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onsemi 74LCX2244SJX
- Part No.:
- 74LCX2244SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LCX2244SJX.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
74LCX2244SJX from Fairchild Semiconductor is an octal non-inverting 3-STATE buffer/line driver designed for low-voltage (2.3V–3.6V) VCC operation with 5V-tolerant inputs and outputs, integrated 26Ω output series resistors, 7.5 ns max propagation delay at 3.3V, and ±12 mA drive capability at 3.0V - used in memory address buffering and bus interface applications.
For engineers reviewing the 74LCX2244SJX datasheet, pinout, applications, or equivalent options, key selection considerations include 5V tolerance in mixed-voltage systems, output impedance control for signal integrity, 3-STATE bus contention management, and compatibility with SOIC-20 (M20D) footprint for legacy board reuse.
Technical Context
The 74LCX2244SJX implements eight independent non-inverting buffers, each with dual active-low 3-STATE enable inputs (OE1, OE2), enabling per-group output control. Its advanced CMOS process delivers high-speed switching while maintaining low ICC (≤10 µA quiescent) and robust latch-up immunity (>500 mA).
All I/O pins tolerate 0–5.5V regardless of VCC (2.3–3.6V), supporting interoperability between 2.5V/3.3V logic domains and 5V peripherals. The built-in 26Ω series resistors suppress output overshoot/undershoot without external termination, reducing EMI and simplifying PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V system rails with guaranteed operation across full industrial temperature range. |
| Propagation Delay (tPD) | 7.5 ns max at VCC = 3.3V, CL = 50pF - enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| Output Drive | ±12 mA at VCC = 3.0V - sufficient to drive multiple TTL loads or terminated transmission lines without external buffers. |
| I/O Voltage Tolerance | 0V to 5.5V on all inputs/outputs - allows direct connection to 5V signals without level shifters in mixed-voltage designs. |
| Output Series Resistor | 26Ω integrated - reduces ringing and EMI on PCB traces, eliminating need for discrete series termination resistors. |
| Quiescent ICC | 10 µA max - minimizes standby power in battery-backed or always-on subsystems. |
| ESD Rating | Human Body Model > 2000V - provides robust handling margin during assembly and field service. |
Pinout & Package
74LCX2244SJX is packaged in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Code M20D), with standard SOIC-20 footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 10, 11, 13 | Input (I0–I7) | Non-inverting data inputs; 5V tolerant, accept 0–5.5V logic levels independent of VCC. |
| 3, 5, 7, 9 | OE2 (Enable Group 2) | Active-low 3-STATE enable for outputs O0–O3; tied low to activate group, high to place in high-impedance state. |
| 12, 14, 16, 18 | OE1 (Enable Group 1) | Active-low 3-STATE enable for outputs O4–O7; independent control enables partial bus isolation. |
| 15, 17, 19, 20, 2, 4, 6, 8, 10, 11 | Output (O0–O7) | Buffered non-inverting outputs with integrated 26Ω series resistance; 5V tolerant, support hot-swap via high-impedance power-down state. |
| 19 | VCC | Positive supply pin (2.3–3.6V); powers internal logic and output drivers. |
| 10 | GND | Ground reference for all I/O and internal circuitry; must be low-inductance connection for noise control. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables direct interfacing with 5V peripherals in 2.5V/3.3V systems without external level translation. |
| Integrated 26Ω output resistors | Reduces signal reflections and EMI on PCB traces, eliminating discrete termination components and associated layout area. |
| Dual independent 3-STATE enables (OE1/OE2) | Allows selective disabling of two 4-bit output groups (O0–O3 and O4–O7), supporting segmented bus arbitration and power gating. |
| Live insertion/withdrawal support | High-impedance inputs/outputs during power transitions prevent bus contention when hot-plugging into live backplanes or modules. |
| Patented noise/EMI reduction circuitry | Minimizes simultaneous switching noise (SSN) during multi-bit transitions, improving signal integrity in dense layouts. |
Applications
| Memory Address Buffering | PCI/ISA Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a 3.3V microcontroller to a 5V SRAM or EPROM in embedded instrumentation. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control isolates address bus during DMA cycles and ensures clean edge delivery to memory chips. Use Value: 5V-tolerant outputs eliminate level shifters; 26Ω series resistors suppress ringing on long address traces, preserving setup/hold timing margins. |
Use Scenario: Interfacing a 3.3V FPGA-based peripheral card to a legacy 5V PCI slot for industrial control I/O expansion. IC Role / Device Role / Timing Role: Bidirectional bus transceiver buffer managing direction control and voltage domain bridging between host and add-in card. Use Value: Dual OE pins allow synchronized enable/disable of address/data segments; ±12 mA drive meets PCI loading requirements without fanout buffers. |
| Hot-Swappable Module Backplane | Low-Power Industrial Controller |
|
Use Scenario: Buffering configuration signals (e.g., IDSEL, FRAME#) on a modular PLC backplane where cards are inserted/removed under power. IC Role / Device Role / Timing Role: 3-STATE line driver providing controlled high-Z state during power-up/down sequences to prevent bus conflicts. Use Value: Power-down high-impedance behavior and live insertion support ensure safe hot-swap operation without system reset or glitch propagation. |
