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Texas Instruments SN74LVCZ240ADW
- Part No.:
- SN74LVCZ240ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVCZ240ADW.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:398
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Product details
Overview
SN74LVCZ240ADW from Texas Instruments is an octal buffer with power-up 3-state outputs, configured as two independent 4-channel banks each controlled by an active-low output enable pin. It operates from 2.7V to 3.6V, accepts 5.5V-tolerant inputs, delivers ≤6.5ns propagation delay at 3.3V, and supports hot insertion via Ioff and power-up 3-state functionality. It is used in mixed-voltage bus interfacing between 3.3V logic and 5V peripherals.
For engineers reviewing the SN74LVCZ240ADW datasheet, SN74LVCZ240ADW pinout, SN74LVCZ240ADW application, or SN74LVCZ240ADW equivalent, key selection criteria include its dual-bank 3-state control, 5.5V input tolerance with 3.3V VCC, ground bounce <0.8V, VOH undershoot >2V, and SOIC-20 package compatibility for legacy board designs.
Technical Context
The SN74LVCZ240ADW implements eight CMOS inverters with Schmitt-trigger inputs and balanced 3-state outputs - four per bank (1Y1–1Y4 and 2Y1–2Y4), each enabled independently by OE1 or OE2. Its Ioff circuitry disables all outputs when VCC = 0V, preventing backdrive during partial power-down.
It supports mixed-mode signal operation: inputs tolerate up to 5.5V regardless of VCC (2.7–3.6V), enabling direct connection to 5V buses while powered from 3.3V. Output drive strength is symmetric (±24mA at 3V), with fast edge rates requiring careful PCB layout to suppress ringing on traces >12 cm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - defines valid supply window; operation outside causes functional failure or damage. |
| Input Voltage Tolerance | 0V to 5.5V - allows direct interface with 5V TTL/CMOS without level shifters. |
| Max Propagation Delay | 6.5ns at VCC = 3.3V - ensures timing compliance in 150+ MHz bus applications with tight setup/hold margins. |
| Output Drive Strength | ±24mA at VCC = 3V - supports driving 50pF loads or parallel termination resistors without signal degradation. |
| Ioff Current | ±5μA at VI/VO = 5.5V - prevents current leakage during hot-swap or partial power-down sequences. |
| Ground Bounce (VOLP) | <0.8V at VCC = 3.3V - reduces noise coupling into adjacent signals during simultaneous switching. |
| VOH Undershoot (VOHV) | >2V at VCC = 3.3V - maintains noise margin during fast low-to-high transitions on shared buses. |
Pinout & Package
DW package: SOIC-20, 12.80mm × 10.3mm body size, 12.8mm × 7.5mm footprint including leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Active-low output enable (Bank 1 & Bank 2) | Controls 4-channel output state per bank; high = high-impedance, low = enabled inversion. |
| 1A1–1A4, 2A1–2A4 | Input channels (Bank 1 & Bank 2) | Accept 5.5V-tolerant logic signals; Schmitt-trigger inputs reject noise on slow-rising edges. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs (Bank 1 & Bank 2) | Deliver rail-to-rail CMOS output swing; support bus contention avoidance via independent 3-state control. |
| 10GND, 20VCC | Power terminals | Single-supply operation; requires local 0.1μF bypass capacitor at VCC pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Power-up 3-state | Outputs remain high-impedance until VCC stabilizes - eliminates bus contention during power sequencing. |
| Mixed-mode voltage operation | 5.5V-tolerant inputs + 3.3V VCC enables seamless 3.3V/5V domain bridging without external translators. |
| Balanced CMOS outputs | Symmetric ±24mA drive capability ensures matched rise/fall times and reduced EMI on bidirectional buses. |
| Low ground bounce & VOH undershoot | VOLP <0.8V and VOHV >2V minimize signal integrity degradation in high-speed multi-drop environments. |
| JESD78 latch-up immunity | >100mA latch-up rating - withstands transient overcurrent events in industrial or automotive power domains. |
Applications
| Industrial Bus Interface | Hot-Swappable Module Control |
|---|---|
|
Use Scenario: Interfacing a 3.3V microcontroller to legacy 5V RS-485 transceivers or sensor hubs on a shared data bus. IC Role / Device Role / Timing Role: Level-translating octal buffer providing direction-controlled signal isolation and bus arbitration via dual OE pins. Use Value: Eliminates need for discrete level shifters; 5.5V input tolerance and 3.3V-compatible outputs reduce BOM count and layout area. |
Use Scenario: Enabling/disabling peripheral modules (e.g., CAN, ADC, or display drivers) in field-replaceable slots without powering down the main system. IC Role / Device Role / Timing Role: Hot-insertion-safe buffer isolating module I/O lines during insertion/removal using Ioff and power-up 3-state behavior. Use Value: Prevents backdrive currents and bus contention during live module swaps - critical for telecom and server backplane reliability. |
| LED Driver Interface | Signal Integrity Optimized Trace Driver |
|
Use Scenario: Driving multiple indicator LEDs from a low-current GPIO port, where sink/source capability exceeds MCU limits. IC Role / Device Role / Timing Role: High-drive inverting buffer sourcing/sinking up to 24mA per channel to directly illuminate LEDs with series resistors. Use Value: Replaces transistor arrays; built-in 3-state allows dynamic LED group enabling/disabling without software overhead. |
Use Scenario: Driving long PCB traces (>12 cm) to remote FPGAs or memory controllers where impedance mismatch causes ringing. IC Role / Device Role / Timing Role: Low-propagation-delay buffer with controlled edge rates, used with series damping resistors for clean signal transmission. Use Value: 6.5ns tpd and balanced drive enable reliable 100+ Mbps signaling; layout guidelines in datasheet ensure SI compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer with 3-state applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240ADW | Lacks Z-series features: no power-up 3-state, no Ioff, no 5.5V input tolerance (max VI = VCC + 0.5V). | Not suitable for hot-swap or mixed-voltage domains; requires strict 3.3V-only I/O environment. | Select only if cost sensitivity outweighs robustness requirements and system guarantees clean power sequencing. |
| 74LVT240DW | Higher VCC range (2.7–3.6V same), but TTL-input thresholds (VIH = 2.0V min), no 5.5V tolerance, higher ICC. | Compatible only with TTL-output sources; unsuitable for 5V CMOS or open-drain pull-up interfaces. | Choose only when interfacing legacy TTL logic and ground bounce/VOHV specs are non-critical. |
Compared with SN74LVCZ240ADW, SN74LVC240ADW omits critical hot-swap protections and voltage flexibility, while 74LVT240DW sacrifices 5.5V tolerance and noise immunity - making SN74LVCZ240ADW the sole choice for mixed-voltage, field-serviceable, or noise-sensitive designs.
