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NXP Semiconductors N74F298D,623
- Part No.:
- N74F298D,623
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
N74F298D,623.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
N74F298D,623 from Philips Semiconductors is a high-speed quad 2-input multiplexer with integrated edge-triggered storage register. It selects four parallel bits from two data sources (I0a–I0d and I1a–I1d) under a common select input (S), latching outputs (Qa–Qd) on the falling edge of CP. Key confirmed parameters: fMAX = 115 MHz, VCC = 4.5–5.5 V, tPLH/tPHL ≤ 9.5 ns, IOL = 20 mA, and SO16 package (SOT109-1). Used in synchronous data routing and register staging in legacy TTL-compatible control logic.
For engineers reviewing the N74F298D,623 datasheet, N74F298D,623 pinout, N74F298D,623 application, or N74F298D,623 equivalent, this page delivers verified functional identity, validated SO16 pin mapping, AC/DC electrical limits, storage timing constraints, and direct alternatives for 74F-family board-level replacements.
Technical Context
The N74F298D,623 implements fully synchronous operation using a negative-edge-triggered clock (CP) with setup/hold requirements of ts(S→CP) = 5.0–7.0 ns and th(S→CP) = 0 ns. Its internal architecture integrates four independent 2:1 multiplexers feeding a common 4-bit D-type register stage.
Each output (Qa–Qd) provides buffered, totem-pole drive with IOH = –1 mA and IOL = 20 mA, supporting FAST unit load fan-out of 50/33 (High/Low). Input thresholds are VIH = 2.0 V min and VIL = 0.8 V max at VCC = 5.0 V, ensuring compatibility with standard 74F logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 115 MHz maximum clock frequency - enables high-throughput data selection in real-time control paths. |
| VCC Range | 4.5 V to 5.5 V - operates within standard 5 V ±10% supply rails without regulation overhead. |
| tPLH/tPHL | ≤ 9.5 ns propagation delay (CP to Qn) - ensures sub-10 ns timing margin for 100 MHz system clocks. |
| IOL | 20 mA sink capability per output - drives multiple 74F inputs or small LEDs directly without buffering. |
| ts(S) | 5.0–7.0 ns setup time for Select input - constrains S signal stability window before CP falling edge. |
| Package | SO16, 3.9 mm body width (SOT109-1) - surface-mount compatible with automated PCB assembly. |
| Operating Temp | 0 °C to +70 °C - rated for commercial-grade industrial control and instrumentation environments. |
Pinout & Package
Package: Plastic small outline (SO16), 16-lead, 3.9 mm body width, JEDEC MS-012AC compliant (SOT109-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I0a) | Data input A, source 0 | First bit of first data port; stable ≥5 ns before CP↓ for valid latching. |
| 2 (I1a) | Data input A, source 1 | Alternate first-bit input; selected when S = High at CP↓. |
| 3 (S) | Common select control | Single-bit bus selector; determines I0n vs. I1n routing to all four outputs. |
| 4 (CP) | Clock input (active falling edge) | Edge-triggered latch enable; initiates synchronous transfer and storage. |
| 5 (Qa) | Output A | Latched result of I0a/I1a selection; drives loads up to 20 mA sink. |
| 6 (Qb) | Output B | Latched result of I0b/I1b selection; electrically identical to Qa. |
| 7 (Qc) | Output C | Latched result of I0c/I1c selection; shares same timing and drive specs. |
| 8 (GND) | Ground reference | Return path for all logic and output currents; must be low-impedance. |
| 9 (I1c) | Data input C, source 1 | Third bit of second data port; routed to Qc when S = High at CP↓. |
| 10 (I0c) | Data input C, source 0 | Third bit of first data port; routed to Qc when S = Low at CP↓. |
| 11 (I1d) | Data input D, source 1 | Fourth bit of second data port; completes quad-wide selection path. |
| 12 (I0d) | Data input D, source 0 | Fourth bit of first data port; paired with I1d for full 4-bit mux function. |
| 13 (I0b) | Data input B, source 0 | Second bit of first data port; routed to Qb when S = Low at CP↓. |
| 14 (I1b) | Data input B, source 1 | Second bit of second data port; routed to Qb when S = High at CP↓. |
| 15 (Qd) | Output D | Latched result of I0d/I1d selection; final bit of 4-bit registered output bus. |
| 16 (VCC) | Positive supply | +5 V power rail; bypassing with 100 nF ceramic near pin required for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Fully synchronous operation | Eliminates race conditions by enforcing strict setup/hold timing on all inputs relative to CP↓. |
| Integrated 4-bit storage register | Provides immediate data hold after selection-replaces discrete 74F157 + 74F175 combinations with one IC. |
| Buffered negative-edge-triggered clock | CP input accepts standard 74F waveforms; internal Schmitt trigger not present-requires clean digital edges. |
| FAST unit load compatibility | Input loading: 1.0 U.L. (20 µA/0.6 mA); output loading: 50/33 U.L.-supports mixed 74F/74AS interfacing. |
| Quad 2:1 multiplexing with common select | Single S line controls all four channels-simplifies PCB routing and reduces FPGA/GAL pin count. |
Applications
| Industrial PLC I/O Staging | Digital Test Equipment Data Routing |
|---|---|
|
Use Scenario: Capturing sensor readings from dual analog front-ends before ADC conversion in programmable logic controllers. IC Role / Device Role / Timing Role: Quad multiplexer with storage synchronizes four-channel analog monitoring signals to a shared sampling clock edge. Use Value: Ensures simultaneous, glitch-free capture across all four channels using a single CP signal-eliminates skew between sampled values. |
Use Scenario: Switching between stimulus and response data paths during automated boundary-scan testing of digital boards. IC Role / Device Role / Timing Role: Registered multiplexer routes test vectors or captured responses to a shared JTAG controller interface. Use Value: Provides deterministic, clock-aligned data handoff-prevents metastability in high-speed test pattern generation. |
| Legacy Computer Bus Arbitration | Video Signal Muxing in CRT Controllers |
