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onsemi 74LVTH2244WM
- Part No.:
- 74LVTH2244WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVTH2244WM.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,363
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Product details
Overview
74LVTH2244WM from ON Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs and integrated 25Ω series output resistors, designed for memory address and clock distribution in 3.3V systems interfacing to 5V TTL buses. It features bushold inputs eliminating external pull-ups, ±12mA drive strength, and operates from 2.7V to 3.6V over –40°C to +85°C.
For engineers reviewing the 74LVTH2244WM datasheet, pinout, applications, or equivalent options, key selection criteria include bushold input support, 25Ω output series termination, 3-STATE bus isolation timing (tPZH ≤ 7.7ns), and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74LVTH2244WM implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1/OE2), each gating four outputs (O0–O3 and O4–O7). Its bushold circuitry actively maintains input logic state when floating, enabling robust operation with unused data lines.
Each output integrates a 25Ω series resistor to dampen signal reflections on transmission lines, reducing overshoot/undershoot without requiring external termination. The device uses advanced BiCMOS technology to achieve ABT-class speed (tPLH/tPHL ≤ 5.3ns) while maintaining low ICCZ = 0.19mA in 3-STATE mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 3.6V - Ensures stable operation in 3.3V systems with ±0.3V tolerance margin. |
| Output Drive | ±12mA - Supports direct interface to 5V TTL loads without level-shifting circuitry. |
| Propagation Delay | tPLH/tPHL ≤ 5.3ns at VCC = 2.7V - Enables high-speed address/data buffering in memory subsystems. |
| 3-STATE Enable Time | tPZH ≤ 7.7ns - Minimizes bus contention during dynamic enable/disable transitions. |
| Bushold Input Current | ±75µA at VI = 0.8V/2.0V - Actively holds floating inputs at valid logic levels, removing need for external pull-ups. |
| Output Series Resistance | 25Ω - Integrated termination reduces EMI and signal integrity issues on PCB traces up to ~10cm. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and computing applications. |
Pinout & Package
74LVTH2244WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with standard 1.27mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15 | I0–I7 (Data Inputs) | Non-inverting input terminals with bushold; maintain last valid logic state when unconnected. |
| 3, 5, 7, 9, 12, 14, 16, 18 | O0–O7 (3-STATE Outputs) | Buffered outputs with integrated 25Ω series resistance; enter high-impedance state when OE is HIGH. |
| 19, 20 | OE1, OE2 (Output Enables) | Active-LOW enables for two independent 4-bit output groups; supports partial bus control. |
| 10 | GND | Ground reference for all internal circuitry and I/O structures. |
| 20 | VCC | Primary 3.3V supply rail; powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold inputs | Eliminates external pull-up resistors on unused data lines, reducing BOM count and board space in memory expansion designs. |
| 25Ω output series resistors | Provides built-in source termination for controlled-impedance trace routing, lowering signal integrity validation effort. |
| Live insertion/extraction support | Enables hot-swap capability in modular backplane systems without damaging connected logic. |
| Power-up/down high-impedance | Prevents bus contention during power sequencing by holding outputs in 3-STATE until VCC stabilizes. |
| TTL-compatible I/O | Accepts 5V-tolerant inputs and drives 5V TTL loads directly, simplifying mixed-voltage system interconnect. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout amplification with precise timing control. Use Value: Bushold inputs prevent floating address bits during reset; 25Ω output resistors suppress ringing on 10–15cm PCB traces. |
Use Scenario: Distributing a system clock from a 3.3V oscillator to multiple 5V peripheral ICs with matched skew. IC Role / Device Role / Timing Role: Low-skew (<1.0ns) line driver ensuring synchronous timing across clock-receiving devices. Use Value: tOSHL/tOSLH ≤ 1.0ns guarantees minimal clock phase deviation between outputs, critical for setup/hold compliance. |
| PCI Bus Interface | Industrial Control Backplane |
|
Use Scenario: Isolating and driving PCI address/data signals between 3.3V host controller and legacy 5V add-in cards. IC Role / Device Role / Timing Role: 3-STATE octal buffer enabling bidirectional bus control with fast enable/disable response. Use Value: tPZH ≤ 7.7ns and tPHZ ≤ 6.8ns meet PCI timing requirements for bus turnaround latency. |
Use Scenario: Interfacing programmable logic outputs to 5V-rated I/O modules in factory automation PLC racks. IC Role / Device Role / Timing Role: Robust line driver with latch-up immunity (>500mA) and ESD protection (>2000V HBM). Use Value: Industrial temperature range (–40°C to +85°C) and high ESD tolerance ensure reliability in electrically noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | No bushold; 3.3V-only I/O; no integrated 25Ω resistors; lower drive (±24mA). | Requires external pull-ups for unused inputs; needs external series termination for signal integrity. | Select when cost sensitivity outweighs bushold convenience and board-level termination is acceptable. |
| 74ALVC244MTCX | No bushold; higher speed (tPD ≤ 3.3ns); 3.3V-only I/O; no integrated 25Ω resistors. | Not 5V-tolerant; unsuitable for mixed-voltage bus interfaces without level shifters. | Choose for pure 3.3V systems demanding maximum speed and lowest propagation delay. |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LVTH2244WM uniquely combines bushold inputs, 5V-tolerant I/O, and integrated 25Ω output resistors-making it optimal for legacy bus upgrades and noise-sensitive 3.3V-to-5V bridging where layout simplicity and signal integrity are prioritized over raw speed.
