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Texas Instruments SN74LV244ATPW
- Part No.:
- SN74LV244ATPW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV244ATPW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
SN74LV244ATPW from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory-address, clock, and bus-oriented applications. It operates from 4.5 V to 5.5 V, features TTL-compatible inputs, Ioff partial-power-down support, typical propagation delay of 5.4 ns at 5 V, and low output ground bounce (<0.8 V).
For engineers reviewing the SN74LV244ATPW datasheet, SN74LV244ATPW pinout, SN74LV244ATPW application, or SN74LV244ATPW equivalent, key selection criteria include 3-state bus driving capability, mixed-mode voltage operation support, Ioff-enabled power sequencing, and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
The SN74LV244ATPW implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its logic function follows positive-enable 3-state behavior: OE low enables data flow from A inputs to Y outputs; OE high places outputs in high-impedance state.
It supports mixed-mode voltage operation across all ports, includes Ioff circuitry to disable outputs during power-down and prevent backflow current, and meets JESD 17 latch-up performance (>250 mA). Input thresholds are TTL-compatible (VIH = 2 V, VIL = 0.8 V at VCC = 4.5–5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic systems and tolerance to supply ripple. |
| Propagation Delay (tpd) | 5.4 ns typical at VCC = 5 V, CL = 15 pF - Enables high-speed bus buffering in timing-critical interfaces. |
| Ioff Current | <5 µA at VI/VO = 0–5.5 V - Guarantees isolation during partial power-down, preventing damage from backflow current. |
| Output Drive | ±16 mA at VCC = 4.5–5.5 V - Sufficient to drive multiple TTL loads or moderate-capacitance buses. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Allows direct interfacing with legacy 5-V TTL logic without level-shifting. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements for board-level handling and operation. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial ambient conditions without derating. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed thermal pad not present (standard TSSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control per 4-bit section; must be pulled high via resistor during power-up to ensure high-Z default state. |
| 1A1–1A4, 2A1–2A4 | Noninverting input | Eight buffered inputs grouped into two 4-bit banks; accept TTL-compatible logic levels. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting output | Eight outputs with high-impedance state when respective OE is high; capable of ±16 mA drive. |
| VCC (Pin 10) | Positive supply | Single 4.5–5.5 V rail powers both logic and output stages; decoupling near pin required. |
| GND (Pin 20) | Ground reference | Common return path for all inputs, outputs, and internal circuitry; low-inductance connection critical for noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff partial-power-down protection | Disables outputs automatically when VCC = 0 V, eliminating backflow current risk during hot-insertion or staggered power sequencing. |
| TTL-compatible input thresholds | VIH = 2 V and VIL = 0.8 V at 5 V allow seamless integration with legacy 5-V TTL and CMOS logic families. |
| Low dynamic ground bounce (VOLP) | <0.8 V at VCC = 5 V ensures signal integrity on shared ground planes under fast switching conditions. |
| High noise immunity | VIH/VIL margins of 1.2 V and 0.7 V respectively provide robust operation in electrically noisy industrial environments. |
| 3-state bus contention prevention | Dual independent OE pins enable selective enabling of either 4-bit bank, supporting bidirectional or multiplexed bus architectures. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating address signals and enabling multi-drop addressing without contention. Use Value: Prevents bus conflicts during chip-select transitions and maintains signal integrity over 15-pF trace loads with <5.4 ns delay. | Use Scenario: Distributing a master system clock to multiple peripheral ICs requiring synchronized timing. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer replicating clock signal while supporting hot-swap isolation via OE control. Use Value: Delivers ±16 mA drive into 50-pF loads with tPLH/tPHL ≤ 5.9 ns, minimizing clock skew across endpoints. |
| Industrial Bus Transceiver Interface | Legacy Peripheral Expansion |
Use Scenario: Interfacing a microprocessor's data bus to isolated I/O modules using discrete transceivers. IC Role / Device Role / Timing Role: Direction-controlled driver stage between processor and external bus, enabled only during valid transfer cycles. Use Value: Dual OE pins allow precise timing alignment with control signals; Ioff prevents backfeed during module power cycling. | Use Scenario: Adding parallel port expansion (e.g., printer interface or GPIO bank) to modern controllers lacking native 8-bit I/O. IC Role / Device Role / Timing Role: Level-translating and load-driving interface between 3.3-V MCU and 5-V peripherals. Use Value: TTL-compatible inputs accept 3.3-V logic highs reliably; 5-V VCC supplies sufficient VOH for 5-V receiver thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV244APWR | Same electrical specs and pinout; TSSOP-20 reel (2000 pcs) vs. tube (70 pcs) packaging. | No functional difference; identical use cases including bus buffering and clock distribution. | Select SN74LV244APWR for volume production with automated pick-and-place; SN74LV244ATPW suits prototyping or low-volume builds. |
| SN74LVC244APWR | Wider VCC range (1.65–3.6 V); lower drive (±24 mA); no Ioff; not 5-V tolerant. | Requires level-shifting for 5-V systems; unsuitable for mixed-voltage or partial-power-down designs. | Choose only for pure 3.3-V or dual-supply applications where Ioff and 5-V compatibility are unnecessary. |
Compared with SN74LV244ATPW, SN74LV244APWR offers identical functionality in tape-and-reel form for production scalability, while SN74LVC244APWR trades 5-V operation and Ioff for lower-voltage flexibility-making SN74LV244ATPW the sole choice for industrial 5-V bus systems requiring power sequencing safety.
