TC74LCX257F/FN/FT/FK TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74LCX257F,TC74LCX257FN,TC74LCX257FT,TC74LCX257FK Low-Voltage Quad 2-Channel Multiplexer (3-state) with 5-V Tolerant Inputs and Outputs Note: xxxFN (JEDEC SOP) is not available in Japan. The TC74LCX257 is a high-performance CMOS multiplexer. TC74LCX257F Designed for use in 3.3-V systems, it achieves high-speed operation while maintaining the CMOS low-power dissipation. The device is designed for low-voltage (3.3 V) V applications, CC but it could be used to interface to 5-V supply environment for inputs. It is composed of four independent 2-channel multiplexers with common select and 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. TC74LCX257FN All inputs are equipped with protection circuits against static discharge. Features Low-voltage operation: V = 2.0 to 3.6 V CC High-speed operation: t = 6.0 ns (max) (V = 3.0 to 3.6 V) pd CC Output current: I /I = 24 mA (min) (V = 3.0 V) OH OL CC Latch-up performance: 500 mA TC74LCX257FT Available in JEDEC SOP, JEITA SOP, TSSOP and VSSOP(US) Power-down protection provided on all inputs and outputs Pin and function compatible with the 74 series (74AC/VHC/HC/F/ALS/LS etc.) 257 type TC74LCX257FK Weight SOP16-P-300-1.27A : 0.18 g (typ.) SOL16-P-150-1.27 : 0.13 g (typ.) TSSOP16-P-0044-0.65A : 0.06 g (typ.) VSSOP16-P-0030-0.50 : 0.02 g (typ.) 1 2011-03-04 TC74LCX257F/FN/FT/FK Pin Assignment (top view) IEC Logic Symbol (15) OE EN SELECT 1 16 V CC (1) 1A 2 15 SELECT G1 OE (2) 1B 3 14 4A 1A 1 (4) MUX (3) 1Y 1B 1 1Y 4 13 4B (5) 2A (7) (6) 2Y 2A 5 12 4Y 2B (11) 3A (9) (10) 3Y 2B 6 11 3A 3B (14) 4A (12) 2Y 7 10 3B (13) 4Y 4B GND 8 9 3Y Truth Table Inputs Outputs 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 1 SELECT 2 1A 4 3 1Y 1B 5 2A 7 6 2Y 2B 11 3A 9 10 3Y 3B 14 4A 12 13 4Y 4B 15 OE 2 2011-03-04