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MM54HC299 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM54HC299 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 6 page  TLF5207 January 1988 MM54HC299MM74HC299 8-Bit TRI-STATE Universal Shift Register General Description This 8-bit TRI-STATE shiftstorage register utilizes advanced silicon-gate CMOS technology Along with the low power consumption and high noise immunity of standard CMOS integrated circuits it has the ability to drive 15 LS-TTL loads This circuit also features operating speeds compara- ble to the equivalent low power Schottky device The MM54HC299MM74HC299 features multiplexed in- putsoutputs to achieve full 8-bit data handling in a single 20-pin package Due to the large output drive capability and TRI-STATE feature this device is ideally suited for interfac- ing with bus lines in a bus oriented system Two function select inputs and two output control inputs are used to choose the mode of operation as listed in the func- tion table Synchronous parallel loading is accomplished by taking both function select lines S0 and S1 high This places the TRI-STATE outputs in a high impedance state which permits data applied to the inputoutput lines to be clocked into the register Reading out of the register can be done while the outputs are enabled in any mode A direct overrid- ing CLEAR input is provided to clear the register whether the outputs are enabled or disabled The 54HC74HC logic family is functionally as well as pinout compatible with the standard 54LS74LS logic family All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground Features Y Typical operating frequency 40 MHz Y Typical propagation delay 20 ns Y Low quiescent current 80 mA maximum (74HC) Y High output drive for bus applications Y Low quiescent current 1 mA maximum Connection Diagram Dual-In-Line Package TLF5207 1 Order Number MM54HC299 or MM74HC299 TRI STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD B30M105Printed in U S A |
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