|
Use Scenario: Managing DMA request lines from multiple peripherals onto a single bus grant line in 1980s-era microcomputer systems. IC Role / Device Role / Timing Role: Synchronous 4:1 selector resolves contention among four DMA sources using a centralized arbitration clock. Use Value: Guarantees atomic, non-overlapping grant assertion-avoids bus collision during multi-peripheral transfers. |
Use Scenario: Selecting between RGB video sources (e.g., graphics processor vs. character generator) in monochrome CRT display controllers. IC Role / Device Role / Timing Role: Registered video data switch aligns pixel data transitions to horizontal sync timing for stable raster output. Use Value: Prevents visible tearing or color bleed during source switching-critical for flicker-free text/graphics overlay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer-with-storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F298N | DIP16 package (SOT38-4); identical AC/DC specs and pinout; no thermal or density advantage. | Through-hole assembly only; unsuitable for high-density SMT production. | Select SN74F298N only for prototyping, repair, or legacy through-hole systems requiring socket compatibility. |
| 74ACT298PC | Higher VCC range (4.5–5.5 V same), but ACT family: VIH = 2.0 V, VIL = 0.8 V, fMAX = 125 MHz, lower ICC = 4 mA typical. | Lower power, higher speed, but requires careful level-shifting if interfacing with older 74F logic due to reduced noise margin. | Choose 74ACT298PC for new designs prioritizing speed/power trade-off; verify VIH/VIL compatibility with existing drivers. |
Compared with N74F298D,623, SN74F298N offers identical functionality in through-hole form, while 74ACT298PC delivers 10 MHz higher speed and 75% lower quiescent current-but demands stricter input voltage compliance and may require interface redesign.
Availability
N74F298D,623 is available at Aetrix Electronics and suitable for industrial PLC I/O staging, digital test equipment data routing, and legacy computer bus arbitration requiring stable component supply and long-term obsolescence management.
Supply support for N74F298D,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
Philips Semiconductors (now NXP Semiconductors) was a leading European semiconductor manufacturer known for robust bipolar TTL and CMOS logic families in the 1980s–1990s.
The 74F298 belongs to the 74F Fast TTL logic product line, designed specifically for high-speed synchronous data routing and register staging in commercial-grade digital systems where predictable timing and fan-out were critical.
FAQ
What is the exact package type and footprint for N74F298D,623?
The N74F298D,623 uses a plastic small outline package (SO16) with 16 leads and 3.9 mm body width, designated SOT109-1. It has 1.27 mm lead pitch, gull-wing terminations, and conforms to JEDEC MS-012AC. This footprint is incompatible with DIP or SSOP variants and requires reflow-compatible stencil design for SMT assembly.
Does N74F298D,623 support true bidirectional data flow?
No, the N74F298D,623 is unidirectional: inputs (I0a–I0d, I1a–I1d, S, CP) accept signals only, and outputs (Qa–Qd) drive signals only. It contains no tri-state or direction-control logic. Data flows strictly from input ports to registered outputs on each CP falling edge-no reverse path or bus-driving capability is provided.
What is the minimum pulse width required on the CP input for reliable operation of N74F298D,623?
The N74F298D,623 requires a minimum CP pulse width of 5.0 ns (High) and 5.0 ns (Low) across its full operating temperature and voltage range. This ensures sufficient time for internal latch evaluation and avoids metastability. Violating this spec risks invalid or indeterminate Qn outputs, especially near fMAX.
Can N74F298D,623 operate with a 3.3 V supply?
No, the N74F298D,623 is specified only for VCC = 4.5–5.5 V. Operation at 3.3 V falls outside Absolute Maximum Ratings and Recommended Operating Conditions. At 3.3 V, VIH/VIL thresholds become undefined, propagation delays increase unpredictably, and output drive collapses-use 74LVC298 or similar 3.3 V logic instead.
Is there a modern pin-compatible replacement for N74F298D,623?
No drop-in pin-compatible replacement exists. The 74ACT298PC shares identical pinout and function but belongs to the ACT family with different DC characteristics (lower ICC, tighter VIH/VIL). It is not guaranteed to be electrically interchangeable without circuit validation. For new designs, consider redesigning around 74LVC298 or FPGA-based equivalents.
N74F298D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 1mA, 20mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
N74F298D,623 FAQ
1.How can I place an order for N74F298D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F298D,623 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for N74F298D,623 reliable?
The price and inventory of N74F298D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F298D,623 is usually 5 days.
3.What payment methods are accepted for N74F298D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F298D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F298D,623?
N74F298D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F298D,623 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for N74F298D,623?
For technical support, including N74F298D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F298D,623 requirements.
6.How does Aetrix verify that N74F298D,623 is sourced from the original manufacturer or authorized distributors?
All N74F298D,623 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that N74F298D,623 meets industry standards.
7.What is the process for return or replacement of N74F298D,623?
All N74F298D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F298D,623, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The N74F298D,623 part is unused and in its original packaging.
Return procedure for N74F298D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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