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Texas Instruments SN74LVC244AN
- Part No.:
- SN74LVC244AN
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LVC244AN.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,286
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Product details
Overview
SN74LVC244AN from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for asynchronous bus interface applications. It operates from 1.65V to 3.6V VCC, supports 5.5V-tolerant inputs, delivers ≤5.9ns propagation delay at 3.3V, and functions across –40°C to +125°C. It enables bidirectional signal isolation in server backplanes and LED display column drivers.
For engineers reviewing the SN74LVC244AN datasheet, SN74LVC244AN pinout, SN74LVC244AN application, or SN74LVC244AN equivalent, key selection criteria include its dual 4-bit bank architecture with independent 3-state control, Ioff-enabled live insertion capability, mixed-mode 5V-to-3.3V translation support, and PDIP-20 package compatibility with legacy through-hole layouts.
Technical Context
The SN74LVC244AN integrates two independent 4-bit buffer banks (1A/1Y and 2A/2Y), each controlled by a dedicated output-enable input (1OE, 2OE). Its CMOS-based 3-state outputs provide balanced sourcing/sinking (±24mA at 3V) and high-impedance disable states with leakage <±10µA.
It implements partial-power-down protection (Ioff) that disables all outputs when VCC = 0V, preventing back-drive damage during hot-swap events. Input clamping diodes allow safe 5.5V input operation even at 1.65V VCC, enabling level translation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V–3.6V: Enables direct integration into 1.8V/2.5V/3.3V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V: Allows interfacing with 5V legacy peripherals while powered from 3.3V rails. |
| tpd (Max) | 5.9ns at 3.3V: Supports >100MHz bus signaling in short-trace applications like LED display column drivers. |
| Ioff Leakage | <±10µA at –40°C to +125°C: Ensures robust live-insertion behavior in modular telecom infrastructure cards. |
| Output Drive | ±24mA at 3V: Sustains reliable driving of 50Ω transmission lines or parallel LED loads without external buffers. |
| Operating Temperature | –40°C to +125°C: Qualified for under-hood automotive modules and industrial motor driver control boards. |
| ESD Rating | ±2000V HBM: Meets IPC-7351B handling requirements for automated SMT assembly lines. |
Pinout & Package
SN74LVC244AN uses a 20-pin plastic dual in-line package (PDIP) with 24.33mm × 9.4mm footprint and 0.1-inch lead pitch, compatible with standard through-hole prototyping and legacy production tooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight buffered data inputs grouped into two 4-bit banks; each bank shares one OE control. |
| 1Y1–1Y4, 2Y1–2Y4 | Output | Eight 3-state outputs; high-impedance state activated when corresponding OE is high. |
| 1OE, 2OE | Input | Active-low enable controls for Bank 1 and Bank 2; tied to VCC via pull-up for power-up high-Z safety. |
| VCC | Power | Primary supply (1.65–3.6V); bypass capacitor required at pin for noise suppression. |
| GND | Ground | Reference return path for all I/O and internal logic; must be low-inductance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Accepts 5.5V inputs at 1.65V VCC-enables direct connection to 5V sensors or controllers without external translators. |
| Ioff partial-power-down | Outputs fully disabled with zero current flow when VCC = 0V-critical for hot-pluggable server modules and field-replaceable units. |
| Balanced CMOS 3-state outputs | Sinks and sources up to ±24mA symmetrically-reduces skew between rising/falling edges in bidirectional bus arbitration. |
| Low ground bounce (VOLP) | <0.8V typical at 3.3V-minimizes noise coupling into adjacent analog circuits on shared PCB layers. |
| Latch-up immunity | >250mA per JESD17-ensures robustness against transient overcurrent events in motor driver gate-drive interfaces. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating CPU address/data buses from expansion slot peripherals in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed access to shared memory-mapped I/O resources. Use Value: Prevents bus contention during hot-swap of PCIe add-in cards while maintaining signal integrity over 10cm traces. |
Use Scenario: Driving 8 parallel columns of high-brightness LEDs in outdoor signage panels. IC Role / Device Role / Timing Role: Current-boosting buffer translating microcontroller GPIO signals to drive 20mA per column. Use Value: Eliminates need for discrete transistor arrays; ±24mA drive sustains uniform brightness across all 8 columns simultaneously. |
| Industrial Motor Controller I/O Expansion | Telecom Line Card Signal Conditioning |
|
Use Scenario: Adding isolated digital I/O to PLC-based motor drives handling PWM feedback and limit-switch inputs. IC Role / Device Role / Timing Role: Level-translating buffer interfacing 24V sensor inputs to 3.3V FPGA logic via optocoupler-isolated paths. Use Value: 5.5V-tolerant inputs accept conditioned 5V logic from isolation barriers; Ioff prevents back-drive during firmware updates. |
Use Scenario: Buffering control signals between baseband processors and RF front-end modules in 5G small cells. IC Role / Device Role / Timing Role: Low-skew repeater ensuring clean enable/disable timing for PA bias control and antenna switching. Use Value: 5.9ns max tpd guarantees sub-10ns timing margin for 100MHz control bus synchronization across multi-chip modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH244A | Includes bus-hold circuitry on all inputs; higher ICC (max 40µA vs. 10µA); same VCC range and pinout. | Eliminates need for external pull-ups on unused inputs in floating-bus systems like I²C expanders. | Select when input stability without external resistors is required; avoid if ultra-low quiescent current is critical. |
| 74LVC244APW | TSSOP-20 package (6.5mm × 6.4mm); identical electrical specs; thermal resistance RθJA = 120.3°C/W vs. 61.6°C/W for PDIP. | Better suited for space-constrained designs but requires reflow soldering and has lower thermal margin in sealed enclosures. | Select for compact surface-mount layouts; retain SN74LVC244AN only when through-hole assembly or thermal headroom >85°C is mandatory. |
Compared with SN74LVCH244A and 74LVC244APW, the SN74LVC244AN offers superior thermal performance in convection-cooled environments and eliminates bus-hold-induced shoot-through risk in high-speed clock distribution, making it preferred for industrial motor control and telecom line card applications requiring long-term reliability.
