My Inquiry
My Account
NXP Semiconductors N74F244N,602
- Part No.:
- N74F244N,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
N74F244N,602.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,983
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
N74F244N,602 from Philips Semiconductors 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 per output, 4.0ns typical propagation delay at 5V, and operates across 0°C to +70°C commercial temperature range in a 20-pin plastic DIP package.
For engineers reviewing the N74F244N,602 datasheet, N74F244N,602 pinout, N74F244N,602 application, or N74F244N,602 equivalent, key selection criteria include 3-state bus contention control, high-current drive for capacitive loads, industrial-grade noise immunity requirements, and legacy TTL system compatibility with 5V ±10% supply.
Technical Context
The N74F244N,602 implements two independent 4-bit non-inverting buffer groups, each controlled by its own active-low enable input (OEa for Ya0–Ya3, OEb for Yb0–Yb3). All outputs enter high-impedance state when respective enable is high, enabling bidirectional bus sharing without external logic.
It uses standard bipolar F (Fast) TTL process technology with guaranteed 64mA low-level output current and 15mA high-level sourcing - critical for driving multiple TTL inputs or transmission lines. Propagation delay is specified at 4.0ns (typical) under CL = 50pF, RL = 500Ω conditions, with output skew ≤5.2ns across all eight outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures stable operation within standard TTL 5V rail tolerance |
| Propagation Delay (tPLH/tPHL) | 4.0ns typical - enables reliable timing in 25MHz+ synchronous bus systems |
| Output Sink Current (IOL) | 64mA per output - drives up to 16 standard TTL loads (1 U.L. = 0.6mA low) |
| Output Source Current (IOH) | 15mA per output - supports fan-out to 15 TTL inputs in high state |
| Input Leakage (IIL/IIH) | ±1.6mA low / ±20µA high - minimizes static loading on upstream drivers |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control and instrumentation |
| Package Type | 20-pin plastic DIP (SOT146-1) - compatible with through-hole PCB assembly and socketing |
Pinout & Package
Package: 20-pin plastic dual in-line package (DIP), body width 300 mil, SOT146-1 footprint, lead pitch 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low enable for Ya0–Ya3 outputs - asserts 3-state disable when high |
| 2–5 | Ia0–Ia3 | Data inputs for first buffer group - directly drive Ya0–Ya3 when OEa low |
| 6–9 | Yb0–Yb3 | Outputs of second buffer group - driven by Ib0–Ib3 when OEb low |
| 10 | GND | Ground reference - common return path for all I/O and supply currents |
| 11–14 | Ia2–Ia3, Ib0–Ib1 | Additional data inputs - completes full octal input set (Ia0–Ia3, Ib0–Ib3) |
| 15–18 | Ya2–Ya3, Yb2–Yb3 | Remaining outputs - completes octal 3-state output set (Ya0–Ya3, Yb0–Yb3) |
| 19 | OEb | Active-low enable for Yb0–Yb3 - independent control of second buffer group |
| 20 | VCC | +5V supply - powers internal logic and output stages; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | OEa and OEb allow selective activation of Ya0–Ya3 or Yb0–Yb3 - eliminates need for external gating in split-bus architectures |
| 64mA output sink capability | Drives heavy capacitive loads (e.g., long traces, multiple TTL inputs) without signal degradation or timing violation |
| 15mA high-level sourcing | Ensures valid VOH > 2.7V into 15 TTL inputs - maintains noise margin in mixed-logic systems |
| Guaranteed 4.0ns propagation delay | Supports 25MHz clock domains with setup/hold margin in address/data latching applications |
| High-impedance 3-state outputs | Enables time-multiplexed bus sharing between CPU, DMA, and peripheral controllers without contention |
Applications
| Memory Address Buffering | Microprocessor Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM chips with trace capacitance >100pF. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing level translation and current gain between MCU address pins and memory address inputs. Use Value: 64mA sink current prevents address line droop during write cycles; 4.0ns delay ensures address stability before memory access window closes. |
Use Scenario: Isolating and buffering data bus between 80C51 MCU and parallel LCD controller with shared bus arbitration. IC Role / Device Role / Timing Role: 3-state octal driver enabling bidirectional data flow control via OEa/OEb signals synchronized to WR/RD strobes. Use Value: Independent enables allow simultaneous read/write isolation; high-impedance state prevents bus contention during idle cycles. |
| Industrial I/O Expansion | Legacy System Bus Repeater |
Use Scenario: Extending TTL-level digital I/O from PLC mainboard to remote terminal units over 30cm PCB traces. IC Role / Device Role / Timing Role: Signal repeater amplifying weak MCU GPIO outputs to drive longer traces and multiple downstream receivers. Use Value: Low output impedance (<10Ω typical) maintains signal integrity across 30cm FR4 traces; 0°C to +70°C rating matches industrial enclosure ambient. |
