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onsemi 74LCX16244GX
- Part No.:
- 74LCX16244GX
- Manufacturer:
- onsemi
- Package:
- 54-LFBGA
- Datasheet:
-
74LCX16244GX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 54FBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
74LCX16244GX from onsemi is a low-voltage 16-bit non-inverting buffer/line driver with 5 V tolerant inputs and outputs, designed for memory/address bus driving, clock distribution, and bidirectional bus interfacing in mixed-voltage systems. It operates from 1.65 V to 5.5 V VCC, delivers 4.5 ns max propagation delay at 3.3 V, supports 24 mA output drive, and features nibble-level 3-STATE control via four independent OE inputs.
For engineers reviewing the 74LCX16244GX datasheet, pinout, applications, or equivalent options, key selection considerations include 5 V tolerance in 2.5/3.3 V systems, high-speed 16-bit bus buffering with independent nibble enable, low ICCQ (≤10 µA), live insertion support, and TSSOP-48 packaging for space-constrained PCB layouts.
Technical Context
The 74LCX16244GX implements sixteen identical non-inverting buffers grouped into four independent 4-bit nibbles, each controlled by its own active-low Output Enable (OEn) input. This architecture enables selective 4-bit, 8-bit, or full 16-bit bus gating without requiring external logic.
Its 5 V tolerant I/O allows direct interface between 3.3 V or 2.5 V logic domains and legacy 5 V buses or peripherals, while patented noise/EMI reduction circuitry minimizes switching noise during high-speed transitions. Power-down high-impedance inputs/outputs and latch-up immunity >100 mA ensure robust operation in hot-swap and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - supports dual-supply system integration and voltage translation without level shifters |
| tPD Max | 4.5 ns at VCC = 3.3 V - enables reliable timing in high-speed address/data buses up to ~220 MHz |
| IOH/IOL | ±24 mA at VCC = 3.0 V - drives heavy capacitive loads (e.g., >10 pF per line) and multiple TTL inputs |
| Input/Output Tolerance | 5 V tolerant - permits safe connection to 5 V signals while powered from 2.5 V or 3.3 V supplies |
| ICCQ Max | 10 µA - reduces static power in battery-backed or always-on subsystems |
| ESD HBM | >2000 V - enhances handling robustness and field reliability in assembly and end-use |
| CIN/COUT | 7 pF / 8 pF - limits signal distortion and crosstalk in high-density routing |
Pinout & Package
TSSOP-48 package (Case 948BQ), 12.5 mm × 6.1 mm footprint, 0.5 mm pitch, lead-free and halide-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1 | Output Enable Input (nibble 0) | Active-low control for outputs O0–O3; enables independent 4-bit bus gating |
| OE2 | Output Enable Input (nibble 1) | Active-low control for outputs O4–O7; supports partial bus isolation |
| OE3 | Output Enable Input (nibble 2) | Active-low control for outputs O8–O11; facilitates modular bus expansion |
| OE4 | Output Enable Input (nibble 3) | Active-low control for outputs O12–O15; allows full 16-bit or segmented operation |
| I0–I15 | Buffer Inputs | Non-inverting data inputs; 5 V tolerant, low input capacitance (7 pF) |
| O0–O15 | Buffer Outputs | 3-STATE outputs with ±24 mA drive; high-impedance when corresponding OE is HIGH |
| NC | No Connect | Unbonded pins; must remain unconnected per design - no internal function |
| VCC, GND | Power Supply | Single supply rail; decoupling required per high-speed CMOS practice (e.g., 0.1 µF near each VCC) |
Key Features
| Feature | Design Value |
|---|---|
| 5 V tolerant I/O | Enables interoperability between 2.5 V/3.3 V logic and 5 V peripherals without external level translators |
| Nibble-selectable 3-STATE | Four independent OE inputs allow dynamic partitioning of 16-bit buses into four 4-bit segments |
| Live insertion support | High-impedance inputs/outputs during power-up/down prevent bus contention in hot-plug backplane applications |
| Low-noise switching | Patented EMI reduction circuitry suppresses ground bounce and supply rail noise during simultaneous switching |
| Power-down leakage | IOFF ≤ 10 µA at VCC = 0 V ensures minimal current draw in standby or shutdown modes |
Applications
| Memory Address Buffering | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to a 5 V SRAM or Flash memory array. IC Role / Device Role / Timing Role: Non-inverting voltage-tolerant buffer providing timing-critical address propagation with sub-5 ns delay. Use Value: Eliminates need for discrete level shifters while maintaining setup/hold margins across mixed-voltage memory access cycles. |
Use Scenario: Interfacing a 2.5 V FPGA I/O bank to legacy 5 V I/O modules on a programmable logic controller backplane. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling hot-swappable module communication with controlled enable sequencing. Use Value: Supports live insertion via power-down high-Z state and withstands repeated 5 V signal exposure without degradation. |
| High-Density Data Bus Isolation | Automotive Infotainment Baseband Routing |
|
Use Scenario: Segmenting a 16-bit parallel data bus between two ASICs operating at different supply voltages (3.3 V vs. 5 V). IC Role / Device Role / Timing Role: Nibble-gated buffer allowing independent enable/disable of bus segments to reduce dynamic power and crosstalk. Use Value: Reduces switching noise by up to 75% versus full-bus activation, improving signal integrity in dense PCB layouts. |
