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74VHCT257AM bảng dữ liệu(PDF) 1 Page - STMicroelectronics |
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1 / 10 page 74VHCT257A QUAD 2 CHANNEL MULTIPLEXER (3-STATE) PRELIMINARY DATA March 2000 s HIGH SPEED: tPD = 5.8 ns (TYP.) at VCC =5V s LOWPOWER 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 257 s IMPROVED LATCH-UP IMMUNITY s LOWNOISE: VOLP = 0.8V (Max.) DESCRIPTION The 74VHCT257A is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C 2MOS technology. It is composed of four independent 2 channel multiplexers with common SELECT and ENABLE INPUT. The 74VHCT257A is a non inverting multiplexer. When the ENABLE INPUT is held ”High”, all outputs become high impedance state. If SELECT INPUT is held ”Low”, ”A” data is selected, when SELECT INPUT is ”High”, ”B” data is chosen. Power down protection is provided on all inputs and output 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 74VHCT257AM 74VHCT257AMTR TSSOP 74VHCT257ATTR 1/9 |
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