74VHC9595FT

Shift Registers Overview

The Toshiba 74VHC9595FT is an advanced high-speed 8-bit shift register/latch fabricated with silicon gate C2MOS technology. It combines low power consumption of CMOS with Schottky TTL speeds. The device operates within a supply voltage range of 2.0 V to 5.5 V and supports a maximum clock frequency of 224 MHz at 5.0 V. It features balanced propagation delays, input hysteresis for noise immunity, and power-down protection on all inputs. The component is housed in a TSSOP16B package and complies with AEC-Q100 reliability requirements.

Shift Registers Feature Summary

• Shift operation occurs on the positive-going transition of the SCK input, while the output register loads on the positive-going transition of the RCK input, allowing parallel outputs to remain stable during shifting.
• All inputs feature hysteresis between positive-going and negative-going thresholds to square up slowly changing signals and improve noise immunity.
• Inputs include a newly developed protection circuit without diodes returned to VCC, enabling tolerance to up to 5.5 volts even when the power supply is down.
• Contains negative-edge-triggered flip-flops to improve timing margins affected by long wires or slowly changing clocks when multiple parts are cascaded.

Shift Registers Applications

• Serial-to-parallel conversion
• Data receivers
• Interfacing between different voltages
• Voltage translation from 5 V to 3 V
• Battery back-up circuits

Shift Registers Procurement Notes

Verify that the specific order matches the 74VHC9595FT part number and TSSOP16B package configuration. Confirm compliance with AEC-Q100 reliability standards if automotive application is intended. Ensure design accounts for the specified operating temperature range and absolute maximum ratings to maintain device integrity.

Shift Registers Selection Notes

Select this component for applications requiring high-speed serial-to-parallel conversion with low power dissipation. The wide operating voltage range and power-down protection make it suitable for systems involving voltage translation or battery backup scenarios. Consider the negative-edge-triggered flip-flops for improved timing margins in cascaded configurations.

Shift Registers Part Context

The 74VHC9595FT belongs to the 74VHC logic family, which offers advanced high-speed performance comparable to Schottky TTL while maintaining CMOS low power characteristics. It is a variant of the TC74HC/VHC/AHC/LV595 series, specifically designed to enhance timing margins in complex digital systems.

Shift Registers Replacement Considerations

The datasheet identifies the 74VHC9595FT as a variant of the TC74HC/VHC/AHC/LV595 series. Verify functional compatibility and pinout alignment before substituting with other members of this family.

Shift Registers FAQ

How does the 74VHC9595FT handle input signals when the power supply is down?

The device includes power-down protection on all inputs via a newly developed protection circuit without diodes returned to VCC, allowing inputs to tolerate up to 5.5 volts even when the power supply is off.

What triggers the loading of data into the output register?

The output register is loaded with the contents of the shift register on the positive-going transition of the RCK (Register Clock) input.