Nexperia USA Inc. 74HC299D,653

Overview

74HC299D,653 from Nexperia is an 8-bit universal shift register with 3-state outputs, implementing synchronous shift-left, shift-right, parallel load, and hold functions via mode-select inputs S0/S1. It features edge-triggered D-type flip-flops, asynchronous master reset (MR), dual 3-state output enables (OE1/OE2), and cascading capability via Q0/DSR and Q7/DSL pins. Used in bus-oriented digital systems requiring flexible data routing and temporary storage.

For engineers reviewing the 74HC299D,653 datasheet, 74HC299D,653 pinout, 74HC299D,653 application, or 74HC299D,653 equivalent, key selection criteria include propagation delay at 4.5 V (24 ns typ), 3-state output drive capability (±35 mA), operating temperature range (−40 °C to +125 °C), and SO20 package compatibility with high-density PCB layouts.

Technical Context

The 74HC299D,653 implements a synchronous 8-bit shift register using CMOS logic with four distinct functional modes controlled by S0 and S1: parallel load (S0=H, S1=H), shift-right (S0=L, S1=H), shift-left (S0=H, S1=L), and hold (S0=L, S1=L). All state changes occur on the rising edge of CP, except for MR which asynchronously resets all flip-flops to LOW.

Its I/O0–I/O7 pins serve as bidirectional 3-state buffers-acting as parallel inputs during load mode and as tristatable outputs otherwise-while Q0 and Q7 provide serial expansion points. Output enable is active-LOW on OE1/OE2, and 3-state disable also occurs when both S0 and S1 are HIGH prior to load.

Key Specifications

Pinout & Package

74HC299D,653 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width, optimized for surface-mount assembly and thermal performance up to 125 °C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC165DR and 74HC595PW,118, the 74HC299D,653 uniquely supports full bidirectional shifting, parallel load with hold retention, and 3-state bus compatibility - making it the only choice for reconfigurable data-path architectures requiring runtime mode switching and bus arbitration.

Availability

74HC299D,653 is available at Aetrix Electronics and suitable for industrial automation controllers, test equipment pattern generators, LED matrix drivers, and microcontroller peripheral expansion requiring stable component supply across extended temperature ranges.

Supply support for 74HC299D,653 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 delivering high-performance, reliable logic, analog, and MOSFET solutions with emphasis on efficiency, miniaturization, and robustness for industrial and automotive markets.

The 74HC299 belongs to Nexperia's HC-series high-speed CMOS logic family, designed specifically for low-power, noise-immune digital interfacing and data manipulation in space-constrained, thermally demanding embedded systems.

FAQ

What is the maximum clock frequency supported by the 74HC299D,653?

The 74HC299D,653 supports a maximum clock frequency of 45 MHz (typical) at VCC = 4.5 V and 20 MHz (minimum) over the full −40 °C to +125 °C operating range. This is derived from its 24 ns typical propagation delay (CP to Q) and verified in Table 7 of the datasheet under dynamic characteristics.

Can the 74HC299D,653 operate at 3.3 V supply voltage?

Yes - the 74HC299D,653 is fully specified for VCC = 2.0 V to 6.0 V, including 3.3 V operation. At 3.3 V, propagation delay increases to approximately 32 ns (interpolated from 2.0 V and 4.5 V data), and output drive strength remains sufficient for 3.3 V CMOS/TTL loads per VIH/VIL and VOH/VOL specifications.

How does the asynchronous master reset (MR) interact with the 3-state outputs?

The MR pin resets all internal flip-flops to LOW but does not affect the 3-state output buffer state. Outputs remain in their prior enabled/disabled condition (determined by OE1/OE2 and S0/S1) - meaning MR can clear data while preserving bus isolation or driving state, enabling safe reset without bus contention.

Is the 74HC299D,653 pin-compatible with older 74HC299 variants in SO20 package?

Yes - the 74HC299D,653 uses the SOT163-1 (SO20) package with identical pinout and electrical specifications as prior revisions of the 74HC299 in the same package. Pin assignments, function table, and AC/DC characteristics match Rev. 7 datasheet, ensuring drop-in replacement in existing designs.