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Texas Instruments SN74LVCR2245APWT
- Part No.:
- SN74LVCR2245APWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCR2245APWT.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,250
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Product details
Overview
SN74LVCR2245APWT from Texas Instruments is an octal noninverting bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It supports mixed-voltage operation (5.5-V-tolerant inputs), features integrated 26-Ω output series resistors, achieves 6.3 ns max propagation delay at 3.3 V, and enables live insertion via Ioff protection - used in server backplane interconnects and industrial control I/O expansion.
For engineers reviewing the SN74LVCR2245APWT datasheet, SN74LVCR2245APWT pinout, SN74LVCR2245APWT application, or SN74LVCR2245APWT equivalent, key selection criteria include its 20-pin TSSOP package, direction-controlled dual-bus topology, 3.6-V absolute maximum input voltage tolerance, and guaranteed operation across –40°C to 125°C ambient temperature.
Technical Context
The SN74LVCR2245APWT implements a dual-rail CMOS transceiver architecture with independent DIR and OE controls. Its logic-level translation capability stems from overvoltage-tolerant input buffers that accept up to 5.5 V regardless of VCC (1.65–3.6 V), enabling seamless interfacing between 3.3-V microcontrollers and legacy 5-V peripherals.
Each of the eight A/B channel pairs operates as a bidirectional path governed by DIR polarity and enabled/disabled by OE. The device integrates on-die 26-Ω series termination on all outputs to suppress signal reflections without external components, while Ioff circuitry ensures zero current backflow during partial power-down states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into modern low-voltage digital systems including battery-powered IoT nodes. |
| Input Voltage Max | 5.5 V - Allows safe connection to 5-V logic without level-shifting circuitry, simplifying mixed-voltage board design. |
| tpd (Max) | 6.3 ns at 3.3 V - Supports high-speed data transfer up to ~150 MHz clock-equivalent rates in point-to-point bus applications. |
| Output Resistance | 26 Ω (integrated) - Eliminates need for external series resistors, reducing BOM count and PCB footprint for clean edge control. |
| Ioff Protection | Active at VCC = 0 V - Prevents damaging back-current flow when powered down, critical for hot-swap and modular system architectures. |
| Operating Temp | –40°C to 125°C - Qualified for under-hood automotive, industrial motor drives, and telecom infrastructure environments. |
| ESD Rating | 2000 V HBM - Meets JEDEC JS-001 requirements for robust handling in automated assembly and field service conditions. |
Pinout & Package
TSSOP-20 package (PW), body size 6.50 mm × 4.40 mm, 0.65-mm pitch, exposed pad optional, RoHS-compliant, moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A data flow - determines real-time bus direction without requiring separate transmit/receive lines. |
| 2–9 (A1–A8) | Port A I/O Terminals | Bidirectional data pins for first bus segment; tolerate 5.5-V inputs regardless of VCC setting. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O circuits; must be low-impedance and decoupled per layout guidelines. |
| 11–18 (B8–B1) | Port B I/O Terminals | Bidirectional data pins for second bus segment; electrically identical to A-side with same voltage tolerance and drive strength. |
| 19 (OE) | Output Enable Input | Low = enable transceiver; High = place all A/B outputs in high-impedance state - provides bus isolation and power sequencing control. |
| 20 (VCC) | Supply Voltage Input | Single 1.65–3.6-V supply powers entire device; requires local 0.1-μF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5.5-V-tolerant inputs with 1.65–3.6-V VCC allow direct interface between 3.3-V SoCs and 5-V sensors or legacy peripherals. |
| Integrated 26-Ω output series resistance | Reduces overshoot/undershoot on transmission lines, eliminating discrete termination resistors and associated layout complexity. |
| Ioff partial-power-down support | Prevents current backflow when VCC = 0 V, enabling safe insertion/removal in live backplanes and modular computing systems. |
| Wide temperature range | Specified from –40°C to +125°C ambient, supporting deployment in automotive engine control units and industrial PLCs. |
| Low ground bounce (VOLP < 0.8 V) | Minimizes noise coupling into shared ground planes during simultaneous switching, improving signal integrity in dense digital systems. |
Applications
| Server Backplane Interconnect | Industrial I/O Expansion Module |
|---|---|
Use Scenario: Bidirectional data routing between CPU module and peripheral mezzanine cards in 1U rack-mounted servers. IC Role / Device Role / Timing Role: Bus transceiver managing isolated communication paths between 3.3-V processor bus and 5-V legacy I/O cards. Use Value: Eliminates need for external level shifters and termination resistors, reducing layer count and component cost in high-density backplane designs. |
Use Scenario: Signal conditioning and voltage translation between programmable logic controller (PLC) mainboard and remote sensor/actuator modules. IC Role / Device Role / Timing Role: Isolating and translating control signals between 3.3-V FPGA-based controller and 5-V industrial fieldbus interfaces (e.g., RS-485 PHYs). Use Value: Enables hot-swap capability via Ioff, preventing bus contention during module replacement without system shutdown. |
| Wearable Health Sensor Hub | Network Switch Management Interface |
