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NXP Semiconductors N74F244D,623
- Part No.:
- N74F244D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F244D,623.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,510
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Product details
Overview
N74F244D,623 from Philips Semiconductors is a 20-pin plastic SOIC octal non-inverting 3-state buffer IC designed for bus interface and memory address register driving. It features dual active-low output enables (OEa/OEb), 64mA sink/15mA source drive capability, 4.0ns typical propagation delay, and operates over 0°C to +70°C commercial temperature range with 5V ±10% supply.
For engineers reviewing the N74F244D,623 datasheet, N74F244D,623 pinout, N74F244D,623 application, or N74F244D,623 equivalent, key selection criteria include 3-state bus isolation timing, industrial-grade noise immunity options, output skew constraints, and compatibility with legacy 74F logic families in space-constrained SOIC layouts.
Technical Context
The N74F244D,623 implements two independent 4-bit non-inverting buffer groups, each controlled by its own active-low 3-state enable (OEa for Ya0–Ya3, OEb for Yb0–Yb3). All outputs are TTL-compatible with guaranteed VOH ≥2.5V at IOH = –3mA and VOL ≤0.55V at IOL = 64mA under VCC = 4.5V min.
It uses standard 74F bipolar transistor-transistor logic (TTL) architecture with Schottky-clamped inputs and outputs. The device exhibits 2.0–5.2ns propagation delay across temperature and voltage extremes, and supports fan-out of up to 750 low-level loads per output due to its 64mA sink strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures stable operation with standard 5V rail tolerances |
| Propagation Delay | 4.0ns typical - enables reliable timing in high-speed bus systems up to ~200MHz clock domains |
| Output Sink Current | 64mA per pin - drives heavy capacitive loads including long PCB traces and multiple TTL inputs |
| Output Source Current | 15mA per pin - sufficient for pull-up termination and interfacing with CMOS inputs |
| Input Leakage | ±20µA max - minimizes static power draw and prevents false triggering on unterminated lines |
| Operating Temperature | 0°C to +70°C - certified for commercial-grade embedded control and instrumentation applications |
| Package Type | SOT163-1 (SO20, 7.5mm body width) - surface-mount compatible with automated assembly and 1.27mm pitch PCBs |
Pinout & Package
Package: 20-lead plastic small outline (SO) package per SOT163-1 specification, 7.5 mm body width, 1.27 mm lead pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low enable for Ya0–Ya3 outputs; asserts 3-state when high |
| 2–5 | Ia0–Ia3 | Data inputs for first buffer group; non-inverting path to Ya0–Ya3 |
| 6–9 | Yb0–Yb3 | Outputs for second buffer group; driven by Ib0–Ib3 when OEb low |
| 10 | GND | Ground reference for all internal circuitry and output stages |
| 11–14 | Ia2–Ia3 / Ib0–Ib1 | Continuation of input set; pin 11 = Ia2, pin 12 = Ia3, pin 13 = Ib0, pin 14 = Ib1 |
| 15–18 | Ya2–Ya3 / Yb2–Yb3 | Continuation of output set; pin 15 = Ya2, pin 16 = Ya3, pin 17 = Yb2, pin 18 = Yb3 |
| 19 | OEb | Active-low enable for Yb0–Yb3 outputs; independent control from OEa |
| 20 | VCC | +5V supply input; decoupling capacitor required adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | OEa and OEb allow selective isolation of two bus segments without shared control logic |
| 64mA output sink capability | Drives up to 10 standard TTL loads per output or long trace capacitance (>100pF) |
| Low-level input current (–1.6mA) | Ensures robust noise margin against ground bounce during simultaneous switching |
| Guaranteed 4.0ns max propagation delay | Supports synchronous bus timing with <10ns setup/hold windows in 25MHz systems |
| TTL-compatible voltage thresholds | VIH = 2.0V min / VIL = 0.8V max ensures interoperability with legacy 74LS/74AS logic families |
Applications
| Memory Address Buffering | Microprocessor Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to external SRAM or EPROM chips. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing level-shifted, isolated, and slew-controlled address signals. Use Value: Prevents address bus contention during DMA cycles using OEa/OEb gating; 64mA drive sustains signal integrity across 10cm PCB traces. | Use Scenario: Separating data bus segments between CPU and peripheral controller in multi-master systems. IC Role / Device Role / Timing Role: Bidirectional bus isolator enabling time-multiplexed access with precise enable timing control. Use Value: Dual OE pins allow staggered enable/disable sequencing to eliminate bus glitches during arbitration transitions. |
| Industrial I/O Expansion | Legacy System Interfacing |
Use Scenario: Extending parallel I/O ports on PLC modules requiring high-current digital outputs. IC Role / Device Role / Timing Role: Output driver stage translating low-current MCU GPIO to industrial-rated 24V interface levels via external transistors. Use Value: 15mA source/64mA sink capability directly drives base terminals of NPN/PNP interface transistors without additional buffering. | Use Scenario: Adapting modern microcontrollers to legacy 74F-based backplane architectures in test equipment. IC Role / Device Role / Timing Role: Logic-level translator and timing bridge maintaining 74F family propagation characteristics. Use Value: 4.0ns delay matches original system timing budgets; SOIC package allows drop-in replacement on existing SO-20 footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F244N | DIP-20 package; identical electrical specs but through-hole mounting | Requires PCB redesign for through-hole assembly; no SOIC footprint compatibility | Select when prototyping on breadboards or legacy DIP-based systems |
| 74F244BD | Enhanced version with reduced ICC (33mA vs 53mA), lower IIL (40µA), and <2.0ns output skew | Superior noise immunity and lower power; requires validation of skew-sensitive timing paths | Select for new designs where ground bounce reduction and tighter skew control are critical |
Compared with SN74F244N and 74F244BD, the N74F244D,623 provides optimal balance of SOIC space efficiency, proven 74F timing behavior, and commercial-temperature reliability-making it ideal for volume production of compact embedded controllers where pinout compatibility and thermal stability are prioritized over ultra-low skew or ultra-low power.
