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

onsemi 74LCXH16245GX

Name: 74LCXH16245GX
Brand: onsemi
SKU: 74LCXH16245GX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXH16245GX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 54-LFBGA

Datasheet:: 74LCXH16245GX.pdf

Description:: IC TXRX NON-INVERT 3.6V 54FBGA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LCXH16245GX from Fairchild Semiconductor is a low-voltage 16-bit bidirectional transceiver with bushold inputs, designed for bus interface between 2.5V/3.3V domains and 5V signal environments. It features byte-level control (two independent 8-bit sections), 3-STATE outputs, and active bushold circuitry eliminating external pull-up resistors. Typical applications include memory address/data bus buffering in mixed-voltage embedded systems.

For engineers reviewing the 74LCXH16245GX datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.3V–3.6V V_CC range, 4.5 ns max propagation delay at 3.3V, ±24 mA output drive, bushold input retention, and FBGA54/TSSOP48 package compatibility.

Technical Context

The 74LCXH16245GX implements two independent 8-bit bidirectional data paths, each controlled by dedicated OE and T/R signals-enabling selective 8-bit or full 16-bit operation. Its bushold circuitry actively maintains valid logic states on floating A/B-side inputs without external biasing, reducing BOM count and layout complexity.

It operates across 2.3V–3.6V supply rails while tolerating 5V-tolerant inputs, supporting mixed-voltage system interconnects. Propagation delay is specified at 4.5 ns (max) under 3.3V/50 pF conditions, with output skew ≤1.0 ns and power-down high-impedance outputs meeting JESD78 latch-up requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V to 3.6V - supports dual-rail 2.5V and 3.3V logic domains with 5V-tolerant inputs
t_PD Max	4.5 ns at V_CC = 3.3V, CL = 50 pF - enables high-speed bus transfer up to ~220 MHz effective rate
I_OH/I_OL	±24 mA at V_CC = 3.0V - drives standard TTL loads and multiple CMOS inputs without fanout limitation
Bushold Current	45 µA min hold current at VIN = 0.7V (2.3V V_CC) - sustains stable logic level on unconnected inputs
IOZ Leakage	±5.0 µA max at V_CC = 2.3–3.6V - ensures minimal leakage in 3-STATE mode during power sequencing
ESD Rating	HBM ≥2000V, MM ≥200V - meets industrial-grade ESD robustness for board-level handling

Pinout & Package

74LCXH16245GX is supplied in 54-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 orientation per datasheet Figure 2.

Pin/Terminal	Circuit Role	Design Meaning
A0–A15	Side A I/O with bushold	Bidirectional data port (byte 0: A0–A7; byte 1: A8–A15), retains state when floating
B0–B15	Side B I/O with bushold	Bidirectional data port (byte 0: B0–B7; byte 1: B8–B15), electrically isolated from A-side when OE active
OE1, OE2	Output enable (active-low)	Disables both A/B ports to high-impedance; separate controls allow independent byte gating
T/R1, T/R2	Transmit/receive direction control	Low = B→A data flow; High = A→B data flow; defines real-time bus direction per byte
V_CC	Power supply	Two V_CC balls (pins C3, C4, G3, G4) - decoupling required per JEDEC MO-205 layout guidelines
GND	Ground	Four GND balls (pins D3, D4, E3, E4) - low-inductance return path for switching currents

Key Features

Feature	Design Value
Bushold inputs	Eliminates need for 32 external pull-up resistors across A/B ports, reducing PCB area and assembly cost
Byte-selectable control	Independent OE/T/R per 8-bit byte enables partial bus isolation - e.g., retain A0–A7 active while tri-stating A8–A15
5V-tolerant inputs	Accepts 0–5.5V input signals at VI while powered from 2.3–3.6V V_CC, enabling legacy interface bridging
Low dynamic noise	Patented EMI reduction circuitry limits simultaneous switching noise, easing signal integrity validation
Power-down high-Z	Outputs enter high-impedance state during V_CC ramp-up/down, preventing backdrive and bus contention

