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NXP Semiconductors N74F244BD,623
- Part No.:
- N74F244BD,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F244BD,623.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,621
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Product details
Overview
N74F244BD,623 from Philips Semiconductors is a 20-pin plastic SOIC octal 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 at 5V, and operates across 0°C to +70°C commercial temperature range.
For engineers reviewing the N74F244BD,623 datasheet, N74F244BD,623 pinout, N74F244BD,623 application, or N74F244BD,623 equivalent, key selection criteria include 3-state bus isolation timing, industrial-grade noise immunity enhancements in the B-variant, IIL = 40µA low input leakage, and compatibility with 5V TTL logic systems requiring high fan-out drive.
Technical Context
The N74F244BD,623 implements two independent 4-bit 3-state buffer groups controlled by OEa and OEb, enabling selective bus segment isolation. Its logic architecture supports simultaneous high-impedance control of eight outputs with guaranteed skew <2.0ns between any Y outputs under matched load conditions.
This device uses standard FAST TTL circuitry with reduced ground bounce and lower ICC (33mA typical) versus the base 74F244 (53mA). Input thresholds meet VIL ≤ 0.8V and VIH ≥ 2.0V at VCC = 4.5–5.5V, ensuring robust noise margin in mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures compatibility with standard 5V TTL power rails and tolerates ±10% regulation variation. |
| Propagation Delay | 4.0ns typical - enables reliable operation in high-speed bus systems up to ~200MHz clock-equivalent data rates. |
| Output Drive | 64mA sink / 15mA source - supports direct connection to multiple TTL loads or moderate-capacitance PCB traces without external buffers. |
| Input Leakage | ±40µA max (74F244B variant) - reduces static loading on upstream drivers and improves signal integrity in high-density layouts. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded control and instrumentation applications. |
| Output Skew | <2.0ns - guarantees synchronized switching across all eight outputs, critical for glitch-free bus arbitration. |
| Package Type | SOT163-1 (SO20, 7.5mm body width) - surface-mount compatible with standard reflow profiles and automated assembly. |
Pinout & Package
Package: 20-lead plastic small outline (SOIC), SOT163-1, 7.5 mm body width, 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low enable for Ya0–Ya3 outputs; asserts 3-state when high, enables drive when low. |
| 2–5 | Ia0–Ia3 | Input signals for first 4-bit buffer group; directly routed to Ya0–Ya3 when OEa is active. |
| 6–9 | Yb0–Yb3 | Outputs for second 4-bit buffer group; driven only when OEb (Pin 19) is low. |
| 10 | GND | Ground reference for all internal logic and output stages; must be low-impedance connection. |
| 11–14 | Ia2–Ia3 / Ib0–Ib1 | Continuation of input bank assignments per functional grouping shown in logic diagram. |
| 15–18 | Ya2–Ya3 / Ib2–Ib3 | Output and input terminals aligned to match dual 4-bit channel architecture. |
| 19 | OEb | Active-low enable for Yb0–Yb3 outputs; independent control allows partial bus gating. |
| 20 | VCC | +5V supply rail; decoupling capacitor (0.1µF) required within 10mm of this pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state controls | OEa and OEb allow selective activation of two 4-bit segments - enables flexible bus partitioning without external logic. |
| Reduced ground bounce | Optimized internal layout and split lead frame minimize transient voltage spikes during simultaneous output switching. |
| Low input current | IIL = 40µA maximum eliminates need for pull-up/pull-down resistors on enable lines in low-power systems. |
| Guaranteed output skew | <2.0ns ensures deterministic timing alignment across all eight outputs - essential for synchronous bus protocols. |
| High sink current capability | 64mA per output supports direct driving of legacy TTL loads or LED indicators without series resistors. |
Applications
| Memory Address Buffering | Microprocessor Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM chips in embedded control systems. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating CPU address outputs from memory subsystem during DMA cycles. Use Value: Prevents bus contention via OE-controlled high-impedance state; 4.0ns delay preserves setup/hold timing margins at 12MHz bus clocks. |
Use Scenario: Interfacing 8-bit microcontroller data bus to peripheral ICs sharing common bus lines. IC Role / Device Role / Timing Role: Octal unidirectional buffer providing level-shifting and fan-out expansion for data path isolation. Use Value: 64mA sink capability drives multiple TTL inputs simultaneously; dual OE pins allow staggered peripheral enable sequencing. |
| Industrial I/O Expansion | Legacy System Bus Interface |
|
Use Scenario: Adding GPIO expansion to PLC mainboard using parallel port protocol over ribbon cable. IC Role / Device Role / Timing Role: Signal conditioner and driver for long-trace digital I/O lines subject to EMI and capacitive loading. Use Value: Low 40µA input leakage minimizes false triggering on unterminated stubs; SOIC package supports compact board layout. |
