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NXP Semiconductors N74F1244N,602
- Part No.:
- N74F1244N,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
N74F1244N,602.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,902
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Product details
Overview
N74F1244N,602 from Philips Semiconductors is an octal 3-state non-inverting buffer IC designed for bus interface and memory address register driving in TTL-compatible systems. It features dual active-low output enables (OEa, OEb), sinks up to 64mA per output, sources up to 15mA, and delivers 4.5ns typical propagation delay at 5V with 43mA typical supply current.
For engineers reviewing the N74F1244N,602 datasheet, N74F1244N,602 pinout, N74F1244N,602 application, or N74F1244N,602 equivalent, key selection considerations include its 20-pin DIP package, 1/30th bus loading versus 74F244, high-impedance NPN base inputs (20µA), and compatibility with MOS microprocessor interfacing requirements.
Technical Context
The N74F1244N,602 implements two independent 4-bit 3-state output groups controlled by OEa and OEb, enabling selective bus isolation without external logic. Its input structure uses high-impedance NPN bases to limit loading to 20µA in both HIGH and LOW states, reducing fan-out burden on upstream drivers.
It operates strictly within commercial temperature range (0°C to +70°C) and 5V ±10% supply, with absolute maximum ratings including VCC = –0.5V to +7.0V and IOL = 128mA (short-term). DC characteristics specify VIH = 2.0V min, VIL = 0.8V max, VOH = 2.7V min at –3mA, and VOL = 0.55V max at 64mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5V–5.5V - Ensures stable operation across standard TTL power rail tolerances. |
| Propagation delay | 4.5ns typical - Enables high-speed bus buffering in fast microprocessor address/data paths. |
| Output drive | Sinks 64mA / sources 15mA - Supports direct connection to heavy capacitive loads and legacy TTL buses. |
| Input loading | 20µA HIGH/LOW - Reduces loading on preceding logic stages by >96% vs. 74F244. |
| Bus loading | 1/30th of 74F244 - Allows significantly higher fan-out without signal integrity degradation. |
| Operating temperature | 0°C to +70°C - Validated for commercial-grade embedded control and computing applications. |
| Output enable control | Dual active-low OEa/OEb - Permits independent gating of two 4-bit data lanes for flexible bus arbitration. |
Pinout & Package
Package: 20-pin plastic DIP (SOT146-1), 300-mil width, through-hole mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low output enable for Ya0–Ya3; asserts 3-state when HIGH. |
| 2–5, 18–15 | Ia0–Ia3, Ya0–Ya3 | Group A input/output pair (non-inverting); Ya outputs driven only when OEa = LOW. |
| 19 | OEb | Active-low output enable for Yb0–Yb3; independent control from OEa. |
| 11–14, 13–10 | Ib0–Ib3, Yb0–Yb3 | Group B input/output pair; Yb outputs enabled only when OEb = LOW. |
| 10 | GND | Ground reference for all logic and output stages. |
| 20 | VCC | +5V supply pin; decoupling capacitor placement critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| High-impedance NPN base inputs | 20µA input current in both logic states - minimizes loading on upstream drivers and improves system-level fan-out. |
| Dual independent 3-state controls | OEa and OEb each gate four outputs - enables selective bus segment isolation without additional logic gates. |
| Low bus loading ratio | 1/30th that of 74F244 - allows more devices per bus segment while maintaining timing margins. |
| Robust output drive | 64mA sink / 15mA source capability - interfaces directly with TTL, LSTTL, and early CMOS loads without buffers. |
| Fast propagation | 4.5ns typical tPLH/tPHL - supports address/data latching in sub-10ns clock domains. |
Applications
| Microprocessor Address Bus Interface | Memory Address Register Buffering |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a Z80 or 8085 CPU to multiple memory chips. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU address outputs during DMA cycles. Use Value: Dual OE control allows CPU and DMA controller to share address bus without contention; 64mA sink handles parallel memory load capacitance. |
Use Scenario: Latching and distributing decoded memory bank select signals in a multi-bank RAM system. IC Role / Device Role / Timing Role: Octal buffer amplifying low-drive address decoder outputs to drive multiple bank-enable inputs. Use Value: 20µA input loading prevents decoder output overload; 4.5ns delay preserves setup/hold timing across banks. |
| Legacy System Bus Expansion | TTL-Compatible Peripheral Interface |
|
Use Scenario: Adding ISA-style expansion slots to industrial control backplanes with limited drive strength. IC Role / Device Role / Timing Role: Bidirectional bus driver (with external direction control) for add-on card address/data multiplexing. Use Value: Pin-for-pin compatibility with 74F244 simplifies retrofit; 1/30th bus loading extends slot count without repeaters. |
Use Scenario: Interfacing 8-bit microcontrollers to legacy TTL peripherals (e.g., parallel printers, LED displays). IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer between low-current MCU GPIO and high-load peripheral inputs. Use Value: 15mA sourcing capability ensures reliable HIGH-level signaling to TTL inputs; OE control enables software-managed peripheral enable. |
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 | Higher bus loading (30×), 6ns typical propagation, identical pinout and logic function. | Acceptable where fan-out margin is sufficient and speed penalty is tolerable. | Use when legacy design reuse is prioritized over power/load optimization. |
| 74ACT244PC | CMOS technology, 5V tolerant, 12mA output drive, 7ns propagation, 4.5V–5.5V supply. | Lower power but reduced drive; requires verification of downstream TTL input thresholds. | Prefer for mixed-voltage systems needing lower ICCZ (2µA vs. 43mA typical). |
Compared with SN74F244N and 74ACT244PC, the N74F1244N,602 uniquely balances ultra-low bus loading, TTL-compatible drive strength, and proven reliability in vintage computing and industrial control bus architectures - making it the optimal choice where legacy interoperability and signal integrity coexist.
