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onsemi 74VCXH16244DTR
- Part No.:
- 74VCXH16244DTR
- Manufacturer:
- onsemi
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- -
- Datasheet:
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74VCXH16244DTR.pdf
- Description:
- BUS DRIVER, ALVC/VCX/A SERIES
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Product details
Overview
74VCXH16244DTR from ON Semiconductor is a low-voltage, 16-bit non-inverting buffer IC with four independent nibble controls (OE1–OE4), 3.6 V-tolerant I/O, and operation down to 1.65 V supply. It delivers ±24 mA drive at 3.0 V, achieves 2.5 ns max propagation delay at 3.0–3.6 V, and integrates active bushold circuitry to eliminate external pullups-used in voltage-level translation between 1.8/2.5/3.3 V domains in FPGA I/O expansion and memory interface subsystems.
For engineers reviewing the 74VCXH16244DTR datasheet, pinout, applications, or equivalent options, key selection criteria include its 48-pin TSSOP package, 3-state output enable per nibble, IOFF protection at VCC = 0 V, sub-20 µA quiescent ICC, and verified 3.6 V tolerance on all I/O pins under mixed-supply system interfacing.
Technical Context
The 74VCXH16244DTR implements four independent 4-bit buffers, each controlled by dedicated OE inputs (OE1–OE4), enabling selective 3-state activation per nibble without affecting other sections. Its bushold circuitry maintains valid logic states on floating inputs using internal feedback, eliminating external biasing components.
It supports live insertion and withdrawal via IOFF specification, guaranteeing high-impedance outputs when VCC = 0 V. AC performance is characterized across three VCC ranges: 1.65–1.95 V (6.0 ns max tPLH/tPHL), 2.3–2.7 V (3.0 ns), and 3.0–3.6 V (2.5 ns), with skew ≤0.75 ns between any two outputs switching in the same direction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V - enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains |
| Input/Output Voltage Tolerance | Up to 3.6 V - allows safe interfacing to higher-voltage busses without level shifters |
| Propagation Delay (VCC = 3.0–3.6 V) | 2.5 ns max - supports >300 MHz data rates in high-speed bus applications |
| Output Drive Strength | ±24 mA at 3.0 V - drives heavy capacitive loads or multiple CMOS inputs directly |
| Quiescent Supply Current | 20 µA max - minimizes standby power in battery-backed or energy-sensitive systems |
| IOFF Leakage (VCC = 0 V) | 10 µA max - ensures true high-impedance isolation during hot-swap or power-down sequences |
| Bushold Input Current | ±75 µA at VCC = 3.0 V - actively holds unused inputs at valid logic levels without external resistors |
Pinout & Package
74VCXH16244DTR is housed in a Pb-free 48-pin Thin Shrink Small Outline Package (TSSOP), case 1201, with 0.5 mm lead pitch and body dimensions 12.5 mm × 6.1 mm × 1.2 mm (L × W × H). Pin 1 is marked by a dot or beveled corner; pins are numbered counter-clockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1–OE4 | Nibble Output Enable Inputs | Active-low control per 4-bit group; tying together enables full 16-bit operation |
| D0–D15 | Data Inputs | 16-bit parallel input bus; each accepts 1.65–3.6 V logic with bushold |
| O0–O15 | 3-State Outputs | Non-inverting buffered outputs; high-impedance when corresponding OE is HIGH |
| VCC (Pins 7, 21, 30, 42) | Power Supply | Four distributed VCC pins reduce IR drop and improve noise immunity |
| GND (Pins 5, 10, 15, 28, 34, 45) | Ground | Six GND pins provide low-inductance return paths for high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| 3.6 V-tolerant I/O | Enables direct connection to 3.3 V busses while operating from 1.8 V or 2.5 V supplies - no external level translators required |
| Active bushold circuitry | Eliminates need for 10 kΩ pullup/pulldown resistors on unused inputs - reduces BOM count and board space |
| IOFF protection | Guarantees high-impedance outputs even when VCC = 0 V - essential for hot-plug and partial-power-down systems |
| Low dynamic noise | VOLP ≤ 0.8 V and VOHV ≥ 2.2 V at 3.3 V (CL = 30 pF) - maintains signal integrity during simultaneous switching |
| Output-to-output skew | ≤ 0.75 ns - ensures deterministic timing alignment across all 16 outputs in synchronous bus designs |
Applications
| FPGA I/O Expansion | Memory Interface Buffering |
|---|---|
Use Scenario: Expanding limited I/O count of Xilinx Artix-7 FPGA to drive 16-bit parallel SRAM and peripheral control lines. IC Role / Device Role / Timing Role: Non-inverting 16-bit buffer with per-nibble 3-state control, translating 1.8 V FPGA outputs to 3.3 V memory address/data busses. Use Value: 3.6 V-tolerant I/O eliminates discrete level shifters; bushold prevents floating inputs during configuration; 2.5 ns delay supports 200+ MHz SRAM access cycles. |
Use Scenario: Isolating and driving DDR2 SDRAM command/address bus from a 2.5 V SoC controller in industrial PLC mainboard. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer providing clean, synchronized CA signals with independent nibble gating for power management. Use Value: ±24 mA drive sustains signal integrity over 8 cm PCB traces; IOFF enables safe memory hot-swap; 0.75 ns skew meets DDR2 tAC setup window. |
| Hot-Swappable Backplane Interface | Low-Power Sensor Hub Aggregation |
Use Scenario: Interfacing modular I/O cards to a 3.3 V backplane in telecom shelf management, requiring live insertion capability. IC Role / Device Role / Timing Role: Voltage-translating buffer with IOFF-enabled 3-state outputs, allowing card removal while backplane remains powered. Use Value: IOFF leakage <10 µA at VCC = 0 V prevents backplane loading; 3.6 V tolerance protects against bus overshoot during mating; TSSOP footprint fits dense connector zones. |
