TC74ACT257F(F) Toshiba

TC74ACT257P/F TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74ACT257P, TC74ACT257F 2-Channel Multiplexer (3-state) TC74ACT257P The TC74ACT257 is an advanced high speed CMOS MULTIPLEXER fabricated with silicon gate and double-layer 2 metal wiring C MOS technology. It achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. This device may be used as a level converter for interfacing TTL or NMOS to High Speed CMOS. The inputs are compatible with TTL or NMOS and CMOS output voltage levels. Each is composed of four independent 2-channel multiplexers TC74ACT257F with common SELECT and OUTPUT ENABLE ( OE ). If OE is set low, the outputs are held in a high-impedance state. When SELECT is set low, A data inputs are enabled. Conversely, when SELECT is high, B data inputs are enabled. All inputs are equipped with protection circuits against static discharge or transient excess voltage. Features High speed: t = 5.8 ns (typ.) at V = 5 V pd CC Weight Low power dissipation: I = 8 A (max) at Ta = 25C CC DIP16-P-300-2.54A : 1.00 g (typ.) Compatible with TTL outputs: V = 0.8 V (max) IL SOP16-P-300-1.27A : 0.18 g (typ.) V = 2.0 V (min) IH Symmetrical output impedance: I = I = 24 mA (min) OH OL Capability of driving 50 transmission lines. Balanced propagation delays: t t pLH pHL Pin and function compatible with 74F257 Pin Assignment Start of commercial production 1988-10 1 2014-03-01 TC74ACT257P/F IEC Logic Symbol Truth Table Inputs Output OE SELECT A B Y H X X X Z L L L X L L L H X H L H X L L L H X H H X: Dont care Z: High impedance System Diagram 2 2014-03-01