Functional Description

? Octal Bus Transceiver

General

The 74VHCT245AFT is an advanced high speed CMOS OCTAL BUS TRANSCEIVER fabricated with silicon

gate C2MOS 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.

The input voltage are compatible with TTL output voltage.

This device may be used as a level converter for interfacing 3.3 V to 5 V system.

Input protection and output circuit ensure that 0 V to 5.5 V can be applied to the input and output (Note) pins

without regard to the supply voltage. These structure prevents device destruction due to mismatched supply and

input/output voltages such as battery back up, etc.

Note: Output in off-state

Features (Note)

(1) AEC-Q100 (Rev. H) (Note 1)

(2) Wide operating temperature : Topr = -40  to 125 

(3) High speed: Propagation delay time = 4.9 ns (typ.) at VCC = 5.0 V

(4) Quiescent supply current: ICC = 4.0 μA (max) at Ta = 25 

(5) Compatible with TTL inputs: VIL = 0.8 V (max)

VIH = 2.0 V (min)

(6) Power-down protection is provided on all inputs and outputs

(7) Balanced propagation delays: tPLH ≈ tPHL

(8) Low noise: VOLP = 1.5 V (max)

(9) Pin and function compatible with the 74 series (74ACT/HCT/AHCT etc.) 245 type.