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onsemi 74LCX32245GX
- Part No.:
- 74LCX32245GX
- Manufacturer:
- onsemi
- Package:
- 96-LFBGA
- Datasheet:
-
74LCX32245GX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 96FBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,991
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Product details
Overview
74LCX32245GX from Fairchild Semiconductor is a low-voltage 32-bit bidirectional transceiver with 5V-tolerant I/O, designed for bus interface between 2.5V/3.3V logic domains and 5V systems. It features byte-level direction control (T/R), independent output enable (OE), 4.5 ns max propagation delay at 3.3V, ±24 mA drive strength, and FBGA96A packaging. It enables high-speed data transfer in memory expansion and backplane interconnect applications.
For engineers reviewing the 74LCX32245GX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance on all I/Os, 2.3–3.6V VCC operation, 3-STATE bidirectional buffering per byte, FBGA96A mechanical compatibility, and live insertion support without power sequencing constraints.
Technical Context
The 74LCX32245GX implements four independent 8-bit bidirectional transceiver sections, each with dedicated T/R and OE inputs-enabling selective byte-direction control or full 32-bit unidirectional/bidirectional operation. Its advanced CMOS process delivers high-speed switching while maintaining low ICC (20 µA max quiescent current) and robust ESD immunity (>2000V HBM).
All 64 I/O pins (A0–A31, B0–B31) are 5V tolerant across 2.3–3.6V VCC, supporting mixed-voltage system interfacing without level shifters. The device enters power-down high-impedance state when VCC = 0V, with IOFF leakage ≤10 µA at VI/VO = 5.5V-critical for hot-swap and partial-power-down architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V core logic rails with guaranteed timing and DC specs. |
| tPD Max | 4.5 ns at VCC = 3.3V, CL = 50 pF - enables >200 MHz bus operation in synchronous interfaces. |
| I/O Drive | ±24 mA at VCC = 3.0V - drives standard TTL loads and short stubs on multi-drop buses without external buffers. |
| 5V Tolerance | Inputs and outputs withstand 0V to 5.5V - eliminates need for external voltage translators when interfacing to 5V peripherals. |
| ICC Quiescent | 20 µA max - reduces standby power in battery-backed or always-on subsystems. |
| IOFF Leakage | ≤10 µA at VI/VO = 5.5V, VCC = 0V - ensures signal integrity during hot-plug events and power-gated modes. |
| ESD Rating | Human Body Model >2000V - meets industrial-grade robustness requirements without additional protection circuitry. |
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. Pin assignments follow top-thru-view layout with 4 ground balls, 4 VCC balls, and symmetric A/B I/O distribution across 16 rows (A–T) and 6 columns (1–6).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A31 | Side A bidirectional I/O | 32-bit port A connects to local low-voltage bus (e.g., ASIC or FPGA side); supports input or 3-STATE output based on T/Rn and OEn. |
| B0–B31 | Side B bidirectional I/O | 32-bit port B interfaces to external 5V-tolerant subsystem (e.g., legacy memory or peripheral bus); electrically isolated from A-side by transceiver core. |
| OE1–OE4 | Byte Output Enable (active LOW) | Four independent enables allow selective 8-bit isolation-e.g., disable A8–A15/B8–B15 while keeping other bytes active for partial bus arbitration. |
| T/R1–T/R4 | Byte Transmit/Receive Control | Determines data flow direction per 8-bit byte: LOW = B→A, HIGH = A→B; enables simultaneous mixed-direction operation across bytes. |
| VCC (×4) | Power supply | Four dedicated VCC balls reduce IR drop and improve noise margin; must be decoupled locally with 0.1 µF ceramic capacitors. |
| GND (×4) | Ground reference | Four GND balls provide low-inductance return paths for high-speed switching currents; critical for EMI control and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Operates safely with 0–5.5V signals on all A/B pins regardless of VCC (2.3–3.6V), eliminating external level shifters in mixed-voltage designs. |
| Byte-selectable control | Four independent OE/T/R pairs allow granular bus partitioning-e.g., isolate memory-mapped I/O while keeping DMA channels active. |
| Live insertion support | High-impedance inputs/outputs during power-up/down prevent bus contention; OE pull-up resistor guidance ensures safe initialization without sequenced supplies. |
| Noise/EMI reduction | Patented circuitry limits simultaneous switching noise (SSN), reducing ground bounce and radiated emissions in dense PCB layouts. |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD78 - prevents destructive latch-up under transient overvoltage or ESD stress in industrial environments. |
Applications
| Memory Expansion Interface | Backplane Data Bus |
|---|---|
|
Use Scenario: Interfacing a 3.3V FPGA to legacy 5V SRAM or Flash memory modules on a daughterboard. IC Role / Device Role / Timing Role: Bidirectional data transceiver providing voltage translation and bus isolation between core logic and memory subsystem. Use Value: Eliminates discrete level shifters while maintaining 4.5 ns propagation delay-preserving timing margins in 100+ MHz memory read/write cycles. |
Use Scenario: Connecting multiple 2.5V/3.3V processor cards to a shared 5V backplane in modular telecom equipment. IC Role / Device Role / Timing Role: Hot-swappable bus buffer enabling live card insertion/removal without disrupting backplane communication. Use Value: Power-down high-impedance mode and IOFF leakage ≤10 µA prevent signal corruption during card reseating or partial power loss. |
| Industrial PLC I/O Module | Test Equipment Signal Routing |
|
Use Scenario: Isolating field-side 5V sensor/actuator signals from 3.3V controller logic in programmable logic controller modules. IC Role / Device Role / Timing Role: Robust bidirectional interface with ±24 mA drive and >2000V HBM ESD rating for harsh factory-floor environments. Use Value: Latch-up immunity >500 mA and 5V tolerance ensure reliable operation despite induced transients on long I/O cables. |
