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onsemi 74LVT244WM
- Part No.:
- 74LVT244WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT244WM.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,784
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Product details
Overview
74LVT244WM 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 buses. It features ±32mA/±64mA output drive, 20-pin SOIC (JEDEC MS-013) package, and operates across –40°C to +85°C. Its BiCMOS process enables ABT-class speed with low power dissipation.
For engineers reviewing the 74LVT244WM datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, confirmed DC/AC electrical specs, validated SOIC-20 pin mapping, real-world bus interface use cases, and two technically documented alternative parts for legacy system support and obsolescence mitigation.
Technical Context
The 74LVT244WM implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1, OE2), supporting high-density bus transceivers and clock distribution. Each output drives up to –32mA (HIGH) or +64mA (LOW) into 500Ω loads at 3.3V VCC while maintaining TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max).
Its BiCMOS architecture delivers propagation delays as low as 1.1ns (tPLH/tPHL, CL = 50pF) and output skew ≤1.0ns, enabling synchronous multi-line signaling in memory and peripheral interfaces. Power-up/down high-impedance behavior prevents bus glitches during hot insertion or supply sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 2.7V–3.6V - Ensures stable operation in 3.3V ±10% industrial power rails. |
| IOH / IOL Drive | –32mA / +64mA - Supports direct connection to 500Ω TTL loads without external buffering. |
| tPLH / tPHL Delay | 1.1ns–3.9ns (CL = 50pF) - Enables sub-5ns timing margins in high-speed address/data buses. |
| VIH / VIL Thresholds | 2.0V min / 0.8V max - Guarantees reliable logic-level translation between 3.3V LVT and 5V TTL systems. |
| ICCZ Quiescent Current | 0.19mA (outputs disabled) - Minimizes standby power in battery-backed or low-power hold modes. |
| CIN / COUT Capacitance | 3pF / 6pF - Reduces signal integrity degradation and crosstalk in dense PCB layouts. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
74LVT244WM uses a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with 1.27mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard counter-clockwise sequence from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enable inputs - Independently disable upper/lower 4-bit output groups to prevent bus contention. |
| 2–5, 11–14 | I0–I3, I4–I7 | Data inputs - Accept 3.3V CMOS/LVT logic levels; tolerate 5.5V inputs without damage. |
| 3, 5, 7, 9, 12, 14, 16, 18 | O0–O7 | Buffered outputs - Provide rail-to-rail swing with ±32mA/±64mA drive capability and fast edge rates. |
| 10, 20 | GND, VCC | Power terminals - Dual ground and supply pins reduce switching noise and improve PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| 3.3V VCC with 5V-tolerant I/O | Enables seamless integration into mixed-voltage systems without level shifters. |
| Independent dual 3-STATE enables | Allows selective gating of two 4-bit data lanes-critical for multiplexed address/data buses. |
| Power-up/down high-impedance | Prevents bus conflicts during power sequencing or hot-swap events in backplane applications. |
| BiCMOS high-speed/low-power design | Delivers ABT-equivalent speed (sub-4ns delay) while consuming <5mA ICC under load. |
| Latch-up immunity >500mA | Meets JEDEC JESD78 Class II requirements-ensures robustness in noisy industrial environments. |
Applications
| Memory Address Driver | Clock Distribution Hub |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control isolates MCU outputs during bus arbitration and provides current gain for fanout. Use Value: Eliminates need for discrete pull-ups or level translators while maintaining <4ns propagation delay across all 8 outputs. |
Use Scenario: Distributing a 25MHz system clock from a 3.3V oscillator to four 5V peripheral controllers. IC Role / Device Role / Timing Role: Low-skew (<1ns) line driver ensuring simultaneous clock edge arrival across multiple receivers. Use Value: Sustains signal integrity with 6pF output capacitance and ±64mA drive into capacitive loads up to 50pF. |
| PCI Bus Transceiver Interface | Legacy ISA Slot Expansion |
|
Use Scenario: Interfacing a modern 3.3V FPGA I/O bank to a 5V PCI slot's AD[31:0] bus during partial reconfiguration. IC Role / Device Role / Timing Role: Bidirectional buffer controlled by OE signals synchronized to PCI FRAME# and IRDY# handshake. Use Value: Withstands 5.5V input overvoltage and delivers glitch-free 3-STATE transitions during hot-plug cycles. |