Availability
SN74LVCZ240ADW is available at Aetrix Electronics and suitable for industrial bus interface, hot-swappable module control, LED driver interface, signal integrity optimized trace driver, and mixed-voltage logic translation requiring stable component supply across production lifecycles.
Supply support for SN74LVCZ240ADW 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 for industrial, automotive, and communications markets.
The SN74LVCZ240ADW belongs to TI's LVCZ advanced logic family, designed specifically for robust mixed-voltage interfacing, hot-plug resilience, and high-speed signal integrity in space-constrained industrial systems.
FAQ
What is the function of the OE pins on the SN74LVCZ240ADW?
The SN74LVCZ240ADW has two active-low output enable pins: 1OE (Pin 1) controls Bank 1 outputs (1Y1–1Y4), and 2OE (Pin 19) controls Bank 2 outputs (2Y1–2Y4). When an OE pin is low, its corresponding bank's outputs are enabled and perform inverting buffering; when high, those outputs enter high-impedance state. This enables independent bus arbitration and power-gating per channel group in the SN74LVCZ240ADW.
Does the SN74LVCZ240ADW support 5V inputs while powered from 3.3V?
Yes, the SN74LVCZ240ADW supports input voltages up to 5.5V regardless of VCC (2.7–3.6V), enabling direct connection to 5V logic without external level shifters. This mixed-mode operation is confirmed in the Recommended Operating Conditions table and is a defining feature of the SN74LVCZ240ADW's Z-series architecture.
What is the maximum capacitive load the SN74LVCZ240ADW can drive while maintaining datasheet timing?
The SN74LVCZ240ADW is specified to drive loads ≤50pF while meeting all switching characteristics, including tpd ≤6.5ns at 3.3V. Exceeding 50pF increases propagation delay and may cause signal integrity issues such as overshoot or ringing - especially on traces >12 cm. Layout best practices (e.g., series damping resistors) are recommended for heavier loads in the SN74LVCZ240ADW design.
How does the SN74LVCZ240ADW handle power-up sequencing?
The SN74LVCZ240ADW incorporates power-up 3-state logic that holds all outputs in high-impedance until VCC reaches a valid operating level (~2.7V), preventing bus contention during ramp-up. This behavior is intrinsic to the Z-series design and does not require external circuitry - a key differentiator from standard LVC buffers like SN74LVC240ADW in the SN74LVCZ240ADW family.
Is the SN74LVCZ240ADW pin-compatible with SN74LVC240ADW?
Yes, the SN74LVCZ240ADW is pin-compatible with SN74LVC240ADW in the DW (SOIC-20) package - identical pin count, numbering, and function mapping. However, SN74LVCZ240ADW adds Z-series enhancements (Ioff, power-up 3-state, 5.5V input tolerance) not present in SN74LVC240ADW, making it a functional superset with no PCB changes required.
SN74LVCZ240ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCZ
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVCZ240ADW FAQ
1.How can I place an order for SN74LVCZ240ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCZ240ADW 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 SN74LVCZ240ADW reliable?
The price and inventory of SN74LVCZ240ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCZ240ADW is usually 5 days.
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4.How is shipping managed for SN74LVCZ240ADW?
SN74LVCZ240ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCZ240ADW 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 SN74LVCZ240ADW?
For technical support, including SN74LVCZ240ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCZ240ADW requirements.
6.How does Aetrix verify that SN74LVCZ240ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVCZ240ADW 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 SN74LVCZ240ADW meets industry standards.
7.What is the process for return or replacement of SN74LVCZ240ADW?
All SN74LVCZ240ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCZ240ADW, 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 SN74LVCZ240ADW part is unused and in its original packaging.
Return procedure for SN74LVCZ240ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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