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

STMicroelectronics 74LCXHR162245TTR

Name: 74LCXHR162245TTR
Brand: STMicroelectronics
SKU: 74LCXHR162245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXHR162245TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LCXHR162245TTR.pdf

Description:: IC TXRX NON-INVERT 3.6V 48TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:3,031

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Product details

Overview

74LCXHR162245TTR from STMicroelectronics is a low-voltage CMOS 16-bit bus transceiver with 3-state outputs, 5V-tolerant I/O, symmetrical ±12 mA drive at VCC = 3V, 4.7 ns max propagation delay, and bus-hold on all data pins. It enables bidirectional asynchronous data transfer between 3.3V buses interfacing with 5V logic, commonly used in PCI-compliant backplane interfaces and memory expansion modules.

For engineers reviewing the 74LCXHR162245TTR datasheet, 74LCXHR162245TTR pinout, 74LCXHR162245TTR application, or 74LCXHR162245TTR equivalent, key selection criteria include 5V tolerance on all I/Os, balanced tPLH/tPHL timing, bus-hold elimination of external resistors, and TSSOP-48 packaging for high-density PCB layouts.

Technical Context

This transceiver implements dual 8-bit bidirectional data paths controlled by independent DIR and G inputs per side, supporting simultaneous A→B and B→A communication when enabled. Directional control is synchronous with enable assertion, and output disable ensures high-impedance isolation with power-down protection on all I/Os.

Each I/O incorporates integrated 26Ω series termination to suppress overshoot/undershoot, and internal bus-hold circuitry maintains last-valid logic state without external biasing. The device meets PCI bus voltage levels at 12 mA sink/source and exceeds 500 mA latch-up immunity per JESD17.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Operating Range	2.0 V to 3.6 V - supports 3.3V systems with 1.5V data retention during sleep
tPD Max	4.7 ns at VCC = 3.0–3.6 V - enables >200 MHz bus operation with tight timing margins
IOL / IOH Min	±12 mA at VCC = 3.0–3.6 V - drives standard PCI loads without external buffers
5V Tolerance	Inputs and outputs withstand 0–5.5 V - allows safe interfacing with legacy 5V peripherals
Bus Hold	Active on all A/B-side data pins - eliminates need for 10 kΩ pull-up/down resistors
ESD Rating	HBM > 2000 V, MM > 200 V - meets industrial handling requirements without additional protection
CIN / COUT	7 pF / 8 pF - minimizes capacitive loading on high-speed traces

Pinout & Package

TSSOP-48 package (4.4 mm × 12.5 mm body, 0.5 mm pitch), thermally enhanced for low-power 3.3V operation with exposed pad not connected internally.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	DIR	Direction control for respective 8-bit bus side - HIGH enables B→A, LOW enables A→B
2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23	1B1–1B8, 2B1–2B8	B-side bidirectional data I/O with bus-hold - connects to peripheral or expansion bus
25, 48	2G, 1G	Output enable for B-side and A-side - LOW enables drivers, HIGH forces 3-state
26–27, 29–30, 32–33, 35–36, 38–40, 41–43, 44–46, 47	2A1–2A8, 1A1–1A8	A-side bidirectional data I/O with bus-hold - connects to host CPU or controller bus
4, 10, 15, 21, 28, 34, 39, 45	GND	Eight dedicated ground pins - reduces ground bounce across 16-bit data path
7, 18, 31, 42	VCC	Four dedicated supply pins - lowers IR drop and improves noise immunity

Key Features

Feature	Design Value
5V-tolerant I/O	Supports mixed-voltage system integration without level shifters or clamping diodes
Symmetrical output drive	±12 mA at VCC = 3V ensures matched rise/fall times and reduced signal skew
Integrated 26Ω series termination	Reduces transmission-line reflections on FR-4 PCBs up to 15 cm trace length
Bus-hold on all data pins	Maintains valid logic state during tri-state transitions, preventing floating-bus metastability
Power-down I/O protection	Prevents current backflow when VCC = 0V, enabling hot-swap capability in modular systems

Applications

PCI Bus Interface

Memory Expansion Module

Use Scenario: Interfacing a 3.3V microcontroller to a 5V PCI slot for add-in card communication.

IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing address/data strobes with <4.7 ns propagation delay.

Use Value: Eliminates discrete level shifters while meeting PCI electrical specs at 12 mA drive strength.

Use Scenario: Extending DRAM or Flash memory bus between baseboard and mezzanine module.

IC Role / Device Role / Timing Role: Isolating and buffering 16-bit parallel memory bus with bus-hold maintaining data integrity during reconfiguration.

