CD54HC243数据手册TI中文资料规格书

描述 Description

The ’HC243 and ’HCT243 silicon-gate CMOS three-state bidirectional noninverting buffers are intended for two-way asynchronous communication between data buses. They have high-drive-current outputs that enable high-speed operation when driving large bus capacitances. These circuits possess the low power dissipation of CMOS circuits and have speeds comparable to low-power Schottky TTL circuits. They can drive 15 LSTTL loads.

The states of the output-enable (OEB\\, OEA) inputs determine both the direction of flow (A to B, B to A), and the three-state mode.

特性 Features

• Typical Propagation Delay (A to B, B to A) of 7ns at VCC = 5V, CL = 15pF, TA = 25°C
• Three-State Outputs
• Buffered Inputs
• Fanout (Over Temperature Range)
• Standard Outputs . . . 10 LSTTL Loads
• Bus Driver Outputs . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . –55°C to 125°C
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
• 2V to 6V Operation
• High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V

• HCT Types
• 4.5V to 5.5V Operation
• Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
• CMOS Input Compatibility, Il 1µA at VOL, VOH

Data sheet acquired from Harris Semiconductor