CD74HCT574ME4

高速CMOS逻辑八路D型触发器，三态上升沿触发 High-Speed CMOS Logic Octal D-Type Flip-Flop, 3-State Positive-Edge Triggered

Description

The ’HC374, ’HCT374, ’HC574, and ’HCT574 are octal D-type flip-flops with 3-state outputs and the capability to drive 15 LSTTL loads. The eight edge-triggered flip-flops enter data into their registers on the LOW to HIGH transition of clock CP. The output enable OE controls the 3-state outputs and is independent of the register operation. When OE is HIGH, the outputs are in the high-impedance state. The 374 and 574 are identical in function and differ only in their pinout arrangements.

Features

• Buffered Inputs

• Common Three-State Output Enable Control

• Three-State Outputs

• Bus Line Driving Capability

• Typical Propagation Delay Clock to Q = 15ns at VCC= 5V, CL= 15pF, TA= 25oC

• 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

\- 2-V to 6-V Operation

\- High Noise Immunity: NIL= 30%, NIH= 30% of VCC at VCC= 5V

• HCT Types

\- 4.5-V to 5.5-V Operation

\- Direct LSTTL Input Logic Compatibility, VIL= 0.8V Max, VIH= 2V Min

\- CMOS Input Compatibility, Il ≤1µA at VOL, VOH