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NXP Semiconductors N74F244DB,112
- Part No.:
- N74F244DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
N74F244DB,112.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,363
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Product details
Overview
N74F244DB,112 from NXP Semiconductors (formerly Philips) is an octal 3-state buffer IC designed for bus interface and memory address register driving in TTL-compatible digital systems. It features dual active-low output enables (OEa/OEb), 64mA sink / 15mA source drive capability, 4.0ns typical propagation delay, and operates at 5V ±10% over 0°C to +70°C. It is used in industrial control backplanes and legacy data acquisition systems requiring high-current bus buffering.
For engineers reviewing the N74F244DB,112 datasheet, N74F244DB,112 pinout, N74F244DB,112 application, or N74F244DB,112 equivalent, key selection criteria include its SSOP-II package footprint, 20-pin lead count, 3-state timing (tPZH/tPLZ ≤ 8.0ns), low input leakage (IIL = 40µA), and compatibility with 5V TTL logic families in space-constrained PCB layouts.
Technical Context
The N74F244DB,112 implements two independent 4-bit 3-state buffer groups controlled by OEa and OEb, enabling selective bus isolation without external gating. Its architecture supports simultaneous bidirectional bus control via separate enable inputs, with guaranteed output skew <2.0ns between any Y outputs under matched load conditions.
It uses a bipolar FET (F-series) process optimized for speed-power trade-offs: typical ICC drops to 33mA (vs. 53mA for 74F244), ground bounce is reduced via split lead frame, and input loading is minimized (IIL = 40µA) - all distinguishing the "B" variant from standard 74F244.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V: Ensures stable operation across standard 5V TTL rail tolerances without regulation. |
| Propagation Delay | 4.0ns typ (Ian/Ibn → Yn): Enables reliable timing in 25MHz+ synchronous bus interfaces. |
| Output Drive | 64mA sink / 15mA source: Drives ≥10 standard TTL loads or 50pF capacitive bus lines directly. |
| Input Leakage | ±40µA max (74F244B): Reduces static current draw and improves noise margin in high-impedance enable paths. |
| Operating Temp | 0°C to +70°C: Qualified for commercial-grade embedded systems and instrumentation environments. |
| Output Skew | <2.0ns (74F244B): Guarantees simultaneous valid data assertion across all 8 outputs for setup/hold integrity. |
| Package | SSOP-20 (SOT339-1), 5.3mm body width: Supports high-density PCB layouts where DIP/SO-20 are too large. |
Pinout & Package
Package: Plastic shrink small outline package (SSOP-20), SOT339-1, 20-lead, 0.65mm pitch, 5.3mm body width, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low enable for Ya0–Ya3 outputs; asserts 3-state high-impedance when high. |
| 2–5 | Ia0–Ia3 | Data inputs for group A; routed to Ya0–Ya3 when OEa = L. |
| 6–9 | Yb0–Yb3 | Outputs for group B; driven by Ib0–Ib3 when OEb = L. |
| 10 | GND | Ground reference for all logic and output stages; must be low-inductance connection. |
| 11–14 | Ia2–Ia3 / Yb0–Yb1 | Mixed I/O pins per functional grouping; pin 11 = Ia2, pin 12 = Yb0, etc., per logic diagram. |
| 15–18 | Ya2–Ya3 / Ib0–Ib1 | Group A outputs and Group B inputs interleaved; requires careful signal routing to avoid crosstalk. |
| 19 | OEb | Active-low enable for Yb0–Yb3; independent of OEa for flexible bus partitioning. |
| 20 | VCC | +5V supply; decoupling capacitor (100nF) required within 5mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state enables | OEa and OEb allow isolated control of two 4-bit data paths on shared bus infrastructure. |
| Reduced ground bounce | Split lead frame minimizes simultaneous switching noise during multi-output transitions. |
| Low input current | IIL = 40µA (vs. 1.6mA in 74F244) eases fan-out design and reduces enable-line loading. |
| Guaranteed output skew | <2.0ns ensures deterministic timing alignment across all 8 outputs for synchronous sampling. |
| High sink current | 64mA per output supports direct driving of terminated transmission lines or multiple TTL inputs. |
Applications
| Industrial Backplane Interface | Legacy Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating CPU address bus from multiple peripheral modules in modular PLC chassis. IC Role / Device Role / Timing Role: Octal 3-state buffer providing direction-controlled, low-skew address latching with independent group enables. Use Value: Enables hot-swap-capable module addressing without bus contention; 64mA drive sustains signal integrity over 15cm backplane traces. |
Use Scenario: Driving 16-bit address lines from microcontroller to SRAM/ROM in retro-computing hardware. IC Role / Device Role / Timing Role: Level-shifting and fan-out amplification for 5V TTL-compatible memory address decoding. Use Value: 4.0ns propagation delay meets 25MHz access timing; SSOP-20 saves board space vs. DIP alternatives. |
| Test Equipment Signal Routing | Automated Data Acquisition Bus |
|
Use Scenario: Multiplexing sensor channel select lines in automated test fixtures with shared control bus. IC Role / Device Role / Timing Role: Bidirectional bus switch controlled by OEa/OEb for dynamic channel assignment. Use Value: Dual enables allow real-time reconfiguration without CPU intervention; low IIL prevents enable-line voltage droop. |
