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onsemi 74VCX16240MTD
- Part No.:
- 74VCX16240MTD
- Manufacturer:
- onsemi
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74VCX16240MTD.pdf
- Description:
- IC BUFFER INVERT 3.6V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,721
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Product details
Overview
74VCX16240MTD from Fairchild Semiconductor is a low-voltage 16-bit inverting buffer/line driver with 3.6V-tolerant I/O, designed for memory/address bus driving and clock distribution in 1.2V–3.6V systems. It features nibble-wise 3-STATE control (four independent OE inputs), 2.5 ns max propagation delay at 3.3V, ±24 mA drive strength, and power-off high-impedance I/O - enabling hot-swap compatibility in backplane and modular computing applications.
For engineers reviewing the 74VCX16240MTD datasheet, pinout, applications, or equivalent options, key selection criteria include VCC operating range (1.2–3.6V), 3.6V I/O tolerance across all supply voltages, per-nibble 3-STATE enable architecture, sub-3 ns AC timing at 3.3V, and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
The 74VCX16240MTD implements sixteen independent inverting buffers grouped into four 4-bit nibbles, each with dedicated active-low Output Enable (OEn) control. This enables selective 4-bit bus isolation without affecting other data lanes - critical for partial-bus arbitration in multi-master memory subsystems.
Its advanced CMOS process delivers rail-to-rail output swing (0V to VCC) under load while maintaining 20 µA quiescent ICC and supporting live insertion via power-off high-Z I/O states. Input thresholds scale with VCC (VIH = 0.65×VCC min at 1.2V), ensuring robust noise margins across the full supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.2V to 3.6V - supports mixed-voltage system interfacing (e.g., 1.8V core logic driving 3.3V peripherals) |
| tPD (max) | 2.5 ns at VCC = 3.3V, CL = 30 pF - enables >300 MHz bus operation in high-speed address/data paths |
| I/O Voltage Tolerance | 3.6V tolerant inputs and outputs - allows safe connection to 3.3V buses even when VCC = 1.2V |
| IOH/IOL Drive | ±24 mA at VCC = 3.0–3.6V - drives 50 Ω transmission lines or multiple CMOS loads without external buffering |
| Power-Off Behavior | High-impedance I/O when VCC = 0V - prevents back-driving and enables hot-plug capability in modular systems |
| Input Leakage (II) | ≤5.0 µA at 1.2–3.6V - minimizes standby current in battery-backed or ultra-low-power hold modes |
| 3-STATE Leakage (IOZ) | ≤10 µA at VO = 0–3.6V - ensures clean bus release and avoids false logic states during disable |
Pinout & Package
74VCX16240MTD is housed in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch. The package supports fine-pitch surface-mount assembly and thermal performance suitable for industrial ambient temperatures (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEn (OE1–OE4) | Active-low 3-STATE enable per nibble | Four independent controls allow selective 4-bit bus isolation (e.g., OE1 for I0–I3/O0–O3) |
| I0–I15 | Inverting input terminals | 16 buffered inputs accepting 3.6V-tolerant signals regardless of VCC level |
| O0–O15 | Inverting 3-STATE outputs | Outputs mirror inverted inputs when corresponding OEn = LOW; high-Z when OEn = HIGH |
| VCC | Positive supply | Single 1.2–3.6V supply powers all logic and I/O; no separate I/O voltage rail required |
| GND | Ground reference | Common return for supply and signal integrity; decoupling recommended per JEDEC MO-153 layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Nibble-selectable 3-STATE control | Four independent OE pins enable granular 4-bit bus partitioning - reduces contention in shared-memory architectures |
| 3.6V-tolerant I/O at any VCC | Eliminates level-shifter requirements when interfacing 1.2V/1.8V logic to legacy 3.3V buses or peripherals |
| Live-insertion support | Power-off high-Z I/O prevents back-powering and signal corruption during hot-swap events in modular chassis |
| Low-noise switching | Patented EMI reduction circuitry limits simultaneous switching noise - improves signal integrity in dense routing |
| High latch-up immunity | >300 mA latch-up rating per JEDEC JESD78 - ensures robustness in noisy industrial environments |
Applications
| Memory Interface Driver | Backplane Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address/data lines between low-voltage SoC and DDR SDRAM or Flash memory with 3.3V I/O tolerance. IC Role / Device Role / Timing Role: Inverting buffer with per-nibble 3-STATE control acts as bidirectional address latch and bus isolator. Use Value: Enables direct interface to 3.3V memory without level shifters while maintaining sub-3 ns timing margin at 3.3V VCC. |
Use Scenario: Isolating hot-swappable line cards on a 16-bit parallel backplane operating at 3.3V logic levels. IC Role / Device Role / Timing Role: Line driver providing controlled bus access and power-off high-Z behavior during card insertion/removal. Use Value: Prevents bus contention and back-driving during live insertion, supported by 3.6V-tolerant I/O and zero-VCC high-Z state. |
| Clock Distribution Buffer | Modular Computing Address Arbiter |
Use Scenario: Distributing inverted clock or strobe signals across multiple FPGA or ASIC clock domains with matched skew. IC Role / Device Role / Timing Role: Low-skew inverting buffer (tOSHL/tOSLH ≤ 0.75 ns) delivering synchronized timing edges. Use Value: Sub-nanosecond output-to-output skew ensures deterministic setup/hold timing across distributed clock loads. |