Use Scenario: Routing audio/video baseband signals from a 3.3 V SoC to legacy 5 V display or amplifier ICs in automotive head units. IC Role / Device Role / Timing Role: Low-skew (≤1.0 ns) buffer preserving signal timing alignment across all 16 lines. Use Value: Maintains inter-channel synchronization critical for multi-lane analog video or parallel digital audio interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16244ADGGR | 3.3 V only VCC range (1.65–3.6 V); no 5 V tolerance - requires external clamping or level shifting for 5 V I/O | Best suited for pure 3.3 V systems where cost and lower ICCQ (1 µA) are prioritized over mixed-voltage flexibility | Select when interfacing exclusively within 3.3 V domains and board space allows added protection circuitry for 5 V signals |
| 74ALVC16244PW | Higher speed (tPD = 3.3 ns @ 3.3 V) but narrower VCC range (2.3–3.6 V); 5 V tolerant only with external series resistors | Preferred for ultra-low-latency 3.3 V bus extensions where timing margin is critical and 5 V compatibility is secondary | Choose when propagation delay < 3.5 ns is mandatory and system-level 5 V signal handling is managed elsewhere |
Compared with SN74LVC16244ADGGR and 74ALVC16244PW, the 74LCX16244GX uniquely combines wide VCC range (1.65–5.5 V), native 5 V I/O tolerance, and nibble-level control - making it the only option that eliminates external level-shifting components while supporting flexible bus segmentation in mixed-voltage embedded systems.
Availability
74LCX16244GX is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, high-density data buses, and automotive infotainment routing requiring stable component supply and long-term lifecycle assurance.
Supply support for 74LCX16244GX 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LCX logic family - including the 74LCX16244GX - was engineered for low-voltage, high-speed bus interfacing in mixed-signal systems where voltage translation, noise immunity, and hot-swap capability are essential design requirements.
FAQ
What is the maximum operating frequency supported by the 74LCX16244GX?
The 74LCX16244GX does not specify a maximum clock frequency directly, but its 4.5 ns maximum propagation delay at 3.3 V VCC implies reliable operation in systems with data rates up to approximately 220 MHz under typical loading conditions. Actual usable frequency depends on PCB layout, load capacitance, and signal integrity margins - design validation is required for timing-critical applications using the 74LCX16244GX.
Can the 74LCX16244GX be used with a 2.5 V supply while interfacing to 5 V devices?
Yes - the 74LCX16244GX is explicitly rated for 5 V tolerant inputs and outputs across its full 1.65 V to 5.5 V VCC range. When powered from 2.5 V, it safely accepts and drives 5 V logic signals without damage or level-shifting circuitry, making the 74LCX16244GX ideal for bridging legacy 5 V peripherals with modern low-voltage controllers.
How should unused inputs and outputs be handled on the 74LCX16244GX?
Unused inputs on the 74LCX16244GX must be tied to a valid logic level - either VCC or GND - to prevent floating states that increase power consumption and noise susceptibility. Unused outputs may be left open, but if connected to a shared bus, they should be disabled via their respective OE inputs to avoid contention. This guidance applies universally across all configurations of the 74LCX16244GX.
Does the 74LCX16244GX support hot-swap or live insertion?
Yes - the 74LCX16244GX supports live insertion and withdrawal per its datasheet, enabled by power-down high-impedance inputs and outputs. To ensure safe operation during power-up/power-down, OE pins should be tied to VCC through a pull-up resistor (value determined by driver capability), placing all outputs in high-Z state until system initialization completes - a key feature of the 74LCX16244GX in backplane and modular systems.
What is the thermal resistance (θJA) of the 74LCX16244GX in its TSSOP-48 package?
The 74LCX16244GX in TSSOP-48 (Case 948BQ) has a specified junction-to-ambient thermal resistance (θJA) of 71 °C/W, measured on a standard FR4 board with minimum pad spacing, 76 mm × 114 mm copper area, and no airflow per JESD51-7. This value assumes proper PCB thermal design - adding thermal vias and copper pour significantly improves real-world dissipation for the 74LCX16244GX in continuous operation.
74LCX16244GX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 54-LFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 54-FBGA (5.5x8)
74LCX16244GX FAQ
1.How can I place an order for 74LCX16244GX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX16244GX 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 74LCX16244GX reliable?
The price and inventory of 74LCX16244GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX16244GX is usually 5 days.
3.What payment methods are accepted for 74LCX16244GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX16244GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX16244GX?
74LCX16244GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX16244GX 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 74LCX16244GX?
For technical support, including 74LCX16244GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX16244GX requirements.
6.How does Aetrix verify that 74LCX16244GX is sourced from the original manufacturer or authorized distributors?
All 74LCX16244GX 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 74LCX16244GX meets industry standards.
7.What is the process for return or replacement of 74LCX16244GX?
All 74LCX16244GX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX16244GX, 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 74LCX16244GX part is unused and in its original packaging.
Return procedure for 74LCX16244GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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