DESCRIPTION
The 74VHCT139A is an advanced high-speed CMOS DUAL 2 TO 4 LINE DECODER/DEMULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.
The active low enable input can be used for gating or as a data input for demultiplexing applications. When the enable input is held high, all four outputs are high independently of the other inputs.

■ HIGH SPEED: tPD = 5 ns (TYP.) at VCC = 5V
■ LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C
■ COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX)
■ POWER DOWN PROTECTION ON INPUTS & OUTPUTS
■ SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN)
■ BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL
■ OPERATING VOLTAGE RANGE: VCC(OPR) = 4.5V to 5.5V
■ PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 139
■ IMPROVED LATCH-UP IMMUNITY