- HIGH SPEED tPD = 10 ns (TYP.) at Vcc=5V
- LOW POWER DISSIPATION Icc=4mA(MAX.)at TA =25ºC
- COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.8V (MAX.)
- OUTPUT DRIVE CAPABILITY 15 LSTTL LOADS
- SYMMETRICAL OUTPUT IMPEDANCE |IOH|=IOL = 6 mA (MIN)
- BALANCED PROPAGATION DELAYS tPLH =tPHL
- PIN AND FUNCTION COMPATIBLE WITH 54/74LS245/640/643
Description
The M54/74HCT245, HCT640 and HCT643 utilise silicon gate C2 MOS technology to achive operating speeds eqivalent to LSTTL devices. Along with the low power dissipation and high noise immunity of standad CMOS integrated circuit, it possesses the capability to drive 15 LSTTL loads. These IC’s are intended for two-way asynchronous communication between data buses, and the direction of data trasmission is determined by DIR input. The enable input (G) can be used to disable the device so that the buses are effectively isolated. All input are equipped with protection circuits against static discharge and transient discharge. These integrated circuits have input and output characteristics that are fully compatible with 54/74 LSTTL logic families. M54/74HCT devices are designed to directly interface HSC2 MOS systems with TTL and NMOS components. They are also plug in replacements for LSTTL devices giving a reduction of power consumption.b>It is Prohibited to apply a signal to a bus Terminal when it is in output mode and when a bus Therminal is floating (high impedance state), it is requested to fix the input level by means of external pull down or pull resistor.
