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Texas Instruments SN74LVTH240DB
- Part No.:
- SN74LVTH240DB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH240DB.pdf
- Description:
- IC INVERTER DUAL 4-INPUT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:20,751
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Product details
Overview
SN74LVTH240DB from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for memory address and clock distribution in 3.3V systems interfacing to 5V TTL buses. It features bushold inputs (eliminating external pull-ups), ±32mA/64mA drive capability, and operates from 2.7V to 3.6V supply. Used in high-density bus-oriented transmitter/receiver applications.
For engineers reviewing the SN74LVTH240DB datasheet, SN74LVTH240DB pinout, SN74LVTH240DB application, or SN74LVTH240DB equivalent, key selection criteria include bushold input support, 3.3V–5V interface compatibility, 3-STATE timing (tPZH ≤ 5.6 ns), output drive strength (IOL = 64 mA), and SOIC-20 package mechanical fit.
Technical Context
The SN74LVTH240DB implements dual 4-bit inverting buffers with independent 3-STATE enable controls (OE1/OE2), each managing four outputs. Its bushold circuitry actively maintains input logic state without external biasing, supporting live insertion and glitch-free power-up/down behavior.
Designed in advanced BiCMOS technology, it delivers ABT-class speed (tPLH/tPHL ≤ 4.6 ns at 3.3V) while maintaining low static current (ICCZ = 0.19 mA). Input voltage tolerance extends to 5.5V, enabling robust interfacing with legacy 5V TTL systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Specifies valid core supply for reliable 3.3V system operation with margin. |
| IOL / IOH | 64 mA / –32 mA - Enables direct driving of heavy capacitive loads or multiple TTL inputs without buffering. |
| tPZH (max) | 5.6 ns at VCC = 2.7 V - Defines worst-case enable-to-output delay for synchronous bus control timing budgets. |
| VIH / VIL | 2.0 V / 0.8 V - Ensures clean logic recognition of 5V-tolerant inputs across industrial temperature range (–40°C to +85°C). |
| CIN / COUT | 3 pF / 6 pF - Low input/output capacitance minimizes signal distortion and loading on high-speed traces. |
| II(HOLD) | ±75 µA at VCC = 3.0 V - Quantifies minimum current required to override bushold, enabling deterministic forced-state control. |
| ESD Rating | HBM > 2000 V - Supports handling and assembly in standard electronics manufacturing environments without special ESD controls. |
Pinout & Package
SN74LVTH240DB is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with 1.27 mm lead pitch and gull-wing terminations. Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enable inputs controlling outputs O0–O3 (OE1) and O4–O7 (OE2) independently. |
| 2–9 | I0–I7 | Inverting data inputs; bushold enabled - retains last valid logic state when floating. |
| 11–18 | O0–O7 | Inverting 3-STATE outputs; sink up to 64 mA or source up to 32 mA in active state. |
| 10 | GND | Ground reference for all internal circuitry and output drivers. |
| 20 | VCC | 3.3V supply input; supports 5V-tolerant I/O but must be regulated within 2.7–3.6 V range. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold inputs | Eliminates need for external pull-up resistors on unused I0–I7 pins, reducing BOM count and board space in sparse bus configurations. |
| 5V-tolerant I/O | Accepts 0–5.5V input signals and drives 5V TTL loads while powered from 3.3V, enabling mixed-voltage system interconnect. |
| Glitch-free 3-STATE | Power-up/down high-impedance ensures no bus contention during supply ramp, critical for hot-swap and power sequencing. |
| High drive strength | 64 mA sink capability allows direct connection to 10+ TTL loads or long PCB traces without signal degradation. |
| Low dynamic noise | VOLP/VOLV specs (±0.8 V) limit ground bounce and crosstalk in dense multi-driver layouts. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fanout expansion, and bus isolation via 3-STATE control. Use Value: Bushold prevents floating address lines during reset; 64 mA drive ensures setup/hold timing margins across 10 cm traces. |
Use Scenario: Distributing a system clock from a 3.3V oscillator to multiple 5V logic blocks (e.g., FPGA configuration, peripheral controllers). IC Role / Device Role / Timing Role: Low-skew (≤1.0 ns) inverting line driver with matched propagation delays across all eight outputs. Use Value: tOSHL/tOSLH ≤ 1.0 ns minimizes clock skew between receivers; 3-STATE enables dynamic clock gating without termination changes. |
| Bus Transceiver Interface | Legacy System Upgrade |
Use Scenario: Bidirectional data bus interface between a 3.3V SoC and legacy 5V peripherals (e.g., ISA-style I/O cards). IC Role / Device Role / Timing Role: Direction-controlled octal buffer acting as unidirectional transmitter/receiver with OE-gated 3-STATE outputs. Use Value: Independent OE1/OE2 allows interleaved read/write cycles; 5.5V input tolerance avoids level-shifter ICs on control lines. |
Use Scenario: Retrofitting 5V-only backplane systems with modern 3.3V processors while retaining existing bus drivers and receivers. IC Role / Device Role / Timing Role: Drop-in replacement for 74LS240/74ALS240 with identical pinout and function, adding bushold and lower power. Use Value: Pin-compatible with 74-series footprints; reduced ICC (5 mA vs. ~20 mA typical for LS) lowers thermal load in dense chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT240DB | No bushold inputs; requires external pull-ups on unused inputs. | Suitable where input states are always driven; lower input leakage (±1 µA vs. ±75 µA bushold hold current). | Select when bushold is unnecessary and lowest possible input bias current is required. |
| 74ALVC240PW | Non-inverting outputs; 3.3V-only I/O (no 5V tolerance); smaller TSSOP-20 package (4.4 mm width). | Used in compact 3.3V-only designs where polarity inversion is undesirable and board space is constrained. | Choose when inverting logic is incompatible with system architecture and 5V interfacing is not needed. |
Compared with SN74LVT240DB and 74ALVC240PW, SN74LVTH240DB uniquely combines bushold, 5V-tolerant inputs, and inverting logic in SOIC-20 - making it optimal for upgrading legacy 5V buses with minimal layout change and no external bias components.
