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Texas Instruments SN74LVC2244APWRE4
- Part No.:
- SN74LVC2244APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC2244APWRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,454
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Product details
Overview
SN74LVC2244APWRE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for 1.65 V to 3.6 V operation, featuring dual 4-bit channels with independent output-enable (1OE, 2OE), 5.5 ns max propagation delay at 3.3 V, and 26-Ω integrated output series resistance - used in bus interface, level translation, and I/O expansion in mixed-voltage systems.
For engineers reviewing the SN74LVC2244APWRE4 datasheet, SN74LVC2244APWRE4 pinout, SN74LVC2244APWRE4 application, or SN74LVC2244APWRE4 equivalent, key selection criteria include its Ioff support for live insertion, 5.5 V-tolerant inputs, ±12 mA output drive capability, and TSSOP-20 package compatibility with space-constrained industrial and computing designs.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each controlled by a dedicated active-low output-enable input (1OE, 2OE). When enabled, signals pass from A-inputs (1A1–1A4, 2A1–2A4) to Y-outputs (1Y1–1Y4, 2Y1–2Y4); when disabled, outputs enter high-impedance state.
It supports mixed-mode signal operation: inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), enabling reliable 5-V-to-3.3-V level translation. The Ioff feature ensures isolation between powered and unpowered system domains, preventing back-drive current during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into low-voltage logic rails including 1.8 V, 2.5 V, and 3.3 V systems. |
| Max tpd | 5.5 ns at VCC = 3.3 V - supports high-speed data transfer in memory buffers and peripheral interfaces. |
| Output Drive | ±12 mA per output - sufficient to drive standard CMOS loads and moderate capacitive buses without external buffers. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe interfacing with legacy 5-V logic without level-shifting circuitry. |
| Ioff Support | Active at VCC = 0 V - enables hot-plug capability and prevents current leakage during power sequencing. |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements for handling and board assembly. |
| Operating Temp | –40°C to +125°C - qualified for extended temperature applications in automotive and industrial control environments. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm body size), lead-free with NiPdAu finish, moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for Group 1 and Group 2 buffers respectively; tied high via pullup for default high-Z on power-up. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered input terminals - accept 5.5 V-tolerant logic signals across both groups. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | Eight 3-state outputs with built-in 26-Ω series resistance - reduces overshoot/undershoot and eliminates need for external termination resistors. |
| 10 | GND | Ground reference for all logic and output stages; must be low-impedance connection to minimize noise coupling. |
| 20 | VCC | Primary power supply pin - requires local 0.1 µF bypass capacitor placed adjacent to pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 26-Ω Output Series Resistance | Eliminates need for external termination resistors, simplifying PCB layout and reducing BOM count in high-speed digital interfaces. |
| 5.5 V-Tolerant Inputs | Enables seamless interfacing between 3.3 V logic domains and legacy 5 V peripherals without external translators or voltage clamps. |
| Ioff Partial-Power-Down Protection | Prevents damaging back-current flow when VCC is off, supporting hot-swap functionality in modular computing and telecom equipment. |
| Low Ground/Bounce (VOLP & VOHV) | Typical VOLP <0.8 V and VOHV >2 V at 3.3 V - maintains signal integrity and reduces switching noise in dense logic layouts. |
| Latch-Up Immunity | Exceeds 250 mA per JESD17 - ensures robust operation under transient overvoltage or ESD stress conditions. |
Applications
| Industrial Bus Interface | Memory Expansion Module |
|---|---|
|
Use Scenario: Isolating and buffering address/data lines between microcontroller and external SRAM or flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as bidirectional 3-state buffer with independent group enables to manage shared memory bus contention and timing alignment. Use Value: Integrated 26-Ω output resistance suppresses ringing on 10–20 cm traces, eliminating need for discrete termination and improving setup/hold margin at 25 MHz access rates. |
Use Scenario: Driving multiple parallel I/O expanders or GPIO port extenders from a single MCU in factory automation HMIs. IC Role / Device Role / Timing Role: Provides eight high-drive, 3-state outputs to fan out control signals while maintaining voltage-level compatibility across mixed-supply subsystems. Use Value: 5.5 V-tolerant inputs allow direct connection to 5 V I²C/SPI peripheral logic, avoiding level-shifters and reducing interconnect latency by ~3 ns per stage. |
| Server Baseboard Management | Test Equipment Signal Conditioning |
|
Use Scenario: Buffering sensor telemetry and status signals (temperature, fan speed, voltage rails) from server motherboard to BMC controller. IC Role / Device Role / Timing Role: Serves as fault-isolated signal conditioner with Ioff protection, ensuring BMC retains visibility during CPU power cycling. Use Value: Ioff behavior prevents backfeed from powered BMC into unpowered sensor domain, meeting IPMI v2.0 hot-swap compliance requirements. |
