STMicroelectronics 74LCX573TTR Octal Latch

The 74LCX573TTR from STMicroelectronics is a high-performance, octal D-type transparent latch designed for 2V to 3.6V V<sub>CC operation. This device is part of STMicroelectronics' 74LCX family, which is renowned for its low voltage operation and low noise characteristics, making it an ideal choice for interfacing with high-speed microprocessors and microcontrollers in mixed 3.3V/5V systems.

The 74LCX573TTR features eight latches with 3-state outputs for bus-oriented applications. Each latch is D-type, meaning it captures the state of the data input on a rising-edge clock transition and retains that state until another clock pulse occurs. The 3-state outputs ensure that the latches can be connected directly to a bus, allowing multiple devices to share the same bus lines without interference.

One of the key attributes of the 74LCX573TTR is its 5V tolerant inputs, which allow the use of this device in mixed-voltage environments without the need for additional level shifting. This makes it particularly useful for modern low-voltage applications that need to interface with legacy 5V systems.

The device also boasts a high drive capability, with outputs that can sink or source up to 24 mA. This high drive strength provides reliable operation in the presence of capacitive loads or when driving LEDs. Additionally, the 74LCX573TTR has a power-down high impedance on inputs and outputs, which helps to minimize power consumption when the device is not in active use.

For improved performance, the 74LCX573TTR incorporates bus-hold circuitry on the data inputs, which eliminates the need for external pull-up or pull-down resistors and simplifies board design. The latch also features a latch enable (LE) input that controls the transparent operation of the latch. When LE is high, the outputs follow the inputs, and when LE is low, the outputs retain their previous state.

Offered in a TSSOP20 package, the 74LCX573TTR is designed for surface-mount technology, allowing for compact PCB design and efficient use of board space. The device's specifications and reliable performance make it a versatile component for a wide range of digital logic applications, including communication interfaces, data buffering, and peripheral driving.

In summary, the STMicroelectronics 74LCX573TTR is a robust, low-voltage octal latch with versatile features that make it a smart choice for designers looking to optimize their digital systems.