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NXP Semiconductors N74F244BN,602
- Part No.:
- N74F244BN,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
N74F244BN,602.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,409
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Product details
Overview
N74F244BN,602 from Philips Semiconductors is a 20-pin plastic DIP octal 3-state buffer IC designed for bus interface and memory address register driving. It features dual active-low output enables (OEa/OEb), 64mA sink/15mA source drive capability, 4.0ns typical propagation delay, and operates over 0°C to +70°C commercial temperature range.
For engineers reviewing the N74F244BN,602 datasheet, N74F244BN,602 pinout, N74F244BN,602 application, or N74F244BN,602 equivalent, key selection criteria include 3-state bus driving strength, output skew control, industrial-grade noise immunity options, and legacy TTL-compatible logic level compatibility at 5V.
Technical Context
The N74F244BN,602 implements two independent 4-bit non-inverting buffer groups, each controlled by its own active-low 3-state enable input (OEa for Ya0–Ya3, OEb for Yb0–Yb3). All outputs are TTL-compatible with guaranteed VOH ≥2.5V at IOH = –15mA and VOL ≤0.55V at IOL = 64mA under VCC = 4.5V min.
It uses standard FAST TTL process technology with bipolar transistor design, delivering 53mA typical total supply current (ICC) at 5V/25°C and supporting capacitive loads up to 50pF with defined AC timing across commercial temperature range. Ground bounce reduction features apply only to the 74F244B variant, not this specific part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FAST TTL - ensures compatibility with 74F-series systems and robust noise margin vs. standard TTL |
| Propagation Delay | 4.0ns typical - enables reliable operation in high-speed address/data bus applications up to ~200MHz clock domains |
| Output Drive | 64mA sink / 15mA source - supports direct driving of multiple TTL inputs or moderate PCB trace capacitance |
| Supply Voltage | 4.5V to 5.5V - tight 5V ±10% tolerance ensures stable operation across standard logic rail variations |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for office, computing, and non-extended-environment embedded systems |
| Input Loading | 1.0/2.67 FAST unit loads (HI/LO) - defines fan-out capability: up to 2.67 standard TTL loads in low state |
| Package Type | 20-pin plastic DIP (SOT146-1) - through-hole mounting compatible with legacy prototyping and wave-soldered PCBs |
Pinout & Package
20-pin plastic dual in-line package (DIP), body width 300 mil, SOT146-1 footprint. Pin 10 = GND, Pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEa, OEb | Active-low output enable controls Ya0–Ya3 and Yb0–Yb3 independently; enables bus arbitration |
| 2–5, 11–14 | Ia0–Ia3, Ib0–Ib3 | Data inputs for respective buffer groups; TTL-compatible voltage thresholds (VIH ≥2.0V, VIL ≤0.8V) |
| 18, 16, 14, 12, 17, 15, 13, 11 | Ya0–Ya3, Yb0–Yb3 | Non-inverting 3-state outputs; high-impedance when OE asserted; drive strength supports bus loading |
| 10 | GND | Power ground reference; all internal logic and output stages referenced to this node |
| 20 | VCC | +5V supply rail; decoupling capacitor required near pin for stable high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | OEa and OEb allow selective activation of two separate 4-bit data paths without external gating logic |
| High-current 3-state outputs | 64mA sink capability per output enables direct connection to unterminated buses or multiple TTL inputs |
| TTL-compatible input thresholds | VIH ≥2.0V and VIL ≤0.8V ensure interoperability with legacy 74LS/74F logic families without level shifting |
| Controlled propagation delay | 4.0ns typical tPLH/tPHL guarantees deterministic timing for synchronous bus designs with known setup/hold windows |
| Low input current | IIL = –1.6mA max and IIH = 20µA max minimize loading on upstream drivers and reduce system power |
Applications
| Memory Address Buffering | Microprocessor Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing isolation and drive strength between CPU address pins and memory address inputs. Use Value: Dual OE control allows interleaved access to separate memory banks while maintaining signal integrity across 15cm traces. | Use Scenario: Isolating bidirectional data bus segments in an 8-bit microcontroller system with peripheral expansion slots. IC Role / Device Role / Timing Role: Direction-controlled bus driver enabling clean separation of master and slave data paths during read/write cycles. Use Value: 64mA sink capability handles combined capacitive load of 8 peripherals without signal degradation at 8MHz bus speed. |
| Legacy System Backplane Driver | Industrial Control I/O Expansion |