Use Scenario: Adding 3.3V logic compatibility to an industrial PC motherboard supporting ISA expansion cards with 5V I/O. IC Role / Device Role / Timing Role: Level-translating buffer for ISA address latch (A0–A19) and control lines (IOR#, IOW#). Use Value: Provides TTL-compatible VIH/VIL thresholds and 64mA sink current to drive legacy ISA bus loads reliably. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH244WM | Includes bushold inputs (75µA minimum hold current); identical pinout, timing, and drive strength. | Eliminates external pull-ups on unused inputs-reduces BOM count and board space in sparse-bus designs. | Select when input floating states must be actively held without external components. |
| SN74LVC244APWR | CMOS-only process; lower ICCZ (10µA vs 0.19mA) but reduced IOL (24mA vs 64mA); same SOIC-20 footprint. | Better for ultra-low-power standby but unsuitable for heavy 500Ω TTL loads requiring >32mA sink. | Select only if system load impedance exceeds 1kΩ and quiescent current is critical. |
Compared with 74LVT244WM, 74LVTH244WM adds bushold functionality without trade-offs in speed or drive, while SN74LVC244APWR trades output strength for lower static power-making it viable only in light-load, low-quiescent scenarios where 74LVT244WM's 64mA sink is unnecessary.
Availability
74LVT244WM is available at Aetrix Electronics and suitable for industrial control panels, legacy computer backplanes, and 5V/3.3V mixed-voltage memory subsystems requiring stable component supply and long-term obsolescence management.
Supply support for 74LVT244WM 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 energy-efficient power management, analog, and logic solutions for automotive, industrial, and computing markets.
The 74LVT244WM belongs to ON Semiconductor's legacy logic portfolio inherited from Fairchild, engineered specifically for high-density, mixed-voltage bus interfacing in industrial and computing infrastructure.
FAQ
What is the recommended operating voltage range for the 74LVT244WM?
The 74LVT244WM is specified for 2.7V to 3.6V VCC operation. Operation outside this range may cause timing violations or increased ICC. The device tolerates 5.5V on inputs (VI) and outputs (VO) in 3-STATE, but sustained VCC beyond 3.6V risks parametric failure per Absolute Maximum Ratings.
Does the 74LVT244WM support hot insertion or live extraction?
Yes, the 74LVT244WM supports live insertion/extraction due to its power-up/down high-impedance feature. During VCC ramp-up or ramp-down, outputs remain in high-impedance state, preventing bus contention or back-driving-critical for modular backplane and card-edge applications.
What is the maximum output current the 74LVT244WM can sink or source?
The 74LVT244WM can sink up to +64mA per output (IOL) at VOL ≤ 0.55V and source up to –32mA (IOH) at VOH ≥ 2.0V, both tested at VCC = 3.0V and TA = –40°C to +85°C. These values ensure robust drive into standard 500Ω TTL loads.
Is the 74LVT244WM pin-compatible with standard 74-series 244 devices?
Yes, the 74LVT244WM is functionally compatible with the 74 series 244 and shares identical pinout and logic behavior. However, it operates at 3.3V VCC (not 5V) and offers enhanced drive strength and 5V-tolerant I/O-requiring careful attention to supply voltage and load conditions.
Why is the 74LVT244WM marked as "Not Recommended for New Design"?
The 74LVT244WM is discontinued per ON Semiconductor's product lifecycle policy. It remains available for legacy system repair and continuity, but new designs should consider alternatives like 74LVTH244WM (with bushold) or newer LVC-family buffers with improved power efficiency and extended support.
74LVT244WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 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
74LVT244WM FAQ
1.How can I place an order for 74LVT244WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT244WM 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 74LVT244WM reliable?
The price and inventory of 74LVT244WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244WM is usually 5 days.
3.What payment methods are accepted for 74LVT244WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT244WM?
74LVT244WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT244WM 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 74LVT244WM?
For technical support, including 74LVT244WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244WM requirements.
6.How does Aetrix verify that 74LVT244WM is sourced from the original manufacturer or authorized distributors?
All 74LVT244WM 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 74LVT244WM meets industry standards.
7.What is the process for return or replacement of 74LVT244WM?
All 74LVT244WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244WM, 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 74LVT244WM part is unused and in its original packaging.
Return procedure for 74LVT244WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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