74HC194DB,112

Shift Registers Overview

The Nexperia 74HC194DB,112 is a 4-bit bidirectional universal shift register housed in an SSOP16 package (SOT338-1). It operates on a supply voltage range of 2.0 V to 6.0 V and supports synchronous parallel and serial data transfer modes controlled by S0 and S1 inputs. The device features asynchronous master reset, hold mode, and edge-triggered clocking. It complies with JEDEC standards for low power CMOS input levels and offers high noise immunity with ESD protection exceeding 2000 V (HBM) and 200 V (MM). Operating temperatures span from -40 °C to +125 °C.

Shift Registers Feature Summary

• Supports bidirectional shifting via dedicated DSL and DSR serial inputs alongside parallel load capability.
• Includes asynchronous master reset and synchronous hold modes for flexible state control.
• Provides robust ESD protection meeting JESD22-A114F and JESD22-A115-A standards.
• Ensures high noise immunity and latch-up performance compliant with JESD 78 Class II Level B.

Shift Registers Applications

• Data storage and buffering in digital logic circuits
• Serial-to-parallel and parallel-to-serial data conversion
• Bidirectional data transfer between system components

Shift Registers Procurement Notes

Verify the specific ordering suffix '112' corresponds to the SSOP16 package variant when sourcing. Confirm that the required operating temperature range aligns with the specified -40 °C to +125 °C limits. Ensure interface voltages remain within the 2.0 V to 6.0 V supply constraints to maintain signal integrity and prevent damage to the CMOS inputs.

Shift Registers Selection Notes

Select this component when a 4-bit universal shift register with bidirectional capabilities is required. It is suitable for applications needing both serial and parallel data handling within a single IC. Consider the SSOP16 package dimensions if board space is constrained. Verify that the supply voltage environment falls within the 2.0 V to 6.0 V operational window for optimal performance.

Shift Registers Part Context

This part belongs to the 74HC194 family of 4-bit bidirectional universal shift registers manufactured by Nexperia. It utilizes standard CMOS technology designed for general-purpose digital logic applications. The device integrates four flip-flops with control logic to manage shift direction and loading modes, providing a compact solution for sequential data processing tasks.

Shift Registers Replacement Considerations

Check for direct pin-compatible substitutes within the same 74HC logic family. Verify that any replacement maintains the SSOP16 package form factor and identical electrical characteristics, including supply voltage ranges and output drive capabilities, to ensure seamless integration without circuit redesign.

Shift Registers FAQ

How is the shift direction determined?

The shift direction is controlled by the S0 and S1 mode select inputs. Data enters serially via DSL for left shifting or DSR for right shifting based on these logic states.

What triggers the data transfer?

Data transfer is edge-triggered, responding specifically to the LOW-to-HIGH transition of the clock (CP) input. Mode control and data inputs must be stable prior to this transition.

Can existing data be retained without shifting?

Yes, setting both S0 and S1 to LOW places the device in a hold mode, retaining the existing data in the outputs without shifting or loading new values.