Nexperia USA Inc. 74HC280D,653

Overview

74HC280D,653 from Nexperia is a 9-bit CMOS odd/even parity generator and checker in SO14 package, delivering dual HIGH-active outputs (PE for even, PO for odd) with propagation delays as low as 16 ns at VCC = 6.0 V and CL = 50 pF. It operates across 2.0–6.0 V supply, supports -40 °C to +125 °C ambient range, and enables cascaded parity expansion for wider data words - used in industrial bus controllers and legacy microprocessor data integrity circuits.

For engineers reviewing the 74HC280D,653 datasheet, 74HC280D,653 pinout, 74HC280D,653 application, or 74HC280D,653 equivalent, key selection criteria include input voltage compatibility (CMOS-level), dual-parity output timing symmetry, SO14 thermal derating behavior above 100 °C, and cascade interface requirements using PE outputs of parallel devices.

Technical Context

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

Propagation delay is symmetric between Ix→PE and Ix→PO paths (e.g., 16–34 ns at VCC = 6.0 V), and transition times remain under 19 ns. Power dissipation is governed by CPD = 65 pF and scales quadratically with VCC and switching frequency.

Key Specifications

Pinout & Package

74HC280D,653 uses the SOT108-1 plastic small outline package (SO14), 14-lead, 3.9 mm body width, with standard JEDEC MS-012 footprint and 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC280D,653, the 74HCT280D,653 offers superior input compatibility with legacy TTL but sacrifices some supply flexibility, while the SN74LS280N delivers predictable timing in pure 5 V environments at the cost of power efficiency and temperature range.

Availability

74HC280D,653 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microprocessor memory interfaces, medical diagnostic data acquisition, and avionics ARINC 429 receiver interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC280D,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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC280D belongs to Nexperia's HC logic family - designed for low-power, high-noise-immunity digital interfacing in industrial and embedded systems where reliability and wide supply tolerance are mandatory.

FAQ

Can 74HC280D,653 operate at 3.3 V?

Yes. The 74HC280D,653 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤1.09 V per datasheet Table 6, providing >1.2 V noise margin. Propagation delay increases to ~30 ns (typical) at 3.3 V, which remains compatible with most 10–20 MHz bus systems.

How is cascading implemented for >9-bit parity?

Cascading uses the PE output of each 74HC280D,653 as an input to a second-stage device. For example, nine 9-bit generators feed their PE outputs to the I0–I8 pins of a final 74HC280D,653; its PE output then reflects even parity across all 81 bits. This hierarchical method preserves timing predictability and avoids fanout limitations inherent in wired-OR schemes.

What is the maximum capacitive load on PE or PO outputs?

The outputs are rated for ±4.0 mA DC drive at VCC = 4.5 V, supporting typical loads up to 50 pF without timing degradation. For heavier loads (e.g., >100 pF), propagation delay increases linearly - measured tpd rises ~10 ns per additional 20 pF beyond 50 pF per datasheet Figure 3 and Table 7 test conditions.

Does 74HC280D,653 require external pull-up or pull-down resistors?

No. All inputs and outputs are actively driven CMOS nodes with defined logic states across the full VCC range. Inputs include internal clamp diodes but no weak pull-ups; outputs have complementary push-pull structure. External resistors are unnecessary unless implementing wired-AND logic or level translation - not required for standard parity generation or checking.