Use Scenario: Replacing failed buffers on a 1990s-era industrial PLC backplane where space and pinout are fixed. IC Role / Device Role / Timing Role: Drop-in replacement for original 74F244-based bus repeater modules requiring identical DIP20 footprint and timing. Use Value: 4.0ns propagation delay matches original system timing budget; 0°C to +70°C rating aligns with installed base environmental envelope. | Use Scenario: Adding isolated digital I/O capability to a programmable logic controller via modular daughterboard. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between FPGA I/O bank and external relay driver array. Use Value: Dual OE inputs synchronize output activation with FPGA control signals, preventing bus contention during configuration transitions. |
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 electrical specs, same FAST TTL family, same DIP20 package; Texas Instruments second-source version | No functional difference; fully interchangeable in legacy designs requiring TI-branded components | Select SN74F244N when TI qualification or supply chain diversification is required |
| 74ACT244PC | Advanced CMOS (ACT) family; 5V tolerant, lower ICC (20mA typ), but higher VIH (3.5V min) and different AC timing (5.5ns max) | Not drop-in: requires verification of upstream driver VOH compatibility and timing margin recalculation | Choose 74ACT244PC only if lower power and CMOS noise immunity outweigh timing and voltage threshold trade-offs |
Compared with SN74F244N, N74F244BN,602 offers identical performance and fit; versus 74ACT244PC, it provides guaranteed TTL-level compatibility and faster propagation but higher supply current and less noise immunity.
Availability
N74F244BN,602 is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus interface, and legacy system backplane driver applications requiring stable component supply and long-term obsolescence management.
Supply support for N74F244BN,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) was a leading European semiconductor manufacturer specializing in logic, analog, and automotive ICs before its semiconductor division was acquired in 2006.
The 74F244 product line was developed for high-speed TTL-compatible bus interfacing in computing and industrial control systems, emphasizing drive strength, timing predictability, and backward compatibility with earlier 74-series logic.
FAQ
What is the maximum output sink current specification for N74F244BN,602?
The N74F244BN,602 specifies a guaranteed low-level output current (IOL) of 64mA per output pin under recommended operating conditions (VCC = 4.5V min, Tamb = 25°C). This value is confirmed in the DC Electrical Characteristics table and applies to all eight Y outputs (Ya0–Ya3, Yb0–Yb3) when actively driven low and not in high-impedance state.
Does N74F244BN,602 support industrial temperature range operation?
No, N74F244BN,602 is rated for commercial temperature range only (0°C to +70°C). Industrial range (–40°C to +85°C) is specified only for the I74F244N variant per the Ordering Information table; N74F244BN,602 corresponds to the commercial-grade N74F244N/N74F244BN ordering code with SOT146-1 DIP package.
What is the typical supply current consumption of N74F244BN,602 at 5V?
The N74F244BN,602 has a typical total supply current (ICC) of 53mA at VCC = 5.0V and Tamb = 25°C, as stated in the Product Specification table on page 2. This value represents quiescent current under active drive conditions and excludes transient peaks during switching.
Is N74F244BN,602 pin-compatible with the 74F244B variant?
Yes, N74F244BN,602 is pin-compatible with all 74F244 and 74F244B variants in the same 20-pin DIP package (SOT146-1), including identical pin numbering and function mapping. However, the 74F244B offers reduced ICC (33mA typ), lower input current (IIL = –40µA), and improved noise immunity - features not present in the N74F244BN,602.
What logic family does N74F244BN,602 belong to, and what are its voltage thresholds?
N74F244BN,602 belongs to the FAST TTL logic family. Its input voltage thresholds are VIH ≥2.0V (minimum high-level input voltage) and VIL ≤0.8V (maximum low-level input voltage), ensuring interoperability with standard 74LS and other TTL-compatible sources without level translation.
N74F244BN,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
N74F244BN,602 FAQ
1.How can I place an order for N74F244BN,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F244BN,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 N74F244BN,602 reliable?
The price and inventory of N74F244BN,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F244BN,602 is usually 5 days.
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5.How can I obtain technical support or documentation for N74F244BN,602?
For technical support, including N74F244BN,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F244BN,602 requirements.
6.How does Aetrix verify that N74F244BN,602 is sourced from the original manufacturer or authorized distributors?
All N74F244BN,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 N74F244BN,602 meets industry standards.
7.What is the process for return or replacement of N74F244BN,602?
All N74F244BN,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F244BN,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 N74F244BN,602 part is unused and in its original packaging.
Return procedure for N74F244BN,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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