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Texas Instruments SN74LVCR2245ARGYR
- Part No.:
- SN74LVCR2245ARGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LVCR2245ARGYR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
SN74LVCR2245ARGYR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between A and B buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5-V-tolerant inputs, delivers 6.3 ns max propagation delay at 3.3 V, integrates 26-Ω output series resistors, and supports Ioff for live insertion and partial-power-down protection - used in server backplanes and network switch control interfaces.
For engineers reviewing the SN74LVCR2245ARGYR datasheet, SN74LVCR2245ARGYR pinout, SN74LVCR2245ARGYR application, or SN74LVCR2245ARGYR equivalent, key selection criteria include voltage translation capability (3.3 V ↔ 5 V), guaranteed 3-state isolation under power sequencing, thermal performance in VQFN-20 (RθJA = 41.4°C/W), and compatibility with high-speed digital bus architectures requiring sub-7 ns timing.
Technical Context
This device implements a dual-directional 8-bit noninverting transceiver with independent DIR (direction) and OE (output enable) controls. Its logic-level translation capability stems from overvoltage-tolerant CMOS inputs rated up to 5.5 V while powered from 1.65–3.6 V VCC, enabling seamless interfacing between legacy 5-V peripherals and modern low-voltage microcontrollers.
The integrated 26-Ω series output resistance suppresses signal overshoot/undershoot without external termination, and the Ioff feature actively disables all I/Os when VCC = 0 V, preventing back-drive current during hot-swap or partial power-down - critical for industrial PLC backplane modules and telecom line-card designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables operation across LDO-regulated 1.8 V, 2.5 V, and 3.3 V domains without level shifters |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V logic outputs without clamping diodes or external resistors |
| Max tpd | 6.3 ns at VCC = 3.3 V, TA = 25°C - supports >100 MHz bus clocking with margin for trace delays |
| Output Series Resistance | 26 Ω (equivalent) - eliminates need for discrete series termination on PCB, reducing BOM count and layout area |
| Ioff Current | ±10 μA at VI/VO = 5.5 V, VCC = 0 V - ensures safe hot-plug operation and prevents damage during system power sequencing |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and telecom infrastructure environments |
| ESD Rating | 2000-V HBM, 1000-V CDM - meets JEDEC JESD22-A114 and JESD22-C101 for robust handling in manufacturing |
Pinout & Package
VQFN-20 (RGY) package: 4.50 mm × 3.50 mm body, 0.5-mm pitch, exposed thermal pad, RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCC, not input voltage |
| 2–9 (A1–A8) | Port A bidirectional I/O | Configurable as input or output depending on DIR state; 5.5-V tolerant regardless of VCC |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection to system ground plane |
| 11–18 (B8–B1) | Port B bidirectional I/O | Reversed pin order (B8 to B1) vs A-port; same electrical specs and voltage tolerance as A-port |
| 19 (OE) | Output enable input | Low = outputs active; High = all outputs in high-impedance state; pull-up required for power-up safety |
| 20 (VCC) | Power supply | Single supply for core and I/O; bypass capacitor (0.1 µF) required within 3 mm of pin per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V inputs safely interface with 3.3-V VCC supply - eliminates external translators in FPGA-to-peripheral bridges |
| Integrated 26-Ω output series resistance | Reduces ringing and EMI on unterminated traces; avoids layout complexity and cost of discrete 22–33 Ω resistors |
| Ioff partial-power-down support | Prevents destructive back-current when VCC is off but buses remain live - essential for modular hot-swap systems |
| Low ground bounce (VOLP < 0.8 V) | Minimizes noise coupling into shared ground nets during simultaneous switching - improves signal integrity in dense logic arrays |
| Latch-up immunity > 250 mA | Complies with JESD17 - ensures reliability under transient overvoltage or ESD events in industrial environments |
Applications
| Wearable Health Devices | Network Switch Control Plane |
|---|---|
|
Use Scenario: Interfacing a 3.3-V ARM Cortex-M microcontroller with legacy 5-V sensor hubs and display drivers in compact wearable form factors. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver managing data flow between MCU and peripheral ICs across mixed-supply domains. Use Value: Eliminates discrete level shifters and reduces PCB area by 30% while maintaining 6.3 ns timing compliance for real-time biometric sampling. |
Use Scenario: Isolating management MCU I/O from hot-swappable line cards in enterprise Ethernet switches operating at –40°C to 85°C ambient. IC Role / Device Role / Timing Role: 3-state-enabled bus buffer providing controlled data handoff and power-domain separation between control plane and data plane ASICs. Use Value: Ioff protection prevents back-drive damage during card insertion/removal; 125°C rating supports fanless chassis designs. |
| Servers (Baseboard Management) | Test & Measurement Equipment |
|
Use Scenario: Connecting BMC (Baseboard Management Controller) GPIOs to SMBus/I²C peripherals and front-panel LEDs across different voltage rails in 1U rack servers. IC Role / Device Role / Timing Role: Octal transceiver enabling flexible pin-mapping and voltage translation for out-of-band management interfaces. Use Value: 5.5-V input tolerance allows direct connection to 5-V SMBus devices; 26-Ω outputs suppress reflections on long backplane traces. |
Use Scenario: Buffering high-speed digital control signals between FPGA-based pattern generators and DUT (device-under-test) interfaces in automated test systems. IC Role / Device Role / Timing Role: Low-skew, low-tpd bus transceiver synchronizing trigger, clock, and data lines across multiple voltage domains. Use Value: 6.3 ns max tpd ensures <100 ps inter-channel skew; thermal resistance of 41.4°C/W enables stable operation at full load in enclosed test enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 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 resistors | Requires external series termination and level-shifting circuitry for 5-V interface use | Choose when operating exclusively in 3.3-V-only systems with tight cost constraints and no mixed-voltage requirements |
| TXB0108 | Auto-direction sensing; no DIR pin; supports 1.2–3.6 V on A-side and 1.65–5.5 V on B-side | Eliminates direction-control logic but adds latency (~20 ns) and limits deterministic timing control | Prefer for simple bidirectional data links where direction is data-driven; avoid when precise DIR-synchronized timing is required |
Compared with SN74LVC245A and TXB0108, the SN74LVCR2245ARGYR uniquely combines explicit DIR control, 5.5-V input tolerance, integrated termination, and sub-7 ns timing - making it optimal for deterministic, mixed-voltage, high-reliability bus bridging where layout simplicity and power sequencing robustness are critical.