Use Scenario: Re-timing and regenerating 8-bit control bus signals in aging test equipment using obsolete 74LS logic. IC Role / Device Role / Timing Role: Fast TTL-compatible buffer restoring edge rates degraded by long backplane traces and multiple fan-outs. Use Value: 4.0ns propagation delay matches LS-series timing budgets; 5V ±10% supply tolerance ensures compatibility with legacy power rails. |
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 | Identical pinout, same 4.0ns delay and 64mA/15mA drive, but TI-manufactured with minor AC parameter tolerances (e.g., tPZL max 8.0ns vs 7.0ns) | Drop-in replacement in TI-based designs; requires validation of enable timing margins in high-speed bus arbitration | Select when sourcing from TI distribution channels or when cross-manufacturer BOM consolidation is required |
| 74ACT244PC | CMOS process, 5V-only supply, 12mA/24mA drive, 6.5ns typical delay, lower ICC (20µA typ), wider VCC noise rejection | Better for low-power or mixed-voltage systems; insufficient drive for legacy TTL loads requiring >15mA high-level sourcing | Prefer for new designs targeting lower power and higher noise immunity; avoid where 15mA IOH is mandatory for TTL fan-out |
Compared with SN74F244N and 74ACT244PC, the N74F244N,602 delivers superior high-level sourcing (15mA vs 12mA) and tighter propagation delay consistency (4.0ns typ), making it optimal for legacy TTL bus systems demanding robust drive strength and precise timing alignment.
Availability
N74F244N,602 is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus interfacing, industrial I/O expansion, and legacy system bus repeater applications requiring stable component supply and long-term obsolescence management.
Supply support for N74F244N,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 European semiconductor pioneer known for foundational TTL, CMOS, and analog product families developed from the 1960s onward.
The 74F logic family - including the N74F244N,602 - was engineered for high-speed, high-drive digital interfacing in industrial control, telecommunications, and computing systems requiring robust 5V TTL compatibility.
FAQ
What is the maximum operating temperature range for the N74F244N,602?
The N74F244N,602 is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial range (–40°C to +85°C); that specification applies only to the N74F244N variant without the ",602" suffix, as confirmed in the Philips ordering information table.
Does the N74F244N,602 support 3.3V operation?
No, the N74F244N,602 requires a 4.5V to 5.5V supply per its Recommended Operating Conditions. It is incompatible with 3.3V logic families due to input threshold levels (VIH = 2.0V min, VIL = 0.8V max) and output voltage specifications tied to 5V operation.
How many outputs can be actively driven simultaneously on the N74F244N,602?
All eight outputs (Ya0–Ya3 and Yb0–Yb3) of the N74F244N,602 can be driven simultaneously when both OEa and OEb are asserted low. Total supply current remains within specification (ICCL ≤ 90mA max) even under full-load conditions per the DC electrical characteristics table.
What is the meaning of the ",602" suffix in N74F244N,602?
The ",602" suffix denotes a specific packaging and marking variant per Philips' ordering nomenclature: it identifies the 20-pin plastic DIP (SOT146-1) package with commercial temperature range and standard Philips date-code and logo marking, distinct from SSOP or industrial-grade versions.
Can the N74F244N,602 replace a 74LS244 in an existing design?
Yes, the N74F244N,602 is pin-compatible and electrically compatible with 74LS244, offering faster propagation delay (4.0ns vs ~15ns), higher output drive (64mA vs 8mA), and improved noise margins - but requires verification of increased ICC and potential ground bounce in dense layouts.
N74F244N,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
N74F244N,602 FAQ
1.How can I place an order for N74F244N,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F244N,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 N74F244N,602 reliable?
The price and inventory of N74F244N,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F244N,602 is usually 5 days.
3.What payment methods are accepted for N74F244N,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F244N,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F244N,602?
N74F244N,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F244N,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 N74F244N,602?
For technical support, including N74F244N,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F244N,602 requirements.
6.How does Aetrix verify that N74F244N,602 is sourced from the original manufacturer or authorized distributors?
All N74F244N,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 N74F244N,602 meets industry standards.
7.What is the process for return or replacement of N74F244N,602?
All N74F244N,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F244N,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 N74F244N,602 part is unused and in its original packaging.
Return procedure for N74F244N,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
N74F244N,602 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
