74AC74TTR

Overview

The STMicroelectronics 74AC74TTR is a dual D-type positive edge-triggered flip-flop featuring asynchronous Set and Clear inputs. It operates within a supply voltage range of 2 V to 6 V, supporting high-speed data transfer with a maximum clock frequency of 250 MHz. The device provides complementary outputs (Q and Q) and offers robust output drive capabilities with source/sink currents of 24 mA. Packaged in a 14-pin TSSOP format, it ensures reliable performance across an extended temperature range from -55°C to +125°C.

Feature Summary

• Dual D-type flip-flops with positive edge triggering for precise timing control
• Asynchronous Set and Clear inputs independent of the clock signal
• High-speed operation supporting up to 250 MHz clock frequencies
• Strong output drive capability with 24 mA source and sink current

Applications

• Parallel-to-serial data conversion circuits
• Shift register configurations for data storage
• Timing delay elements in digital logic systems
• State machine implementation in embedded controllers

Procurement Notes

Verify the specific ordering suffix 'TTR' corresponds to the intended tape-and-reel packaging configuration. Confirm that the component meets RoHS compliance requirements for your manufacturing process. Ensure the selected package variant matches your PCB footprint design constraints. Check for any recent product change notifications regarding pinout or electrical characteristics updates.

Selection Notes

Select this component when dual independent D-type storage elements are required in a compact surface-mount package. Consider its 2 V to 6 V operating range for compatibility with various logic families. Evaluate the 24 mA output drive strength against load requirements. Verify that the asynchronous control inputs align with system reset and set logic needs.

Part Context

This part belongs to the 74AC series of high-speed CMOS logic devices, offering significant speed improvements over standard 74LS counterparts while maintaining low power consumption. The AC series is designed for applications requiring fast propagation delays and wide operating voltage ranges. As a dual flip-flop, it serves as a fundamental building block for sequential logic circuits in digital electronics.

Replacement Considerations

Direct substitutes include SN74AC74N from Texas Instruments and MC74AC74DWG from onsemi. These alternatives offer similar electrical characteristics and functionality. Verify pin compatibility and package dimensions before substitution. Ensure that the replacement part supports the same voltage and temperature specifications.