Availability
N74F244D,623 is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus isolation, and industrial I/O expansion requiring stable component supply across extended production lifecycles.
Supply support for N74F244D,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 specializing in logic, analog, and RF solutions for industrial, automotive, and consumer markets.
The 74F logic family-including N74F244D,623-was engineered for high-speed TTL-compatible operation in commercial and industrial control systems, emphasizing robust noise margins, predictable timing, and broad temperature tolerance.
FAQ
What is the maximum operating temperature range supported by the N74F244D,623?
The N74F244D,623 is rated for commercial temperature operation from 0°C to +70°C. It is not specified for industrial range (–40°C to +85°C); that rating applies only to the N74F244N and I74F244N variants in DIP packages. Thermal derating beyond +70°C is not guaranteed, and prolonged operation above this limit may impair parametric performance or reliability of the N74F244D,623.
Does the N74F244D,623 support true bidirectional data flow?
No, the N74F244D,623 is a unidirectional octal buffer with fixed input-to-output direction (Ia→Ya, Ib→Yb). It does not contain internal direction-control logic or bus transceivers. For bidirectional operation, external control of OEa/OEb combined with separate input/output routing is required-but the N74F244D,623 itself cannot reverse signal flow like a 74F245 transceiver.
What is the recommended decoupling strategy for the N74F244D,623?
A 100nF ceramic capacitor placed within 5mm of VCC (pin 20) and GND (pin 10) is mandatory for stable operation. For systems with high simultaneous switching noise, add a 4.7µF tantalum capacitor near the power entry point. The N74F244D,623's 53mA typical ICC and fast edge rates make localized decoupling essential to prevent VCC sag and ground bounce that could corrupt adjacent logic states.
Can the N74F244D,623 be used with 3.3V logic systems?
The N74F244D,623 is designed for 5V ±10% operation and is not 3.3V-tolerant. Its VIH minimum is 2.0V, but VCC must remain ≥4.5V for guaranteed VOH and VOL compliance. Interfacing with 3.3V systems requires level-shifting circuitry; direct connection risks insufficient noise margin and potential latch-up. Always power the N74F244D,623 from a regulated 5V rail.
How does the N74F244D,623 differ from the 74F244B variant?
The N74F244D,623 corresponds to the standard 74F244 (not 74F244B). Key differences include higher ICC (53mA vs 33mA), higher IIL (–1.6mA vs –40µA), no guaranteed output skew spec (<2.0ns), and absence of split-lead-frame noise immunity. The N74F244D,623 remains functionally identical but lacks the enhanced electrical characteristics introduced in the 74F244B revision.
N74F244D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
N74F244D,623 FAQ
1.How can I place an order for N74F244D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F244D,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 N74F244D,623 reliable?
The price and inventory of N74F244D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F244D,623 is usually 5 days.
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4.How is shipping managed for N74F244D,623?
N74F244D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F244D,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 N74F244D,623?
For technical support, including N74F244D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F244D,623 requirements.
6.How does Aetrix verify that N74F244D,623 is sourced from the original manufacturer or authorized distributors?
All N74F244D,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 N74F244D,623 meets industry standards.
7.What is the process for return or replacement of N74F244D,623?
All N74F244D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F244D,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 N74F244D,623 part is unused and in its original packaging.
Return procedure for N74F244D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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