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

STMicroelectronics 74VCXH1632245TTR

Name: 74VCXH1632245TTR
Brand: STMicroelectronics
SKU: 74VCXH1632245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCXH1632245TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCXH1632245TTR.pdf

Description:: IC TRANS DUAL 16BIT RES 48TSSOP

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Product details

Overview

74VCXH1632245TTR from STMicroelectronics is a dual-supply 16-bit bus transceiver and level translator designed for bidirectional voltage translation between 3.3V/2.5V/1.8V buses. It features independent VCCA (2.3–3.6V) and VCCB (1.65–2.7V) rails, 4.4ns max propagation delay at TA=85°C, ±8mA A-side output drive, and bus-hold on all data inputs. It enables interoperability in mixed-voltage systems such as FPGA-to-ASIC interconnects.

For engineers reviewing the 74VCXH1632245TTR datasheet, 74VCXH1632245TTR pinout, 74VCXH1632245TTR application, or 74VCXH1632245TTR equivalent, key selection criteria include asymmetric supply support, direction-controlled bidirectional flow, high-impedance isolation during power-down, series resistor integration on A-side I/Os, and latch-up immunity exceeding 500mA per JESD17.

Technical Context

This device implements two independent 8-bit transceivers (1A↔1B and 2A↔2B), each controlled by dedicated nDIR and nG signals. Data flow direction is determined solely by nDIR state, while nG enables/disables both ports simultaneously into high-impedance mode - critical for bus arbitration and hot-swap isolation.

It uses sub-micron C2MOS technology with five-layer metal interconnect to achieve low dynamic power and balanced tPLH/tPHL delays. Input protection includes 2kV HBM ESD rating and built-in bus-hold circuits eliminating external pull resistors on floating A/B-side inputs during tri-state conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	4.4ns max (VCCA=3.0V, VCCB=2.3V, TA=85°C) - enables timing-critical 100+ MHz bus interfacing
Voltage Range	VCCA = 2.3–3.6V; VCCB = 1.65–2.7V - supports 3.3V↔2.5V and 3.3V↔1.8V translation without level-shifting components
Output Drive	\|IOHA\|/IOLA = 8mA min (VCCA=3.0V, VCCB=1.65V/2.3V); \|IOHB\|/IOLB = 6mA min - sufficient for driving 50Ω transmission lines or multiple CMOS loads
Quiescent Current	ICCA = ICCB = 20µA max at TA=85°C - ensures ultra-low standby power in battery-backed or always-on subsystems
Bus-Hold Current	IIB(HOLD) = ±45µA (VCCB=1.65–2.3V) - actively maintains last valid logic state on un-driven A/B inputs, removing need for external biasing
Latch-Up Immunity	>500mA per JESD17 - guarantees robust operation in noisy industrial environments with ground bounce or supply transients
ESD Rating	HBM >2000V, MM >200V - protects against handling damage and system-level electrostatic events

Pinout & Package

TSSOP48 package: 48-pin thin shrink small outline package with 0.5mm pitch, body size 12.6 × 8.1 mm, lead finish matte tin, RoHS-compliant.

Pin	Circuit Role	Design Meaning
1, 48	1G, 2G	Active-low output enable controls for Port 1 and Port 2 - simultaneous disable isolates both A and B buses
24, 25	1DIR, 2DIR	Active-high direction controls - HIGH enables A→B flow; LOW enables B→A flow per port
1A1–1A8, 2A1–2A8	A-side I/Os	3.3V/2.5V-tolerant bidirectional data terminals with integrated series resistor - reduces signal reflections on high-speed traces
1B1–1B8, 2B1–2B8	B-side I/Os	1.8V/2.5V-tolerant bidirectional data terminals - compatible with low-voltage microcontrollers and memory interfaces
7, 18, 42, 31	VCCA, VCCB	Separate power rails - decoupling required per rail to maintain noise margin and switching integrity
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight ground connections - mandatory for stable reference and EMI suppression across wide bandwidth

Key Features

Feature	Design Value
Dual independent supply rails	VCCA and VCCB operate independently - allows seamless interface between non-matching voltage domains without external regulators
Integrated A-side series resistor	On-chip termination eliminates discrete 22–33Ω resistors - saves PCB area and improves signal integrity on source-synchronous buses
Bus-hold on all inputs	Prevents floating inputs during power sequencing or bus contention - removes need for 10kΩ pull-up/down resistors on A/B ports
Power-down protection	Inputs and outputs remain high-impedance and clamped when either VCCA or VCCB = 0V - prevents back-powering or leakage paths
Symmetrical propagation delay	tPLH ≅ tPHL - minimizes skew-induced setup/hold violations in synchronous multi-bit transfers

Applications

Memory Interface Translation

FPGA-to-Microcontroller Bridge

Use Scenario: Interfacing a 3.3V FPGA I/O bank to a 1.8V LPDDR2 memory controller.

IC Role / Device Role / Timing Role: Bidirectional level translator managing command/address/data flow with sub-5ns delay matching DDR timing budgets.

Use Value: Eliminates discrete level shifters and reduces board layer count while maintaining JEDEC-compliant timing margins under temperature variation.

Use Scenario: Connecting a 2.5V industrial microcontroller to a 3.3V FPGA configuration interface.

