74LVX594MTR

Shift Registers Overview

The STMicroelectronics 74LVX594MTR is a low voltage CMOS 8-bit shift register with an output register, fabricated using sub-micron silicon gate and double-layer metal wiring C2MOS technology. It features high-speed performance with a typical propagation delay of 5.5 ns at VCC = 3.3V. The device includes 5V tolerant inputs, allowing operation with input voltages up to 5.5V while the supply voltage ranges from 2V to 3.6V. It offers low power dissipation with a maximum quiescent current of 4 µA at 25°C and symmetrical output impedance with minimum drive currents of 4 mA for both high and low states.

Shift Registers Feature Summary

• Contains an 8-bit serial-in, parallel-out shift register feeding an 8-bit D-type storage register with separate clocks and direct overriding clear inputs.
• Features 5V tolerant inputs that accept 0 to 7V without regard to supply voltage, enabling safe interfacing between 5V and 3V systems.
• Includes power down protection on all inputs and outputs, ensuring no excessive current flows during power-off states.
• Provides ESD immunity of 2 kV on all inputs and outputs against static discharge and transient excess voltage.

Shift Registers Applications

• Low power, battery operated electronic designs
• Low noise 3.3V logic applications
• Interfacing 5V logic signals to 3V system environments

Shift Registers Procurement Notes

Verify the specific package type required for your design, as the MTR suffix indicates SOP-16 packaging, distinct from the TTR variant which uses TSSOP-16. Confirm that the operating temperature range of -55°C to 125°C meets your environmental specifications. Ensure input voltage levels do not exceed the absolute maximum ratings to prevent damage. Check for any recent product change notices regarding pinout or electrical characteristics before finalizing procurement.

Shift Registers Selection Notes

Select this component when designing circuits requiring an 8-bit shift register with independent storage control in a low voltage environment. It is suitable for applications needing high speed (5.5 ns typical) combined with low power consumption. Consider its 5V tolerance if interfacing with legacy 5V logic sources. Verify that the SOP-16 package fits your PCB layout constraints compared to the available TSSOP-16 alternative.

Shift Registers Part Context

This part belongs to the 74LVX series of low voltage CMOS logic devices manufactured by STMicroelectronics. It is functionally compatible with the standard 74HC594 but optimized for lower supply voltages and improved power efficiency. The device utilizes advanced sub-micron technology to achieve high speed while maintaining low static power dissipation, making it a modern replacement for older high-voltage logic families in portable and battery-powered devices.

Shift Registers Replacement Considerations

The 74LVX594TTR serves as a direct functional substitute with identical electrical characteristics, differing only in the TSSOP-16 package instead of the SOP-16 used by the MTR variant. Other 74LVX594 equivalents from different manufacturers may be considered if they meet the same voltage, speed, and pinout requirements.

Shift Registers FAQ

Can the 74LVX594MTR interface directly with 5V logic outputs?

Yes, the device features 5V tolerant inputs that can accept input voltages up to 5.5V, allowing it to safely interface with 5V logic systems even when powered by a lower voltage supply.

What is the difference between the SCK and RCK inputs?

SCK is the clock input for the 8-bit shift register, while RCK is the clock input for the 8-bit storage register. They operate independently, allowing data to be shifted into the register and then stored in the output register separately.

How does the device handle power-down conditions?

The 74LVX594MTR includes power down protection on all inputs and outputs. This ensures that no excessive current flows through the device when the supply voltage is removed or below the operating threshold.