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

onsemi 74LCXH32245G

Name: 74LCXH32245G
Brand: onsemi
SKU: 74LCXH32245G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXH32245G

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 96-LFBGA

Datasheet:: 74LCXH32245G.pdf

Description:: IC TXRX NON-INVERT 3.6V 96FBGA

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Product details

Overview

74LCXH32245 from Fairchild Semiconductor is a low-voltage 32-bit bidirectional transceiver with 5V-tolerant I/O, bushold inputs, and byte-level direction control. It operates at 2.3–3.6 V_CC, delivers ≤4.5 ns propagation delay at 3.3 V, supports ±24 mA drive, and interfaces between 2.5/3.3 V buses and legacy 5 V systems in memory expansion and backplane interconnects.

For engineers reviewing the 74LCXH32245 datasheet, pinout, applications, or equivalent options, key selection criteria include 5V I/O tolerance, bushold-enabled input hold without external resistors, FBGA96A package compatibility, byte-wise T/R and OE control, and live insertion support for hot-swap subsystems.

Technical Context

The 74LCXH32245 implements four independent 8-bit bidirectional data paths, each with dedicated T/R (direction) and OE (output enable) controls-enabling selective 8-bit, 16-bit, or full 32-bit bus operation. Its bushold circuitry actively maintains last-valid logic state on floating inputs, eliminating external biasing.

It uses advanced CMOS fabrication to achieve high-speed switching (t_PHL/t_PLH ≤ 4.5 ns @ 3.3 V) while maintaining low ICC (≤20 µA quiescent), and features power-off high-impedance I/O and patented EMI/noise reduction circuitry for robust signal integrity in dense PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3 V to 3.6 V - Enables direct interface with 2.5 V and 3.3 V logic domains without level shifters.
Propagation Delay	≤4.5 ns max @ V_CC = 3.3 V - Supports high-speed data transfer across 32-bit parallel buses up to ~220 MHz effective rate.
I/O Voltage Tolerance	0 V to 5.5 V - Allows safe connection to 5 V signals without damage or clamping diodes.
Output Drive	±24 mA @ V_CC = 3.0 V - Drives standard TTL loads and multiple CMOS inputs without buffering.
Bushold Current	±45 µA min @ V_CC = 2.3 V - Actively holds floating inputs at valid logic levels, removing need for pull-up/down resistors.
Power-off Z-State	High-impedance I/O when V_CC = 0 V - Prevents back-driving and bus contention during power sequencing or hot removal.
ESD Rating	HBM > 2000 V - Withstands handling and board assembly electrostatic discharge per JEDEC JS-001.

Pinout & Package

Packaged in 96-ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205 compliant, 5.5 mm × 5.5 mm body, 0.8 mm ball pitch, BGA96A package number.

Pin/Terminal	Circuit Role	Design Meaning
OEn (n=1–4)	Active-Low Output Enable	Disables both A and B ports of corresponding 8-bit byte into high-impedance state; requires pull-up to V_CC for power-up safety.
T/Rn (n=1–4)	Direction Control Input	Determines data flow: LOW = B→A, HIGH = A→B for each 8-bit segment independently.
A0–A31	Side-A I/O Port	32-bit bidirectional buffer terminal; functions as input or 3-STATE output depending on T/Rn and OEn states.
B0–B31	Side-B I/O Port	32-bit bidirectional buffer terminal mirroring A-side behavior; enables full-duplex or half-duplex bus bridging.
V_CC1 / V_CC2	Supply Pins	Two separate V_CC pins (pins C3/C4, F3/F4, L3/L4, P3/P4) reduce supply noise and improve decoupling for high-speed switching.
GND	Ground Terminals	Multiple GND balls (e.g., B2/B3, D2/D3, E2/E3, etc.) provide low-inductance return paths and minimize ground bounce.

Key Features

Feature	Design Value
5V-tolerant I/O	Supports mixed-voltage system integration without external voltage translators or protection circuitry.
Bushold inputs	Eliminates external pull resistors on unused or unterminated inputs-reducing BOM count and PCB area.
Byte-selectable control	Four independent OE/T/R pairs allow granular bus partitioning-e.g., isolate memory vs. peripheral segments dynamically.
Live insertion support	Power-off high-Z and 5V-tolerant I/O enable safe hot-plug operation in modular backplanes and carrier cards.
Noise/EMI reduction	Patented internal circuitry suppresses simultaneous switching noise-critical for signal integrity in high-density 32-bit buses.

