TC74VHC245FT(EL,K) Toshiba

TC74VHC245F/FT/FK TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74VHC245F,TC74VHC245FT,TC74VHC245FK Octal Bus Transceiver The TC74VHC245 is an advanced high speed CMOS OCTAL 2 BUS TRANSCEIVER fabricated with silicon gate C MOS TC74VHC245F technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. It is 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. TC74VHC245FT All inputs are equipped with protection circuits against static discharge. Features (Note 1) (Note 2) (Note 3) High speed: t = 4.0 ns (typ.) at V = 5 V pd CC Low power dissipation: I = 4 A (max) at Ta = 25C CC High noise immunity: V = V = 28% V (min) NIH NIL CC Balanced propagation delays: t t pLH pHL TC74VHC245FK Wide operating voltage range: V = 2 V to 5.5 V CC (opr) Low noise: V = 1.0 V (max) OLP Pin and function compatible with 74ALS245 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. Weight SOP20-P-300-1.27A : 0.22 g (typ.) Note 3: A parasitic diode is formed between the bus and V CC TSSOP20-P-0044-0.65A : 0.08 g (typ.) terminals. Therefore bus terminal can not be used to VSSOP20-P-0030-0.50 : 0.03 g (typ.) interface 5 V to 3 V systems directly. 1 2009-04-01 TC74VHC245F/FT/FK Pin Assignment IEC Logic Symbol (19) G3 G DIR 1 20 V CC (1) DIR 3 EN 1 BA 3 EN 2 AB A1 2 19 G (2) (18) A2 18 B1 3 A1 1 B1 2 A3 4 17 B2 (3) (17) A2 B2 A4 5 16 B3 (4) (16) A3 B3 A5 6 15 B4 (5) (15) A6 7 14 B5 A4 B4 A7 8 13 B6 (6) (14) A5 B5 A8 9 12 B7 (7) (13) A6 B6 GND 10 B8 11 (8) (12) A7 B7 (top view) (9) (11) A8 B8 Truth Table Inputs Function Output G DIR A Bus B Bus L L Output Input A = B L H Input Output B = A H X Z Z X: Dont care Z: High impedance Absolute Maximum Ratings (Note) Characteristics Symbol Rating Unit Supply voltage range V 0.5 to 7.0 V CC DC input voltage (DIR, G) V 0.5 to 7.0 V IN DC bus I/O voltage V 0.5 to V + 0.5 V I/O CC Input diode current I 20 mA IK Output diode current I 20 mA OK DC output current I 25 mA OUT DC V /ground current I 75 mA CC CC Power dissipation P 180 mW D Storage temperature T 65 to 150 C stg Note: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction. Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook (Handling Precautions/Derating Concept and Methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). 2 2009-04-01