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

STMicroelectronics 74VCX16240TTR

Name: 74VCX16240TTR
Brand: STMicroelectronics
SKU: 74VCX16240TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX16240TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: 74VCX16240TTR.pdf

Description:: IC BUFFER INVERT 3.6V 48TSSOP

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Product details

Overview

74VCX16240TTR from STMicroelectronics is a low-voltage CMOS 16-bit bus buffer (inverting, 3-state) with 3.6V-tolerant I/O, operating from 1.8V to 3.6V. It delivers t_PD = 2.5 ns (max) at 3.0–3.6V, ±24 mA output drive at V_CC = 3.0V, and symmetrical |I_OH| = I_OL, enabling high-speed memory address driving in mixed-voltage systems.

For engineers reviewing the 74VCX16240TTR datasheet, 74VCX16240TTR pinout, 74VCX16240TTR application, or 74VCX16240TTR equivalent, key selection criteria include 3.6V I/O tolerance across 1.8V–3.6V supply, 48-pin TSSOP package compatibility, propagation delay vs. voltage scaling, and 3-state enable logic for bus isolation in DDR memory subsystems.

Technical Context

This device implements eight independent 2-bit inverting buffers, each controlled by a dedicated active-low Output Enable (nG) input-pins 1, 24, 25, 48 govern four outputs each. All inputs and outputs feature ESD protection (>2 kV HBM), power-down leakage control (<10 µA), and latch-up immunity >300 mA per JESD17.

It operates as a voltage-level agnostic interface: inputs accept 0–3.6V signals regardless of V_CC, and outputs drive up to 3.6V even at V_CC = 1.8V. The 48-pin TSSOP package supports high-density PCB layouts while maintaining signal integrity via matched trace routing for grouped Y/A pins.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.8V to 3.6V - Enables direct interfacing between 1.8V logic and 3.6V legacy buses without level shifters.
t_PD (Max)	2.5 ns at V_CC = 3.0–3.6V - Supports >300 MHz bus toggle rates in memory address/data paths.
I_OH/I_OL	±24 mA at V_CC = 3.0V - Drives four 50Ω transmission lines simultaneously with <0.55V VOL under full load.
I/O Voltage Tolerance	0V to 3.6V - Allows hot-plug-safe connection to powered 3.3V/3.6V backplanes while V_CC is unpowered or at 1.8V.
C_IN/C_OUT	6 pF / 7 pF - Minimizes capacitive loading on high-speed address buses, reducing signal distortion and crosstalk.
Power-Down Leakage	<10 µA (I_off) - Prevents unintended current paths during system sleep modes or partial power-down states.

Pinout & Package

74VCX16240TTR uses a 48-pin Thin Shrink Small Outline Package (TSSOP), 12.4–12.6 mm × 8.1 mm body, 0.5 mm pitch, with exposed thermal pad not electrically connected. Pin 1 marked by bevelled corner.

Pin/Terminal	Circuit Role	Design Meaning
1, 24, 25, 48	nG (Output Enable)	Active-low control per 4-output group; enables high-impedance state when HIGH, critical for bus arbitration.
2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23	Y1–Y4 (Inverted Outputs)	Eight groups of four buffered, inverted outputs; each group shares one nG pin for synchronized 3-state control.
26–27, 29–30, 32–33, 35–36, 37–38, 40–41, 43–44, 46–47	A1–A4 (Inputs)	Corresponding non-inverted inputs feeding each Y-group; pin-mapped for direct trace routing to memory controller address lines.
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight ground pins distributed across package perimeter to minimize ground bounce and improve noise immunity.
7, 18, 31, 42	V_CC	Four dedicated V_CC pins placed adjacent to GND pairs to reduce supply impedance and decoupling loop area.

Key Features

Feature	Design Value
3.6V-tolerant I/O at 1.8V V_CC	Enables single-chip bridging between 1.8V SoCs and 3.3V peripherals without external level translators.
Symmetrical ±24 mA drive at 3.0V	Ensures matched rise/fall times and reduced timing skew across all 16 outputs under heavy capacitive loads.
Sub-3 ns propagation delay at 3.3V	Meets setup/hold timing margins for DDR1/DDR2 address strobes running at 133–200 MHz clock domains.
Integrated ESD protection (HBM >2 kV)	Eliminates need for discrete TVS diodes on board-level memory interfaces, reducing BOM count and layout area.
Low ICC (20 µA quiescent)	Reduces static power in always-on memory subsystems, supporting energy-efficient industrial controllers and IoT gateways.

Applications

Memory Address Buffering

Low-Voltage Bus Isolation

Use Scenario: Driving 16-bit address bus from a 1.8V FPGA to a 3.3V SDRAM module in an industrial PLC.

IC Role / Device Role / Timing Role: Inverting 3-state buffer providing voltage translation, bus contention prevention, and timing-critical address propagation.

Use Value: Eliminates external level shifters while meeting t_PD ≤ 2.5 ns and VOL ≤ 0.55V at 24 mA load-ensuring reliable SDRAM row/column addressing.

Use Scenario: Isolating two 2.5V processor cores sharing a common peripheral bus in automotive ADAS domain controller.

IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling controlled data exchange with precise enable timing and low inter-core crosstalk.

Use Value: 0.5 ns max output skew and 7 pF C_OUT maintain signal integrity across 100+ mm traces, preventing metastability in time-sensitive sensor fusion paths.

Hot-Swappable Backplane Interface

Legacy System Voltage Bridging

Use Scenario: Interfacing a 1.8V ASIC to a powered 3.6V telecom backplane during live insertion without damaging either side.

IC Role / Device Role / Timing Role: I/O-tolerant buffer acting as a fail-safe barrier with power-down protection on both sides.

Use Value: Withstands 0–3.6V input transients while V_CC is off or ramping, and limits I_off to <10 µA-preventing backfeeding and latch-up.

Use Scenario: Upgrading a 3.3V industrial HMI panel with a new 1.8V microcontroller while retaining existing 3.3V display driver ICs.

IC Role / Device Role / Timing Role: Voltage-agnostic bus repeater preserving signal polarity and timing across mixed-supply subsystems.

Use Value: Delivers 2.2V VOH and 0.4V VOL at 18 mA into 50Ω loads at V_CC = 2.5V-matching legacy driver thresholds without added delay.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC16240ADGGR	Lower drive (±24 mA only at 3.3V); no 1.8V operation; 3.6V I/O tolerance confirmed.	Requires ≥2.7V V_CC; unsuitable for true 1.8V core integration.	Select when system V_CC is fixed at 3.3V and cost is prioritized over voltage flexibility.
74ALVC16240PW	Wider V_CC range (1.65–3.6V); higher speed (t_PD = 2.1 ns typ); same pinout.	Higher ICC (40 µA quiescent); slightly lower ESD rating (1.5 kV HBM).	Select when sub-2.5 ns typical delay is required and 1.65V minimum V_CC suffices.

Compared with SN74LVC16240ADGGR and 74ALVC16240PW, the 74VCX16240TTR uniquely supports full 1.8V operation with guaranteed 2.5 ns max delay and 2 kV HBM-making it optimal for battery-powered, ultra-low-voltage embedded systems where supply headroom is constrained.

Availability

74VCX16240TTR is available at Aetrix Electronics and suitable for memory subsystem design, industrial PLC backplanes, automotive ADAS domain controllers, and hot-swappable telecom modules requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74VCX16240TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog ICs, and automotive-grade silicon.

The VCX logic family targets low-voltage, high-speed digital interfacing-designed specifically for voltage-scalable memory subsystems, FPGA-to-ASIC bridging, and mixed-signal SoC integration in industrial and automotive environments.

FAQ

Is 74VCX16240TTR compatible with 5V logic systems?

No. While its inputs and outputs tolerate up to 3.6V, the device requires V_CC between 1.8V and 3.6V and is not rated for 5V operation. Connecting to 5V buses risks exceeding absolute maximum ratings (V_I max = +4.6V, but sustained 5V violates recommended operating conditions). Use dedicated 5V-tolerant families like 74LVCH or 74ALVT for 5V interfacing.

What is the maximum capacitive load this device can drive reliably?

The 74VCX16240TTR is characterized up to 30 pF (CL = 30 pF) in AC specs, with t_PD and skew guaranteed under that load. At ±24 mA drive strength and 7 pF C_OUT, it maintains signal integrity on PCB traces up to ~10 cm with 50Ω termination. For loads >40 pF, propagation delay increases nonlinearly and VOL rises above spec-external buffering or reduced slew rate may be needed.

How does the power-down protection work on inputs and outputs?

When V_CC = 0V, internal clamping diodes and high-impedance isolation circuitry limit input/output leakage to <10 µA (I_off), preventing current backflow into unpowered sections. This allows safe connection to live 3.6V buses during power sequencing or partial system shutdown-critical for hot-swap and modular system architectures.

Can multiple 74VCX16240TTR devices share a common output enable signal?

Yes-pin 1 (1G), 24 (4G), 25 (3G), and 48 (2G) are independent active-low enables. To synchronize all 16 outputs, tie all four nG pins together to a single control line. This configuration is explicitly supported in the datasheet and maintains full 16-bit 3-state operation with <0.5 ns inter-output skew under simultaneous enable transitions.

74VCX16240TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VCX

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tape & Reel (TR)

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:: 1.8V ~ 3.6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74VCX16240TTR FAQ

1.How can I place an order for 74VCX16240TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX16240TTR 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 74VCX16240TTR reliable?

The price and inventory of 74VCX16240TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX16240TTR is usually 5 days.

3.What payment methods are accepted for 74VCX16240TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX16240TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX16240TTR?

74VCX16240TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX16240TTR 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 74VCX16240TTR?

For technical support, including 74VCX16240TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX16240TTR requirements.

6.How does Aetrix verify that 74VCX16240TTR is sourced from the original manufacturer or authorized distributors?

All 74VCX16240TTR 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 74VCX16240TTR meets industry standards.

7.What is the process for return or replacement of 74VCX16240TTR?

All 74VCX16240TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX16240TTR, 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 74VCX16240TTR part is unused and in its original packaging.

Return procedure for 74VCX16240TTR:

1.Submit a request within 90 days.

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

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