Use Scenario: Isolating real-time clock and sensor interface lines in a battery-powered environmental monitor operating at 2.5V. IC Role / Device Role / Timing Role: Low-quiescent-current buffer (10 µA ICC) extending battery life while maintaining precise timing signal integrity to RTC and ADC. Use Value: Sub-10 µA standby current and 7.5 ns tPD enable responsive wake-up and accurate timestamping without compromising energy budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC244APW,118 (Nexperia) | Same 20-pin TSSOP package, 3.3V-only I/O tolerance (no 5V tolerance), lower 3.5 ns tPD, no integrated series resistors. | Requires external termination and level shifters for 5V interfaces; better suited for pure 3.3V systems demanding higher speed. | Select when board operates exclusively at 3.3V and maximum speed is prioritized over mixed-voltage simplicity. |
| SN74LVCH244AQPWRQ1 (TI) | Automotive-grade AEC-Q100 qualified, 3.3V VCC only, 5V-tolerant I/O, no integrated resistors, 6.5 ns tPD, enhanced ESD (4 kV HBM). | Targeted for automotive infotainment and ADAS modules requiring qualification and extended temperature range (−40°C to +125°C). | Select for automotive applications needing qualification and wider temp range; omit if cost-sensitive or non-automotive. |
Compared with 74LCX2244SJX, the 74LVC244APW offers faster propagation but lacks 5V tolerance and output resistors - increasing BOM count and design complexity in mixed-voltage systems. The SN74LVCH244AQPWRQ1 adds automotive qualification and higher ESD rating but at premium cost and no integrated termination benefit.
Availability
74LCX2244SJX is available at Aetrix Electronics and suitable for memory address buffering, PCI/ISA bus interfacing, hot-swappable module backplanes, and low-power industrial controllers requiring stable component supply and long-term obsolescence management.
Supply support for 74LCX2244SJX 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
Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74LCX family was engineered for low-voltage, high-speed bus interface applications in mixed-signal systems - specifically targeting interoperability between emerging 2.5V/3.3V logic and legacy 5V peripherals without external level-shifting circuitry.
FAQ
What is the maximum supply voltage for 74LCX2244SJX?
The 74LCX2244SJX has an absolute maximum VCC rating of +7.0V, but its recommended operating range is strictly 2.3V to 3.6V. Operation outside this window may cause parametric failure or reduced reliability. The 74LCX2244SJX is not rated for continuous 5V VCC operation - doing so violates the device's specified conditions and risks functional instability.
Does 74LCX2244SJX support hot-swap operation?
Yes, the 74LCX2244SJX supports live insertion and withdrawal per manufacturer documentation. Its power-down high-impedance inputs and outputs, combined with controlled 3-STATE behavior during VCC ramp-up/down, prevent bus contention. For reliable hot-swap, OE pins should be pulled up to VCC via appropriate resistors as specified in the datasheet to ensure defined initial state.
Are the 26Ω series resistors in 74LCX2244SJX internal or external?
The 26Ω series resistors in the 74LCX2244SJX are monolithically integrated within the output driver stage - they are not external components. This integration eliminates the need for discrete series termination resistors on the PCB, reduces layout area, and ensures consistent impedance matching across all eight outputs of the 74LCX2244SJX.
Can 74LCX2244SJX drive standard TTL loads?
Yes, the 74LCX2244SJX can drive standard TTL loads when operated at VCC = 3.0V or 3.3V, delivering ±12 mA output current. Its VOH and VOL specifications meet TTL input thresholds (≥2.4V HIGH, ≤0.8V LOW) under these conditions, making it suitable for interfacing with legacy 5V TTL devices without additional buffering - a key function of the 74LCX2244SJX in upgrade paths.
What is the pin-compatible replacement for 74LCX2244SJX in SOIC-20?
The 74LCX2244WM (SOIC-20, Package M20B) is a pin-compatible variant of the same device, differing only in package type - not electrical or functional characteristics. Both share identical pinout, logic behavior, and specifications. The 74LCX2244SJX (SOP, M20D) and 74LCX2244WM are mechanically distinct but electrically interchangeable in designs where footprint allows.
74LCX2244SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74LCX2244SJX FAQ
1.How can I place an order for 74LCX2244SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX2244SJX 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 74LCX2244SJX reliable?
The price and inventory of 74LCX2244SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX2244SJX is usually 5 days.
3.What payment methods are accepted for 74LCX2244SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX2244SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX2244SJX?
74LCX2244SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX2244SJX 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 74LCX2244SJX?
For technical support, including 74LCX2244SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX2244SJX requirements.
6.How does Aetrix verify that 74LCX2244SJX is sourced from the original manufacturer or authorized distributors?
All 74LCX2244SJX 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 74LCX2244SJX meets industry standards.
7.What is the process for return or replacement of 74LCX2244SJX?
All 74LCX2244SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX2244SJX, 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 74LCX2244SJX part is unused and in its original packaging.
Return procedure for 74LCX2244SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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