NXP Semiconductors 74LV4094DB,112

Overview

74LV4094DB,112 from Nexperia is an 8-bit serial-in/parallel-out shift-and-store bus register with independent shift and storage clocks, 3-state outputs, dual serial outputs (QS1, QS2) for daisy-chaining, and operation across 1.0 V to 3.6 V supply. It performs serial-to-parallel data conversion in microcontroller peripheral expansion and remote I/O systems, with propagation delays as low as 17 ns at 3.3 V and 15 pF load.

For engineers reviewing the 74LV4094DB,112 datasheet, 74LV4094DB,112 pinout, 74LV4094DB,112 application, or 74LV4094DB,112 equivalent, key selection criteria include its dual-edge cascading capability (QS1 on CP↑, QS2 on CP↓), -40 °C to +125 °C industrial temperature range, 3-state output control via OE, and SO16 (SOT109-1) package compatibility with legacy PCB footprints.

Technical Context

The device implements two synchronous register stages: an 8-stage shift register clocked on CP rising edges, and a parallel storage latch triggered by STR high. Data flows serially through D → QP0–QP7, then transfers atomically to outputs only when STR is asserted - decoupling shift timing from output update timing.

Its dual serial outputs provide deterministic cascading: QS1 delivers shifted data on the same CP↑ edge used for shifting (suitable for fast-clock domains), while QS2 presents the same data on the subsequent CP↓ edge (enabling robust inter-device synchronization under slower or noisy clock edges).

Key Specifications

Pinout & Package

74LV4094DB,112 uses the SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit shift-and-store register applications.

Compared with 74LV595D,112, the 74LV4094DB,112 provides deterministic dual-edge output staging for robust multi-device synchronization; versus SN74HC595PWR, it offers true 1.0 V operation and pin-compatible SO16 footprint but sacrifices 5 V tolerance and higher drive strength.

Availability

74LV4094DB,112 is available at Aetrix Electronics and suitable for industrial automation interfaces, LED display controllers, and microcontroller peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LV4094DB,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LV logic family targets low-voltage, low-power applications across 1.0 V to 3.6 V operation, emphasizing signal integrity, ESD robustness, and industrial temperature resilience - specifically engineered for embedded control and interface expansion.

FAQ

What is the function of the STR input, and how does it differ from the CP clock?

The STR (strobe) input transfers data from the 8-bit shift register into the parallel storage register independently of the CP clock. While CP advances bits through the shift register on each rising edge, STR acts as an asynchronous latch enable: asserting STR HIGH captures the current shift register state into the storage register, which then appears at QP0–QP7 outputs when OE is HIGH. This separation allows serial loading at one rate and parallel output update at another - critical for synchronized multi-register systems.

Can QS1 and QS2 be used simultaneously in a single daisy-chain configuration?

Yes - QS1 and QS2 are designed for simultaneous use in cascaded topologies. QS1 feeds the D input of the next device on the same CP↑ edge, enabling minimal latency chaining; QS2 feeds a second downstream device on the subsequent CP↓ edge, providing phase-aligned data for systems requiring matched setup/hold margins across stages. This dual-output architecture eliminates external inverters or delay elements needed to generate complementary clock phases for reliable multi-stage propagation.

Does the 74LV4094DB,112 support hot insertion or live bus connection?

No - the device lacks explicit hot-swap protection features such as power-on reset, I²C-style bus arbitration, or slew-rate controlled outputs. Its inputs include clamp diodes, allowing limited overvoltage tolerance when current-limited, but connecting or disconnecting while powered risks latch-up or transient-induced corruption of internal register states. For live-insertion scenarios, external isolation circuitry (e.g., series resistors + TVS diodes) and controlled power sequencing are required.

How does the 3-state OE control interact with the storage register contents?

The OE (output enable) input controls only the output drivers - it has no effect on the internal shift or storage registers. When OE is LOW, QP0–QP7 enter high-impedance state regardless of stored data; when OE returns HIGH, the previously latched values from the storage register reappear immediately at the outputs. This behavior enables safe bus sharing: multiple 74LV4094DB,112 devices can share a common data bus, with only one enabled via OE at any time, while all retain their respective stored states.