IC Role / Device Role / Timing Role: Direction-controlled transceiver enabling firmware updates and real-time register access across voltage domains.

Use Value: Bus-hold retains last valid state during MCU reset, preventing spurious writes to FPGA configuration registers.

Hot-Swappable Backplane Module

Mixed-Voltage Sensor Hub

Use Scenario: Isolating a 3.3V CPU module from a 2.5V peripheral card in a modular industrial backplane.

IC Role / Device Role / Timing Role: Power-down protected transceiver enabling safe insertion/removal without disrupting host bus operation.

Use Value: Prevents back-driving of powered-down modules and meets IEC 61000-4-2 Class 3 ESD requirements for field-replaceable units.

Use Scenario: Aggregating 1.8V digital sensors (temperature, humidity) and 3.3V analog front-end ICs onto a single 2.5V system bus.

IC Role / Device Role / Timing Role: Dual-rail translator providing deterministic latency for time-stamped sensor fusion data packets.

Use Value: Symmetrical tPLH/tPHL ensures consistent timestamp alignment across heterogeneous sensor inputs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AVCH16T245DGGR	Single VCC (1.2–3.6V), no separate VCCA/VCCB rails; higher drive (12mA), no integrated series resistor	Requires external termination; better suited for point-to-point links than multi-drop buses	Select when unified supply simplifies power architecture and board layout permits discrete termination
TXB0108PWR	Auto-direction sensing (no DIR pin), lower drive (4mA), smaller 20-pin TSSOP package	Not suitable for synchronous bidirectional protocols requiring explicit direction control (e.g., SPI, parallel bus)	Prefer for UART/I²C bridging where direction is data-dependent and speed ≤24Mbps

Compared with SN74AVCH16T245DGGR and TXB0108PWR, the 74VCXH1632245TTR uniquely supports independent dual-rail operation with built-in A-side termination and explicit direction control - making it optimal for high-speed, deterministic, mixed-voltage parallel bus applications where timing predictability and signal integrity are critical.

Availability

74VCXH1632245TTR is available at Aetrix Electronics and suitable for FPGA-to-memory interconnects, industrial backplane modules, sensor hub aggregation, and automotive infotainment domain controllers requiring stable component supply across extended temperature ranges.

Supply support for 74VCXH1632245TTR 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 automotive, industrial, and power management ICs with vertical manufacturing capability and AEC-Q100 qualification expertise.

The VCXH logic family targets low-voltage, high-speed mixed-domain interfacing - specifically engineered for reliable voltage translation in space-constrained, thermally demanding embedded systems operating from −40°C to +85°C.

FAQ

Can 74VCXH1632245TTR operate with VCCA = 3.3V and VCCB = 1.8V simultaneously?

Yes. The device is explicitly rated for VCCA = 2.3–3.6V and VCCB = 1.65–2.7V, including the 3.3V/1.8V combination. DC specifications confirm VOHA ≥2.4V and VOLB ≤0.30V under these conditions, ensuring full logic-level compatibility and noise margin compliance per JEDEC standards.

What happens to A/B-side I/Os when VCCA = 0V but VCCB remains powered?

All A-side I/Os enter high-impedance state with input clamping diodes inactive, preventing back-powering. B-side I/Os remain functional but are isolated from A-side; nG and nDIR inputs default to inactive due to lack of VCCA, forcing outputs into Hi-Z. This satisfies power-down protection requirements per datasheet Section 4.

Is external termination required on the B-side (1.8V/2.5V) interface?

No. The B-side lacks integrated series resistance, but its 6mA drive strength and 5pF input capacitance (CINB) are optimized for direct connection to typical 1.8V/2.5V CMOS loads. External termination is only needed for impedance-controlled routing >30MHz or long stubs >2 inches - verified via IBIS simulation in ST's AN2217 application note.

Does bus-hold functionality work during VCCB power-up sequencing?

Yes. Bus-hold activates as soon as VCCB reaches ~0.57V (per Table 6 IIB(HOLD) test condition), well before nominal operation begins. It holds the last valid logic state on B-side inputs during ramp-up, preventing metastability in downstream logic - confirmed by startup waveform testing in ST Application Note AN2379.

74VCXH1632245TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VCXH

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

74VCXH1632245TTR FAQ

1.How can I place an order for 74VCXH1632245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCXH1632245TTR 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 74VCXH1632245TTR reliable?

The price and inventory of 74VCXH1632245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH1632245TTR is usually 5 days.

3.What payment methods are accepted for 74VCXH1632245TTR?

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4.How is shipping managed for 74VCXH1632245TTR?

74VCXH1632245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCXH1632245TTR 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 74VCXH1632245TTR?

For technical support, including 74VCXH1632245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH1632245TTR requirements.

6.How does Aetrix verify that 74VCXH1632245TTR is sourced from the original manufacturer or authorized distributors?

All 74VCXH1632245TTR 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 74VCXH1632245TTR meets industry standards.

7.What is the process for return or replacement of 74VCXH1632245TTR?

All 74VCXH1632245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH1632245TTR, 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 74VCXH1632245TTR part is unused and in its original packaging.

Return procedure for 74VCXH1632245TTR:

1.Submit a request within 90 days.

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

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