Functional Description

• Octal Bus Buffer

74VHCT240AFT: INVERTED, 3-STATE OUTPUTS

74VHCT244AFT: NON-INVERTED, 3-STATE OUTPUTS

General

The 74VHCT240AFT and 74VHCT244AFT are advanced high speed CMOS OCTAL BUS BUFFERs fabricated

with silicon gate C2MOS technology. They achieve the high speed operation similar to equivalent Bipolar Schottky

TTL while maintaining the CMOS low power dissipation.

The 74VHCT240AFT is an inverting 3-state buffer having two active-low output enables. The 74VHCT244AFT

is a non-inverting 3-state buffer, and has two active-low output enables.

These devices are designed to be used with 3-state memory address drivers, etc.

The input voltage are compatible with TTL output voltage.

These devices may be used as a level converter for interfacing 3.3 V to 5 V system.

Input protection and output circuit ensure that 0 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, hot board insertion, etc.

Note: Output in off-state

Features

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

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

(3) High speed: Propagation delay time = 6.1 ns (typ.) at VCC = 5.0 V

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

(5) Compatible with TTL input: 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 = 1.0 V (max)

(9) Pin and function compatible with the 74 series

(ACT/HCT/AHCT etc.) 240/244 type.