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NXP Semiconductors N74F240DB,118
- Part No.:
- N74F240DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
N74F240DB,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
N74F240DB,118 from NXP Semiconductors (formerly Philips) is an octal inverting 3-state buffer IC designed for bus interface applications. It features two independent active-low output enables (OEa, OEb), sinks up to 64 mA per output, sources up to 15 mA, and delivers 4.3 ns typical propagation delay at 5 V. It is used in memory address register buffering and bidirectional data bus isolation.
For engineers reviewing the N74F240DB,118 datasheet, N74F240DB,118 pinout, N74F240DB,118 application, or N74F240DB,118 equivalent, key selection criteria include dual 4-bit 3-state control, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), guaranteed 64 mA sink capability, and SSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The N74F240DB,118 implements two independent groups of four inverting buffers, each controlled by a dedicated active-low output enable. All eight outputs enter high-impedance state when their respective enable is HIGH, enabling bidirectional bus sharing without contention.
It operates strictly within commercial temperature range (0 °C to +70 °C) and 4.5–5.5 V supply, with defined DC characteristics including VOL ≤ 0.50 V at IOL = 64 mA and VOH ≥ 2.4 V at IOH = –15 mA. AC timing is specified at CL = 50 pF and RL = 500 Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with dual 3-state control (OEa/OEb) |
| Propagation Delay | 4.3 ns typical (input to output, 5 V, 25 °C) - enables high-speed bus timing |
| Output Drive | Sinks 64 mA / sources 15 mA - drives heavy TTL loads and multiple inputs |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V logic rails |
| Input Thresholds | VIL = 0.8 V max, VIH = 2.0 V min - ensures robust noise margin vs. TTL/LS families |
| Operating Temperature | 0 °C to +70 °C - qualified for commercial-grade embedded systems |
| Package | SSOP-20 (SOT339-1), 5.3 mm body width - surface-mount, space-efficient footprint |
Pinout & Package
Package: Plastic shrink small outline package (SSOP-20), SOT339-1, 20-pin, 0.65 mm pitch, 5.3 mm body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low enable for Yb0–Yb3 outputs; disables group B when HIGH |
| 2–5, 7–10 | Ia0–Ia3, Ib0–Ib3 | Eight buffered inverting inputs; Ia0–Ia3 drive Ya0–Ya3, Ib0–Ib3 drive Yb0–Yb3 |
| 11 | GND | Ground reference for all logic and output stages |
| 12 | VCC | +5 V supply rail; decoupling required near pin |
| 13 | OEb | Active-low enable for Ya0–Ya3 outputs; disables group A when HIGH |
| 14–17, 19–20 | Ya0–Ya3, Yb0–Yb3 | Eight inverting 3-state outputs; high-impedance when respective OE is HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables selective bus arbitration between two subsystems without external logic |
| 64 mA output sink capability | Drives up to 16 standard TTL loads per output, eliminating need for external drivers |
| 4.3 ns typical propagation delay | Supports >100 MHz bus toggle rates in short trace configurations |
| TTL-compatible input thresholds | Interoperates directly with 74LS, 74ALS, and legacy microprocessor address/data buses |
| High-impedance off-state leakage ≤ ±50 µA | Prevents signal contention and power loss when outputs are disabled |
Applications
| Memory Address Buffering | Microprocessor Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address outputs and enabling chip-select-controlled memory access. Use Value: Prevents bus contention during memory refresh or DMA cycles via OE-controlled high-Z states. |
Use Scenario: Separating data bus segments between CPU and peripheral controller to avoid loading and timing skew. IC Role / Device Role / Timing Role: Dual-group octal buffer providing directionally isolated, inverted data path with independent enable control. Use Value: Enables simultaneous read/write operations across bus segments using OEa/OEb sequencing. |
| Legacy System Bus Expansion | Industrial Control Backplane Interface |
Use Scenario: Extending ISA or PC/104 bus signals to add-on cards requiring level-shifted or buffered address/data lines. IC Role / Device Role / Timing Role: TTL-compatible inverting repeater restoring signal integrity and fan-out capacity on long traces. Use Value: Maintains setup/hold timing margins under 64 mA load while supporting multi-drop routing. |
Use Scenario: Interfacing PLC I/O modules to a central backplane where noise immunity and drive strength are critical. IC Role / Device Role / Timing Role: Robust bus driver handling EMI-prone industrial environments with guaranteed 64 mA sink per line. Use Value: Eliminates need for discrete transistor arrays while meeting IEC 61000-4-4 surge immunity requirements via strong output stage. |
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 | DIP-20 package (SOT146-1); identical electrical specs and pinout | Through-hole mounting only; unsuitable for automated SMT assembly | Select when manual prototyping or legacy DIP-based systems require drop-in replacement |
| 74ACT240SO | ACT family: 5 V CMOS, 12 mA IOL, 4.5 ns tPD, wider VCC range (4.5–5.5 V), lower ICCZ | Lower power consumption but reduced drive strength; not TTL-input-compatible | Select when system uses mixed CMOS/TTL logic and power efficiency outweighs drive requirement |
Compared with SN74F240N and 74ACT240SO, the N74F240DB,118 uniquely combines SSOP-20 surface-mount compatibility, full TTL input compatibility, and 64 mA drive-making it optimal for space-constrained, high-fan-out commercial embedded designs where legacy interoperability is mandatory.