Use Scenario: Aggregating 16 analog sensor outputs (via ADCs) into a 1.8 V microcontroller's GPIO port in portable environmental monitor. IC Role / Device Role / Timing Role: Low-quiescent-current (20 µA) buffer isolating noisy sensor domain from sensitive MCU domain, with bushold on unconnected channels. Use Value: 20 µA ICC extends battery life; bushold holds open ADC channel selects at valid logic; 1.65 V min VCC supports ultra-low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16244ADGGR | Lower drive (±24 mA only at 3.3 V); no bushold; 1.65–3.6 V range; 48-pin TSSOP | Lacks bushold - requires external pullups on unused inputs; no IOFF spec | Choose when bushold and hot-swap are not required and cost is primary constraint |
| 74ALVC16244PW | Higher speed (2.1 ns @ 3.3 V); same VCC range; no bushold; 48-pin TSSOP; lower ICC (10 µA) | No IOFF or bushold; less robust for mixed-voltage hot-swap scenarios | Prefer for pure high-speed digital interconnect where power is critical and inputs are always driven |
Compared with SN74LVC16244ADGGR and 74ALVC16244PW, the 74VCXH16244DTR uniquely combines bushold, IOFF, and 3.6 V tolerance - making it the only option among the three qualified for live-insertion systems with undriven inputs and multi-rail voltage translation.
Availability
74VCXH16244DTR is available at Aetrix Electronics and suitable for FPGA I/O expansion, memory interface buffering, hot-swappable backplane interface, low-power sensor hub aggregation, and industrial control bus isolation requiring stable component supply and long-term lifecycle support.
Supply support for 74VCXH16244DTR 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 74VCXH16244DTR belongs to the VCXH family of advanced low-voltage logic devices, designed specifically for mixed-supply system interfacing, voltage translation, and high-reliability hot-swap applications in industrial and communications infrastructure.
FAQ
What is the maximum supply voltage for the 74VCXH16244DTR?
The 74VCXH16244DTR supports a recommended operating supply voltage up to 3.6 V DC. Absolute maximum VCC is +4.6 V, but sustained operation above 3.6 V violates specifications and risks reliability. The device is explicitly rated for 1.65 V to 3.6 V operation, with guaranteed 3.6 V-tolerant I/O regardless of VCC setting - critical for interfacing with 3.3 V busses while running at 1.8 V or 2.5 V.
Does the 74VCXH16244DTR require external pullup resistors on unused inputs?
No, the 74VCXH16244DTR does not require external pullup resistors on unused inputs due to its integrated active bushold circuitry. This feature sources or sinks current (±75 µA typical at 3.0 V) to hold floating inputs at valid logic thresholds. External resistors are unnecessary unless specific noise immunity requirements exceed bushold's capability - confirmed in the datasheet's "Features" and DC Electrical Characteristics tables.
Can the 74VCXH16244DTR be used in hot-swap applications?
Yes, the 74VCXH16244DTR supports live insertion and withdrawal per its IOFF specification: when VCC = 0 V, output leakage is limited to 10 µA max, ensuring true high-impedance isolation. This, combined with 3.6 V-tolerant I/O, allows safe connection/disconnection to an active 3.3 V backplane without damaging the device or disturbing system operation - explicitly stated in the Features section and Absolute Maximum Ratings table.
What is the propagation delay of the 74VCXH16244DTR at 2.5 V supply?
At VCC = 2.3 V to 2.7 V, the 74VCXH16244DTR has a maximum propagation delay (tPLH/tPHL) of 3.0 ns under standard test conditions (CL = 30 pF, RL = 500 Ω, tR/tF = 2.0 ns). This value is measured from input transition (10% to 90%) to output transition and applies across all 16 channels - specified in the AC Characteristics table on page 5 of the datasheet.
How many independent output-enable controls does the 74VCXH16244DTR have?
The 74VCXH16244DTR has four independent output-enable inputs: OE1, OE2, OE3, and OE4 - one for each 4-bit nibble (D0–D3/O0–O3, D4–D7/O4–O7, etc.). Each OE pin is active-low; asserting it LOW enables the corresponding 4-bit outputs, while HIGH places them in high-impedance state. This nibble-level control is fundamental to its architecture and shown in Figures 1, 2, and the Truth Table.
74VCXH16244DTR Specifications
- Product attributes
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- Manufacturer:
- onsemi
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74VCXH16244DTR FAQ
1.How can I place an order for 74VCXH16244DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VCXH16244DTR 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 74VCXH16244DTR reliable?
The price and inventory of 74VCXH16244DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH16244DTR is usually 5 days.
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Once your 74VCXH16244DTR 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 74VCXH16244DTR?
For technical support, including 74VCXH16244DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH16244DTR requirements.
6.How does Aetrix verify that 74VCXH16244DTR is sourced from the original manufacturer or authorized distributors?
All 74VCXH16244DTR 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 74VCXH16244DTR meets industry standards.
7.What is the process for return or replacement of 74VCXH16244DTR?
All 74VCXH16244DTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH16244DTR, 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 74VCXH16244DTR part is unused and in its original packaging.
Return procedure for 74VCXH16244DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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