Availability
74LVTH2244WM is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, and industrial backplane interfaces requiring stable component supply, long-term lifecycle support, and consistent SOIC-20 packaging.
Supply support for 74LVTH2244WM 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 supplier of energy-efficient semiconductor components for automotive, industrial, cloud computing, and consumer electronics applications.
The 74LVTH2244WM belongs to ON Semiconductor's LVT/LVTH logic family, engineered specifically for high-density, mixed-voltage digital systems requiring robust bus interfacing with minimized external components.
FAQ
What is the function of the bushold feature in the 74LVTH2244WM?
The bushold feature in the 74LVTH2244WM actively maintains the last valid logic state on each input (I0–I7) when left unconnected, eliminating the need for external pull-up or pull-down resistors. This reduces component count and improves reliability in systems with partially populated address or control buses, and is confirmed in the DC Electrical Characteristics table for VI = 0.8V/2.0V with II(HOLD) = ±75µA.
Does the 74LVTH2244WM support 5V logic inputs while operating at 3.3V VCC?
Yes, the 74LVTH2244WM supports 5V-tolerant inputs with VI up to 5.5V while powered at VCC = 2.7V–3.6V, as specified in the Recommended Operating Conditions table. This allows direct connection to 5V TTL outputs without level-shifting circuitry, a key design advantage for mixed-voltage bus interfacing.
What is the purpose of the 25Ω series resistors on the 74LVTH2244WM outputs?
The 25Ω series resistors integrated into each output (O0–O7) of the 74LVTH2244WM provide source termination to reduce signal reflections, overshoot, and undershoot on PCB traces. This improves signal integrity without requiring discrete resistors, particularly beneficial for trace lengths up to 10–15cm in memory and clock distribution applications.
How does the 74LVTH2244WM handle power-up and power-down sequencing?
The 74LVTH2244WM features power-up/down high-impedance behavior: outputs remain in 3-STATE during VCC ramp-up and ramp-down, preventing bus contention and glitches. This is verified in the General Description and supported by IPU/PD leakage current ≤ ±100µA under 0–1.5V conditions.
What package type is used for the 74LVTH2244WM and is it RoHS-compliant?
The 74LVTH2244WM uses a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, M20B), and is lead-free per JEDEC J-STD-020B, as confirmed in the Ordering Information section. The package drawing (Figure 1) specifies land pattern SOIC127P1030X265-20L and conforms to industrial reflow profiles.
74LVTH2244WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LVTH2244WM FAQ
1.How can I place an order for 74LVTH2244WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH2244WM 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 74LVTH2244WM reliable?
The price and inventory of 74LVTH2244WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH2244WM is usually 5 days.
3.What payment methods are accepted for 74LVTH2244WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH2244WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH2244WM?
74LVTH2244WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH2244WM 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 74LVTH2244WM?
For technical support, including 74LVTH2244WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH2244WM requirements.
6.How does Aetrix verify that 74LVTH2244WM is sourced from the original manufacturer or authorized distributors?
All 74LVTH2244WM 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 74LVTH2244WM meets industry standards.
7.What is the process for return or replacement of 74LVTH2244WM?
All 74LVTH2244WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH2244WM, 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 74LVTH2244WM part is unused and in its original packaging.
Return procedure for 74LVTH2244WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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