Availability
SN74LV244ATPW is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, industrial bus interfacing, and legacy peripheral expansion requiring stable component supply and long-term industrial temperature support.
Supply support for SN74LV244ATPW 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and logic solutions, with decades of leadership in industrial-grade logic families.
The SN74LV244AT series was developed to deliver high-speed, robust 3-state buffering for industrial and automotive bus systems requiring reliable power sequencing, noise immunity, and 5-V compatibility.
FAQ
What is the recommended power-up sequence for SN74LV244ATPW to avoid bus contention?
TI specifies that OE pins must be held high (via pullup resistor to VCC) during power-up to guarantee outputs remain in high-impedance state until system initialization completes. For SN74LV244ATPW, a minimum 10-kΩ pullup to VCC on both 1OE and 2OE ensures safe startup; this prevents unintended driving before firmware configures control signals.
Does SN74LV244ATPW support operation at 3.3 V?
No. SN74LV244ATPW is specified only for 4.5 V to 5.5 V VCC operation per its Recommended Operating Conditions table. Attempting 3.3 V operation violates datasheet limits and may result in undefined logic states, excessive ICC, or failure to meet VOL/VOH specifications. Use SN74LVC244A for 3.3-V applications.
Can SN74LV244ATPW drive a 50-pF capacitive load within timing specifications?
Yes. SN74LV244ATPW's switching characteristics explicitly list tPLH/tPHL = 5.9 ns max and tPZH/tPZL = 11.4 ns max at CL = 50 pF and VCC = 5 V. These values confirm full compliance with timing budgets for typical PCB trace and receiver input capacitance in industrial backplane or motherboard designs.
Is SN74LV244ATPW pin-compatible with older 74LS244 devices?
No. Although functionally similar, SN74LV244ATPW uses TSSOP-20 packaging with 0.65-mm pitch, whereas 74LS244 typically uses PDIP-20 or SOIC-20 (1.27-mm pitch). Pin numbering matches the industry-standard 20-pin logic layout (1OE, 1A1, 1Y1, etc.), but mechanical compatibility requires footprint redesign. Electrical compatibility is maintained via TTL-input thresholds.
What is the thermal resistance (θJA) of SN74LV244ATPW in its TSSOP package?
The datasheet specifies θJA = 83°C/W for the PW package under JEDEC JESD 51-7 conditions. This value assumes standard 2-layer PCB layout with 1-in² copper pour; actual thermal performance improves with additional copper area, thermal vias, or airflow. No exposed thermal pad is present in the TSSOP variant.
SN74LV244ATPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LV244ATPW FAQ
1.How can I place an order for SN74LV244ATPW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATPW 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 SN74LV244ATPW reliable?
The price and inventory of SN74LV244ATPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATPW is usually 5 days.
3.What payment methods are accepted for SN74LV244ATPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244ATPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244ATPW?
SN74LV244ATPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATPW 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 SN74LV244ATPW?
For technical support, including SN74LV244ATPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATPW requirements.
6.How does Aetrix verify that SN74LV244ATPW is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATPW 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 SN74LV244ATPW meets industry standards.
7.What is the process for return or replacement of SN74LV244ATPW?
All SN74LV244ATPW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATPW, 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 SN74LV244ATPW part is unused and in its original packaging.
Return procedure for SN74LV244ATPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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