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onsemi 74LVT244WMX
- Part No.:
- 74LVT244WMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT244WMX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,483
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Product details
Overview
74LVT244WMX from ON Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs, designed for memory address and clock driving in 3.3V systems interfacing to 5V TTL environments. It features 20-pin SOIC packaging, ±32mA/64mA output drive capability, –40°C to +85°C operating temperature, and BiCMOS fabrication enabling high-speed operation with low power dissipation.
For engineers reviewing the 74LVT244WMX datasheet, pinout, applications, or equivalent options, key selection considerations include its 3.3V supply compatibility, dual 3-STATE enable control (OE1/OE2), bus-oriented transceiver functionality, and absence of bushold inputs-distinguishing it from the LVTH variant.
Technical Context
The 74LVT244WMX implements eight non-inverting buffers with independent 3-STATE control via two active-low enable inputs (OE1, OE2), each gating four outputs. Its BiCMOS architecture delivers propagation delays as low as 1.1 ns (tPLH/tPHL) at 3.3V while maintaining TTL-level input thresholds (VIH = 2.0V min, VIL = 0.8V max) for 5V interface compatibility.
It supports live insertion/extraction and provides glitch-free bus loading during power-up/down via high-impedance outputs. DC output drive is asymmetric: –32mA (sourcing) and +64mA (sinking), with latch-up immunity exceeding 500mA and ESD robustness per HBM >2000V, MM >200V, and CDM >1000V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V–3.6V - Ensures stable operation across industrial 3.3V rail tolerances. |
| Input Voltage Range | 0V–5.5V - Enables direct connection to 5V TTL logic without level shifters. |
| Output Drive | –32mA / +64mA - Supports heavy capacitive bus loading and fanout to multiple TTL inputs. |
| Propagation Delay | 1.1–4.2 ns - Meets timing-critical address/clock distribution requirements in high-speed digital systems. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial ambient conditions without derating. |
| Input Clamp Voltage | –1.2V - Protects against negative transients on data or control lines. |
| 3-STATE Leakage | ±5 µA - Minimizes bus contention current when outputs are disabled. |
Pinout & Package
74LVT244WMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide package (M20B), with standard 1.27 mm pitch and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enables - Independently disable upper/lower quad of outputs to manage bus arbitration. |
| 2–9, 11–18 | I0–I7, O0–O7 | Data inputs and buffered outputs - Non-inverting path with TTL-compatible thresholds and high-current drive. |
| 10 | GND | Ground reference - Dedicated ground pin per package side improves noise immunity and current return path integrity. |
| 20 | VCC | 3.3V supply - Single positive supply; no separate logic or I/O voltage rails required. |
Key Features
| Feature | Design Value |
|---|---|
| 3.3V operation with 5V-tolerant inputs | Enables seamless integration into mixed-voltage systems without external level translation circuitry. |
| Dual independent 3-STATE enables | Allows selective disabling of output groups (O0–O3 vs. O4–O7) for flexible bus segmentation and reduced switching noise. |
| High sink/source current capability | Supports driving up to 10 standard TTL loads or long PCB traces with minimal signal degradation. |
| Live insertion/extraction support | Permits hot-swap capability in backplane or modular system designs without damaging the device or host board. |
| Power-up/down high-impedance state | Prevents bus contention during power sequencing, eliminating need for external reset coordination logic. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting voltage-level translating buffer with 3-STATE control for bus isolation. Use Value: Eliminates need for discrete level shifters while ensuring clean, high-fanout address signals with sub-5 ns propagation delay. | Use Scenario: Distributing a 3.3V system clock to multiple 5V peripheral ICs requiring synchronous timing. IC Role / Device Role / Timing Role: Low-skew clock driver with TTL-compatible output swing and fast edge rates. Use Value: Maintains signal integrity across distributed clock nets with <1.0 ns output-to-output skew and 64mA sink capability. |
| Bus Transceiver Interface | Legacy System Interfacing |
Use Scenario: Bidirectional data bus isolation between a 3.3V FPGA and legacy 5V ASIC subsystem. IC Role / Device Role / Timing Role: Unidirectional line driver used in pairs for controlled data flow direction with OE-gated enable. Use Value: Provides galvanic separation of voltage domains while supporting hot-plug-capable bus arbitration via independent OE control. | Use Scenario: Upgrading aging 5V industrial controller boards with modern 3.3V processors while retaining existing 5V peripherals. IC Role / Device Role / Timing Role: Logic-level translator and bus driver bridging voltage domain mismatch. Use Value: Enables drop-in replacement of obsolete 74-series drivers without redesigning PCB layout or adding external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH244WMX | Includes bushold inputs; eliminates need for external pull-ups on unused inputs. | Better suited for systems with floating or undriven inputs; higher input leakage current (±75 µA) vs. 74LVT244WMX (±1 µA). | Select when input stability without external resistors is critical; not pin/functionally identical due to internal bushold circuitry. |
| SN74LVC244APWR | CMOS-based; lower ICCZ (0.1 µA vs. 0.19 mA), wider VCC range (1.65–3.6V), but lower output drive (±24mA). | Preferred for ultra-low-power battery-operated systems; less suitable for driving heavy TTL loads or long traces. | Choose for energy-constrained designs where 24mA drive suffices; verify timing margins as tPD is ~5.5 ns at 3.3V. |
Compared with 74LVTH244WMX and SN74LVC244APWR, the 74LVT244WMX offers superior current drive and proven 5V interface robustness, making it optimal for industrial bus buffering where reliability under load and legacy compatibility outweigh ultra-low quiescent current needs.
