My Inquiry
My Account
Texas Instruments SN74LV244ATDBRE4
- Part No.:
- SN74LV244ATDBRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV244ATDBRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LV244ATDBRE4 from Texas Instruments is an octal 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-voltage-compatible inputs, supports partial-power-down via Ioff, and delivers typical propagation delay of 5.4 ns at 5 V.
For engineers reviewing the SN74LV244ATDBRE4 datasheet, SN74LV244ATDBRE4 pinout, SN74LV244ATDBRE4 application, or SN74LV244ATDBRE4 equivalent, key selection criteria include 3-state output control timing (tPZH/tPLZ ≤ 12 ns), Ioff protection for backflow prevention, and SSOP-20 package compatibility with legacy board layouts.
Technical Context
This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) inputs (1OE and 2OE). Logic operation follows positive-logic enable: low OE enables data flow from A inputs to Y outputs; high OE forces all eight outputs into high-impedance state.
It integrates Ioff circuitry to disable outputs during partial power-down, preventing damaging current backflow when VCC = 0. Input voltage range extends to 5.5 V regardless of VCC, supporting mixed-mode voltage interfacing across 3.3-V and 5-V domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation in standard 5-V digital systems with ±10% supply tolerance. |
| Propagation Delay (tpd) | 5.4 ns typical at 5 V, CL = 15 pF - enables high-speed bus driving up to ~100 MHz system clock domains. |
| Ioff Current | <5 µA at 0–5.5 V - guarantees safe isolation during power sequencing or hot-swap scenarios without external blocking diodes. |
| Output Drive (IOL/IOH) | ±16 mA at VCC = 4.5–5.5 V - sufficient to drive 50-pF loads with <10 ns edge rates and maintain signal integrity on PCB traces. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - allows direct interface 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 handling and assembly. |
Pinout & Package
SN74LV244ATDBRE4 uses a 20-pin SSOP (Shrink Small-Outline Package) with 0.65 mm lead pitch, 7.2 mm × 5.3 mm body size, and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for first and second 4-bit buffer sections - must be pulled high via resistor during power-up to ensure defined high-Z state. |
| 2, 4, 6, 8 | 1A1–1A4 | Inputs to first 4-bit buffer section - accept TTL-compatible signals and pass through to corresponding Y outputs when 1OE = L. |
| 3, 5, 7, 9 | 1Y1–1Y4 | Noninverting 3-state outputs of first buffer section - present high-impedance state when 1OE = H, reducing bus contention. |
| 11, 13, 15, 17 | 2A1–2A4 | Inputs to second 4-bit buffer section - electrically isolated from first section but share same VCC/GND rails. |
| 12, 14, 16, 18 | 2Y1–2Y4 | Noninverting 3-state outputs of second buffer section - independently controllable via 2OE for dual-bus or bidirectional path management. |
| 10, 20 | GND, VCC | Power supply terminals - require local 0.1-µF ceramic decoupling near pin 10 (GND) and pin 20 (VCC) to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface support | Inputs tolerate up to 5.5 V independent of VCC - enables reliable connection between 3.3-V microcontrollers and 5-V peripheral buses. |
| Partial-power-down protection (Ioff) | Blocks current flow when VCC = 0 - eliminates need for external isolation components in multi-rail power systems. |
| Low ground bounce (VOLP < 0.8 V) | Minimizes simultaneous switching noise on shared GND planes - critical for maintaining signal integrity in dense digital layouts. |
| Controlled output undershoot/overshoot | VOHV > 2.3 V and VOLP < 0.8 V at 5 V - reduces risk of false triggering in downstream CMOS receivers. |
| Thermal performance | θJA = 70°C/W in DB package - supports continuous operation at full drive strength up to 85°C ambient without derating. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or flash devices sharing a common bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU address outputs and enabling time-multiplexed access to multiple memory chips. Use Value: Prevents bus contention during chip-select transitions and maintains signal rise/fall times under 10 ns with 50-pF load. | Use Scenario: Isolating PLC CPU data bus from field I/O modules operating at different voltage levels. IC Role / Device Role / Timing Role: Level-tolerant octal driver providing bidirectional data path control between 3.3-V controller and 5-V sensor interface cards. Use Value: Eliminates need for discrete level shifters while supporting hot-plug detection via Ioff-enabled power sequencing. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
Use Scenario: Distributing a 25-MHz system clock to multiple FPGA configuration ICs and peripheral controllers. IC Role / Device Role / Timing Role: Low-skew clock buffer with matched tPLH/tPHL ensuring synchronous startup across multiple devices. Use Value: Delivers sub-100-ps skew between outputs and maintains jitter below 150 ps RMS over temperature. | Use Scenario: Conditioning digital stimulus signals from automated test equipment before applying to DUT input pins. IC Role / Device Role / Timing Role: Programmable signal gate controlling pulse delivery timing and impedance matching to DUT input capacitance. Use Value: Enables precise enable/disable timing (tPZH/tPLZ ≤ 12 ns) and drives 100-pF probe+fixture loads without waveform distortion. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), higher speed (tpd = 3.8 ns), no Ioff | Optimized for 3.3-V-only systems; lacks partial-power-down capability | Select when operating exclusively at 3.3 V and maximum speed is prioritized over power sequencing robustness. |
| 74ACT244SCX | Higher drive (±24 mA), wider VCC (4.5–5.5 V), no Ioff, higher ICC | Legacy 5-V TTL-compatible family with greater noise immunity but no power-down isolation | Choose for legacy 5-V designs requiring stronger drive and ESD tolerance exceeding 4-kV HBM. |
Compared with SN74LV244ATDBRE4, SN74LVC244APWR offers faster switching in low-voltage systems but sacrifices Ioff protection, while 74ACT244SCX provides higher drive strength and noise margin at the cost of increased quiescent current and absence of power-down safety features.
