74HCT4094N,112

Shift Registers Overview

The 74HCT4094N,112 is an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports ambient temperatures from -40 °C to +125 °C. The device features separate clocks for the shift and storage registers, along with serial outputs (QS1 and QS2) for cascading. Inputs include clamp diodes to interface with voltages exceeding VCC.

Shift Registers Feature Summary

• Features separate clock inputs for independent operation of the shift and storage registers.
• Provides two serial outputs (QS1 and QS2) to facilitate cascading under varying clock edge speeds.
• Includes input clamp diodes allowing direct interfacing with voltages higher than the supply voltage using current limiting resistors.

Shift Registers Applications

• Serial-to-parallel data conversion
• Remote control holding register

Shift Registers Procurement Notes

Verify that the ordering suffix '112' corresponds to the specified DIP16 plastic dual in-line package (SOT38-4). Confirm the HCT logic family designation ensures TTL-compatible input levels are required for proper functionality. Ensure the application environment remains within the specified -40 °C to +125 °C temperature range.

Shift Registers Selection Notes

Select this component when TTL-level input compatibility is required for an 8-bit shift register application. The HCT series is appropriate for systems operating at 5 V where noise immunity and low power dissipation are necessary. Verify that the DIP16 package format meets the PCB layout requirements.

Shift Registers Part Context

This part belongs to the 74HCT logic family, which provides CMOS performance with TTL-compatible inputs. It is functionally similar to the 74HC4094 but differs in input voltage thresholds. The N suffix indicates a through-hole DIP16 package, distinct from surface-mount variants like the D or DB suffixes.

Shift Registers Replacement Considerations

The 74HCT4094D,118 is a documented substitute offering identical logical functions in a SOIC-16 surface mount package. Designers must account for the physical footprint differences between the DIP16 and SOIC-16 packages during replacement.

Shift Registers FAQ

How does the device handle cascading?

The device includes two serial outputs, QS1 and QS2. QS1 provides data on the positive clock edge for fast edges, while QS2 provides data on the negative clock edge for slow edges, enabling reliable cascading.

Can the inputs be driven by voltages higher than VCC?

Yes, the device features input clamp diodes. This allows the use of current-limiting resistors to interface the inputs to voltages exceeding the VCC supply level.