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Texas Instruments SN74LVT244BNS
- Part No.:
- SN74LVT244BNS
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVT244BNS.pdf
- Description:
- IC BUFF/DVR 3-ST DUAL 20SO
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Product details
Overview
SN74LVT244BNS from Fairchild Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs, designed for memory address and clock bus driving in 3.3V systems interfacing to 5V TTL logic. It features ±32mA/±64mA drive capability, operates from 2.7V to 3.6V VCC, supports –40°C to +85°C industrial temperature range, and provides glitch-free power-up/down high-impedance behavior.
For engineers reviewing the SN74LVT244BNS datasheet, SN74LVT244BNS pinout, SN74LVT244BNS application, or SN74LVT244BNS equivalent, key selection criteria include 3.3V-compatible 5V-tolerant I/O, dual 4-bit 3-STATE enable control (OE1/OE2), bushold-free input architecture, SOIC-20 package compatibility, and BiCMOS-based high-speed/low-power tradeoff.
Technical Context
The SN74LVT244BNS implements two independent 4-bit non-inverting buffers, each controlled by separate 3-STATE output enables (OE1, OE2). Its BiCMOS process delivers ABT-class speed (tPLH/tPHL ≤ 4.0 ns at 3.3V) while maintaining low ICCZ (0.19 mA) in disabled state.
All eight inputs tolerate 0–5.5V DC voltage and interface directly to 5V TTL buses without level shifters. Outputs drive ±32mA (HIGH) / +64mA (LOW) into terminated lines, supporting robust signal integrity on dense PCBs with minimal external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V–3.6V - Ensures stable operation in modern 3.3V supply domains with ±0.3V margin. |
| IOL / IOH | +64mA / –32mA - Drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL | ≤4.0 ns @ 3.3V - Enables high-speed address/data bus buffering in sub-10ns timing-critical paths. |
| VIH / VIL | 2.0V / 0.8V - Guarantees reliable 5V TTL logic level recognition at 3.3V supply. |
| ICCZ | 0.19 mA - Minimizes standby current when outputs are disabled, critical for low-power system states. |
| ESD Rating | HBM > 2000V - Provides robust handling during board assembly and field service without special precautions. |
Pinout & Package
SN74LVT244BNS is supplied in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (Package Code: M20B), with standard 1.27 mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enables for first and second group of four outputs (O0–O3, O4–O7). |
| 2–9 | I0–I7 | Eight buffered data inputs; no bushold - require external termination if unused. |
| 11–18 | O0–O7 | Eight non-inverting 3-STATE outputs; capable of sourcing –32mA or sinking +64mA. |
| 10 | GND | Ground reference for all logic and output stages; decoupling capacitor must be placed adjacent. |
| 20 | VCC | 3.3V supply input; requires local 0.1 µF ceramic bypass capacitor to minimize switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Accepts 0–5.5V input signals while powered from 3.3V, eliminating level translators in mixed-voltage systems. |
| Glitch-free 3-STATE control | Power-up/down high-impedance ensures no bus contention during supply ramp, simplifying system reset sequencing. |
| High drive strength | ±32mA/±64mA output capability drives 50Ω transmission lines or up to 10 standard TTL loads directly. |
| Low static current | 0.19 mA supply current in 3-STATE mode reduces system-level quiescent power in idle states. |
| Live insertion support | Withstands hot-plug events without latch-up or damage, enabling modular backplane and card-edge applications. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
|
Use Scenario: Driving 32-bit address bus from a 3.3V microcontroller to multiple 5V SRAM chips on a shared memory subsystem. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing level translation, fanout expansion, and bus isolation between voltage domains. Use Value: Eliminates need for discrete level shifters and pull-up networks while maintaining <4ns propagation delay across all eight channels. |
Use Scenario: Distributing a 50MHz system clock from a PLL to six 5V FPGA configuration banks with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew (≤1.0ns) line driver ensuring simultaneous clock edge arrival across multiple receivers. Use Value: Achieves deterministic setup/hold timing margins due to guaranteed tOSHL/tOSLH ≤1.0ns and low COUT (6 pF). |
| Industrial Bus Transceiver Interface | Legacy Peripheral Expansion |
|
Use Scenario: Interfacing a 3.3V ARM-based PLC CPU to legacy 5V RS-485 transceivers and CAN controllers via shared control/data bus. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling safe 3.3V-to-5V signal coupling with controlled drive strength and ESD protection. Use Value: HBM >2000V rating and latch-up immunity (>500mA) ensure reliability in electrically noisy factory environments. |