Applications

Memory Subsystem Interface	Processor Bus Expansion
Use Scenario: Interfacing a 3.3V microcontroller data bus to 2.5V SRAM or flash memory with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing time-multiplexed AD bus direction under processor control. Use Value: Bushold prevents floating bus states during address latching windows; 4.5 ns t_PD supports >100 MHz bus cycles without wait states.	Use Scenario: Extending a 16-bit ISA-like peripheral bus from a 3.3V SoC to legacy 5V I/O cards. IC Role / Device Role / Timing Role: Voltage-translating bus buffer isolating core logic from noisy 5V peripheral signaling. Use Value: 5V-tolerant inputs accept legacy card outputs directly; separate byte enables allow hot-plug detection on one byte while maintaining main bus activity.
FPGA I/O Bridging	Mixed-Voltage Test Fixture
Use Scenario: Connecting FPGA I/O banks operating at 2.5V to external test equipment running at 3.3V. IC Role / Device Role / Timing Role: Direction-controlled bidirectional bridge synchronizing data flow between FPGA and external logic analyzer or pattern generator. Use Value: Independent T/R control per byte allows FPGA to initiate reads/writes without external direction arbitration logic; bushold holds FPGA pins safe during configuration reset.	Use Scenario: Automated test fixture verifying voltage translation and timing margins of mixed-supply ASIC prototypes. IC Role / Device Role / Timing Role: Reference transceiver providing known-delay, bushold-stabilized interface between tester channels and DUT power domains. Use Value: Guaranteed 4.5 ns t_PD and ≤1 ns skew enable precise setup/hold margin measurement; FBGA package supports high-density probe access.

Memory Subsystem Interface

Processor Bus Expansion

Use Scenario: Interfacing a 3.3V microcontroller data bus to 2.5V SRAM or flash memory with shared address/data lines.

IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing time-multiplexed AD bus direction under processor control.

Use Value: Bushold prevents floating bus states during address latching windows; 4.5 ns t_PD supports >100 MHz bus cycles without wait states.

Use Scenario: Extending a 16-bit ISA-like peripheral bus from a 3.3V SoC to legacy 5V I/O cards.

IC Role / Device Role / Timing Role: Voltage-translating bus buffer isolating core logic from noisy 5V peripheral signaling.

Use Value: 5V-tolerant inputs accept legacy card outputs directly; separate byte enables allow hot-plug detection on one byte while maintaining main bus activity.

FPGA I/O Bridging

Mixed-Voltage Test Fixture

Use Scenario: Connecting FPGA I/O banks operating at 2.5V to external test equipment running at 3.3V.

IC Role / Device Role / Timing Role: Direction-controlled bidirectional bridge synchronizing data flow between FPGA and external logic analyzer or pattern generator.

Use Value: Independent T/R control per byte allows FPGA to initiate reads/writes without external direction arbitration logic; bushold holds FPGA pins safe during configuration reset.

Use Scenario: Automated test fixture verifying voltage translation and timing margins of mixed-supply ASIC prototypes.

IC Role / Device Role / Timing Role: Reference transceiver providing known-delay, bushold-stabilized interface between tester channels and DUT power domains.

Use Value: Guaranteed 4.5 ns t_PD and ≤1 ns skew enable precise setup/hold margin measurement; FBGA package supports high-density probe access.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ALVC16245QTR	No bushold; requires external pull-ups; 3.6V V_CC max; 3.5 ns t_PD at 3.3V	Lacks floating-input retention; better suited for fully driven buses with no risk of undriven states	Select when bushold is unnecessary and faster propagation is prioritized over input robustness
SN74LVC16245ADGGR	Same bushold function; 3.6V V_CC max; 5.8 ns t_PD at 3.3V; TSSOP-48 only	Slower timing but broader vendor support and longer production lifecycle	Select when long-term availability and second-source assurance outweigh speed requirements

Compared with 74LCXH16245GX, the 74ALVC16245QTR offers higher speed but sacrifices bushold protection, while the SN74LVC16245ADGGR provides identical bushold functionality with greater supply margin and extended lifecycle-making it preferable for new designs requiring long-term sourcing stability.

