The 54FCT573LMQB/QS is an octal transparent latch with tristate outputs manufactured by National Semiconductor, now part of Texas Instruments (TI). It's part of the FCT (Fast CMOS Technology) logic family, offering a high-speed, low-power solution for memory and bus interface applications. The /QS suffix suggests it meets specific military or high-reliability screening requirements. Its primary function is to temporarily store data and drive a bus with its tristate outputs.

Applications

• Memory address latching
• Data buffering
• Bus interface
• High-speed data acquisition systems
• Military and aerospace electronics
• Industrial control systems

Features

• Octal transparent latch
• Tristate outputs
• High-speed operation (FCT logic)
• Low power consumption
• Military temperature range
• TTL compatible inputs
• Available in surface-mount package

Benefits

• Provides temporary data storage, allowing efficient data transfer between different system components.
• Enables bus isolation, preventing data contention and ensuring signal integrity.
• Offers high-speed operation, improving overall system performance.
• Reduces power consumption, extending battery life in portable applications.
• Operates reliably in extreme temperature environments, making it suitable for military and aerospace applications.

Additional Details

The 54FCT573LMQB/QS consists of eight D-type latches with a common enable (LE) input. When LE is high, the outputs (Q0-Q7) follow the data inputs (D0-D7). When LE is low, the outputs latch the data present at the inputs. The output enable (OE) input controls the tristate outputs. When OE is low, the outputs are enabled, and when OE is high, the outputs are in a high-impedance state. The FCT logic family provides significantly faster switching speeds compared to standard CMOS logic, while maintaining low power consumption. The device typically operates from a 5V supply and features TTL-compatible inputs, simplifying interfacing with other logic families.

Typical specifications include: Supply Voltage (VCC) range, Input Voltage levels (VIH, VIL), Output Voltage Levels (VOH, VOL), Propagation Delay Times (tPLH, tPHL), Setup and Hold Times (tsu, th), and Operating Temperature Range. Military grade versions will also have radiation hardness specifications.