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MC74VHC245-MC74VHC245DTR2
Octal Bus Transceiver
Octal Bus T ransceiver
The MC74VHC245 is an advanced high speed CMOS octal bus
transceiver fabricated with silicon gate CMOS technology. It achieves
high speed operation similar to equivalent Bipolar Schottky TTL
while maintaining CMOS low power dissipation.
It is intended for two–way asynchronous communication between
data buses. The direction of data transmission is determined by the
level of the DIR input. The output enable pin (OE) can be used to
disable the device, so that the buses are effectively isolated.
All inputs are equipped with protection circuits against static
discharge. High Speed: tPD = 4.0ns (Typ) at VCC = 5V Low Power Dissipation: ICC = 4μA (Max) at TA = 25°C High Noise Immunity: VNIH = VNIL = 28% VCC Power Down Protection Provided on Inputs Balanced Propagation Delays Designed for 2V to 5.5V Operating Range Low Noise: VOLP = 1.2V (Max) Pin and Function Compatible with Other Standard Logic Families Latchup Performance Exceeds 300mA ESD Performance: HBM > 2000V; Machine Model > 200V Chip Complexity: 308 FETs or 77 Equivalent Gates
APPLICATION NOTES Do not force a signal on an I/O pin when it is an active output,
damage may occur. All floating (high impedance) input or I/O pins must be fixed by
means of pull up or pull down resistors or bus terminator ICs. A parasitic diode is formed between the bus and VCC terminals.
Therefore, the VHC245 cannot be used to interface 5V to 3V systems
directly.