Availability
SN74LVC244AN is available at Aetrix Electronics and suitable for server backplane interfaces, LED display column drivers, and industrial motor controller I/O expansion requiring stable component supply across extended temperature ranges and legacy through-hole manufacturing.
Supply support for SN74LVC244AN 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVC244AN belongs to TI's LVC logic family, engineered for low-voltage, high-speed bus interface applications where mixed-voltage interoperability, 3-state control, and robust ESD/latch-up performance are essential.
FAQ
What is the maximum operating temperature range for the SN74LVC244AN?
The SN74LVC244AN is specified from –40°C to +125°C for all packages except the ZQN (BGA) variant, which is rated to +85°C. This wide range supports deployment in under-hood automotive ECUs and industrial motor drives where ambient temperatures exceed 100°C. The SN74LVC244AN maintains full functionality-including 5.5V input tolerance and 3-state control-across this entire range.
Can the SN74LVC244AN safely interface a 5V microcontroller with a 3.3V FPGA?
Yes-the SN74LVC244AN accepts input voltages up to 5.5V regardless of VCC level, enabling direct connection from 5V logic to its inputs while powered from 3.3V. Its outputs swing rail-to-rail (0V to 3.3V), matching FPGA I/O voltage requirements. No external level-shifting components are needed, and the SN74LVC244AN maintains this capability across –40°C to +125°C.
Does the SN74LVC244AN support hot-plug insertion in powered-backplane systems?
Yes-the SN74LVC244AN incorporates Ioff circuitry that disables all outputs when VCC = 0V, preventing current back-drive from live system buses into unpowered devices. This feature is validated per JEDEC JESD78 and ensures safe insertion/removal in server backplanes and telecom line cards where SN74LVC244AN serves as a buffer between active and standby modules.
What is the recommended bypass capacitor for the SN74LVC244AN?
A 0.1µF ceramic capacitor placed as close as possible to the VCC pin is recommended for the SN74LVC244AN. For improved high-frequency noise rejection, TI recommends paralleling it with a 1µF capacitor. Both capacitors must connect to a low-inductance ground plane-trace length from capacitor to GND pad should be ≤2mm to maintain effective decoupling below 100MHz.
How does the SN74LVC244AN prevent bus contention in multi-driver systems?
The SN74LVC244AN prevents bus contention through its dual independent 3-state control architecture: each 4-bit bank (1Y/2Y) has its own active-low OE pin. By asserting only one OE at a time, designers ensure only one driver actively drives the bus while others remain in high-impedance state. This hardware-level arbitration eliminates timing-critical software coordination, and the SN74LVC244AN's fast enable/disable times (<9.4ns) minimize contention windows.
SN74LVC244AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74LVC244AN FAQ
1.How can I place an order for SN74LVC244AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244AN 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 SN74LVC244AN reliable?
The price and inventory of SN74LVC244AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244AN is usually 5 days.
3.What payment methods are accepted for SN74LVC244AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC244AN?
SN74LVC244AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244AN 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 SN74LVC244AN?
For technical support, including SN74LVC244AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244AN requirements.
6.How does Aetrix verify that SN74LVC244AN is sourced from the original manufacturer or authorized distributors?
All SN74LVC244AN 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 SN74LVC244AN meets industry standards.
7.What is the process for return or replacement of SN74LVC244AN?
All SN74LVC244AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244AN, 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 SN74LVC244AN part is unused and in its original packaging.
Return procedure for SN74LVC244AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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