NXP Semiconductors N74F74D,623

Overview

N74F74D,623 from NXP Semiconductors (formerly Philips) is a dual positive-edge-triggered D-type flip-flop in a 14-pin SOIC package, operating at 5V supply with 125MHz maximum clock frequency, 4.4ns typical propagation delay (CP to Q), and asynchronous active-low set/reset inputs. It delivers true and complementary outputs per channel and supports industrial temperature range (–40°C to +85°C) for use in synchronous logic control circuits.

For engineers reviewing the N74F74D,623 datasheet, N74F74D,623 pinout, N74F74D,623 application, or N74F74D,623 equivalent, key selection criteria include edge-trigger timing behavior, fan-out capability (50/33 U.L. on outputs), setup/hold time compliance (2.0ns/1.0ns), and compatibility with 74F-family TTL logic levels and drive strength.

Technical Context

The device implements two independent D-type latches synchronized to the rising edge of CP0 and CP1, with fully asynchronous SDn/RDn control that overrides clocked operation. Each channel maintains separate data, clock, set, reset, Q, and Q̅ terminals, enabling independent state control without inter-channel coupling.

Logic operation follows strict setup (2.0ns) and hold (1.0ns) timing relative to the low-to-high clock transition, with propagation delays specified separately for clock-to-output (t_PLH/t_PHL ≤ 9.2ns) and set/reset-to-output (≤ 10.5ns), ensuring predictable metastability handling in multi-stage synchronizers.

Key Specifications

Pinout & Package

Package: 14-lead plastic small outline (SO), body width 3.9 mm, SOT108-1 footprint, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual D-type flip-flop applications.

Compared with SN74F74N and 74ACT74SCX, N74F74D,623 uniquely combines industrial temperature support, SOIC surface-mount compatibility, and full 74F-family electrical equivalence-making it the only option among the three qualified for long-life industrial control hardware.

Availability

N74F74D,623 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment sequencing, and legacy system bus interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for N74F74D,623 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.

The 74F logic family-including N74F74D,623-was engineered for high-speed TTL-compatible digital systems requiring robust noise immunity, predictable timing, and interoperability across mixed-vendor designs in industrial and instrumentation markets.

FAQ

What is the maximum allowable clock duty cycle for reliable operation of N74F74D,623?

The device requires a minimum high-time and low-time of 4.0 ns each (t_w(H)/t_w(L)), meaning the clock signal must maintain ≥4 ns pulse width in both states. This corresponds to a maximum duty cycle asymmetry of 50% ± tolerance, but no explicit upper/lower bound is specified beyond the pulse-width requirement. Operation remains valid across 40–60% duty cycles if timing margins are met.

Can SD and RD be tied together and driven by a single control line?

Yes-SD0/SD1 and RD0/RD1 may be paralleled respectively, as each input has identical electrical characteristics (1.0/3.0 U.L., –1.8 mA I_IL). However, doing so eliminates independent control of the two flip-flops, converting the device into a synchronized dual-set or dual-reset unit rather than two fully independent latches.

Does N74F74D,623 support hot insertion or live-state configuration?

No-N74F74D,623 lacks hot-swap protection circuitry or I²C-style bus arbitration. Applying VCC while inputs are driven risks violating absolute maximum ratings (e.g., V_IN > V_CC + 0.5 V). Power sequencing must ensure VCC is stable before asserting any input signals to prevent latch-up or parametric shift.

How does the 74F74 differ from the 74LS74 in practical PCB layout?

N74F74D,623 demands tighter power rail decoupling (0.1 µF ceramic per VCC pin) due to higher transient current (11.5 mA ICC vs. ~19 mA for LS74), faster edge rates, and greater sensitivity to ground bounce. Its SOIC package also requires controlled-impedance routing for clock nets to avoid skew between CP0/CP1 when used in synchronous dual-channel mode.