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

STMicroelectronics 74VCX1632245LBR

Name: 74VCX1632245LBR
Brand: STMicroelectronics
SKU: 74VCX1632245LBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX1632245LBR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 54-TFBGA

Datasheet:: 74VCX1632245LBR.pdf

Description:: IC TRANSCEIVER 54TFBGA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VCX1632245LBR 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) supplies, 4.4ns max propagation delay at 85°C, 26Ω series resistors on A-side outputs, and pin/function compatibility with 74-series 16245. It enables high-speed data exchange in mixed-voltage memory or peripheral interfaces.

For engineers reviewing the 74VCX1632245LBR datasheet, 74VCX1632245LBR pinout, 74VCX1632245LBR application, or 74VCX1632245LBR equivalent, this device supports critical design tasks including voltage-domain isolation in DDR memory subsystems, low-power I/O bridging in portable SoC platforms, and noise-immune signal translation in industrial control backplanes.

Technical Context

This IC implements asynchronous bidirectional data flow controlled by two independent direction inputs (1DIR, 2DIR) and two output-enable inputs (G1, G2), supporting per-8-bit channel enablement. Each port operates under separate supply domains: A-port (3.3V/2.5V-tolerant) connects to higher-voltage buses, B-port (1.8V/2.5V-tolerant) interfaces with lower-voltage logic.

It integrates power-down protection on all I/Os during disable states, guarantees latch-up immunity >500mA (JESD17), and provides ESD robustness of >2000V HBM. The 26Ω on-die series termination on A-side outputs reduces signal reflections without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	4.4ns max (tPLH/tPHL, VCCA=3.0V, VCCB=2.3V, TA=85°C) - ensures sub-5ns timing margin for 200MHz+ bus operation
Supply Voltage Ranges	VCCA = 2.3–3.6V; VCCB = 1.65–2.7V - enables flexible interfacing across 3.3V/2.5V/1.8V system domains
Output Drive Strength	\|IOHA\| = \|IOLA\| = 8mA min (VCCA=3.0V, VCCB=1.65V/2.3V) - sufficient to drive 50Ω transmission lines with controlled edge rates
Max Data Rate	380 Mbps (1.8V ↔ 3.3V translation) - supports high-throughput memory and peripheral interconnects
Quiescent Current	ICCA = ICCB = 20µA max at TA=85°C - enables ultra-low standby power in battery-sensitive applications
Input/Output Capacitance	CI/O = 6pF (VCCA=3.3V, VCCB=2.5V) - minimizes capacitive loading on source and destination buses
Series Termination	26Ω on all A-side outputs - eliminates need for discrete series resistors, reducing BOM count and PCB area

Pinout & Package

74VCX1632245LBR is housed in a 54-ball TFBGA package (ball pitch: 0.5mm, body size: 4.0 × 4.0 mm). Pin mapping follows JEDEC MO-249 standard with defined top-side orientation and ball labeling per manufacturer mechanical drawing 7390143/C.

Pin/Terminal	Circuit Role	Design Meaning
G1, G2	Output Enable Inputs	Active-low enables per-8-bit channel; when high, corresponding A/B ports enter high-impedance state
1DIR, 2DIR	Direction Controls	Determines data flow direction per 8-bit channel: low = A→B, high = B→A
1A1–1A8, 2A1–2A8	A-Side I/Os	Connect to higher-voltage bus (VCCA domain); include integrated 26Ω series resistance
1B1–1B8, 2B1–2B8	B-Side I/Os	Connect to lower-voltage bus (VCCB domain); no internal series resistance
VCCA	A-Port Supply	Power rail for A-side I/O circuitry and input buffers; must be ≥ VCCB and within 2.3–3.6V range
VCCB	B-Port Supply	Power rail for B-side I/O circuitry and input buffers; must be ≤ VCCA and within 1.65–2.7V range
GND	Ground Reference	Common reference for both supply domains; requires low-inductance connection to minimize ground bounce

Key Features

Feature	Design Value
Dual independent supply rails	VCCA and VCCB operate independently - allows seamless translation between non-matching voltage domains without level-shifter ICs
On-die 26Ω A-side termination	Eliminates need for 16 external series resistors - reduces layout complexity and improves signal integrity on high-speed traces
Power-down I/O protection	All inputs and outputs remain high-impedance and clamped during G assertion - prevents back-driving and bus contention
High ESD/latch-up immunity	HBM >2000V; latch-up >500mA (JESD17) - suitable for manufacturing environments and field-replaceable modules
Pin-compatible with 74LCX16245	Drop-in replacement for legacy 16-bit transceivers - simplifies upgrade paths in existing designs without PCB rework

Applications

DDR Memory Interface

SoC Peripheral Bridge

Use Scenario: Interfacing a 3.3V FPGA memory controller with 1.8V DDR SDRAM chips.

IC Role / Device Role / Timing Role: Bidirectional level translator managing address, data, and control signals between mismatched voltage domains.

Use Value: Enables direct connection without external voltage translators or resistive dividers, preserving tAC timing margins via 4.4ns max propagation delay.

