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NXP Semiconductors N74F240D,623
- Part No.:
- N74F240D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F240D,623.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,287
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Product details
Overview
N74F240D,623 from NXP Semiconductors (formerly Philips) is an octal inverting 3-state buffer IC designed for bus interface and memory address register driving in 5 V TTL-compatible digital systems. It features dual active-low output enables (OEa, OEb), 4.3 ns typical propagation delay, ±15 mA high-level / 64 mA low-level output drive, and operates over 0 °C to +70 °C.
For engineers reviewing the N74F240D,623 datasheet, N74F240D,623 pinout, N74F240D,623 application, or N74F240D,623 equivalent, key selection criteria include 20-pin SSOP II package compatibility, dual independent 4-bit 3-state control, guaranteed 64 mA sink capability per output, and commercial-grade 5 V operation with strict VIH/VIL thresholds.
Technical Context
The N74F240D,623 implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable input (OEa for Ya0–Ya3; OEb for Yb0–Yb3). All outputs enter high-impedance state when their respective enable is HIGH.
It adheres to FAST TTL logic family specifications: VCC = 4.5–5.5 V, VIH ≥ 2.0 V, VIL ≤ 0.8 V, and supports fan-out of up to 750 FAST unit loads in LOW state. Propagation delay is specified at CL = 50 pF and RL = 500 Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74F FAST TTL - ensures compatibility with legacy 5 V TTL bus systems and higher speed than standard 74LS. |
| Propagation Delay (tPLH/tPHL) | 4.3 ns typical - enables reliable operation in high-speed address/data bus timing with <6.5 ns max across temperature. |
| Output Drive (IOL/IOH) | 64 mA sink / –15 mA source - sufficient to directly drive multiple TTL inputs or small capacitive loads without external buffers. |
| Supply Voltage Range | 4.5 V to 5.5 V - supports stable operation under nominal 5 V ±10% rail conditions common in industrial and computing power supplies. |
| Operating Temperature | 0 °C to +70 °C - qualified for commercial-grade applications including PC peripherals, instrumentation, and industrial controllers. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - provides noise margin against crosstalk and ground bounce in dense PCB layouts. |
Pinout & Package
Package: 20-pin plastic SSOP II (Small Outline Package), body width 5.3 mm, pitch 0.65 mm, JEDEC MO-153 compliant (SOT339-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEa, OEb | Active-low output enables - independently disable Ya0–Ya3 (Pin 1) or Yb0–Yb3 (Pin 19); both must be LOW for output assertion. |
| 2–5, 13–16 | Ia0–Ia3, Ib0–Ib3 | Inverting data inputs - each drives corresponding inverted output (e.g., Ia0 → Ya0); HIGH input yields LOW output and vice versa. |
| 11, 12 | VCC, GND | Power supply pins - Pin 20 = VCC (+5 V), Pin 10 = GND; decoupling capacitor placement near these pins is critical for noise immunity. |
| 6–9, 17–20 | Yb0–Yb3, Ya0–Ya3 | Inverting 3-state outputs - reflect inverted input logic when enabled; float to high-Z when OE is HIGH - essential for bus arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables selective isolation of two 4-bit data paths on shared bus lines without external gating logic. |
| 64 mA output sink capability | Drives up to 10 standard TTL loads per output, eliminating need for additional line drivers in memory address buffering. |
| 4.3 ns typical propagation delay | Supports >100 MHz bus clocking in synchronous designs where setup/hold margins are constrained by gate delay. |
| FAST TTL input thresholds and drive strength | Ensures interoperability with legacy 74F/74AS logic families while maintaining signal integrity at higher edge rates. |
Applications
| Memory Address Buffering | Bus Isolation Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller or FPGA to SRAM or EPROM chips. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level-shifted, current-boosted, and enable-controlled address signals. Use Value: Prevents bus contention during DMA cycles via OE-controlled high-Z states; 64 mA sink handles address line capacitance and fan-out. |
Use Scenario: Isolating two processor subsystems sharing a common data bus in modular embedded systems. IC Role / Device Role / Timing Role: Dual-enable octal buffer acting as bidirectional bus gate with independent control per 4-bit nibble. Use Value: Enables time-multiplexed bus access without arbitration logic; fast 4.3 ns delay preserves timing budgets in real-time systems. |
| Legacy System Bus Expansion | TTL-Compatible Logic Level Translation |
|
Use Scenario: Adding peripheral slots to industrial PLC backplanes using 5 V TTL signaling standards. IC Role / Device Role / Timing Role: Octal inverter with 3-state outputs serving as expansion bus driver with hot-swap-safe enable control. Use Value: Dual OE inputs allow staggered activation of address/data segments, reducing inrush current and EMI during slot insertion. |
Use Scenario: Interfacing modern microcontrollers with older TTL-based test equipment or instrumentation modules. IC Role / Device Role / Timing Role: Level-shifting inverter buffer matching 5 V TTL input thresholds and output drive requirements. Use Value: Eliminates need for discrete resistor networks or level translators; guaranteed VIH/VIL margins ensure robust noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F240N | 20-pin PDIP package (SOT146-1); identical electrical specs and pinout; longer lead time and higher thermal resistance. | Preferred for prototyping, through-hole assembly, or legacy board rework where SSOP footprint is incompatible. | Select SN74F240N only when DIP mounting or manual soldering is required; not suitable for high-density SMT production. |
| 74ACT240M | Advanced CMOS (ACT) family; 5 V tolerant, lower ICC (18 mA typ), but slower VOL rise time and no guaranteed 64 mA sink. | Better for low-power systems with mixed-voltage interfaces; unsuitable where legacy TTL load drive is mandatory. | Choose 74ACT240M only if power efficiency and CMOS input compatibility outweigh the need for full TTL sink strength. |
Compared with SN74F240N and 74ACT240M, the N74F240D,623 delivers optimal balance of proven 74F drive strength, SSOP space savings, and commercial-temperature reliability-making it the preferred choice for volume-manufactured 5 V bus interface designs requiring drop-in compatibility with existing 74F footprints.
