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

STMicroelectronics 74VCX16245TTR

Name: 74VCX16245TTR
Brand: STMicroelectronics
SKU: 74VCX16245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX16245TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCX16245TTR.pdf

Description:: IC TXRX NON-INVERT 3.6V 48TSSOP

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Product details

Overview

74VCX16245TTR from STMicroelectronics is a low-voltage CMOS 16-bit bus transceiver with 3-state outputs, 3.6V-tolerant I/O, and dual-bus directional control via DIR inputs. It operates from 1.8V to 3.6V, delivers 2.5 ns max propagation delay at 3.0–3.6V, supports ±24 mA drive at VCC = 3.0V, and enables bidirectional data isolation in memory-mapped peripheral interfaces.

For engineers reviewing the 74VCX16245TTR datasheet, 74VCX16245TTR pinout, 74VCX16245TTR application, or 74VCX16245TTR equivalent, key selection criteria include voltage-range compatibility (1.8–3.6V), 3.6V-tolerant I/O for mixed-supply interconnects, symmetrical output drive strength, power-down input/output protection, and TSSOP-48 package footprint constraints.

Technical Context

This device implements two independent 8-bit bidirectional bus transceivers (Bus A ↔ Bus B), each controlled by dedicated DIR and nG signals. Directional flow is asynchronous and non-latched: DIR = LOW enables A→B transmission; DIR = HIGH enables B→A. Both transceivers enter high-impedance state when their respective nG is HIGH.

Input and output structures incorporate robust ESD protection (HBM > 2000V, MM > 200V) and power-down leakage suppression (Ioff ≤ 10 µA). The C2MOS process ensures latch-up immunity exceeding 300 mA per JESD17, and dynamic quiet-output specifications (VOLP/VOLV/VOHV) are guaranteed across all operating voltages.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.8V to 3.6V - Enables direct interface between 1.8V logic domains and 3.3V/3.6V signal environments without level shifters.
Max Propagation Delay	2.5 ns at VCC = 3.0–3.6V - Supports >300 MHz bus toggle rates in high-speed memory or FPGA peripheral interconnects.
Output Drive Strength	±24 mA at VCC = 3.0V - Sustains clean signal integrity driving 500Ω loads with 30pF capacitance per AC spec conditions.
I/O Voltage Tolerance	3.6V tolerant - Allows safe connection to 3.3V or 3.6V buses while powered from 1.8V, eliminating external clamping diodes.
Power-Down Leakage	Ioff ≤ 10 µA - Ensures negligible current draw during system sleep modes, critical for battery-backed subsystems.
ESD Immunity	HBM > 2000V, MM > 200V - Meets industrial handling requirements without additional board-level protection circuitry.
Operating Temperature	−55°C to +125°C - Qualified for extended-temperature industrial and automotive under-hood applications.

Pinout & Package

TSSOP-48 package (48-pin thin shrink small outline package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, lead-free and RoHS-compliant. Pin 1 marked by beveled corner; thermal pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1, 48	1DIR / 1G	Direction and enable control for first 8-bit transceiver (Bus A1–A8 ↔ Bus B1–B8); active-low enable, active-high direction.
2–9, 11–12, 47–40, 38–36	A1–A8 / B1–B8	Bidirectional data terminals: A-side pins connect to local bus; B-side pins connect to remote bus; function depends on DIR state.
13–23, 26–35, 39, 45	B1–B8 / A1–A8	Mirrored bidirectional I/O set for second 8-bit transceiver (Bus A9–A16 ↔ Bus B9–B16), independently controlled by 2DIR/2G.
24, 25	2DIR / 2G	Direction and enable control for second 8-bit transceiver; identical logic behavior to 1DIR/1G but electrically isolated.
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight dedicated ground pins distributed across package - minimizes ground bounce and improves noise immunity in high-speed switching.
7, 18, 31, 42	VCC	Four dedicated VCC pins - reduces supply impedance and stabilizes core voltage during simultaneous 16-bit output transitions.

Key Features

Feature	Design Value
3.6V-tolerant I/O	Inputs and outputs withstand up to 4.6V absolute max, enabling safe interfacing with higher-voltage buses while operating at 1.8V.
Symmetrical output drive	\|IOH\| = IOL = 24 mA min at 3.0V - eliminates skew between rising/falling edges in push-pull bus environments.
Power-down protection	Ioff ≤ 10 µA at VCC = 0V - prevents back-driving of powered buses when device is unpowered, protecting upstream logic.
High-speed propagation	tPD = 2.5 ns max at 3.0–3.6V - meets timing closure for sub-5 ns clock-to-output paths in FPGA-to-ASIC bridging applications.
Latch-up immunity	Exceeds 300 mA per JESD17 - ensures robust operation in noisy industrial power rail environments with transient coupling.

Applications

Memory Interface Bridging

FPGA Peripheral Expansion

Use Scenario: Interfacing a 1.8V FPGA I/O bank to a 3.3V SRAM or Flash memory bus with shared address/data lines.

IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction via FPGA-controlled DIR signals; provides timing-critical path isolation during read/write cycles.

Use Value: Eliminates need for discrete level shifters while maintaining 2.5 ns propagation delay - preserves setup/hold margins in 100+ MHz memory access protocols.