Availability
N74F240DB,118 is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus isolation, legacy system bus expansion, and industrial control backplane interface applications requiring stable component supply and long-term commercial-grade availability.
Supply support for N74F240DB,118 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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74F logic family-including N74F240DB,118-was developed by Philips for high-speed, low-power TTL-compatible digital interfacing in commercial embedded systems and computer peripherals.
FAQ
What is the operating voltage range for N74F240DB,118?
The N74F240DB,118 operates over a supply voltage range of 4.5 V to 5.5 V, with recommended nominal operation at 5.0 V ±10%. Operation outside this range may impair functionality or reliability, and absolute maximum ratings limit VCC to –0.5 V to +7.0 V. The N74F240DB,118 must be powered within its specified range to guarantee correct logic levels and output drive performance.
Does N74F240DB,118 support true bidirectional data flow?
No, the N74F240DB,118 is an inverting unidirectional buffer: inputs (Ia0–Ia3, Ib0–Ib3) drive corresponding outputs (Ya0–Ya3, Yb0–Yb3) with polarity inversion. It does not auto-sense direction or provide internal feedback paths. Bidirectional bus control requires external OE coordination and complementary devices; the N74F240DB,118 itself performs fixed-direction signal conditioning only.
What is the maximum capacitive load the N74F240DB,118 can drive reliably?
The N74F240DB,118 AC specifications are characterized at CL = 50 pF. While it can drive higher capacitance, propagation delay increases linearly with load; exceeding 100 pF typically degrades tPLH/tPHL beyond 8 ns and risks timing violations in high-speed buses. For loads >50 pF, verify timing margins in-system, and the N74F240DB,118 should be paired with series termination or reduced trace length.
Can N74F240DB,118 be used with 3.3 V logic systems?
No, the N74F240DB,118 is not 3.3 V tolerant. Its inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V referenced to a 5 V supply, and it draws supply current optimized for 5 V operation. Connecting it directly to 3.3 V logic may cause undefined output states or excessive input current. Level-shifting circuitry is required, and the N74F240DB,118 must remain powered at 5 V.
How are the two output enable inputs (OEa and OEb) intended to be used in practice?
OEa controls outputs Yb0–Yb3; OEb controls Ya0–Ya3. This allows independent gating of two 4-bit data groups-e.g., upper/lower byte addressing or separate peripheral select domains. Both enables are active-low and asynchronous; asserting either HIGH places its associated outputs in high-impedance state. The N74F240DB,118 enables clean bus sharing without external AND logic or timing overlap concerns.
N74F240DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
N74F240DB,118 FAQ
1.How can I place an order for N74F240DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F240DB,118 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 N74F240DB,118 reliable?
The price and inventory of N74F240DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F240DB,118 is usually 5 days.
3.What payment methods are accepted for N74F240DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F240DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F240DB,118?
N74F240DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F240DB,118 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 N74F240DB,118?
For technical support, including N74F240DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F240DB,118 requirements.
6.How does Aetrix verify that N74F240DB,118 is sourced from the original manufacturer or authorized distributors?
All N74F240DB,118 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 N74F240DB,118 meets industry standards.
7.What is the process for return or replacement of N74F240DB,118?
All N74F240DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with N74F240DB,118, 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 N74F240DB,118 part is unused and in its original packaging.
Return procedure for N74F240DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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