HEF4894BT,118

Shift Registers Overview

The HEF4894BT,118 is a 12-stage serial shift register with storage latches and parallel LED driver outputs. It operates on a recommended VDD supply voltage range of 3 V to 15 V referenced to VSS (ground). Data shifts on positive-going clock transitions, transferring to the storage register when the strobe input is HIGH. The device features two serial outputs for cascading: QS1 provides data on positive-going edges for fast rise times, while QS2 provides data on negative-going edges for slow rise times.

Shift Registers Feature Summary

• CMOS technology providing low power dissipation and high noise immunity
• Fully static operation with standardized symmetrical output characteristics
• ESD protection exceeding 2000 V per HBM standard and 1000 V per CDM standard
• Dual serial outputs enabling flexible cascading for systems with varying clock rise times

Shift Registers Applications

• Serial-to-parallel data converting LED drivers
• Cascaded LED display systems requiring synchronized strobing
• Remote processor control interfaces for lighting arrays

Shift Registers Procurement Notes

Verify the specific ordering suffix matches the required package type. The 'BT' designation indicates an SO20 plastic small outline package (SOT163-1) with a body width of 7.5 mm. Confirm the temperature range requirement aligns with the -40 °C to +125 °C specification provided in the datasheet before finalizing procurement orders.

Shift Registers Selection Notes

Select this component for applications requiring a 12-bit shift-and-store register with open-drain parallel outputs. Ensure the system clock rise time compatibility is addressed by choosing between the QS1 or QS2 serial output based on the transition speed requirements of the cascaded configuration.

Shift Registers Part Context

This part belongs to the Nexperia HEF4894B family of 12-stage shift-and-store registers designed primarily for LED driver applications. The family includes variants such as the HEF4894BTT in a TSSOP20 package. These devices utilize CMOS logic to provide reliable serial-to-parallel conversion with storage capabilities for stable LED illumination control.

Shift Registers Replacement Considerations

HEF4894BTT

Shift Registers FAQ

How does the device handle cascading with different clock speeds?

The HEF4894BT,118 offers two serial outputs to accommodate different clock speeds. QS1 outputs data on positive-going clock edges, suitable for high-speed operation with fast clock rise times. QS2 outputs data on the subsequent negative-going edge, which is used for cascading when the clock has a slow rise time.

What are the ESD protection ratings for this component?

The device complies with JEDEC standards for electrostatic discharge protection. It exceeds 2000 V under the Human Body Model (HBM) test and exceeds 1000 V under the Charged Device Model (CDM) test.