Availability
N74F240D,623 is available at Aetrix Electronics and suitable for memory address buffering, bus isolation interfaces, legacy system bus expansion, and TTL-compatible logic level translation requiring stable component supply and long-term industrial availability.
Supply support for N74F240D,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 specializing in secure connectivity solutions, automotive MCUs, and legacy logic families inherited from Philips Semiconductors.
The N74F240D,623 belongs to the 74F FAST TTL logic series, engineered for high-speed, high-drive digital interfacing in industrial control, computing, and instrumentation systems operating at 5 V.
FAQ
What is the maximum output sink current specification for N74F240D,623?
The N74F240D,623 guarantees a minimum low-level output current (IOL) of 64 mA per output pin under recommended operating conditions (VCC = 4.5–5.5 V, Tamb = 0 °C to +70 °C). This rating is validated per the DC Electrical Characteristics table in the official NXP datasheet and enables direct drive of multiple TTL loads without external buffers. The N74F240D,623 maintains this performance across its full commercial temperature range.
Does N74F240D,623 support true bidirectional data flow?
No, the N74F240D,623 is an octal inverting buffer with unidirectional signal flow: inputs (Ia0–Ia3, Ib0–Ib3) drive corresponding inverted outputs (Ya0–Ya3, Yb0–Yb3). It does not implement internal direction control or bus transceiver functionality. Bidirectional operation requires external control logic and separate transmit/receive paths; the N74F240D,623 serves only as a controlled-output driver or isolator.
What is the pin 10 and pin 20 function for N74F240D,623?
Pin 10 is GND (ground reference) and Pin 20 is VCC (+5 V supply) for the N74F240D,623. This assignment matches the standard 20-pin SSOP II pinout defined in SOT339-1 and is consistent across all 74F240 variants. Proper decoupling (e.g., 100 nF ceramic capacitor) between these pins near the IC is required to suppress switching noise and ensure stable 3-state transitions.
Can N74F240D,623 operate at 3.3 V supply voltage?
No, the N74F240D,623 is specified only for VCC = 4.5 V to 5.5 V and is not characterized for reliable operation at 3.3 V. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive strength depend on 5 V rail compliance. Attempting 3.3 V operation may result in marginal logic levels, reduced noise margin, or failure to meet timing specs. For 3.3 V systems, consider 74LVC240 or similar CMOS alternatives instead of N74F240D,623.
What is the meaning of "octal inverting buffer (3-state)" in the N74F240D,623 product description?
"Octal" means the N74F240D,623 contains eight independent buffer channels grouped into two 4-bit sections. "Inverting" indicates each output is the logical complement of its input (e.g., HIGH input → LOW output). "3-state" refers to the high-impedance OFF state activated by asserting OEa or OEb HIGH - allowing multiple devices to share a common bus without contention. This triple functionality defines the core behavior of the N74F240D,623 in system-level interfacing.
N74F240D,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, 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
N74F240D,623 FAQ
1.How can I place an order for N74F240D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F240D,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 N74F240D,623 reliable?
The price and inventory of N74F240D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F240D,623 is usually 5 days.
3.What payment methods are accepted for N74F240D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F240D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F240D,623?
N74F240D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F240D,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 N74F240D,623?
For technical support, including N74F240D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F240D,623 requirements.
6.How does Aetrix verify that N74F240D,623 is sourced from the original manufacturer or authorized distributors?
All N74F240D,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 N74F240D,623 meets industry standards.
7.What is the process for return or replacement of N74F240D,623?
All N74F240D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F240D,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 N74F240D,623 part is unused and in its original packaging.
Return procedure for N74F240D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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