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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74VCXH16244DT

Name: 74VCXH16244DT
Brand: onsemi
SKU: 74VCXH16244DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCXH16244DT

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 74VCXH16244DT.pdf

Description:: BUS DRIVER, ALVC/VCX/A SERIES

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Product details

Overview

74VCXH16244DT from ON Semiconductor is a low-voltage, 16-bit non-inverting buffer with 3-state outputs, designed for 1.65 V to 3.6 V operation and 3.6 V-tolerant I/O. It features nibble-level control (four independent OE inputs), active bushold on all inputs, and ±24 mA drive at 3.0 V. Used in voltage-level translation between 1.8/2.5/3.3 V domains in high-speed memory and bus interface circuits.

For engineers reviewing the 74VCXH16244DT datasheet, pinout, applications, or equivalent options, key selection criteria include 3.6 V I/O tolerance, propagation delay down to 2.5 ns (VCC = 3.0–3.6 V), static drive strength across supply voltages, bushold input retention, and TSSOP-48 package compatibility with space-constrained board layouts.

Technical Context

The 74VCXH16244DT implements four independent 4-bit buffers, each controlled by its own Output Enable (OE1–OE4) signal. Each nibble operates identically but electrically isolated, enabling flexible partitioning of data paths without cross-talk.

Its bushold circuitry actively maintains valid logic states on unused or floating inputs without external pull-ups, while the IOFF specification ensures high-impedance outputs when VCC = 0 V-critical for live insertion and hot-swap applications. Propagation delays are guaranteed across three voltage bands: ≤2.5 ns (3.0–3.6 V), ≤3.0 ns (2.3–2.7 V), and ≤6.0 ns (1.65–1.95 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.65 V to 3.6 V - supports mixed-voltage system interfacing with single-supply flexibility
Input/Output Tolerance	3.6 V - enables safe connection to 3.3 V busses while operating at 1.8 V or 2.5 V
Max Propagation Delay	2.5 ns @ VCC = 3.0–3.6 V - meets timing requirements for high-speed address/data buffering
Output Drive Strength	±24 mA @ 3.0 V - sufficient to drive multiple CMOS loads or moderate PCB trace capacitance
Bushold Input Current	±75 µA @ VCC = 3.0 V - actively holds floating inputs without external components
Quiescent Supply Current	20 µA - minimizes standby power in battery-sensitive or always-on subsystems
IOFF Leakage	10 µA @ VCC = 0 V - guarantees true high-Z output during power-down or hot-plug events

Pinout & Package

TSSOP-48 package (Case 1201), Pb-free, 0.5 mm pitch, 12.5 mm × 6.1 mm footprint, 1.0 mm max height. Pin 1 marked with dot; pins numbered counter-clockwise from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
OE1–OE4 (Pins 1, 47, 25, 24)	Output Enable Inputs	Active-low controls for four independent 4-bit nibbles; tied together for full 16-bit operation
D0–D15 (Pins 46, 44–43, 41–40, 38–37, 36–35, 33–32, 30–29, 27–26)	Data Inputs	16 dedicated inputs with bushold - eliminate need for external pull-up/pull-down resistors
O0–O15 (Pins 2, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23)	3-State Outputs	Non-inverting buffered outputs; high-impedance when corresponding OE is HIGH
VCC (Pins 7, 42, 18, 31)	Power Supply	Four distributed VCC pins reduce supply noise and improve decoupling effectiveness
GND (Pins 45, 39, 34, 15, 21)	Ground	Five GND pins minimize ground bounce and support stable high-speed switching

Key Features

Feature	Design Value
3.6 V tolerant I/O	Enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters
Active bushold inputs	Eliminates external biasing components for unused inputs, reducing BOM count and layout area
IOFF protection	Prevents back-powering and signal contention during power sequencing or hot-swap operations
Nibble-selectable 3-state control	Allows partial bus isolation-e.g., disable only upper byte while lower byte remains active
Low dynamic noise	VOLP/VOLV specs (e.g., ±0.8 V @ 3.3 V) ensure clean signal integrity under simultaneous switching conditions

