TC74AC245,640P/F/FT TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74AC245P, TC74AC245F, TC74AC245FT TC74AC640P, TC74AC640F, TC74AC640FT Octal Bus Transceiver TC74AC245P, TC74AC640P TC74AC245P/F/FT 3-State, Non-Inverting TC74AC640P/F/FT 3-State, Inverting The TC74AC245, 640 are advanced high speed CMOS OCTAL BUS TRANSCEIVERs fabricated with silicon gate and double-layer 2 metal wiring C MOS technology. They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power TC74AC245F, TC74AC640F dissipation. They are intended for two-way asynchronous communication between data busses. The direction of data transmission is determined by the level of the DIR input. The enable input ( G ) can be used to disable the device so that the busses are effectively isolated. All inputs are equipped with protection circuits against static discharge or transient excess voltage. TC74AC245FT, TC74AC640FT Features (Note 1)(Note 2) High speed: t = 3.9 ns (typ.) at V = 5 V pd CC Low power dissipation: I = 8 A (max) at Ta = 25C CC High noise immunity: V = V = 28% V (min) NIH NIL CC Symmetrical output impedance: I = I = 24 mA (min) OH OL Capability of driving 50 transmission lines. Balanced propagation delays: t t pLH pHL Wide operating voltage range: V (opr) = 2 V to 5.5 V CC Weight DIP20-P-300-2.54A : 1.30 g (typ.) Pin and function compatible with 74F245/640 SOP20-P-300-1.27A : 0.22 g (typ.) TSSOP20-P-0044-0.65A : 0.08 g (typ.) Note 1: Do not apply a signal to any bus terminal when it is in the output mode. Damage may result. Note 2: All floating (high impedance) bus terminals must have their input levels fixed by means of pull up or pull down resistors. Start of commercial production 1986-05 1 2014-03-01 TC74AC245,640P/F/FT Pin Assignment TC74AC245 TC74AC640 DIR 1 20 V DIR 1 20 V CC CC A1 2 19 G A1 2 19 G A2 18 B1 A2 18 B1 3 3 A3 4 17 B2 A3 4 17 B2 A4 5 16 B3 A4 5 16 B3 A5 6 15 B4 A5 6 15 B4 A6 7 14 B5 A6 7 14 B5 A7 8 13 B6 A7 8 13 B6 A8 9 12 B7 A8 9 12 B7 GND 10 11 B8 GND 10 11 B8 (top view) (top view) IEC Logic Symbol TC74AC245 TC74AC640 (19) (19) G3 G3 G G (1) (1) DIR 3 EN 1 BA DIR 3 EN 1 BA 3 EN 2 AB 3 EN 2 AB (2) (18) (2) (18) A1 1 B1 A1 1 B1 2 2 (3) (17) (3) (17) A2 B2 A2 B2 (4) (16) (4) (16) A3 B3 A3 B3 (5) (15) (5) (15) A4 B4 A4 B4 (6) (14) (6) (14) A5 B5 A5 B5 (7) (13) (7) (13) A6 B6 A6 B6 (8) (12) (8) (12) A7 B7 A7 B7 (9) (11) (9) (11) A8 B8 A8 B8 2 2014-03-01