TC74VHCT240AFT(E,K Toshiba

TC74VHCT240,244AF/AFT/AFK TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74VHCT240AF,TC74VHCT240AFT,TC74VHCT240AFK TC74VHCT244AF,TC74VHCT244AFT,TC74VHCT244AFK Octal Bus Buffer TC74VHCT240AF/AFT/AFK Inverted, 3-State Outputs TC74VHCT240AF, TC74VHCT244AF TC74VHCT244AF/AFT/AFK Non-Inverted, 3-State Outputs The TC74VHCT240A and 244A are advanced high speed CMOS OCTAL BUS BUFFERs fabricated with silicon gate 2 C MOS technology. They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. TC74VHCT240AFT, TC74VHCT244AFT The TC74VHCT240A is an inverting 3-state buffer having two active-low output enables. The TC74VHCT244A is a non-inverting 3-state buffer, and has two active-low output enables. These devices are designed to be used with 3-state memory address drivers, etc. The input voltage are compatible with TTL output voltage. These devices may be used as a level converter for interfacing 3.3 V to 5 V system. Input protection and output circuit ensure that 0 to 5.5 V can TC74VHCT240AFK, TC74VHCT244AFK (Note) be applied to the input and output pins without regard to the supply voltage. These structure prevents device destruction due to mismatched supply and input/output voltages such as battery back up, hot board insertion, etc. Note: Output in off-state Features High speed: t = 6.1 ns (typ.) at V = 5 V pd CC Weight Low power dissipation: I = 4 A (max) at Ta = 25C CC SOP20-P-300-1.27A: 0.22 g (typ.) Compatible with TTL inputs: V = 0.8 V (max) TSSOP20-P-0044-0.65A: 0.08 g (typ.) IL VSSOP20-P-0030-0.50: 0.03 g (typ.) V = 2.0 V (min) IH Power down protection is provided on all inputs and outputs Balanced propagation delays: t t pLH pHL Low noise: V = 1.0 V (max) OLP Pin and function compatible with the 74 series (74AC/HC/F/ALS/LS etc.) 240/244 type. 1 2008-12-01 TC74VHCT240,244AF/AFT/AFK Pin Assignment TC74VHCT240A TC74VHCT244A 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 TC74VHCT240A TC74VHCT244A (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 An Yn Y n L L L H L H H L H X Z Z X: Dont care Z: High impedance Yn: TC74VHCT244A Y : TC74VHCT240A n 2 2008-12-01