SN74ALS533ANSR - Texas Instruments Octal D-Type Transparent Latches with 3-State Outputs

The SN74ALS533ANSR from Texas Instruments is a high-performance, octal D-type transparent latch with 3-state outputs designed for 4.5-V to 5.5-V VCC operation. This integrated circuit is part of the Advanced Low-Power Schottky (ALS) logic family, which offers a balanced trade-off between speed and power consumption, making it suitable for a wide range of applications in industrial, commercial, and telecommunications systems.

This device features eight D-type latches with 3-state outputs in a single package, facilitating the interfacing of bus lines or buffer memory address registers. Each latch is D-type, transparent, and is triggered by a low-to-high transition of the corresponding latch-enable (LE) input, while the output-enable (OE) bar controls the 3-state outputs. When OE is low, the outputs are active and reflect the data present at the input pins. When OE is high, the outputs are in a high-impedance state, which means they neither load the bus nor drive it, allowing for bidirectional data flow across the bus without interference from the latch circuitry.

The SN74ALS533ANSR is housed in a 20-pin SOP (Small Outline Package) that is surface-mountable, making it ideal for space-constrained applications. This IC ensures a glitch-free data output transition from the bus-hold condition, which maintains the last active bus state during a tri-state condition, to the active bus state.

Key features of the SN74ALS533ANSR include:

• Eight D-type transparent latches with 3-state outputs
• Wide operating voltage range of 4.5 V to 5.5 V
• High-impedance state during power-up and power-down
• Direct bus connection when outputs are not active
• Edge-triggered from active-high transition of LE
• Surface-mount SOP-20 package for space-saving applications
• Supports live insertion and withdrawal (bus-oriented devices)
• Typical VOLP (Output Ground Bounce) < 0.8V at VCC = 5V, TA = 25°C

With its robust design and advanced technology, the SN74ALS533ANSR is an excellent choice for implementing latch functions in your digital logic systems, offering both reliability and performance that you can trust.