Availability
SN74LVCR2245ARGYR is available at Aetrix Electronics and suitable for server baseboard management, network switch control planes, and wearable health device interfaces requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant VQFN packaging.
Supply support for SN74LVCR2245ARGYR 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 logic interface solutions and industrial-grade reliability validation.
The SN74LVCR2245ARGYR belongs to TI's LVCR (Low-Voltage CMOS with Regulated outputs) logic family, engineered specifically for robust mixed-voltage bus interfacing in thermally constrained, high-availability systems.
FAQ
What is the maximum input voltage the SN74LVCR2245ARGYR can tolerate?
The SN74LVCR2245ARGYR accepts input voltages up to 5.5 V on all A- and B-port pins, regardless of VCC setting (1.65–3.6 V). This overvoltage tolerance is explicitly specified in the Absolute Maximum Ratings table and enables direct interfacing with 5-V logic without external protection components. The 5.5-V rating applies under both powered and unpowered (VCC = 0 V) conditions due to internal clamp structures.
Does the SN74LVCR2245ARGYR require external series resistors on its outputs?
No, the SN74LVCR2245ARGYR does not require external series resistors. Each output incorporates an equivalent 26-Ω series resistor internally, as confirmed in the Features section and Electrical Characteristics table. This design eliminates reflection-induced ringing on unterminated PCB traces and reduces bill-of-materials count - verified across VCC = 1.8 V, 2.5 V, and 3.3 V operating points.
How does the Ioff feature function in the SN74LVCR2245ARGYR during power-down?
The Ioff feature in the SN74LVCR2245ARGYR disables all I/Os when VCC = 0 V, limiting leakage current to ±10 μA even if 5.5-V signals remain present on A or B ports. This prevents damaging back-current flow through the device during hot-swap or partial-power-down sequences - a requirement validated per JEDEC JESD78 and explicitly tested in the Electrical Characteristics table under Ioff conditions.
What is the thermal resistance (RθJA) of the SN74LVCR2245ARGYR in its VQFN-20 package?
The SN74LVCR2245ARGYR in the RGY (VQFN-20) package has a junction-to-ambient thermal resistance (RθJA) of 41.4°C/W, as published in the Thermal Information table. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for high-density layouts where thermal dissipation is constrained - notably lower than alternate packages like SOIC (74.7°C/W) or TSSOP (102.5°C/W).
Can the SN74LVCR2245ARGYR be used in a system where DIR and OE are tied together?
No, tying DIR and OE together is not recommended for the SN74LVCR2245ARGYR. The function table shows OE = High forces isolation regardless of DIR state, while DIR controls data direction only when OE = Low. Combining them eliminates independent control of direction and output enable, violating the intended functional modes and risking bus contention or unintended high-impedance states during transitions.
SN74LVCR2245ARGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCR
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-VQFN (3.5x4.5)
SN74LVCR2245ARGYR FAQ
1.How can I place an order for SN74LVCR2245ARGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCR2245ARGYR 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 SN74LVCR2245ARGYR reliable?
The price and inventory of SN74LVCR2245ARGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCR2245ARGYR is usually 5 days.
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4.How is shipping managed for SN74LVCR2245ARGYR?
SN74LVCR2245ARGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCR2245ARGYR 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 SN74LVCR2245ARGYR?
For technical support, including SN74LVCR2245ARGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCR2245ARGYR requirements.
6.How does Aetrix verify that SN74LVCR2245ARGYR is sourced from the original manufacturer or authorized distributors?
All SN74LVCR2245ARGYR 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 SN74LVCR2245ARGYR meets industry standards.
7.What is the process for return or replacement of SN74LVCR2245ARGYR?
All SN74LVCR2245ARGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCR2245ARGYR, 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 SN74LVCR2245ARGYR part is unused and in its original packaging.
Return procedure for SN74LVCR2245ARGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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