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Texas Instruments SN74LVCR2245ANSR
- Part No.:
- SN74LVCR2245ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVCR2245ANSR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
SN74LVCR2245ANSR 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-mode signaling (5.5-V-tolerant inputs with 3.3-V VCC), features integrated 26-Ω output series resistors, and delivers 6.3 ns max propagation delay at 3.3 V - enabling robust level translation in server backplanes and industrial control I/O expansion.
For engineers reviewing the SN74LVCR2245ANSR datasheet, SN74LVCR2245ANSR pinout, SN74LVCR2245ANSR application, or SN74LVCR2245ANSR equivalent, key selection criteria include Ioff-enabled live insertion support, guaranteed 125°C operation, 5.5-V input tolerance, and SOP-20 package compatibility with legacy board layouts requiring minimal redesign.
Technical Context
The SN74LVCR2245ANSR implements dual-bus directional control via DIR pin and 3-state output enable via OE, allowing configurable A→B or B→A data flow with high-impedance isolation. Its CMOS design integrates on-die 26-Ω series termination per output to suppress overshoot/undershoot without external components.
It supports partial-power-down operation through Ioff circuitry that disables outputs and blocks current backflow when VCC = 0 V, while maintaining 5.5-V input tolerance across all operating VCC conditions (1.65–3.6 V). Functional modes are strictly defined by OE/DIR logic combinations per TI's validated truth table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe interfacing with 5-V legacy peripherals in mixed-voltage systems. |
| Max tpd | 6.3 ns at 3.3 V - ensures sub-7-ns latency for high-speed bus arbitration in network switches and test equipment. |
| Output Drive | ±12 mA per channel - sufficient to drive standard CMOS loads and light stubs without external buffers. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules and industrial PLC backplanes. |
| Ioff Support | Yes - prevents damaging back-current during hot-swap or partial power-down sequences in modular systems. |
| ESD Rating | 2000-V HBM, 1000-V CDM - exceeds JEDEC standards for handling robustness in manufacturing environments. |
Pinout & Package
SOP-20 (NS) package, 12.80 mm × 7.50 mm body size, with 0.65-mm lead pitch and gull-wing leads. RoHS-compliant, NIPDAU finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Low = B-to-A data flow; High = A-to-B data flow - determines real-time bus directionality. |
| 2–9 A1–A8 | Port A I/O terminals | Bidirectional data lines tied to one bus segment; tolerate 0–5.5 V regardless of VCC. |
| 10 GND | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance. |
| 11–18 B1–B8 | Port B I/O terminals | Bidirectional data lines tied to second bus segment; electrically identical to A-port pins. |
| 19 OE | Output enable input | Low = outputs active; High = all outputs enter high-impedance state - enables bus isolation. |
| 20 VCC | Power supply | Supplies core logic and output drivers; requires local 0.1-μF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 26-Ω series output resistors | Eliminates need for eight discrete 26-Ω resistors - reduces BOM count, PCB area, and signal integrity tuning effort. |
| 5.5-V tolerant inputs | Enables direct connection to 5-V microcontrollers or sensors without external clamping diodes or translators. |
| Ioff partial-power-down protection | Blocks >10 μA back-current when VCC = 0 V - certified for hot-plug applications like modular server I/O cards. |
| Guaranteed 125°C operation | Validated switching performance up to +125°C ambient - supports deployment in enclosed industrial enclosures without derating. |
| Low ground bounce (VOLP < 0.8 V) | Minimizes noise coupling into shared ground planes - critical for mixed-signal systems with ADCs or precision analog circuits. |
Applications
| Wearable Health Devices | Network Switch Backplanes |
|---|---|
Use Scenario: Interfacing a 3.3-V MCU to 5-V biometric sensor arrays in compact wearable form factors. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus isolator managing sensor data reads and configuration writes. Use Value: Eliminates discrete level-shifting components while meeting strict space and thermal constraints (<125°C junction). |
Use Scenario: Isolating control-plane and data-plane buses in enterprise-grade Ethernet switches during firmware updates. IC Role / Device Role / Timing Role: Hot-swap-capable bus transceiver enabling live replacement of line cards without system reset. Use Value: Ioff protection prevents backfeed damage; 6.3-ns tpd ensures no timing violation in 10-Gbps control interfaces. |
| Servers (Memory Expansion) | Test & Measurement Equipment |
Use Scenario: Extending DDR4 memory address/control bus from CPU socket to remote DIMM slots in 2U rack servers. IC Role / Device Role / Timing Role: Low-skew, terminated bus repeater preserving signal integrity across 10-cm+ traces. Use Value: On-die 26-Ω resistors reduce reflection-induced jitter; 125°C rating supports dense thermal environments. |
Use Scenario: Routing digital trigger and calibration signals between FPGA-based acquisition modules and analog front-end ASICs. IC Role / Device Role / Timing Role: Precision-controlled bidirectional interface synchronizing multi-channel sampling clocks and status flags. Use Value: Guaranteed VOLP < 0.8 V prevents false triggering; 5.5-V tolerance accommodates legacy instrument I/O standards. |
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 resistors and clamping for 5-V interfaces; unsuitable for mixed-voltage hot-swap. | Select only if operating exclusively within 3.3-V domain and external termination is acceptable. |
| SN74AVC245 | Lower VCC range (1.2–3.6 V); higher speed (4.2 ns tpd at 3.3 V); no Ioff support. | Not rated for 125°C; cannot safely power down while connected to live 5-V buses. | Prefer for ultra-low-latency 1.2-V/1.8-V systems where thermal margin and hot-swap are not required. |
Compared with SN74LVC245A and SN74AVC245, the SN74LVCR2245ANSR uniquely combines 5.5-V input tolerance, integrated termination, Ioff, and 125°C qualification - making it the sole choice for ruggedized mixed-voltage backplane and hot-plug applications.