Use Scenario: Adding ISA-style parallel port functionality to a modern embedded motherboard using legacy printer or scanner peripherals. IC Role / Device Role / Timing Role: Octal line driver translating 3.3V GPIO outputs to 5V-compatible strobe, data, and status signals. Use Value: Functional compatibility with 74LS244 allows drop-in replacement in existing schematics with no logic redesign required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH244WM | Includes bushold inputs; eliminates need for external pull-ups on unused inputs. | Better suited for systems with floating or intermittently driven inputs (e.g., hot-swap modules). | Select 74LVTH244WM if input termination simplicity is prioritized over strict functional equivalence to SN74LVT244BNS. |
| SN74LVC244APWR | Lower drive (±24mA), wider VCC range (1.65–3.6V), no 5V-tolerant inputs (max VI = VCC+0.3V). | Requires level-shifting for 5V bus interfacing; optimized for ultra-low-voltage portable designs. | Choose SN74LVC244APWR only in fully 3.3V-only systems where cost and power efficiency outweigh 5V interface needs. |
Compared with SN74LVT244BNS, 74LVTH244WM adds bushold for input stability but shares identical timing, drive, and packaging; SN74LVC244APWR sacrifices 5V tolerance and drive strength for lower voltage operation and reduced static power.
Availability
SN74LVT244BNS is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial bus interfaces, and legacy peripheral expansion requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74LVT244BNS 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
Fairchild Semiconductor was a leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The SN74LVT244BNS belongs to Fairchild's LVT (Low-Voltage TTL) family, engineered for high-speed 3.3V bus interfacing with backward compatibility to 5V TTL systems in memory, clock, and control applications.
FAQ
What is the maximum operating voltage for SN74LVT244BNS inputs?
The SN74LVT244BNS supports DC input voltages from –0.5V to +5.5V regardless of VCC, enabling direct connection to 5V TTL buses while powered from 3.3V. This 5V-tolerance is specified under Recommended Operating Conditions and verified across –40°C to +85°C ambient temperature.
Does SN74LVT244BNS have bushold circuitry on its inputs?
No, SN74LVT244BNS does not include bushold functionality. That feature is exclusive to the LVTH variant (e.g., 74LVTH244). Unused inputs on SN74LVT244BNS must be externally terminated to VCC or GND to prevent floating states and potential noise-induced switching.
What is the typical propagation delay of SN74LVT244BNS at 3.3V?
At VCC = 3.3V and TA = 25°C, the typical propagation delay (tPLH/tPHL) of SN74LVT244BNS is 2.5 ns, with a maximum guaranteed value of 4.0 ns over the full industrial temperature range (–40°C to +85°C) and supply variation (2.7V–3.6V).
Can SN74LVT244BNS drive standard TTL loads directly?
Yes, SN74LVT244BNS can drive up to 10 standard TTL loads per output due to its +64mA sink and –32mA source capability. Its VOH ≥ VCC–0.2V and VOL ≤ 0.55V at IOL = 64mA meet TTL voltage thresholds even at worst-case VCC = 2.7V.
Is SN74LVT244BNS pin-compatible with older 74-series 244 devices?
SN74LVT244BNS is functionally compatible with the 74 series 244 and uses the same 20-pin SOIC footprint (JEDEC MS-013), but differs in electrical behavior: it operates at 3.3V VCC, offers higher drive strength, and supports 5V-tolerant inputs - making it a direct upgrade path without PCB changes.
SN74LVT244BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVT244BNS FAQ
1.How can I place an order for SN74LVT244BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT244BNS 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 SN74LVT244BNS reliable?
The price and inventory of SN74LVT244BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT244BNS is usually 5 days.
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SN74LVT244BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT244BNS 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 SN74LVT244BNS?
For technical support, including SN74LVT244BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT244BNS requirements.
6.How does Aetrix verify that SN74LVT244BNS is sourced from the original manufacturer or authorized distributors?
All SN74LVT244BNS 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 SN74LVT244BNS meets industry standards.
7.What is the process for return or replacement of SN74LVT244BNS?
All SN74LVT244BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT244BNS, 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 SN74LVT244BNS part is unused and in its original packaging.
Return procedure for SN74LVT244BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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