Applications

Memory Interface Buffering	Low-Power Bus Transceiver
Use Scenario: Interfacing a 1.8 V microcontroller to a 3.3 V SRAM or Flash memory device with shared address/data bus. IC Role / Device Role / Timing Role: Non-inverting 16-bit buffer providing level translation and drive strength amplification while maintaining setup/hold timing margins. Use Value: Eliminates discrete level shifters; 2.5 ns propagation delay preserves timing budget in 100+ MHz memory access cycles.	Use Scenario: Isolating two voltage domains on a shared peripheral bus (e.g., I²C-compatible control bus with mixed 2.5 V sensors and 3.3 V host). IC Role / Device Role / Timing Role: Bidirectional buffer with independent nibble enables selective domain gating and reduces cross-domain noise coupling. Use Value: Bushold prevents floating states during bus arbitration; 3.6 V tolerance avoids damage from transient overvoltage during hot-plug events.
Hot-Swappable Module Interface	Low-Voltage FPGA I/O Expansion
Use Scenario: Backplane interface for field-replaceable modules where main system operates at 2.5 V and add-on cards run at 3.3 V. IC Role / Device Role / Timing Role: Voltage-tolerant buffer with IOFF ensures safe insertion/removal without disrupting powered system rails. Use Value: IOFF leakage <10 µA at VCC = 0 V prevents backfeeding; OE-controlled nibbles allow staged initialization sequences.	Use Scenario: Expanding I/O count of a 1.65–1.95 V FPGA bank driving legacy 3.3 V peripherals like displays or ADCs. IC Role / Device Role / Timing Role: Level-shifting buffer delivering ±6 mA drive at 1.65 V while accepting 3.6 V inputs directly. Use Value: 6.0 ns max propagation delay meets FPGA-to-peripheral timing constraints; bushold secures unassigned FPGA pins during configuration.

Memory Interface Buffering

Low-Power Bus Transceiver

Use Scenario: Interfacing a 1.8 V microcontroller to a 3.3 V SRAM or Flash memory device with shared address/data bus.

IC Role / Device Role / Timing Role: Non-inverting 16-bit buffer providing level translation and drive strength amplification while maintaining setup/hold timing margins.

Use Value: Eliminates discrete level shifters; 2.5 ns propagation delay preserves timing budget in 100+ MHz memory access cycles.

Use Scenario: Isolating two voltage domains on a shared peripheral bus (e.g., I²C-compatible control bus with mixed 2.5 V sensors and 3.3 V host).

IC Role / Device Role / Timing Role: Bidirectional buffer with independent nibble enables selective domain gating and reduces cross-domain noise coupling.

Use Value: Bushold prevents floating states during bus arbitration; 3.6 V tolerance avoids damage from transient overvoltage during hot-plug events.

Hot-Swappable Module Interface

Low-Voltage FPGA I/O Expansion

Use Scenario: Backplane interface for field-replaceable modules where main system operates at 2.5 V and add-on cards run at 3.3 V.

IC Role / Device Role / Timing Role: Voltage-tolerant buffer with IOFF ensures safe insertion/removal without disrupting powered system rails.

Use Value: IOFF leakage <10 µA at VCC = 0 V prevents backfeeding; OE-controlled nibbles allow staged initialization sequences.

Use Scenario: Expanding I/O count of a 1.65–1.95 V FPGA bank driving legacy 3.3 V peripherals like displays or ADCs.

IC Role / Device Role / Timing Role: Level-shifting buffer delivering ±6 mA drive at 1.65 V while accepting 3.6 V inputs directly.

Use Value: 6.0 ns max propagation delay meets FPGA-to-peripheral timing constraints; bushold secures unassigned FPGA pins during configuration.

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 I/O tolerance (3.6 V not guaranteed); no bushold; 1.65–3.6 V supply	Lacks active input retention and robust 3.6 V tolerance-requires external pull-ups and careful voltage margining	Choose if bushold and strict 3.6 V tolerance are unnecessary and cost is primary driver
74ALVC16244PW	Higher speed (2.1 ns @ 3.3 V), same 3.6 V tolerance, no bushold, 1.65–3.6 V supply	Superior timing performance but requires external biasing for unused inputs; higher ICC in active state	Choose when sub-2.5 ns propagation is mandatory and bushold is not required

Compared with SN74LVC16244ADGGR and 74ALVC16244PW, the 74VCXH16244DT uniquely combines guaranteed 3.6 V I/O tolerance, integrated bushold, and IOFF protection-making it the only option among the three qualified for live-insertion systems with mixed-voltage buses and uncontrolled input states.