Availability
74LVT244WMX is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus transceiver interfacing requiring stable component supply and long-term industrial availability.
Supply support for 74LVT244WMX 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 is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure applications.
The 74LVT244WMX belongs to ON Semiconductor's legacy logic portfolio inherited from Fairchild, engineered specifically for high-density, mixed-voltage digital system interconnect in industrial and computing equipment.
FAQ
What is the recommended operating voltage range for the 74LVT244WMX?
The 74LVT244WMX is specified for a supply voltage range of 2.7V to 3.6V. Operation outside this range may result in undefined behavior or reduced reliability. The device is optimized for 3.3V nominal systems but maintains full 5V input tolerance, allowing interoperability with legacy TTL logic without level-shifting circuitry. Always validate performance across the full temperature range (–40°C to +85°C) for your specific application.
Does the 74LVT244WMX have bushold inputs?
No, the 74LVT244WMX does not include bushold circuitry. This distinguishes it from the 74LVTH244WMX variant, which integrates bushold to retain input state without external pull-up resistors. The 74LVT244WMX requires externally terminated unused inputs to prevent floating nodes, typically using pull-up or pull-down resistors as dictated by system logic design rules.
What is the maximum output current capability of the 74LVT244WMX?
The 74LVT244WMX delivers –32mA (source) and +64mA (sink) per output under recommended operating conditions. These values ensure reliable driving of multiple TTL loads or capacitive transmission lines. Exceeding these limits risks thermal overstress or parametric shift; simultaneous switching of all eight outputs must be evaluated against total ICC and thermal derating curves in the datasheet.
Can the 74LVT244WMX be used in hot-swap applications?
Yes, the 74LVT244WMX supports live insertion and extraction, making it suitable for hot-swap backplane or modular system designs. Its power-up/power-down high-impedance feature prevents bus contention during insertion, and its robust ESD protection (HBM >2000V) enhances resilience to handling-induced transients. Ensure proper mechanical and electrical sequencing per system-level hot-swap specifications.
Is the 74LVT244WMX still recommended for new designs?
No-the 74LVT244WMX is marked as discontinued and not recommended for new designs by ON Semiconductor. While available through Aetrix Electronics for legacy system support and repair, designers should consult ON Semiconductor for approved replacements such as LVC or newer logic families. Lifecycle documentation and last-time-buy guidance for 74LVT244WMX can be obtained directly from ON Semiconductor representatives.
74LVT244WMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LVT244WMX FAQ
1.How can I place an order for 74LVT244WMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT244WMX 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 74LVT244WMX reliable?
The price and inventory of 74LVT244WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244WMX is usually 5 days.
3.What payment methods are accepted for 74LVT244WMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244WMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT244WMX?
74LVT244WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT244WMX 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 74LVT244WMX?
For technical support, including 74LVT244WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244WMX requirements.
6.How does Aetrix verify that 74LVT244WMX is sourced from the original manufacturer or authorized distributors?
All 74LVT244WMX 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 74LVT244WMX meets industry standards.
7.What is the process for return or replacement of 74LVT244WMX?
All 74LVT244WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244WMX, 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 74LVT244WMX part is unused and in its original packaging.
Return procedure for 74LVT244WMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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