Availability
SN74LVTH240DB is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SN74LVTH240DB 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 designer of high-performance analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016. Its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The SN74LVTH240DB belongs to Fairchild's LVT/H series of low-voltage BiCMOS buffers, engineered for 3.3V systems needing robust 5V interface compatibility, high drive strength, and enhanced reliability in dense PCB layouts.
FAQ
What is the function of bushold in SN74LVTH240DB?
The bushold circuit in SN74LVTH240DB actively maintains the last valid logic state on inputs I0–I7 when left floating, eliminating the need for external pull-up or pull-down resistors. This reduces component count and improves reliability in systems with partially used data buses. SN74LVTH240DB leverages this feature to simplify design in memory and address buffering applications where some inputs may remain unconnected.
Can SN74LVTH240DB interface directly with 5V TTL logic?
Yes, SN74LVTH240DB supports 5V-tolerant inputs (VI up to 5.5V) and can drive 5V TTL loads with its 64 mA sink capability. Its output HIGH voltage (VOH ≥ 2.0 V at IOL = 24 mA) meets TTL VIH requirements, and its 3.3V supply ensures compatibility with modern low-voltage controllers. SN74LVTH240DB is explicitly designed for this mixed-voltage interoperability.
What is the maximum operating temperature for SN74LVTH240DB?
SN74LVTH240DB is rated for free-air operating temperatures from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is confirmed in the Recommended Operating Conditions table and validated across all DC and AC specifications, including propagation delay and output drive performance. SN74LVTH240DB maintains full functionality across this full range without derating.
How does SN74LVTH240DB handle power-up sequencing?
SN74LVTH240DB features power-up/power-down high-impedance outputs, ensuring all O0–O7 pins enter 3-STATE before VCC reaches valid operating levels. This prevents bus contention during supply ramp and eliminates glitches on shared data/address lines. SN74LVTH240DB achieves this through internal biasing that overrides OE states until VCC stabilizes, supporting robust hot-swap and multi-rail power sequencing.
Is SN74LVTH240DB pin-compatible with standard 74-series 240 devices?
Yes, SN74LVTH240DB uses the same 20-pin SOIC footprint and pinout as industry-standard 74LS240 and 74ALS240, including identical placement of VCC (pin 20), GND (pin 10), OE1/OE2 (pins 1/19), and I/O assignments. SN74LVTH240DB provides functional drop-in replacement capability while adding bushold, lower power, and 3.3V operation - verified in Fairchild's ordering information and connection diagrams.
SN74LVTH240DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVTH240DB FAQ
1.How can I place an order for SN74LVTH240DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH240DB 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 SN74LVTH240DB reliable?
The price and inventory of SN74LVTH240DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH240DB is usually 5 days.
3.What payment methods are accepted for SN74LVTH240DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH240DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH240DB?
SN74LVTH240DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH240DB 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 SN74LVTH240DB?
For technical support, including SN74LVTH240DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH240DB requirements.
6.How does Aetrix verify that SN74LVTH240DB is sourced from the original manufacturer or authorized distributors?
All SN74LVTH240DB 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 SN74LVTH240DB meets industry standards.
7.What is the process for return or replacement of SN74LVTH240DB?
All SN74LVTH240DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH240DB, 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 SN74LVTH240DB part is unused and in its original packaging.
Return procedure for SN74LVTH240DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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