Availability
SN74LVCR2245ANSR is available at Aetrix Electronics and suitable for server backplanes, industrial PLC I/O modules, and wearable health device interconnects requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for SN74LVCR2245ANSR 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 over 90 years of innovation in high-reliability silicon solutions.
The SN74LVCR2245ANSR belongs to TI's LVCR logic family, engineered specifically for robust voltage translation and bus isolation in thermally demanding, mixed-supply industrial and communications infrastructure applications.
FAQ
What is the maximum input voltage the SN74LVCR2245ANSR can tolerate?
The SN74LVCR2245ANSR 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 is explicitly verified in the Absolute Maximum Ratings table and confirmed in the Feature Description section of the datasheet. The 5.5-V tolerance enables direct interfacing with 5-V logic without external protection components, and applies across the full –40°C to +125°C operating range.
Does the SN74LVCR2245ANSR support hot-swap or live insertion?
Yes, the SN74LVCR2245ANSR supports live insertion via its Ioff feature, which actively disables outputs and blocks current backflow when VCC = 0 V. This capability is documented in the Features list, Detailed Description section, and Functional Modes table. Ioff is characterized to limit leakage to ±10 μA at 5.5 V, ensuring safe operation during partial-power-down sequences in modular server and telecom equipment.
What is the purpose of the integrated 26-Ω resistors in the SN74LVCR2245ANSR?
The SN74LVCR2245ANSR integrates 26-Ω series resistors on all eight A- and B-port outputs to damp signal reflections and reduce overshoot/undershoot without requiring external components. This is specified in the Features list and validated by typical VOLP < 0.8 V and VOHV > 2 V measurements at 3.3 V. The resistors are process-trimmed and temperature-compensated, eliminating layout-dependent impedance matching effort.
Can the SN74LVCR2245ANSR operate at 125°C ambient temperature?
Yes, the SN74LVCR2245ANSR is fully specified and tested for operation from –40°C to +125°C ambient, as confirmed in the Recommended Operating Conditions table and Switching Characteristics tables (–40°C to 125°C). Thermal metrics including RθJA = 74.7°C/W (SOP-20) ensure reliable junction temperature control under sustained load at maximum ambient.
What package type does the SN74LVCR2245ANSR use, and what are its key mechanical dimensions?
The SN74LVCR2245ANSR uses the SOP-20 (NS) package, with nominal body dimensions of 12.80 mm × 7.50 mm and 0.65-mm lead pitch. This is confirmed in the Device Information table and Package Option Addendum. The NS package is pin-compatible with legacy SOIC-20 footprints, enabling drop-in replacement in existing designs without PCB rework.
SN74LVCR2245ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCR
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- 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-SO
SN74LVCR2245ANSR FAQ
1.How can I place an order for SN74LVCR2245ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCR2245ANSR 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 SN74LVCR2245ANSR reliable?
The price and inventory of SN74LVCR2245ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCR2245ANSR is usually 5 days.
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SN74LVCR2245ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCR2245ANSR 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 SN74LVCR2245ANSR?
For technical support, including SN74LVCR2245ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCR2245ANSR requirements.
6.How does Aetrix verify that SN74LVCR2245ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVCR2245ANSR 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 SN74LVCR2245ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVCR2245ANSR?
All SN74LVCR2245ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCR2245ANSR, 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 SN74LVCR2245ANSR part is unused and in its original packaging.
Return procedure for SN74LVCR2245ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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