Availability

74VCXH16244DT is available at Aetrix Electronics and suitable for memory interface buffering, low-power bus transceivers, hot-swappable module interfaces, and low-voltage FPGA I/O expansion requiring stable component supply across industrial temperature range (−40°C to +85°C).

Supply support for 74VCXH16244DT 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 onsemi) is a global semiconductor supplier focused on energy-efficient electronics, delivering power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The 74VCXH16244DT belongs to the VCXH ultra-low-voltage logic family, engineered specifically for high-speed, low-power voltage translation in portable and mixed-supply systems where reliability under dynamic voltage conditions is critical.

FAQ

What is the maximum operating voltage for 74VCXH16244DT inputs and outputs?

The 74VCXH16244DT guarantees 3.6 V tolerance on all inputs and outputs regardless of VCC level-enabling direct connection to 3.3 V busses even when powered at 1.8 V or 2.5 V. This is verified per Absolute Maximum Ratings (VI and VO up to +4.6 V) and Recommended Operating Conditions (VI/VO up to 3.6 V), with functional operation confirmed across the full 1.65–3.6 V supply range. The 74VCXH16244DT maintains this tolerance without external clamping or level-shifting circuitry.

Does 74VCXH16244DT require external pull-up resistors on unused inputs?

No. The 74VCXH16244DT integrates active bushold circuitry on all 16 data inputs (D0–D15), which provides sufficient current (±75 µA at VCC = 3.0 V) to maintain valid logic states on floating or unconnected inputs. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB real estate. The bushold behavior is specified across all supported VCC levels and is validated in DC Electrical Characteristics tables.

Can 74VCXH16244DT be used in hot-swap applications where VCC may be powered down while signals remain active?

Yes. The 74VCXH16244DT includes an IOFF specification that guarantees high-impedance outputs and limits power-off leakage current to 10 µA when VCC = 0 V and inputs/outputs are biased to 3.6 V. This prevents back-powering of the supply rail and signal contention during live insertion or removal-key for backplane and modular system designs. The feature is explicitly tested and guaranteed per datasheet Section 3 (Absolute Maximum Ratings) and Section 4 (DC Electrical Characteristics).

What is the propagation delay of 74VCXH16244DT at 2.5 V supply?

At VCC = 2.3 V to 2.7 V, the 74VCXH16244DT 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 to all 16 channels. The delay is consistent across nibbles and unaffected by OE state when outputs are enabled. The 74VCXH16244DT datasheet specifies this parameter in Table 5 (AC Characteristics) and confirms it across −40°C to +85°C.

How many output enable (OE) inputs does 74VCXH16244DT have, and how are they assigned?

The 74VCXH16244DT has four independent output enable inputs: OE1 (Pin 1), OE2 (Pin 47), OE3 (Pin 25), and OE4 (Pin 24). Each controls a 4-bit nibble-OE1 for D0–D3/O0–O3, OE2 for D4–D7/O4–O7, OE3 for D8–D11/O8–O11, and OE4 for D12–D15/O12–O15. All OEn pins are active-low; tying them together enables full 16-bit operation. Pin assignments and logic diagram are confirmed in Figures 1–3 and Table 1 of the official datasheet.

74VCXH16244DT Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

74VCXH16244DT FAQ

1.How can I place an order for 74VCXH16244DT through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCXH16244DT 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 74VCXH16244DT reliable?

The price and inventory of 74VCXH16244DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH16244DT is usually 5 days.

3.What payment methods are accepted for 74VCXH16244DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH16244DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCXH16244DT?

74VCXH16244DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCXH16244DT 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 74VCXH16244DT?

For technical support, including 74VCXH16244DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH16244DT requirements.

6.How does Aetrix verify that 74VCXH16244DT is sourced from the original manufacturer or authorized distributors?

All 74VCXH16244DT 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 74VCXH16244DT meets industry standards.

7.What is the process for return or replacement of 74VCXH16244DT?

All 74VCXH16244DT units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH16244DT, 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 74VCXH16244DT part is unused and in its original packaging.

Return procedure for 74VCXH16244DT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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