CD74HCT244ME4

高速CMOS逻辑八路缓冲器/线路驱动器，三态 High-Speed CMOS Logic Octal Buffer/Line Drivers, Three-State

Description

The ’HC240 and ’HCT240 are inverting three-state buffers having two active-low output enables. The CD74HC241, ’HCT241, ’HC244 and ’HCT244 are non-inverting three state buffers that differ only in that the 241 has one active high and one active-low output enable, and the 244 has two active-low output enables. All three types have identical pinouts.

Features

• HC/HCT240 Inverting

• HC/HCT241 Non-Inverting

• HC/HCT244 Non-Inverting

• Typical Propagation Delay = 8ns at VCC = 5V, CL = 15pF, TA = 25oC for HC240

• Three-State Outputs

• Buffered Inputs

• High-Current Bus Driver Outputs

• Fanout Over Temperature Range

   - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

   - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• 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