Use Scenario: Reconfigurable signal path routing in automated test equipment where DUT interfaces vary between 2.5V, 3.3V, and 5V standards. IC Role / Device Role / Timing Role: Programmable bus transceiver allowing software-defined direction and enable control per byte via microcontroller GPIOs. Use Value: Four independent OE/T/R controls enable dynamic reconfiguration of 32-bit data paths without hardware changes or multiplexer latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC3245APM | Same 32-bit bidirectional function, but uses TSSOP-56 package (not FBGA); 5V-tolerant I/O only up to 3.6V VCC; tPD = 5.2 ns max at 3.3V. | Preferred for prototyping or low-volume PCBs where surface-mount land pattern flexibility matters more than density or thermal performance. | Select when FBGA assembly capability is unavailable or when board-level test access to individual pins is required. |
| 74ALVC164245PAG | 16-bit version (dual 8-bit), TQFP-48; identical 2.3–3.6V VCC and 5V tolerance; tPD = 4.2 ns max; lacks byte-level OE/T/R independence (only two global controls). | Suitable for space-constrained 16-bit buses where full 32-bit width and per-byte control are unnecessary. | Choose for cost-sensitive 16-bit applications or when footprint compatibility with legacy ALVC designs is mandatory. |
Compared with SN74LVC3245APM and 74ALVC164245PAG, the 74LCX32245GX offers superior density via FBGA96A, true per-byte direction/enable granularity, and lower propagation delay-making it optimal for high-speed, high-density embedded bus bridging where layout area and timing closure are critical.
Availability
74LCX32245GX is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial PLC I/O modules, backplane data buses, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for 74LCX32245GX 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 leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic families remain widely deployed in industrial and telecom infrastructure.
The LCX family-including the 74LCX32245GX-was engineered for low-voltage, high-speed bus interfacing with 5V tolerance, targeting applications where power efficiency, noise immunity, and mixed-voltage interoperability were essential design constraints.
FAQ
What is the maximum operating temperature range for the 74LCX32245GX?
The 74LCX32245GX is rated for free-air operating temperatures from −40°C to +85°C. This industrial-grade range ensures reliable operation in demanding environments such as factory automation controllers, outdoor telecom base stations, and transportation electronics-without derating or forced cooling. All AC and DC specifications in the datasheet are guaranteed across this full range.
Does the 74LCX32245GX require external pull-up resistors on OE pins?
Yes-the 74LCX32245GX OE inputs are active LOW and must be pulled HIGH during power-up to ensure outputs remain in high-impedance state until firmware initializes control logic. Fairchild recommends a pull-up resistor tied to VCC, sized according to driver current capability; typical values range from 4.7 kΩ to 10 kΩ for standard CMOS drivers.
Can the 74LCX32245GX operate with a 2.5V supply voltage?
Yes-the 74LCX32245GX is fully specified for VCC = 2.5V ± 0.2V, delivering tPD ≤ 5.4 ns (max), VOL ≤ 0.6V at 8 mA sink, and VIH ≥ 1.7V. Its 2.3–3.6V operating window makes it compatible with both 2.5V and 3.3V system rails, unlike older LVT or LV families limited to single-supply voltages.
How many independent control groups does the 74LCX32245GX support?
The 74LCX32245GX supports four independent control groups: OE1/T/R1 for A0–A7/B0–B7, OE2/T/R2 for A8–A15/B8–B15, OE3/T/R3 for A16–A23/B16–B23, and OE4/T/R4 for A24–A31/B24–B31. This allows concurrent bidirectional operation across different byte lanes-e.g., reading from one memory region while writing to another.
Is the 74LCX32245GX pin-compatible with other LCX-family transceivers?
No-the 74LCX32245GX uses the BGA96A package (96-ball FBGA), which is not pin-compatible with TSSOP, SSOP, or TQFP variants of similar LCX transceivers (e.g., 74LCX16245). Pin mapping, ball pitch (0.8 mm), and thermal pad configuration are unique to this package; migration requires PCB redesign and layout validation.
74LCX32245GX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 96-LFBGA
- Packaging:
- Tape & Reel (TR)
- 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)
74LCX32245GX FAQ
1.How can I place an order for 74LCX32245GX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX32245GX 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 74LCX32245GX reliable?
The price and inventory of 74LCX32245GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX32245GX is usually 5 days.
3.What payment methods are accepted for 74LCX32245GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX32245GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX32245GX?
74LCX32245GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX32245GX 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 74LCX32245GX?
For technical support, including 74LCX32245GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX32245GX requirements.
6.How does Aetrix verify that 74LCX32245GX is sourced from the original manufacturer or authorized distributors?
All 74LCX32245GX 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 74LCX32245GX meets industry standards.
7.What is the process for return or replacement of 74LCX32245GX?
All 74LCX32245GX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX32245GX, 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 74LCX32245GX part is unused and in its original packaging.
Return procedure for 74LCX32245GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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