Availability
N74F1244N,602 is available at Aetrix Electronics and suitable for microprocessor address bus interface, memory address register buffering, and legacy system bus expansion requiring stable component supply and long-lifecycle support.
Supply support for N74F1244N,602 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 pioneer in bipolar TTL logic, delivering high-reliability discrete and integrated solutions for industrial, computing, and communications systems since the 1960s.
The 74F family was engineered for high-speed, low-power TTL-compatible operation in microprocessor-based systems - with the N74F1244N,602 specifically optimized for bus loading reduction and MOS microprocessor interfacing.
FAQ
What is the pin configuration of the N74F1244N,602?
The N74F1244N,602 uses a 20-pin DIP package with pin 1 = OEa, pins 2–5 = Ia0–Ia3, pins 15–18 = Ya0–Ya3, pin 10 = GND, pin 20 = VCC, pin 19 = OEb, and pins 11–14/Ib0–Ib3 and 13–10/Yb0–Yb3 arranged per the official Philips pin diagram. Pinout matches 74F244 but with distinct internal loading characteristics.
Is the N74F1244N,602 pin-compatible with the 74F244?
Yes, the N74F1244N,602 is pin-for-pin and functionally compatible with the 74F244 per Philips documentation, sharing identical pin assignments and logic behavior. However, it delivers significantly lower bus loading (1/30th) and faster propagation (4.5ns vs. 6ns typical), making it a performance-enhanced drop-in replacement.
What are the absolute maximum ratings for the N74F1244N,602?
The N74F1244N,602 has absolute maximum ratings of VCC = –0.5V to +7.0V, VIN = –0.5V to +7.0V, IOUT (low) = 128mA, and operating temperature = 0°C to +70°C. Exceeding these limits may impair device life; recommended operating conditions specify VCC = 4.5–5.5V and Tamb = 0–70°C.
Does the N74F1244N,602 support mixed-voltage interfacing?
No, the N74F1244N,602 is a 5V-only TTL device with VIH = 2.0V min and VIL = 0.8V max. It does not support 3.3V or lower logic families directly; level translation is required for interfacing with modern low-voltage MCUs or FPGAs.
What is the significance of the "N" suffix in N74F1244N,602?
The "N" in N74F1244N,602 denotes the 20-pin plastic DIP package (SOT146-1) per Philips ordering nomenclature. The "602" suffix indicates tape-and-reel packaging variant; the base part number N74F1244N identifies the DIP version, distinguishing it from the SO20 variant N74F1244D.
N74F1244N,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-DIP
N74F1244N,602 FAQ
1.How can I place an order for N74F1244N,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F1244N,602 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 N74F1244N,602 reliable?
The price and inventory of N74F1244N,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F1244N,602 is usually 5 days.
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Once your N74F1244N,602 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 N74F1244N,602?
For technical support, including N74F1244N,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F1244N,602 requirements.
6.How does Aetrix verify that N74F1244N,602 is sourced from the original manufacturer or authorized distributors?
All N74F1244N,602 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 N74F1244N,602 meets industry standards.
7.What is the process for return or replacement of N74F1244N,602?
All N74F1244N,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F1244N,602, 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 N74F1244N,602 part is unused and in its original packaging.
Return procedure for N74F1244N,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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