Use Scenario: Connecting a 2.5V microcontroller's parallel bus to a 3.3V display driver IC.

IC Role / Device Role / Timing Role: Asynchronous bus transceiver isolating supply domains while maintaining signal integrity across 16-bit data path.

Use Value: 26Ω A-side series termination suppresses ringing on 3.3V side, allowing reliable 380 Mbps operation without added layout constraints.

Industrial Backplane Isolation

Portable Device I/O Expansion

Use Scenario: Isolating 3.3V CPU bus from 2.5V sensor hub in programmable logic controller backplane.

IC Role / Device Role / Timing Role: Dual-channel transceiver enabling independent enable/disable of sensor and actuator data lanes.

Use Value: Per-channel G1/G2 and DIR controls allow dynamic power gating of unused lanes, reducing system-level leakage current.

Use Scenario: Expanding GPIO count of an ultra-low-power 1.8V ARM Cortex-M0+ MCU using a 3.3V peripheral ASIC.

IC Role / Device Role / Timing Role: Low-quiescent-current (20µA max) voltage translator enabling always-on I/O expansion without compromising battery life.

Use Value: 20µA ICCA/ICCB at 85°C permits continuous operation in thermally constrained handheld enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AVC16T245RKL	Single-supply (1.2–3.6V), no built-in series resistors, 3.8ns max tPD at 1.8V/3.3V	Lacks per-port supply separation; requires external termination for clean edges on 3.3V side	Preferred when board space is constrained and external termination is acceptable
74LVC16245APAG	Single 3.3V supply only, no VCCB rail, 5.2ns max tPD, no integrated series resistors	Cannot translate below 3.3V; requires external level shifters for 1.8V/2.5V interfaces	Only viable if entire system operates at 3.3V with no mixed-voltage requirements

Compared with SN74AVC16T245RKL and 74LVC16245APAG, the 74VCX1632245LBR uniquely delivers dual-supply operation with on-die A-side termination-enabling true plug-and-play voltage translation without layout compromises or additional components.

Availability

74VCX1632245LBR is available at Aetrix Electronics and suitable for DDR memory subsystems, SoC peripheral bridges, industrial backplane interfaces, and portable device I/O expansion requiring stable component supply across automotive-grade temperature ranges.

Supply support for 74VCX1632245LBR 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, and automotive ICs.

The VCX logic family targets high-speed, low-voltage mixed-signal interfacing-designed specifically for voltage translation and bus isolation in portable, industrial, and communications equipment where power efficiency and signal integrity are critical.

FAQ

What is the minimum operating voltage for VCCB when VCCA = 3.3V?

VCCB must be ≥1.65V and ≤ VCCA per datasheet Table 5; therefore, with VCCA = 3.3V, VCCB can be as low as 1.65V. This enables translation from 3.3V to 1.8V or 1.65V logic families while maintaining guaranteed DC specifications including VIHB/VILB thresholds and VOLB/VOHB levels.

Can the 74VCX1632245LBR drive a 50Ω transmission line directly?

Yes-the 26Ω series resistor on each A-side output, combined with typical PCB trace impedance (~24Ω), forms a near-perfect match to 50Ω loads. Measured dynamic characteristics (VOLVA/VOHVA) confirm clean edges and minimal overshoot under 30pF load conditions, eliminating need for external termination.

Is there any restriction on the sequence of power supply ramp-up?

Yes-VCCA must be powered before or simultaneously with VCCB. Applying VCCB before VCCA risks violating absolute maximum rating VI/OA (−0.5V to VCCA + 0.5V), potentially damaging A-side I/O structures. The datasheet recommends monotonic ramping with VCCA leading by ≥100ms.

How does the device behave when G1 and G2 are held high while DIR inputs are toggled?

When G1/G2 are high, both A- and B-side ports enter high-impedance (Hi-Z) state regardless of DIR state. Data flow is fully blocked; no current flows between ports, and I/O leakage remains ≤±10µA. This provides robust bus isolation during power sequencing or fault conditions.

74VCX1632245LBR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VCX

Package/Case:: 54-TFBGA

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:: 54-TFBGA (8x5.5)

74VCX1632245LBR FAQ

1.How can I place an order for 74VCX1632245LBR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX1632245LBR 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 74VCX1632245LBR reliable?

The price and inventory of 74VCX1632245LBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX1632245LBR is usually 5 days.

3.What payment methods are accepted for 74VCX1632245LBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX1632245LBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX1632245LBR?

74VCX1632245LBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX1632245LBR 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 74VCX1632245LBR?

For technical support, including 74VCX1632245LBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX1632245LBR requirements.

6.How does Aetrix verify that 74VCX1632245LBR is sourced from the original manufacturer or authorized distributors?

All 74VCX1632245LBR 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 74VCX1632245LBR meets industry standards.

7.What is the process for return or replacement of 74VCX1632245LBR?

All 74VCX1632245LBR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX1632245LBR, 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 74VCX1632245LBR part is unused and in its original packaging.

Return procedure for 74VCX1632245LBR:

1.Submit a request within 90 days.

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

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