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onsemi 74LCX244SJX
- Part No.:
- 74LCX244SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LCX244SJX.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,894
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Product details
Overview
74LCX244SJX from ON Semiconductor (formerly Fairchild) is an octal non-inverting 3-STATE buffer/line driver designed for low-voltage bus interfacing in 2.3V–3.6V systems with 5V-tolerant I/O. It delivers 6.5ns max propagation delay at VCC = 3.3V, ±24mA output drive at 3.0V, and supports live insertion via power-down high-impedance I/O. It is commonly used in memory address buffering and 3.3V-to-5V bus translation.
For engineers reviewing the 74LCX244SJX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant I/O compatibility, 20-pin SOP package dimensions, 3-STATE enable timing (tPZL/tPLZ ≤ 7.0ns), and quiescent ICC ≤ 10µA under static conditions.
Technical Context
The 74LCX244SJX implements two independent 4-bit groups (OE1 controls I0–I3/O0–O3; OE2 controls I4–I7/O4–O7), each with separate 3-STATE enable inputs. Its advanced CMOS process enables rail-to-rail 5V-tolerant input thresholds while maintaining sub-7ns propagation delay and low dynamic power dissipation.
It features true power-down protection: inputs and outputs enter high-impedance state when VCC = 0V, and supports hot-plug operation when OE is pulled up to VCC. ESD robustness exceeds 2000V HBM and 200V MM, with latch-up immunity >500mA per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables direct use in 2.5V and 3.3V logic domains without level shifters. |
| Input/Output Voltage Tolerance | –0.5V to +7.0V - Allows safe connection to 5V buses without external clamping diodes. |
| tPD Max | 6.5ns at VCC = 3.3V, CL = 50pF - Supports high-speed data transfer on local buses up to ~150MHz. |
| IOL/IOH | ±24mA at VCC = 3.0V - Drives multiple LVTTL or standard TTL loads without fanout limitation. |
| ICC Quiescent | 10µA max at VCC = 3.6V - Minimizes standby power in battery-backed or energy-sensitive systems. |
| 3-STATE Enable Time | tPZL/tPZH ≤ 8.0ns - Ensures fast bus arbitration and avoids contention during multi-driver sharing. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
74LCX244SJX is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (package code M20D). The body dimensions are 12.8mm × 7.6mm × 2.4mm (L × W × H), with 1.27mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs I0–I7 | Non-inverting data inputs; accept 0–5.5V logic levels regardless of VCC. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Outputs O0–O7 | 3-STATE buffered outputs; driven HIGH/LOW or tri-stated based on OE1/OE2. |
| 18, 16 | OE1 | Active-Low enable for outputs O0–O3; tied HIGH via pull-up for default disable during power-up. |
| 3, 5, 7, 9 | OE2 | Active-Low enable for outputs O4–O7; independent control allows split-bus gating. |
| 10, 20 | VCC | Primary supply pin; must be decoupled locally with 0.1µF ceramic capacitor. |
| 19, 11 | GND | Ground reference; dual pins reduce ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O architecture | Enables direct interface between 3.3V logic and legacy 5V peripherals without external voltage translators. |
| Live insertion support | Guaranteed high-impedance I/O during VCC ramp-up/down prevents bus contention in hot-swap backplanes. |
| Low dynamic power dissipation | CPD = 25pF at 3.3V enables efficient operation in high-frequency clock distribution with minimal heat generation. |
| High noise immunity | Implements proprietary EMI reduction circuitry and 0.7V/2.0V VIH/VIL thresholds for stable operation in noisy industrial environments. |
| Latch-up immunity | Exceeds 500mA per JEDEC JESD78 - eliminates risk of destructive latch-up during transient overvoltage events. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a 3.3V microcontroller to a 5V SRAM or EPROM in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control isolates address bus during memory read/write cycles and enables shared bus access. Use Value: Eliminates need for discrete level-shifting components while maintaining <7ns propagation delay for cycle-accurate timing alignment. | Use Scenario: Interfacing a 3.3V FPGA I/O bank to a 5V RS-485 transceiver or CAN controller in factory automation nodes. IC Role / Device Role / Timing Role: Voltage-tolerant line driver translates control signals (DE, RE, TXEN) with rail-compatible logic thresholds. Use Value: Prevents signal corruption due to VCC mismatch and ensures reliable enable/disable sequencing across mixed-voltage subsystems. |
| Hot-Swappable Module Backplane | Low-Power Embedded Data Acquisition |
Use Scenario: Providing isolated 3-STATE bus drivers on modular I/O cards inserted into powered-backplane systems. IC Role / Device Role / Timing Role: Live-insertion-capable buffer ensures no bus contention during card insertion/removal by entering high-Z before VCC stabilizes. Use Value: Meets IEC 61000-4-2 ESD and JEDEC JESD78 latch-up requirements for field-replaceable modules. | Use Scenario: Buffering sensor ADC output lines and microcontroller SPI signals in portable environmental monitors. IC Role / Device Role / Timing Role: Low-quiescent-current (10µA) buffer maintains signal integrity while minimizing system sleep-mode power draw. Use Value: Extends battery life in always-on monitoring devices without sacrificing 3.3V/5V interoperability. |
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 |
|---|---|---|---|
| 74LVC244APW,118 | Lower VCC min (1.65V), higher speed (tPD = 4.2ns @ 3.3V), but only 3.6V I/O tolerance - not 5V tolerant. | Requires external clamping or level shifters for 5V bus connections; unsuitable for direct 5V interface. | Select only if system operates strictly within 1.65–3.6V and all connected peripherals are 3.3V or lower. |
| SN74LVCH244AQPWRQ1 | Automotive-qualified (AEC-Q100 Grade 2), same 5V I/O tolerance, but tPD = 7.1ns and ICC = 20µA - slightly slower and higher static current. | Validated for automotive temperature range (–40°C to +105°C) and enhanced reliability testing. | Choose for automotive infotainment or ADAS subsystems where qualification and extended temperature margin are mandatory. |
Compared with 74LCX244SJX, the 74LVC244APW offers faster speed but lacks 5V tolerance, requiring redesign for mixed-voltage buses; the SN74LVCH244AQPWRQ1 adds automotive qualification at the cost of marginal timing and power penalties - making 74LCX244SJX optimal for industrial 3.3V/5V bridging where cost, proven reliability, and native 5V tolerance are prioritized.