Availability

74LCXH16245GX is available at Aetrix Electronics and suitable for memory subsystem interfaces, processor bus expansion, FPGA I/O bridging, and mixed-voltage test fixtures requiring stable component supply and FBGA packaging.

Supply support for 74LCXH16245GX 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 analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016. Known for high-performance logic, power management, and interface solutions.

The 74LCXH16245GX belongs to Fairchild's LCX low-voltage CMOS logic family, engineered for mixed-signal embedded systems requiring voltage translation, noise immunity, and bus integrity across 2.5V/3.3V/5V domains.

FAQ

What is the maximum operating voltage for the 74LCXH16245GX?

The 74LCXH16245GX has a recommended V_CC operating range of 2.3V to 3.6V. Absolute maximum V_CC is 7.0V, but operation outside 2.3–3.6V voids parametric guarantees. Input tolerance extends to 5.5V, allowing safe interfacing with 5V signals while powered at 3.3V. The 74LCXH16245GX must not be operated continuously above 3.6V V_CC to ensure reliability and specification compliance.

Does the 74LCXH16245GX require external pull-up resistors on its I/O pins?

No, the 74LCXH16245GX does not require external pull-up resistors due to integrated bushold circuitry on all A0–A15 and B0–B15 inputs. This feature actively maintains the last-valid logic state on floating or undriven pins, eliminating bus contention risks during power-up, reset, or idle periods. The 74LCXH16245GX bushold current is specified at 45 µA minimum (2.3V V_CC), ensuring robust state retention without added components.

What is the pin-compatible package option for the 74LCXH16245GX?

The 74LCXH16245GX is packaged exclusively in 54-ball FBGA (BGA54A). A pin-compatible TSSOP-48 variant exists as 74LCXH16245MTD, but it is not the same orderable part number and uses different pin mapping and thermal characteristics. The 74LCXH16245GX itself is not offered in TSSOP; substituting packages requires redesign due to differing ball/pad layouts, solder reflow profiles, and signal integrity behavior.

How does the byte-control architecture of the 74LCXH16245GX improve system design?

The 74LCXH16245GX implements two independent 8-bit sections (A0–A7/B0–B7 and A8–A15/B8–B15), each with dedicated OE1/OE2 and T/R1/T/R2 controls. This allows selective activation-for example, holding A8–A15 in high-Z while transferring A0–A7-reducing bus contention and enabling partial updates. The 74LCXH16245GX byte control eliminates need for additional logic gates or multiplexers in segmented bus architectures.

Is the 74LCXH16245GX suitable for automotive applications?

The 74LCXH16245GX is rated for industrial temperature range (–40°C to +85°C) and meets JESD78 latch-up and HBM/MM ESD standards, but it is not AEC-Q100 qualified and lacks automotive-specific reliability testing or PPAP documentation. While functionally capable in non-safety-critical automotive subsystems (e.g., infotainment debug interfaces), the 74LCXH16245GX is not approved for safety-related or powertrain applications where automotive-grade qualification is mandatory.

74LCXH16245GX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXH

Package/Case:: 54-LFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

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:: 54-FBGA (5.5x8)

74LCXH16245GX FAQ

1.How can I place an order for 74LCXH16245GX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXH16245GX 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 74LCXH16245GX reliable?

The price and inventory of 74LCXH16245GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXH16245GX is usually 5 days.

3.What payment methods are accepted for 74LCXH16245GX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXH16245GX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCXH16245GX?

74LCXH16245GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXH16245GX 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 74LCXH16245GX?

For technical support, including 74LCXH16245GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXH16245GX requirements.

6.How does Aetrix verify that 74LCXH16245GX is sourced from the original manufacturer or authorized distributors?

All 74LCXH16245GX 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 74LCXH16245GX meets industry standards.

7.What is the process for return or replacement of 74LCXH16245GX?

All 74LCXH16245GX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXH16245GX, 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 74LCXH16245GX part is unused and in its original packaging.

Return procedure for 74LCXH16245GX:

1.Submit a request within 90 days.

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

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