Nexperia USA Inc. 74HC280D,652

Overview

74HC280D,652 from Nexperia is a 9-bit CMOS odd/even parity generator and checker in SO14 (SOT108-1) package, providing simultaneous PE (even parity) and PO (odd parity) outputs. It operates across 2.0–6.0 V supply, delivers propagation delays as low as 16 ns at 6.0 V, and supports industrial temperature range (−40 °C to +125 °C). Used in data integrity verification for UART, memory controllers, and bus interfaces.

For engineers reviewing the 74HC280D,652 datasheet, 74HC280D,652 pinout, 74HC280D,652 application, or 74HC280D,652 equivalent, key selection criteria include input voltage compatibility (CMOS-level), dual-parity output availability, cascading capability for >9-bit words, and SO14 thermal/power performance under sustained logic switching.

Technical Context

The 74HC280D implements combinational logic that counts HIGH states across nine inputs (I0–I8) and asserts PE high for even count and PO high for odd count - no internal latching or clocking. Its input clamp diodes allow safe interfacing with voltages exceeding VCC when used with current-limiting resistors.

It supports expansion via PE output cascading: up to nine devices feed their PE outputs into a final-stage 74HC280 to generate parity for up to 81-bit words. Static VIH/VIL thresholds scale with VCC (e.g., VIH = 4.2 V min at VCC = 6.0 V), ensuring robust noise immunity across supply variants.

Key Specifications

Pinout & Package

74HC280D,652 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads. Thermal resistance θJA = 100 K/W (typical), suitable for standard PCB reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit parity generation applications.

Compared with 74HC280D,652, the 74HCT280D,653 offers guaranteed TTL-level input compatibility at the cost of reduced noise margin below 4.5 V, while SN74HC280N trades surface-mount efficiency for manual assembly flexibility - neither matches the SO14 thermal performance and automated manufacturability of the original.

Availability

74HC280D,652 is available at Aetrix Electronics and suitable for industrial automation, embedded communications, and memory subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SO14 packaging.

Supply support for 74HC280D,652 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 essential system functionality components, delivering high-performance, reliable, and efficient logic, discrete, and MOSFET solutions.

The 74HC280D,652 belongs to Nexperia's 74HC high-speed CMOS logic family, designed specifically for low-power, noise-immune digital interfacing in industrial, automotive, and computing applications.

FAQ

Can 74HC280D,652 operate at 3.3 V?

Yes. The 74HC280D,652 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH = 2.31 V min and VIL = 1.09 V max per datasheet Table 6, ensuring compatibility with standard 3.3 V CMOS logic families and providing >1.2 V noise margin.

Is the PE output usable for cascading beyond 9 bits?

Yes. The datasheet explicitly defines PE as the cascading signal: up to nine 74HC280D,652 devices can feed their PE outputs into the I0–I8 inputs of a final-stage device to generate parity for an 81-bit word. No additional logic or timing constraints are required beyond meeting setup/hold timing of the final stage.

Does 74HC280D,652 require external pull-up or pull-down resistors?

No. All inputs and outputs are fully buffered CMOS with defined logic states across the full VCC range. Inputs have no weak pull-ups; outputs actively drive HIGH/LOW. External resistors are only needed if interfacing to voltages exceeding VCC (leveraging internal clamp diodes) or for specific bus-termination requirements.

What is the maximum clock/data rate supported?

The device has no clock - it is purely combinational. Maximum effective data rate depends on propagation delay and system timing budget. With tpd = 16 ns (VCC = 6.0 V), it supports reliable parity checking on data edges spaced ≥32 ns apart (setup + hold), enabling use in 31.25 MHz parallel buses with synchronous sampling.