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74VHCT138 Datasheet(PDF) 1 Page - STMicroelectronics |
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74VHCT138 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 8 page  74VHCT138A 3 TO 8 LINE DECODER (INVERTING) PRELIMINARY DATA March 2000 s HIGH SPEED: tPD = 7.6 ns (TYP.) at VCC =5V s LOW POWER DISSIPATION: ICC =4 µA (MAX.) at TA =25 oC s COMPATIBLE WITH TTL OUTPUTS: VIH =2V (MIN), VIL = 0.8V (MAX) s POWER DOWN PROTECTION ON INPUTS & OUTPUTS s SYMMETRICAL OUTPUT IMPEDANCE: |IOH|=IOL = 8 mA (MIN) s BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL s OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V s PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 138 s IMPROVED LATCH-UP IMMUNITY s LOW NOISE: VOLP = 0.8V (Max.) DESCRIPTION The 74VHCT138A is an advanced high-speed CMOS 3 TO 8 LINE DECODER (INVERTING) fabricated with sub-micron silicon gate and double-layer metal wiring C 2MOS technology. If the device is enabled, 3 binary select inputs (A, B and C) determine which one of the outputs will go low. If enable input G1 is held low or either G2A or G2B is held high, the decoding function is inhibited and all the 8 outputs go to high. Three enable inputs are provided to ease cascade connection and application of address decoders for memory systems. Power down protection is provided on all inputs and outputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage. This device can be used to interface 5V to 3V. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS ® SOP TSSOP ORDER CODES PACKAGE T UBE T & R SOP 74VHCT138AM 74VHCT138AMTR TSSOP 74VHCT138ATTR 1/8 |
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