Use Value: Prevents floating bus states during hot-plug events and reduces BOM count by removing eight pull-up resistors.

Industrial Backplane Interface

Legacy System Upgrader

Use Scenario: Connecting modern 3.3V FPGA I/O banks to legacy 5V backplane signals in programmable logic controllers.

IC Role / Device Role / Timing Role: Asynchronous bidirectional transceiver with independent DIR/G controls per 8-bit segment.

Use Value: Enables deterministic direction switching without clock synchronization, critical for deterministic I/O scanning cycles.

Use Scenario: Retrofitting 5V ISA or VMEbus systems with low-power 3.3V peripherals.

IC Role / Device Role / Timing Role: Voltage-tolerant bus interface preserving signal integrity across mixed-supply domains.

Use Value: Maintains compatibility with existing 5V timing margins while reducing system power by 40% versus 5V-only alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bidirectional bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC162245DGGR	Lower drive (±24 mA), no built-in bus-hold, requires external resistors	Higher speed (tPD = 3.9 ns) but lacks 5V tolerance on outputs	Select when higher drive and lower propagation delay are prioritized over 5V output tolerance and bus-hold integration
74ALVCH162245PAG	Wider VCC range (1.65–3.6 V), same 5V tolerance, no bus-hold	Compatible with 1.8V core logic; requires external biasing for floating inputs	Select for multi-voltage domain designs where 1.8V compatibility outweighs bus-hold convenience

Compared with SN74LVC162245DGGR and 74ALVCH162245PAG, the 74LCXHR162245TTR uniquely combines 5V-tolerant outputs, integrated bus-hold, and symmetrical ±12 mA drive in a single TSSOP-48 package-reducing layout complexity and component count in space-constrained 3.3V-to-5V bridging applications.

Availability

74LCXHR162245TTR is available at Aetrix Electronics and suitable for PCI bus interfaces, memory expansion modules, industrial backplane interconnects, and legacy system upgraders requiring stable component supply and long-term obsolescence management.

Supply support for 74LCXHR162245TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LCX series targets low-voltage, high-speed logic applications operating at 3.3V with 5V-tolerant I/O, specifically engineered for seamless integration between emerging low-power logic and legacy 5V infrastructure.

FAQ

Is 74LCXHR162245TTR pin-compatible with standard 74-series 16245 devices?

Yes, it is pin- and function-compatible with the 74 series 16245, including identical TSSOP-48 footprint and DIR/G control logic. However, it operates at 2.0–3.6 V VCC (not 5 V), and its I/Os are 5V-tolerant-enabling direct replacement in 3.3V systems interfacing with 5V buses without redesign.

Does this device require external pull-up or pull-down resistors on data lines?

No. Bus-hold circuitry is integrated on all A- and B-side data inputs/outputs, actively retaining the last valid logic state when inputs float. This eliminates the need for external 10 kΩ resistors, reducing BOM cost and PCB area in high-pin-count bus interfaces.

What is the maximum recommended trace length for reliable operation at 100 MHz?

With its integrated 26Ω series output resistance and 8 pF typical COUT, the device supports clean signal integrity on FR-4 PCBs up to 15 cm (6 inches) for point-to-point connections at 100 MHz, assuming 50 Ω characteristic impedance and proper termination at the receiver end.

Can 74LCXHR162245TTR be used in hot-swap applications?

Yes. Its power-down protection on inputs and outputs prevents back-driving when VCC = 0 V, and the 5V-tolerant I/O structure allows safe insertion into live 5V backplanes. Combined with high ESD immunity (>2000 V HBM), it meets industrial hot-swap reliability requirements.

74LCXHR162245TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LCXHR

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

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:: 12mA, 12mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74LCXHR162245TTR FAQ

1.How can I place an order for 74LCXHR162245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXHR162245TTR 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 74LCXHR162245TTR reliable?

The price and inventory of 74LCXHR162245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXHR162245TTR is usually 5 days.

3.What payment methods are accepted for 74LCXHR162245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXHR162245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCXHR162245TTR?

74LCXHR162245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXHR162245TTR 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 74LCXHR162245TTR?

For technical support, including 74LCXHR162245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXHR162245TTR requirements.

6.How does Aetrix verify that 74LCXHR162245TTR is sourced from the original manufacturer or authorized distributors?

All 74LCXHR162245TTR 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 74LCXHR162245TTR meets industry standards.

7.What is the process for return or replacement of 74LCXHR162245TTR?

All 74LCXHR162245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXHR162245TTR, 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 74LCXHR162245TTR part is unused and in its original packaging.

Return procedure for 74LCXHR162245TTR:

1.Submit a request within 90 days.

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

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