Use Scenario: Arbitrating access to shared peripheral buses (e.g., UART, SPI controllers) among multiple low-voltage processors. IC Role / Device Role / Timing Role: Nibble-controlled buffer enabling dynamic 4-bit segment enable/disable for bus resource allocation. Use Value: Four independent OE inputs allow real-time reconfiguration of bus segments without global reset or timing disruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16240ADGGR | TI part uses LVC process; identical 16-bit inverting buffer function but only 3.6V-tolerant inputs (not outputs); tPD = 3.2 ns @ 3.3V | Lacks output tolerance - requires external clamping or level-shifting when driving 3.3V loads from 1.8V VCC | Select if cost-sensitive and system guarantees 3.3V loads are never driven directly from 74LVC16240 outputs |
| 74ALVC16240PW | NXP ALVC variant offers faster tPD (2.0 ns @ 3.3V) but narrower VCC range (1.65–3.6V); no power-off high-Z guarantee | Not suitable for hot-swap applications due to undefined I/O state at VCC = 0V | Prefer for speed-critical non-hot-swap designs where 1.2V operation is not required |
Compared with SN74LVC16240ADGGR and 74ALVC16240PW, the 74VCX16240MTD uniquely combines full 3.6V I/O tolerance, 1.2V minimum VCC, and guaranteed power-off high-Z - making it the only option qualified for mixed-voltage hot-swap backplanes requiring unconditional bus isolation.
Availability
74VCX16240MTD is available at Aetrix Electronics and suitable for memory interface drivers, backplane bus transceivers, and clock distribution circuits requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for 74VCX16240MTD 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 ICs, acquired by ON Semiconductor in 2016; its VCX logic family remains widely deployed in industrial and communications infrastructure.
The VCX series was engineered specifically for low-voltage, high-speed bus interface applications demanding 3.6V I/O tolerance, live-insertion capability, and sub-3 ns timing - targeting telecom line cards, modular servers, and programmable logic interconnects.
FAQ
What is the minimum VCC voltage supported by the 74VCX16240MTD?
The 74VCX16240MTD operates down to 1.2V VCC, with verified functionality including input thresholds scaling to 0.65×VCC, output drive down to ±100 nA at 1.2V, and 3.6V I/O tolerance maintained across the full range. This enables direct integration with ultra-low-power 1.2V cores without level translation.
Does the 74VCX16240MTD support hot-swap operation?
Yes - the 74VCX16240MTD supports live insertion and withdrawal per datasheet Note 1. Its power-off high-impedance inputs and outputs prevent back-driving when VCC = 0V, and the recommended pull-up on OE ensures defined high-Z state during power sequencing. This makes the 74VCX16240MTD suitable for modular chassis applications.
How many independent 3-STATE control inputs does the 74VCX16240MTD have?
The 74VCX16240MTD has four independent active-low Output Enable inputs (OE1–OE4), each controlling a 4-bit nibble (I0–I3/O0–O3, etc.). This architecture allows selective 4-bit bus isolation - for example, disabling only address bits A0–A3 while keeping A4–A15 active - a feature not found in standard 16-bit buffers.
What is the maximum propagation delay of the 74VCX16240MTD at 3.3V VCC?
The maximum propagation delay (tPHL/tPLH) of the 74VCX16240MTD is 2.5 ns at VCC = 3.3V ±0.3V, CL = 30 pF, and RL = 500 Ω. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) and enables reliable operation in 300+ MHz bus timing windows.
Is the 74VCX16240MTD pin-compatible with other 16-bit buffer families?
No - the 74VCX16240MTD uses a unique 48-pin TSSOP (MTD48) pinout with four OE inputs and dual-rail I/O grouping. It is not pin-compatible with SN74LVC16240ADGGR (48-TSSOP but different OE placement) or 74ALVC16240PW (same count but incompatible pin mapping). Board-level redesign is required for substitution.
74VCX16240MTD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VCX
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
74VCX16240MTD FAQ
1.How can I place an order for 74VCX16240MTD through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VCX16240MTD 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 74VCX16240MTD reliable?
The price and inventory of 74VCX16240MTD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX16240MTD is usually 5 days.
3.What payment methods are accepted for 74VCX16240MTD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX16240MTD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VCX16240MTD?
74VCX16240MTD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VCX16240MTD 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 74VCX16240MTD?
For technical support, including 74VCX16240MTD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX16240MTD requirements.
6.How does Aetrix verify that 74VCX16240MTD is sourced from the original manufacturer or authorized distributors?
All 74VCX16240MTD 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 74VCX16240MTD meets industry standards.
7.What is the process for return or replacement of 74VCX16240MTD?
All 74VCX16240MTD units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX16240MTD, 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 74VCX16240MTD part is unused and in its original packaging.
Return procedure for 74VCX16240MTD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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