Availability
74LCX244SJX is available at Aetrix Electronics and suitable for industrial bus interface, memory address buffering, and hot-swappable module backplane applications requiring stable component supply and long-term lifecycle continuity.
Supply support for 74LCX244SJX 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in intelligent power and sensing technologies, delivering energy-efficient semiconductor solutions for automotive, industrial, cloud computing, and IoT applications.
The 74LCX family was developed specifically for low-voltage, high-speed logic interfacing with mixed-voltage system architectures - emphasizing 5V-tolerant I/O, live-insertion capability, and industrial-grade robustness.
FAQ
What is the maximum operating voltage on the inputs and outputs of the 74LCX244SJX?
The 74LCX244SJX supports DC input and output voltages from –0.5V to +7.0V, enabling full 5V signal compatibility even when VCC is as low as 2.3V. This specification is verified per Absolute Maximum Ratings and confirmed in the Recommended Operating Conditions table for VI and VO parameters. The 74LCX244SJX achieves this through internal clamp structures that safely shunt excess voltage without damage or functional disruption.
Does the 74LCX244SJX require external pull-up resistors on its OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, OE1 and OE2 must be tied to VCC via external pull-up resistors. The minimum resistor value depends on the driving source's current-sourcing capability; typical values range from 4.7kΩ to 10kΩ. This requirement is explicitly stated in the datasheet note for live insertion support and applies directly to the 74LCX244SJX in SOP packaging.
What package type does the 74LCX244SJX use, and are there footprint-compatible alternatives?
The 74LCX244SJX uses a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (M20D). Its 1.27mm lead pitch and 12.8mm × 7.6mm body match JEDEC MO-150-compliant footprints. While 74LCX244WM (SOIC) and 74LCX244MTC (TSSOP) share identical pinouts, their land patterns differ - only the SOP variant (e.g., 74LCX244SJ, 74LCX244SJX) shares the exact mechanical and soldering profile required for drop-in replacement.
Can the 74LCX244SJX drive standard TTL loads?
Yes - the 74LCX244SJX delivers ±24mA output drive at VCC = 3.0V, exceeding the ±20mA sink/source requirement of standard TTL (74LS) inputs. Its VOL ≤ 0.55V at IOL = 24mA and VOH ≥ 2.2V at IOH = –24mA meet TTL voltage thresholds across the full industrial temperature range. This capability is validated in the DC Electrical Characteristics table for the 74LCX244SJX under VCC = 3.0V conditions.
Is the 74LCX244SJX lead-free and RoHS compliant?
Yes - the 74LCX244SJX is lead-free per JEDEC J-STD-020B and RoHS compliant. All packages, including the SOP variant, meet Pb-free reflow profiles and are marked with appropriate environmental compliance identifiers. This is confirmed in the Ordering Information section of the official datasheet, which states "All packages are lead free per JEDEC: J-STD-020B standard" for the 74LCX244SJX ordering number.
74LCX244SJX 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74LCX244SJX FAQ
1.How can I place an order for 74LCX244SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX244SJX 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 74LCX244SJX reliable?
The price and inventory of 74LCX244SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX244SJX is usually 5 days.
3.What payment methods are accepted for 74LCX244SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX244SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX244SJX?
74LCX244SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX244SJX 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 74LCX244SJX?
For technical support, including 74LCX244SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX244SJX requirements.
6.How does Aetrix verify that 74LCX244SJX is sourced from the original manufacturer or authorized distributors?
All 74LCX244SJX 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 74LCX244SJX meets industry standards.
7.What is the process for return or replacement of 74LCX244SJX?
All 74LCX244SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX244SJX, 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 74LCX244SJX part is unused and in its original packaging.
Return procedure for 74LCX244SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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