Use Scenario: Retrofitting ISA bus-compatible peripherals into retro-computing or test equipment designs. IC Role / Device Role / Timing Role: Standard TTL-compatible octal buffer meeting original IBM PC/AT timing and drive requirements. Use Value: Pinout and AC characteristics match 74F244B specification - enables drop-in replacement in vintage hardware repair. |
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 | Dual-in-line (DIP20) package; higher ICC (53mA typical); no split lead frame; IIL = 1.6mA (vs. 40µA) | Preferred for through-hole prototyping or legacy DIP-based systems where thermal mass aids hand-soldering. | Select SN74F244N only when DIP footprint is mandatory and ground bounce sensitivity is low. |
| 74ACT244PC | CMOS technology; 5V tolerant; 12mA output drive; 8.5ns max propagation delay; wider VCC range (4.5–5.5V) | Better suited for mixed-voltage systems interfacing 3.3V logic; lower power but reduced drive strength vs. FAST TTL. | Choose 74ACT244PC when interfacing with CMOS peripherals or when ultra-low static power is prioritized over drive capability. |
Compared with SN74F244N and 74ACT244PC, the N74F244BD,623 delivers superior noise immunity and lower input loading while maintaining full 5V TTL compatibility - making it optimal for high-reliability commercial bus interfaces where signal integrity and legacy compatibility are critical.
Availability
N74F244BD,623 is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus isolation, and industrial I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for N74F244BD,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) is a Dutch semiconductor manufacturer founded in 1953, specializing in analog, logic, and automotive ICs with global manufacturing and R&D infrastructure.
The 74F244/74F244B family was engineered for high-speed TTL-compatible bus interface applications in computing, industrial control, and telecommunications equipment requiring robust drive strength and precise timing control.
FAQ
What is the operating temperature range for the N74F244BD,623?
The N74F244BD,623 is specified for commercial operation from 0°C to +70°C. Unlike the base 74F244, the 74F244B variant (including N74F244BD,623) does not offer an industrial -40°C to +85°C option - that rating applies only to the non-B DIP and SO versions marked I74F244N/I74F244D.
Does the N74F244BD,623 support true bidirectional data flow?
No, the N74F244BD,623 is a unidirectional octal buffer with fixed input-to-output signal direction (Ia→Ya, Ib→Yb). It lacks internal direction control or bus transceiver functionality. For bidirectional operation, discrete directional control logic or dedicated transceivers like the 74F245 are required.
What is the maximum capacitive load the N74F244BD,623 can drive reliably?
The N74F244BD,623 AC specifications are characterized at CL = 50pF. While it can drive heavier loads due to its 64mA sink capability, propagation delay increases linearly with capacitance - exceeding 100pF may violate the 4.0ns typical tPLH/tPHL spec and require empirical validation in the target system.
Is the N74F244BD,623 pin-compatible with the original 74F244N DIP version?
Yes, the N74F244BD,623 shares identical pin numbering and logic function with the 74F244N, including OEa/OEb placement and I/O mapping. However, differences in package parasitics (SOIC vs. DIP) and electrical parameters (e.g., IIL = 40µA vs. 1.6mA) mean layout and system-level timing validation is required for drop-in replacement.
What does "split lead frame" mean for the N74F244BD,623?
The split lead frame in the N74F244BD,623 physically separates power and ground leads internally to reduce mutual inductance. This design lowers ground bounce during simultaneous output switching - a key improvement over the standard 74F244 that enhances signal integrity in dense PCB layouts.
N74F244BD,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
N74F244BD,623 FAQ
1.How can I place an order for N74F244BD,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F244BD,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 N74F244BD,623 reliable?
The price and inventory of N74F244BD,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F244BD,623 is usually 5 days.
3.What payment methods are accepted for N74F244BD,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F244BD,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F244BD,623?
N74F244BD,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F244BD,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 N74F244BD,623?
For technical support, including N74F244BD,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F244BD,623 requirements.
6.How does Aetrix verify that N74F244BD,623 is sourced from the original manufacturer or authorized distributors?
All N74F244BD,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 N74F244BD,623 meets industry standards.
7.What is the process for return or replacement of N74F244BD,623?
All N74F244BD,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F244BD,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 N74F244BD,623 part is unused and in its original packaging.
Return procedure for N74F244BD,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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