Use Scenario: Buffering analog-to-digital converter (ADC) parallel output bus to microcontroller in environmental monitoring nodes. IC Role / Device Role / Timing Role: Transient-suppressed data latch interface with precise 3-state timing for sample-and-hold synchronization. Use Value: Guaranteed skew <2.0ns ensures simultaneous 8-bit data capture; 15mA sourcing drives ADC output buffers reliably. |
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; higher ICC (53mA); no skew guarantee; IIL = 1.6mA. | Suitable only where board space permits DIP and ground bounce is non-critical. | Select if legacy through-hole assembly or socket-based prototyping is required. |
| 74ABT244BDB | ABT family: 4.5V–5.5V, 3.5ns delay, 64mA sink, but CMOS-compatible inputs (VIH = 2.0V min). | Better noise immunity and lower power, but requires verification of input threshold compatibility. | Prefer for new designs needing improved EMI performance and tighter timing margins. |
Compared with SN74F244N and 74ABT244BDB, the N74F244DB,112 offers optimal balance of proven reliability, SSOP footprint, and guaranteed skew for legacy 5V TTL bus systems - especially where pin-for-pin replacement of existing SSOP-20 F244B variants is needed without layout change.
Availability
N74F244DB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory subsystems, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for N74F244DB,112 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 (originally Philips Semiconductors) is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The 74F logic family - including N74F244DB,112 - was engineered for high-speed, low-noise 5V TTL system interfacing, targeting industrial control, instrumentation, and computer peripheral designs of the 1990s.
FAQ
What is the operating temperature range for N74F244DB,112?
The N74F244DB,112 is specified for commercial operation from 0°C to +70°C. Unlike the base 74F244, the 74F244B variant (including N74F244DB,112) does not offer an industrial-grade (-40°C to +85°C) version - that option applies only to the non-B DIP and SO packages (e.g., I74F244N). This is confirmed in the Philips ordering information table.
Does N74F244DB,112 support true bidirectional data flow?
No - the N74F244DB,112 is a unidirectional octal buffer with fixed input-to-output direction (Ia→Ya, Ib→Yb). It lacks internal direction control or bus transceiver logic. Bidirectional operation requires external control of OEa/OEb and complementary driver/receiver pairing - the device itself does not auto-sense or reverse data path direction.
What is the maximum capacitive load the N74F244DB,112 can drive reliably?
The N74F244DB,112 is characterized for CL = 50pF in AC specifications, with propagation delay and timing parameters guaranteed under that load. While it can physically drive >100pF due to its 64mA sink capability, timing margins degrade beyond 50pF - designers should verify setup/hold at target load using the tPLH/tPHL curves and derate for trace capacitance.
Is N74F244DB,112 pin-compatible with standard 74F244 in SSOP-20?
Yes - N74F244DB,112 is the 74F244B variant in SSOP-20 (SOT339-1) and shares identical pinout, electrical interface, and logic function with non-B 74F244 SSOP versions (e.g., N74F244D). The "B" suffix denotes internal enhancements (skew, ICC, IIL), not pin or functional changes.
Can N74F244DB,112 be used with 3.3V logic systems?
No - the N74F244DB,112 is strictly a 5V device with VCC = 4.5V–5.5V and TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max). Interfacing to 3.3V systems requires level translation; direct connection risks undefined logic states or excessive input current due to VIH mismatch.
N74F244DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SSOP
N74F244DB,112 FAQ
1.How can I place an order for N74F244DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F244DB,112 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 N74F244DB,112 reliable?
The price and inventory of N74F244DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F244DB,112 is usually 5 days.
3.What payment methods are accepted for N74F244DB,112?
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4.How is shipping managed for N74F244DB,112?
N74F244DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F244DB,112 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 N74F244DB,112?
For technical support, including N74F244DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F244DB,112 requirements.
6.How does Aetrix verify that N74F244DB,112 is sourced from the original manufacturer or authorized distributors?
All N74F244DB,112 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 N74F244DB,112 meets industry standards.
7.What is the process for return or replacement of N74F244DB,112?
All N74F244DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with N74F244DB,112, 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 N74F244DB,112 part is unused and in its original packaging.
Return procedure for N74F244DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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