Nexperia USA Inc. 74HC590BQ,115

Overview

74HC590BQ,115 from Nexperia is an 8-bit binary counter with integrated storage register and 3-state outputs, used for synchronous counting and buffered data latching in digital timing and control systems. It features independent counter clock (CPC) and register clock (CPR) inputs, master reset (MRC), count enable (CE), and ripple carry output (RCO) for cascading. Operates from 2.0 V to 6.0 V across -40 °C to +125 °C.

For engineers reviewing the 74HC590BQ,115 datasheet, 74HC590BQ,115 pinout, 74HC590BQ,115 application, or 74HC590BQ,115 equivalent, key selection factors include dual-clock synchronization, RCO-based cascade capability, 3-state output control via OE, and DHVQFN16 thermal-enhanced packaging for high-density PCB layouts.

Technical Context

The device implements two synchronized but functionally decoupled stages: an 8-bit binary counter with MRC and CE control, and a parallel-output storage register triggered by CPR. The RCO output asserts low when all eight counter bits are high (Q0–Q7 = 1), enabling direct daisy-chaining without external logic.

Its 3-state outputs are controlled by an active-low OE input, allowing bus sharing in multi-device systems. Internal clamp diodes permit safe interfacing with voltages exceeding VCC when used with current-limiting resistors - a critical feature for mixed-voltage system integration.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, 16-terminal no-lead thermal-enhanced quad flat layout with exposed thermal pad (non-soldered or GND-connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040D,653, the 74HC590BQ,115 provides deterministic read access and bus isolation; compared with SN74LV8154IPW, it offers smaller size, lower cost, and proven thermal performance in DHVQFN16 - ideal for space-constrained industrial counters.

Availability

74HC590BQ,115 is available at Aetrix Electronics and suitable for industrial PLC modules, automotive sensor interfaces, test equipment pattern generation, and smart energy metering requiring stable component supply across extended temperature ranges.

Supply support for 74HC590BQ,115 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 logic, analog, and MOSFET solutions with emphasis on reliability, efficiency, and manufacturability for industrial and automotive markets.

The 74HC590 belongs to Nexperia's HC-series high-speed CMOS logic family, designed specifically for robust, low-power digital counting and data latching in noise-prone industrial environments.

FAQ

Can 74HC590BQ,115 operate reliably at 3.3 V supply?

Yes. The device is fully specified from 2.0 V to 6.0 V, with guaranteed timing and output drive at 3.3 V. Propagation delay is 24 ns (CPR to Qn, -40 °C to +125 °C), and VOH exceeds 3.0 V at IO = -6 mA - meeting standard 3.3 V CMOS input thresholds.

What is the function of the exposed thermal pad on the DHVQFN16 package?

The exposed pad (terminal 1 index area) is electrically isolated and thermally conductive. It may remain floating or be connected to GND to improve thermal dissipation. No soldering is required, but if soldered, the land must not be electrically tied to any signal net other than GND.

How does the RCO output behave during cascading?

RCO goes low when the internal counter reaches 255 (all Q0–Q7 = 1). In cascade mode, it drives the CE input of the next stage. Since CE is active-low, RCO low enables the downstream counter - achieving seamless 16-bit counting without additional logic gates.

Is there setup/hold time requirement between CPC and CPR clocks?

Yes. Data sheet Figure 11 specifies a minimum CPC-to-CPR setup time of 10 ns and hold time of 0 ns at VCC = 6.0 V. This ensures the counter state is stable before the register samples it - critical for avoiding metastability in pipelined operation.