器件名称:
74VHCT257AMTR
功能描述:
QUAD 2 CHANNEL MULTIPLEXER 3-STATE
文件大小:
70.63KB 共10页
简 介:
74VHCT257A QUAD 2 CHANNEL MULTIPLEXER (3-STATE) PRELIMINARY DATA s s s s s s s s s s HIGH SPEED: tPD = 5.8 ns (TYP.) at VCC = 5V LOWPOWER DISSIPATION: ICC = 4 A (MAX.) at TA = 25 oC 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 257 IMPROVED LATCH-UP IMMUNITY LOWNOISE: VOLP = 0.8V (Max.) SOP PACKAGE SOP TSSOP T UBE 74VHCT257AM TSSOP T& R 74VHCT257AMTR 74VHCT257ATTR ORDER CODES 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 C2MOS technology. It is composed of four independent 2 channel multiplexers with common SELECT and ENABLE INPUT. PIN CONNECTION AND IEC LOGIC SYMBOLS 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 exce……
