TC74VHCT240AF

The TC74VHCT240AF is a kind of high speed CMOS OCTAL BUS BUFFER with 3-state output fabricated with silicon gate C2MOS technology.  The device reaches the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The device is an inverting 3-state buffer having two active-low output enables. The device is designed to be used with 3-state memory address drivers, etc. The input voltage is compatible with TTL output voltage. In addition, the device may be used as a level converter for interfacing 3.3 to 5 V system. Input protection and output circuit ensure that 0 to 5.5 V can be applied to the input and output pins without regard to the supply voltage.

There are some features of TC74VHCT240AF as follows: (1)high speed: tpd=6.1 ns (typ) at VCC=5 V; (2)low power dissipation: ICC=4A max at Ta=25; (3)compatible with TTL outputs: VIL=0.8 V max, VIH=2.0 V min ; (4)power down protection is provided on all inputs and outputs; (5)balanced propagation delays: tpLHtpHL; (6)low noise: VOLP=1.0 V max; (7)pin and function compatible with the 74 series (74AC/HC/F/ALS/LS etc) 240 type.

The following is about the absolute maximum ratings of TC74VHCT240AF : (1)supply voltage range, VCC: -0.5 to 7.0 V; (2)DC input voltage, VIN: -0.5 to 7.0 V; (3)DC output voltage, VOUT: -0.5 to 7.0 V or -0.5 to VCC+0.5 V; (4)input diode current, IIK: -20 mA; (5)output diode current, IOK: ±20 mA; (6)DC output current, IOUT: ±25 mA ; (7)DC VCC/Ground current, ICC: ±75 mA; (8)power dissipation, PD: 180 mW; (9)storage temperature, Tstg: -65 to 150. Then is about the recommended operating conditions: (1)supply voltage range, VCC: 4.5 to 5.5 V; (2)input voltage, VIN: 0 to 5.5 V; (3)output voltage, VOUT: 0 to 5.5 V or 0 to VCC V; (4)operating temperature, Topr: -40 to 85; (5)input rise and fall time, dt/dv: 0 to 20 ns/V.