Applications

Memory Expansion Interface	Industrial Backplane Interconnect
Use Scenario: Extending 32-bit data/address bus between a 3.3 V microcontroller and legacy 5 V SRAM or Flash memory modules. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver managing data flow direction and isolation between mismatched voltage domains. Use Value: Eliminates discrete level shifters and reduces timing skew via matched 4.5 ns t_PD, enabling reliable 100+ MHz bus operation.	Use Scenario: Hot-swappable module communication in programmable logic controller (PLC) backplanes where 2.5 V FPGA I/O must interface with 5 V I/O modules. IC Role / Device Role / Timing Role: Bus isolator and voltage translator with live-insertion capability and power-off high-Z protection. Use Value: Prevents bus contention during card insertion/removal and ensures signal integrity under noisy industrial EMI conditions.
Server DIMM Buffer Interface	Test Equipment Signal Routing
Use Scenario: Isolating and translating control/data signals between 2.5 V DDR memory controller and 5 V presence-detect or SPD EEPROM circuits on SODIMM slots. IC Role / Device Role / Timing Role: Low-latency, bushold-enabled transceiver providing robust I²C/SMBus signal routing with no external biasing. Use Value: Reduces component count by integrating bushold and 5V tolerance-improving reliability and simplifying layout near memory sockets.	Use Scenario: Reconfigurable signal path switching in automated test equipment (ATE), where 32-bit parallel stimulus/response lines must adapt to DUTs with varying I/O voltage standards. IC Role / Device Role / Timing Role: Programmable bidirectional bus switch supporting dynamic voltage domain translation and direction reversal under firmware control. Use Value: Enables single-hardware platform to test both 2.5 V and 5 V devices without hardware rework or adapter boards.

Memory Expansion Interface

Industrial Backplane Interconnect

Use Scenario: Extending 32-bit data/address bus between a 3.3 V microcontroller and legacy 5 V SRAM or Flash memory modules.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver managing data flow direction and isolation between mismatched voltage domains.

Use Value: Eliminates discrete level shifters and reduces timing skew via matched 4.5 ns t_PD, enabling reliable 100+ MHz bus operation.

Use Scenario: Hot-swappable module communication in programmable logic controller (PLC) backplanes where 2.5 V FPGA I/O must interface with 5 V I/O modules.

IC Role / Device Role / Timing Role: Bus isolator and voltage translator with live-insertion capability and power-off high-Z protection.

Use Value: Prevents bus contention during card insertion/removal and ensures signal integrity under noisy industrial EMI conditions.

Server DIMM Buffer Interface

Test Equipment Signal Routing

Use Scenario: Isolating and translating control/data signals between 2.5 V DDR memory controller and 5 V presence-detect or SPD EEPROM circuits on SODIMM slots.

IC Role / Device Role / Timing Role: Low-latency, bushold-enabled transceiver providing robust I²C/SMBus signal routing with no external biasing.

Use Value: Reduces component count by integrating bushold and 5V tolerance-improving reliability and simplifying layout near memory sockets.

Use Scenario: Reconfigurable signal path switching in automated test equipment (ATE), where 32-bit parallel stimulus/response lines must adapt to DUTs with varying I/O voltage standards.

IC Role / Device Role / Timing Role: Programmable bidirectional bus switch supporting dynamic voltage domain translation and direction reversal under firmware control.

Use Value: Enables single-hardware platform to test both 2.5 V and 5 V devices without hardware rework or adapter boards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ALVCH32245	Higher speed (t_PD ≤ 3.4 ns @ 3.3 V), lower V_CC min (2.0 V), but no bushold and reduced ESD rating (HBM = 2000 V → 1500 V).	Lacks bushold-requires external pull resistors on unused inputs; better suited for speed-critical, fully routed designs with no floating nodes.	Select when maximum speed and lowest V_CC are prioritized over input biasing simplicity and EMI robustness.
SN74LVC3245APM	Same 32-bit bidirectional function, 5V-tolerant I/O, and 2.3–3.6 V range-but uses TSSOP-56 package, no bushold, and higher ICC (max 40 µA vs. 20 µA).	Through-hole or surface-mount alternative for prototyping or low-volume boards where FBGA assembly is unavailable.	Choose for manual assembly, breadboarding, or legacy PCBs lacking FBGA reflow capability-accepting trade-offs in density and power efficiency.

