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

STMicroelectronics 74VCX1632245TTR

Name: 74VCX1632245TTR
Brand: STMicroelectronics
SKU: 74VCX1632245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX1632245TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCX1632245TTR.pdf

Description:: IC TRANSCEIVER 48TSSOP

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Product details

Overview

74VCX1632245TTR from STMicroelectronics is a dual-supply 16-bit bus transceiver with level translation, designed for bidirectional asynchronous communication between 3.3V/2.5V/1.8V buses. It features tPD = 4.4ns (max) at TA = 85°C, VCCA = 3.0V/VCCB = 2.3V, 26Ω series resistors on A-side outputs, and independent VCCA (2.3–3.6V) and VCCB (1.65–2.7V) supplies - enabling mixed-voltage system interfacing in industrial and embedded computing backplanes.

For engineers reviewing the 74VCX1632245TTR datasheet, 74VCX1632245TTR pinout, 74VCX1632245TTR application, or 74VCX1632245TTR equivalent, key selection criteria include voltage translation directionality (A↔B), power-down isolation capability, output impedance matching (|IOHA| = IOLA = 8mA min), balanced propagation delays (tPLH ≅ tPHL), and ESD robustness (>2000V HBM).

Technical Context

This IC implements two independent 8-bit transceivers (1A/1B and 2A/2B), each controlled by dedicated nDIR and nG inputs. Direction control is asynchronous and non-latched; data flows bidirectionally based on DIR state while G enables/disables the entire port pair.

It uses C2MOS sub-micron silicon gate technology with five-layer metal interconnect to achieve high-speed operation while maintaining low ICCA/ICCB ≤ 20µA (max) at 85°C. Input/output protection includes built-in diodes and 26Ω series termination on all A-side outputs to suppress reflections in high-speed parallel bus applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	tPD = 4.4ns max (VCCA=3.0V, VCCB=2.3V, TA=85°C) - enables ≤380 Mbps data rates in 1.8V↔3.3V translation.
Supply Voltage Ranges	VCCA = 2.3–3.6V; VCCB = 1.65–2.7V - supports 3.3V↔2.5V, 3.3V↔1.8V, and 2.5V↔1.8V bus interfacing.
Output Drive Strength	\|IOHA\| = IOLA = 8mA min (VCCA=3.0V, VCCB=1.65V/2.3V); \|IOHB\| = IOLB = 18mA min (VCCA=2.3V, VCCB=1.65V) - ensures signal integrity across voltage domains.
Power Dissipation	ICCA = ICCB = 20µA max at TA = 85°C - enables ultra-low static power in battery-backed or thermally constrained systems.
ESD Robustness	HBM > 2000V, MM > 200V - provides reliable handling and board-level immunity without external protection.
Bus Isolation	Power-down protection on all inputs/outputs with G = VCCB or GND - prevents current leakage and bus contention during sleep modes.
Dynamic Skew	tOSLH/tOSHL ≤ 0.75ns (VCCA=3.3V, VCCB=2.5V) - maintains timing alignment across all 16 data lines for synchronous parallel transfers.

Pinout & Package

TSSOP48 package (4.4mm × 12.5mm body, 0.5mm pitch), lead-free and RoHS-compliant. Pin 1 marked via notch; pins arranged in dual-row configuration with ground and supply pins distributed for noise suppression.

Pin/Terminal	Circuit Role	Design Meaning
1DIR, 2DIR	Direction Control Inputs	Active-high logic selects data flow direction per 8-bit port: DIR = HIGH → A→B; DIR = LOW → B→A.
G1, G2	Output Enable Inputs	Active-low enables transceiver function; when HIGH, both A and B ports enter high-impedance (Z) state for bus isolation.
1A1–1A8, 2A1–2A8	A-Side I/O Terminals	Interface with higher-voltage bus (VCCA domain); include integrated 26Ω series resistors to dampen transmission line reflections.
1B1–1B8, 2B1–2B8	B-Side I/O Terminals	Interface with lower-voltage bus (VCCB domain); no internal series resistance - optimized for drive strength at 1.65–2.7V.
VCCA, VCCB	Independent Power Supplies	VCCA powers A-side circuitry and I/Os; VCCB powers B-side - enables true dual-rail voltage translation without level-shifter ICs.
GND	Ground Reference	Eight dedicated ground pins (pins 4, 10, 15, 21, 28, 34, 39, 45) reduce ground bounce and improve noise immunity in high-speed operation.

Key Features

Feature	Design Value
Symmetric Output Impedance	Matched \|IOHA\|/IOLA and \|IOHB\|/IOLB drive strengths ensure consistent rise/fall times and reduced skew across voltage domains.
Balanced Propagation Delays	tPLH ≅ tPHL minimizes duty cycle distortion in clock-forwarding or strobed parallel interfaces.
Power-Down Protection	Inputs and outputs remain high-impedance and clamped during VCC loss or disable - prevents back-driving and latch-up.
Latch-Up Immunity	Exceeds 500mA per JESD17 - guarantees robust operation in noisy industrial environments with transient coupling.
DC Data Retention	Operates down to 1.2V on both rails - preserves register state during brown-out conditions without external backup.

Applications

Industrial Backplane Interface

Embedded Memory Subsystem

Use Scenario: Interfacing a 3.3V FPGA control bus to a 1.8V DDR2 memory controller in programmable logic-based motion controllers.

IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator; synchronizes address/data strobes across voltage domains with <4.4ns delay variation.

Use Value: Eliminates need for discrete MOSFET translators and external termination, reducing BOM count and PCB area by 35%.

Use Scenario: Connecting a 2.5V SoC host processor to a 3.3V peripheral expansion slot in medical imaging subsystems.

IC Role / Device Role / Timing Role: Dual-rail transceiver enabling hot-plug-safe communication; G inputs coordinate power sequencing with slot enable signals.

Use Value: Prevents bus contention during insertion/removal via hardware-isolated Z-state, meeting IEC 60601-1 safety requirements.

Automotive ADAS Domain Controller

Test Equipment Signal Conditioning

Use Scenario: Bridging a 3.3V sensor fusion MCU to a 2.5V high-speed CAN FD transceiver array in radar processing units.

IC Role / Device Role / Timing Role: Voltage-domain decoupler with ESD-hardened I/Os; handles burst-mode CAN traffic up to 5Mbps with <0.75ns skew.

Use Value: Maintains signal fidelity under automotive load dump transients (ISO 7637-2 Pulse 5a), avoiding protocol errors.

Use Scenario: Level-shifting between 1.8V pattern generator outputs and 3.3V DUT inputs in automated test equipment (ATE) fixtures.

IC Role / Device Role / Timing Role: Programmable-direction buffer with precise enable timing (tPZL/tPHZ ≤ 4.8ns); synchronized to tester clock edges.

Use Value: Enables sub-nanosecond setup/hold margin control for high-speed digital validation at 380 Mbps.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AVC16T245DGGR	Lower VCCB min (1.2V), higher max data rate (500 Mbps), but no A-side series resistors - requires external termination.	Better suited for ultra-high-speed point-to-point links; less tolerant of unterminated stubs in multi-drop buses.	Select when maximum speed >380 Mbps is required and PCB layout allows controlled-impedance routing.
TXS0108EPWR	Auto-direction sensing (no DIR pin), lower drive (8mA typ), no power-down protection on inputs - higher risk of bus contention.	Ideal for simple GPIO expansion; unsuitable for bidirectional burst-mode protocols requiring deterministic direction control.	Choose only for low-pin-count, low-power I²C/SPI peripheral extension where direction is software-managed.

Compared with SN74AVC16T245DGGR and TXS0108EPWR, the 74VCX1632245TTR uniquely combines deterministic DIR/G control, integrated A-side termination, and full power-down protection - making it optimal for legacy parallel bus upgrades in industrial and automotive systems where reliability trumps raw speed.

Availability

74VCX1632245TTR is available at Aetrix Electronics and suitable for industrial backplanes, embedded memory subsystems, automotive ADAS domain controllers, and test equipment signal conditioning requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for 74VCX1632245TTR 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 components.

The VCX logic family targets low-voltage, high-speed interface applications in mixed-supply systems - specifically engineered for voltage translation, bus isolation, and ESD-hardened interconnect in industrial and automotive electronics.

FAQ

What is the minimum operating voltage for VCCB while maintaining guaranteed DC specifications?

The datasheet specifies VCCB(OPR) = 1.65V to 2.7V for full DC parameter compliance. At 1.2V, only data retention is guaranteed - not logic functionality, drive strength, or timing. Operation below 1.65V violates recommended conditions and may cause undefined output states or increased ICC leakage.

Can 74VCX1632245TTR translate between 3.3V and 1.2V buses?

No - while the device retains data at 1.2V, its B-side I/Os are only characterized down to 1.65V. Translating to 1.2V yields only 100 Mbps max data rate and violates VCCB's recommended operating range; VOHB/VOLB specs become invalid, risking logic threshold violations and timing failures.

Is the TSSOP48 package pin-compatible with other 74-series 16-bit transceivers?

Yes - the 74VCX1632245TTR is explicitly pin- and function-compatible with the 74-series 16245, including identical pin numbering for DIR, G, A/B I/Os, VCC, and GND. This enables drop-in replacement in existing layouts without redesign.

Does the 26Ω series resistor apply to both directions of data flow on A-side pins?

Yes - the 26Ω resistor is placed in series with each A-side I/O terminal (1A1–1A8, 2A1–2A8) regardless of direction. It attenuates reflections during both A→B and B→A transfers, improving signal integrity on the higher-voltage (VCCA) bus side.

74VCX1632245TTR 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:: Translation Transceiver

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA; 18mA, 18mA

Voltage - Supply:: 1.65V ~ 2.7V, 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74VCX1632245TTR FAQ

1.How can I place an order for 74VCX1632245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX1632245TTR 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 74VCX1632245TTR reliable?

The price and inventory of 74VCX1632245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX1632245TTR is usually 5 days.

3.What payment methods are accepted for 74VCX1632245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX1632245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX1632245TTR?

74VCX1632245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX1632245TTR 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 74VCX1632245TTR?

For technical support, including 74VCX1632245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX1632245TTR requirements.

6.How does Aetrix verify that 74VCX1632245TTR is sourced from the original manufacturer or authorized distributors?

All 74VCX1632245TTR 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 74VCX1632245TTR meets industry standards.

7.What is the process for return or replacement of 74VCX1632245TTR?

All 74VCX1632245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX1632245TTR, 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 74VCX1632245TTR part is unused and in its original packaging.

Return procedure for 74VCX1632245TTR:

1.Submit a request within 90 days.

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

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