View m74hc243 datasheet:

M74HC243 QUAD BUS TRANSCEIVER (3 - STATE) HIGH SPEED: tPD = 11ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC = 4µA(MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28 % VCC (MIN.) DIP SOP TSSOP SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 6mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ? tPHL ORDER CODES WIDE OPERATING VOLTAGE RANGE: PACKAGE TUBE T & R VCC (OPR) = 2V to 6V DIP M74HC243B1R PIN AND FUNCTION COMPATIBLE WITH SOP M74HC243M1R M74HC243RM13TR 74 SERIES 243 TSSOP M74HC243TTR DESCRIPTION The M74HC243 is an high speed CMOS QUAD enable high speed operation when driving large BUS TRANSCEIVER (3-STATE) fabricated with bus capacitance. The device has one active high silicon gate C2MOS technology. enable (GBA), and one active low enable (GAB) The M7