244 is non-inverting. Both devices have two active-low output enables. These devices are designed to be used in such applications as 3-state memory address drivers. All inputs are equipped with protection circuits against static discharge or transient excess voltage. TC74ACT240FT, TC74ACT244FT Features High speed: t = 5.0 ns (typ.) at V = 5 V pd CC Low power dissipation: I = 8 A (max) at Ta = 25C CC Compatible with TTL outputs: V = 0.8 V (max) IL V = 2.0 V (min) IH Symmetrical output impedance: I = I = 24 mA (min) OH OL Capability of driving 50 Weight transmission lines. DIP20-P-300-2.54A : 1.30 g (typ.) Balanced propagation delays: t t SOP20-P-300-1.27A : 0.22 g (typ.) pLH pHL TSSOP20-P-0044-0.65A : 0.08 g (typ.) Pin and function compatible with 74F240/244 Start of commercial production 1988-10 1 2014-03-01 TC74ACT240,244P/F/FT Pin Assignment TC74ACT240 TC74ACT244 1 G 1 20 V 1G 1 20 V CC CC 1A1 2 19 2G 1A1 2 19 2G 2 Y4 18 1Y1 2Y4 18 1Y1 3 3 1A2 4 17 2A4 1A2 4 17 2A4 2 Y3 5 16 1Y2 2Y3 5 16 1Y2 1A3 6 15 2A3 1A3 6 15 2A3 2 Y2 7 14 1Y3 2Y2 7 14 1Y3 1A4 8 13 2A2 1A4 8 13 2A2 2 Y1 9 12 1Y4 2Y1 9 12 1Y4 GND 10 11 2A1 GND 10 11 2A1 (top view) (top view) IEC Logic Symbol TC74ACT240 TC74ACT244 (1) (1) 1G EN 1G EN (2) (18) (2) (18) 1A1 1Y1 1A1 1Y1 (4) (16) (4) (16) 1A2 1Y2 1A2 1Y2 (6) (14) (6) (14) 1A3 1Y3 1A3 1Y3 (8) (12) (8) (12) 1A4 1Y4 1A4 1Y4 (19) (19) 2G EN 2G EN (11) (9) (11) (9) 2A1 2Y1 2A1 2Y1 (13) (7) (13) (7) 2A2 2Y2 2A2 2Y2 (15) (5) (15) (5) 2A3 2Y3 2A3 2Y3 (17) (3) (17) (3) 2A4 2Y4 2A4 2Y4 Truth Table Inputs Outputs G A Y (244) Y (240) n n n L L L H L H H L H X Z Z X: Dont care Z: High impedance 2 2014-03-01