Use Scenario: Extending an FPGA's GPIO bank to drive multiple 3.3V industrial sensors and actuators over a shared parallel bus.

IC Role / Device Role / Timing Role: Isolating FPGA logic from external bus transients; DIR and nG signals dynamically configure data direction per sensor polling cycle.

Use Value: 3.6V-tolerant I/O prevents damage from sensor ESD events; ±24 mA drive ensures reliable signal integrity across 15 cm PCB traces.

Processor Local Bus Extension

Legacy ISA-Compatible Interface

Use Scenario: Connecting a low-power ARM microcontroller (1.8V core, 3.3V I/O) to legacy peripherals using a multiplexed address/data bus.

IC Role / Device Role / Timing Role: Acting as a voltage-aware bus buffer that translates between processor I/O voltage and peripheral voltage domains while preserving timing alignment.

Use Value: Dual 8-bit sections allow independent control of address vs. data lanes; tPLZ/tPHZ < 4.7 ns ensures fast bus release for multi-master arbitration.

Use Scenario: Retrofitting modern low-voltage controllers into legacy ISA-bus systems requiring 3.3V-compatible data transceivers.

IC Role / Device Role / Timing Role: Replacing obsolete 74LVC16245 in ISA slot edge connectors where 3.6V tolerance accommodates legacy 5V-tolerant signaling margins.

Use Value: Pin- and function-compatible with 74-series 16240/16245 families - enables drop-in replacement without PCB redesign.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bidirectional bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC16245ADGGR	Lower drive (±24 mA only at 3.3V), no 1.8V operation; 3.6V I/O tolerance confirmed.	Requires ≥3.0V supply; unsuitable for true 1.8V-only systems.	Select when system VCC is fixed at 3.3V and cost is prioritized over ultra-low-voltage support.
74ALVC16245PW	Wider VCC range (1.65–3.6V); slightly slower (tPD = 3.3 ns max at 3.3V); same pinout.	Marginally better 1.65V compatibility but lower speed ceiling.	Select when interoperability with 1.65V ASICs is required and 3.3 ns delay is acceptable.

Compared with SN74LVC16245ADGGR and 74ALVC16245PW, the 74VCX16245TTR uniquely supports full 1.8V operation with 2.5 ns speed and guaranteed 3.6V I/O tolerance - making it optimal for mixed-voltage portable and industrial embedded designs where both low power and high timing margin are essential.

Availability

74VCX16245TTR is available at Aetrix Electronics and suitable for memory interface bridging, FPGA peripheral expansion, processor local bus extension, and legacy ISA-compatible interface applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for 74VCX16245TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The VCX logic family targets ultra-low-voltage, high-speed interface applications - specifically engineered for 1.8V–3.6V mixed-signal systems requiring robust I/O tolerance, minimal propagation delay, and industrial-grade reliability.

FAQ

What is the minimum supply voltage at which 74VCX16245TTR guarantees full functionality?

The device is fully specified from 1.8V to 3.6V. At VCC = 1.8V, it delivers guaranteed tPLH/tPHL ≤ 5.7 ns, IOH/IOL ≥ ±6 mA, VIH = 0.7×VCC, and VOL ≤ 0.3V with 6 mA load - meeting all DC and AC specs per datasheet Tables 5–7.

Can 74VCX16245TTR safely interface a 1.8V FPGA to a 5V-tolerant peripheral?

No. While inputs tolerate up to 4.6V absolute maximum, sustained 5V signals exceed this rating and risk permanent damage. It is rated for 3.6V-tolerant I/O only - use external clamping or dedicated 5V-tolerant translators for true 5V interfaces.

How does the power-down protection (Ioff) behave when VCC = 0V?

When VCC = 0V, all inputs and outputs exhibit ≤10 µA leakage (Ioff) regardless of applied voltage (0–3.6V), preventing back-current flow into unpowered circuitry - a critical feature for hot-swap or partial-power-down system architectures.

Are the DIR and nG inputs 3.6V-tolerant when VCC = 1.8V?

Yes. All inputs - including DIR and nG - are 3.6V-tolerant across the full VCC operating range (1.8–3.6V). This allows control signals sourced from higher-voltage domains to directly drive enable/direction logic without level translation.

74VCX16245TTR 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:: Transceiver, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 8

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

74VCX16245TTR FAQ

1.How can I place an order for 74VCX16245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX16245TTR 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 74VCX16245TTR reliable?

The price and inventory of 74VCX16245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX16245TTR is usually 5 days.

3.What payment methods are accepted for 74VCX16245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX16245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX16245TTR?

74VCX16245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX16245TTR 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 74VCX16245TTR?

For technical support, including 74VCX16245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX16245TTR requirements.

6.How does Aetrix verify that 74VCX16245TTR is sourced from the original manufacturer or authorized distributors?

All 74VCX16245TTR 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 74VCX16245TTR meets industry standards.

7.What is the process for return or replacement of 74VCX16245TTR?

All 74VCX16245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX16245TTR, 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 74VCX16245TTR part is unused and in its original packaging.

Return procedure for 74VCX16245TTR:

1.Submit a request within 90 days.

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

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