Use Scenario: Driving calibrated test loads in automated test equipment (ATE) for logic analyzer channel conditioning and signal integrity validation. IC Role / Device Role / Timing Role: Functions as precision-controlled output driver with matched rise/fall times and predictable propagation delay variation (<0.5 ns across temperature). Use Value: Max tpd of 5.5 ns at 3.3 V enables sub-10 ns timing resolution in pattern generators, supporting IEEE 1149.6 AC-JTAG boundary scan testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Same functional architecture but lacks Ioff specification; rated only down to –40°C to +85°C operating range. | Suitable for commercial-grade embedded systems where partial-power-down is not required. | Select SN74LVC244APWR only if thermal environment stays within 85°C and hot-swap is unnecessary. |
| 74LVC2244PW,118 (Nexperia) | Pin-compatible TSSOP-20 variant with identical VCC range and 5.5 V-tolerant inputs; max tpd = 6.0 ns at 3.3 V. | Valid for cost-sensitive consumer electronics where 0.5 ns timing margin is acceptable. | Choose 74LVC2244PW,118 when sourcing flexibility or dual-sourcing strategy is prioritized over TI-specific qualification. |
Compared with SN74LVC2244APWRE4, SN74LVC244APWR offers no Ioff protection and reduced temperature rating, while 74LVC2244PW,118 trades 0.5 ns propagation delay for broader supplier availability - making SN74LVC2244APWRE4 optimal for industrial hot-swap and extended-temp designs requiring guaranteed Ioff and 125°C operation.
Availability
SN74LVC2244APWRE4 is available at Aetrix Electronics and suitable for industrial bus interface, memory expansion module, and server baseboard management applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74LVC2244APWRE4 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 leader specializing in analog and embedded processing technologies, with decades of expertise in logic IC design, manufacturing, and automotive/industrial qualification.
The SN74LVC2244A product line delivers high-speed, low-voltage octal buffers optimized for mixed-signal interfacing, level translation, and I/O expansion in space- and power-constrained systems.
FAQ
What is the maximum operating temperature for SN74LVC2244APWRE4?
The SN74LVC2244APWRE4 is fully specified for operation from –40°C to +125°C ambient temperature. This extended range is validated across all electrical parameters including propagation delay, output drive, and Ioff behavior - making it suitable for under-hood automotive modules and industrial motor drives where thermal margins exceed 100°C.
Does SN74LVC2244APWRE4 support 5-V input signals while powered at 3.3 V?
Yes, SN74LVC2244APWRE4 accepts input voltages up to 5.5 V regardless of VCC level (1.65–3.6 V), enabling direct connection to 5-V logic families without external level shifters. This is explicitly guaranteed in the datasheet's Recommended Operating Conditions table under "VI Input voltage" parameter.
What is the purpose of the 26-Ω series resistance on SN74LVC2244APWRE4 outputs?
The 26-Ω on-die series resistance in SN74LVC2244APWRE4 outputs dampens signal edge overshoot and undershoot, particularly on unterminated PCB traces. It eliminates the need for external series termination resistors, reducing component count and layout complexity while maintaining signal integrity at frequencies up to 100 MHz.
How does Ioff functionality work in SN74LVC2244APWRE4?
Ioff in SN74LVC2244APWRE4 disables all output paths when VCC = 0 V, blocking current flow between powered and unpowered sections of a system. This protects downstream components during hot-insertion events and ensures safe partial-power-down operation - a requirement verified per JEDEC JESD78.
Is SN74LVC2244APWRE4 pin-compatible with other TSSOP-20 octal buffers?
SN74LVC2244APWRE4 uses standard TSSOP-20 pinout defined in TI's DBQ/DW/PW package drawings. It is functionally and physically compatible with SN74LVC244APWR and 74LVC2244PW,118, though Ioff support and temperature rating differ - always verify enable logic polarity and timing specs before substitution.
SN74LVC2244APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC2244APWRE4 FAQ
1.How can I place an order for SN74LVC2244APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2244APWRE4 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 SN74LVC2244APWRE4 reliable?
The price and inventory of SN74LVC2244APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2244APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC2244APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2244APWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2244APWRE4?
SN74LVC2244APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2244APWRE4 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 SN74LVC2244APWRE4?
For technical support, including SN74LVC2244APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2244APWRE4 requirements.
6.How does Aetrix verify that SN74LVC2244APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC2244APWRE4 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 SN74LVC2244APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC2244APWRE4?
All SN74LVC2244APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2244APWRE4, 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 SN74LVC2244APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC2244APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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