Availability
SN74LV244ATDBRE4 is available at Aetrix Electronics and suitable for memory-address buffering, industrial bus transceivers, legacy clock distribution, and test equipment signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for SN74LV244ATDBRE4 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 over 50 years of leadership in industrial and automotive electronics.
The SN74LV244AT series belongs to TI's LV logic family, engineered for low-voltage 5-V operation with enhanced noise immunity and power-down safety-targeting industrial control, instrumentation, and legacy-system upgrades.
FAQ
What is the recommended power-up sequence for SN74LV244ATDBRE4 to avoid undefined output states?
TI specifies that OE pins must be held high (via pullup resistor to VCC) during power-up to guarantee high-impedance outputs before internal logic stabilizes. For SN74LV244ATDBRE4, use a 10-kΩ pullup on both 1OE and 2OE. This prevents bus contention when VCC ramps and ensures deterministic behavior per the functional table's "Z" output condition under OE = H.
Does SN74LV244ATDBRE4 support operation at 3.3 V VCC?
No. SN74LV244ATDBRE4 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 results in unreliable output drive, increased propagation delay, and potential failure to meet VIH/VIL thresholds. Use SN74LVC244A instead for true 3.3-V compatibility.
How does the Ioff feature of SN74LV244ATDBRE4 protect system-level interconnects?
The Ioff circuitry in SN74LV244ATDBRE4 disables all outputs when VCC = 0 V, limiting reverse current to <5 µA even if input or output pins are driven externally. This prevents damaging backflow through powered-down sections of a multi-rail system-critical when interfacing with live 5-V buses while the buffer's VCC rail is off, as confirmed by JESD78 latch-up testing.
Can SN74LV244ATDBRE4 drive a 100-pF capacitive load while maintaining timing specifications?
Yes, but with timing degradation. The datasheet specifies tPLH/tPHL = 5.4 ns (typical) at CL = 15 pF. At CL = 50 pF, delay increases to 5.9 ns. While not explicitly tested at 100 pF, extrapolation using ∆t/∆v = 20 ns/V and load-dependent RC effects indicates delays will exceed 8 ns. For 100-pF loads, verify setup/hold margins in your design or add series termination.
What is the thermal resistance (θJA) of SN74LV244ATDBRE4 in its SSOP-20 package?
The θJA for SN74LV244ATDBRE4 in the DB (SSOP-20) package is 70°C/W, measured per JESD51-7. This value assumes standard JEDEC 2S2P test board conditions. Actual board-level thermal performance depends on copper area, via count, and airflow; for sustained 16-mA output loading at 85°C ambient, derate power dissipation to ≤150 mW unless enhanced heatsinking is implemented.
SN74LV244ATDBRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
SN74LV244ATDBRE4 FAQ
1.How can I place an order for SN74LV244ATDBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATDBRE4 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 SN74LV244ATDBRE4 reliable?
The price and inventory of SN74LV244ATDBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATDBRE4 is usually 5 days.
3.What payment methods are accepted for SN74LV244ATDBRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244ATDBRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244ATDBRE4?
SN74LV244ATDBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATDBRE4 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 SN74LV244ATDBRE4?
For technical support, including SN74LV244ATDBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATDBRE4 requirements.
6.How does Aetrix verify that SN74LV244ATDBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATDBRE4 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 SN74LV244ATDBRE4 meets industry standards.
7.What is the process for return or replacement of SN74LV244ATDBRE4?
All SN74LV244ATDBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATDBRE4, 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 SN74LV244ATDBRE4 part is unused and in its original packaging.
Return procedure for SN74LV244ATDBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LV244ATDBRE4 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