Compared with 74ALVCH32245 and SN74LVC3245APM, the 74LCXH32245 uniquely combines bushold, FBGA96A compactness, and patented noise suppression-making it optimal for space-constrained, high-reliability industrial and telecom backplane designs requiring zero-bias input management and live insertion.

Availability

74LCXH32245 is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial backplane interconnects, and server DIMM buffer applications requiring stable component supply, long-term lifecycle support, and consistent FBGA packaging.

Supply support for 74LCXH32245 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

Fairchild Semiconductor was a U.S.-based designer and manufacturer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The 74LCXH32245 belongs to the LCXH low-voltage CMOS logic family, engineered for high-speed, low-power 32-bit bus interfacing in mixed-voltage systems-specifically targeting memory subsystems, backplane bridges, and hot-pluggable module interfaces.

FAQ

What is the operating V_CC range for the 74LCXH32245?

The 74LCXH32245 operates across a V_CC range of 2.3 V to 3.6 V, supporting both 2.5 V and 3.3 V logic domains. This range is validated per the Recommended Operating Conditions table in the official datasheet, with guaranteed performance including propagation delay ≤4.5 ns and output drive ±24 mA at 3.0–3.6 V. Operation below 2.3 V is not specified and may result in undefined logic behavior or increased ICC.

Does the 74LCXH32245 require external pull-up or pull-down resistors on unused inputs?

No, the 74LCXH32245 does not require external pull-up or pull-down resistors on unused inputs due to its integrated bushold circuitry. The bushold feature actively maintains the last-valid logic state with ±45 µA minimum hold current at V_CC = 2.3 V, as confirmed in the DC Electrical Characteristics table. This eliminates BOM cost and PCB space typically needed for biasing resistors.

What package type is used for the 74LCXH32245G variant?

The 74LCXH32245G is packaged in a 96-ball Fine-Pitch Ball Grid Array (FBGA), designated as package number BGA96A per Fairchild's ordering documentation. It complies with JEDEC MO-205, measures 5.5 mm × 5.5 mm, and uses 0.8 mm ball pitch-optimized for high-density routing and thermal performance in compact industrial and telecom PCBs.

Can the 74LCXH32245 be used in hot-swap applications?

Yes, the 74LCXH32245 supports live insertion and withdrawal per datasheet Note 1. Its power-off high-impedance I/O, 5V-tolerant inputs/outputs, and controlled enable sequencing (via OE pull-up) prevent bus contention and back-driving during hot-plug events-making it suitable for modular backplanes, carrier cards, and field-replaceable units in telecom and industrial systems.

How many independent control groups does the 74LCXH32245 have?

The 74LCXH32245 has four independent control groups, each managing an 8-bit segment (A0–A7/B0–B7, A8–A15/B8–B15, A16–A23/B16–B23, A24–A31/B24–B31). Each group has dedicated T/Rn and OEn inputs, allowing flexible configuration-from full 32-bit operation (all controls tied) to isolated 8-bit channel usage-verified in the Truth Tables and Pin Descriptions sections of the datasheet.

74LCXH32245G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXH

Package/Case:: 96-LFBGA

Packaging:: Tray

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 4

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 96-FBGA (13.5x5.5)

74LCXH32245G FAQ

1.How can I place an order for 74LCXH32245G through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXH32245G 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 74LCXH32245G reliable?

The price and inventory of 74LCXH32245G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXH32245G is usually 5 days.

3.What payment methods are accepted for 74LCXH32245G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXH32245G transactions.

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4.How is shipping managed for 74LCXH32245G?

74LCXH32245G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXH32245G 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 74LCXH32245G?

For technical support, including 74LCXH32245G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXH32245G requirements.

6.How does Aetrix verify that 74LCXH32245G is sourced from the original manufacturer or authorized distributors?

All 74LCXH32245G 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 74LCXH32245G meets industry standards.

7.What is the process for return or replacement of 74LCXH32245G?

All 74LCXH32245G units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXH32245G, 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 74LCXH32245G part is unused and in its original packaging.

Return procedure for 74LCXH32245G:

1.Submit a request within 90 days.

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

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