Use Scenario: Aggregating analog sensor data (ECG, SpO₂) from multiple 5-V front-end ICs into a low-power 1.8-V microcontroller subsystem. IC Role / Device Role / Timing Role: Level-translating octal bus interface synchronizing burst-mode sensor reads with MCU DMA transfers. Use Value: Achieves 6.3 ns tpd at 1.8 V, supporting sub-microsecond sampling coordination while maintaining ultra-low quiescent current (<10 μA). |
Use Scenario: Interfacing management microcontroller with multiple ASICs and PHYs in enterprise-grade Ethernet switches. IC Role / Device Role / Timing Role: Bidirectional configuration bus transceiver connecting 3.3-V management CPU to 5-V switch fabric controllers and PHY registers. Use Value: Integrated 26-Ω termination ensures clean signal edges across 10+ inch PCB traces, meeting IEEE 802.3 compliance for register access timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | No 5.5-V input tolerance; max VI = VCC + 0.5 V; lacks integrated 26-Ω termination. | Requires external series resistors and level-shifting for 5-V interfaces; unsuitable for hot-swap due to missing Ioff. | Select only for cost-sensitive, single-supply 3.3-V-only systems where mixed-voltage operation is unnecessary. |
| TXB0108 | Auto-direction sensing; no DIR pin; higher ICC (up to 80 μA); supports 1.2–3.6-V translation. | Eliminates direction control logic but introduces latency variability; not pin-compatible; limited drive strength (4 mA). | Prefer for space-constrained designs needing automatic bidirectional translation, but verify timing margins in high-speed synchronous buses. |
Compared with SN74LVC245A and TXB0108, the SN74LVCR2245APWT uniquely combines 5.5-V input tolerance, integrated termination, and Ioff in a pin-compatible TSSOP-20 package - making it optimal for robust, mixed-voltage industrial and telecom backplane interconnects where deterministic timing and hot-swap reliability are mandatory.
Availability
SN74LVCR2245APWT is available at Aetrix Electronics and suitable for server backplane interconnects, industrial I/O expansion modules, and wearable health sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCR2245APWT 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-reliability logic and interface solutions.
The SN74LVCR2245APWT belongs to TI's LVCR (Low-Voltage CMOS with Robustness) logic family, engineered specifically for mixed-voltage system interfacing, ESD resilience, and industrial-grade thermal performance.
FAQ
What is the maximum input voltage rating for SN74LVCR2245APWT?
The SN74LVCR2245APWT accepts input voltages up to 5.5 V on all A- and B-side pins, regardless of VCC setting (1.65–3.6 V). This overvoltage tolerance enables direct interfacing with 5-V logic without external level shifters, and is verified across the full operating temperature range (–40°C to 125°C) per TI's SCAS581N datasheet Section 7.1.
Does SN74LVCR2245APWT support hot-swap or live insertion?
Yes, SN74LVCR2245APWT supports live insertion via its Ioff feature: when VCC = 0 V, all I/O ports enter high-impedance state with leakage current limited to ±10 μA (Section 7.5), preventing damaging back-current flow. This allows safe module replacement in powered-backplane systems, provided OE is held high during insertion.
What is the purpose of the integrated 26-Ω resistor in SN74LVCR2245APWT?
The SN74LVCR2245APWT integrates a 26-Ω series resistor on each output to dampen signal reflections and reduce overshoot/undershoot on PCB traces. As confirmed in Section 1 Features and Section 9.3, this eliminates the need for external termination resistors, saving board space and simplifying layout for high-speed bus interconnects.
Can SN74LVCR2245APWT operate at 1.8 V supply voltage?
Yes, SN74LVCR2245APWT is fully specified for 1.65–3.6-V operation, including 1.8 V. At 1.8 V, typical propagation delay is 10.9 ns (Section 7.6), and output drive capability remains functional (IOL = 2 mA min at VOL ≤ 0.45 V). All electrical characteristics are guaranteed across this range per Recommended Operating Conditions (Section 7.3).
What package type is used for SN74LVCR2245APWT?
SN74LVCR2245APWT uses a 20-pin TSSOP (Thin Shrink Small Outline Package) with drawing code PW, body dimensions 6.50 mm × 4.40 mm, and 0.65-mm lead pitch. It is RoHS-compliant, green (low-halogen), and rated MSL Level-1 (unlimited floor life), as documented in TI's Package Option Addendum (Feb 2020).
SN74LVCR2245APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCR
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVCR2245APWT FAQ
1.How can I place an order for SN74LVCR2245APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCR2245APWT 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 SN74LVCR2245APWT reliable?
The price and inventory of SN74LVCR2245APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCR2245APWT is usually 5 days.
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Once your SN74LVCR2245APWT 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 SN74LVCR2245APWT?
For technical support, including SN74LVCR2245APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCR2245APWT requirements.
6.How does Aetrix verify that SN74LVCR2245APWT is sourced from the original manufacturer or authorized distributors?
All SN74LVCR2245APWT 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 SN74LVCR2245APWT meets industry standards.
7.What is the process for return or replacement of SN74LVCR2245APWT?
All SN74LVCR2245APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCR2245APWT, 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 SN74LVCR2245APWT part is unused and in its original packaging.
Return procedure for SN74LVCR2245APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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