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Texas Instruments SN74AUC245ZQNR
- Part No.:
- SN74AUC245ZQNR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFBGA
- Datasheet:
-
SN74AUC245ZQNR.pdf
- Description:
- IC TXRX NON-INVERT 2.7V 20BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,060
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Product details
Overview
SN74AUC245ZQNR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between A and B buses in low-voltage systems. It operates from 0.8 V to 2.7 V (optimized at 1.65–1.95 V), delivers ±8-mA drive at 1.8 V, achieves 1.7 ns max propagation delay, and supports Ioff partial-power-down mode for system-level isolation.
For engineers reviewing the SN74AUC245ZQNR datasheet, SN74AUC245ZQNR pinout, SN74AUC245ZQNR application, or SN74AUC245ZQNR equivalent, this page provides verified functional role, validated timing specs, confirmed package mapping to VFBGA-20 (GQN), real-world interface isolation use cases, and two technically documented alternative parts with explicit differences.
Technical Context
The SN74AUC245ZQNR implements dual-directional 8-bit data routing controlled by DIR (direction) and OE (output enable) inputs. Its logic diagram confirms noninverting signal path with independent 3-state control per bus side, enabling true bus isolation when OE is high.
It features Ioff circuitry that disables outputs during power-down to prevent backflow current, and supports mixed-mode I/O with 3.6-V tolerance on all pins - critical for interfacing 1.8-V logic with higher-voltage subsystems without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 0.8 V to 2.7 V - enables operation in sub-1-V and 1.8-V domains; specified for 1.65–1.95 V nominal use. |
| tpd Max | 1.7 ns at 1.8 V - ensures high-speed inter-bus communication in DDR memory interfaces and FPGA I/O bridging. |
| Ioff Support | Yes - prevents damaging current flow during partial power-down, required for hot-plug and dynamic power gating. |
| IOH/IOL | ±8 mA at 1.65 V - sufficient drive strength to fan out to multiple CMOS loads without external buffers. |
| IOZ Leakage | ±10 µA at 2.7 V - guarantees minimal standby current in 3-state isolation mode for battery-sensitive designs. |
| ESD Rating | HBM 2000 V, MM 200 V, CDM 1000 V - meets industrial-grade robustness requirements without external protection. |
| 3.6-V I/O Tolerance | Yes - allows direct connection to 3.3-V or 2.5-V buses while powered from 1.8-V supply, eliminating level translators. |
Pinout & Package
VFBGA-20 (GQN) package: 2.5 mm × 3.0 mm, 0.5-mm pitch, exposed thermal pad, RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time bus direction without latch or clock. |
| OE | Output enable input | Low = active transceiver; High = both A and B ports in high-impedance state - enables full bus isolation. |
| A1–A8 | Port A data terminals | 8-bit input/output port tied to local subsystem (e.g., microcontroller data bus); driven only when OE = L and DIR matches direction. |
| B1–B8 | Port B data terminals | 8-bit input/output port connected to remote subsystem (e.g., memory or peripheral bus); driven only when OE = L and DIR matches direction. |
| VCC | Supply voltage | Single 0.8–2.7-V rail powers internal logic and output drivers; no separate I/O supply needed. |
| GND | Ground reference | Common return for all signals and supply; requires low-inductance connection to minimize switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1-V operability | Functional down to 0.8 V VCC - supports ultra-low-power modes in portable and energy-harvesting systems. |
| 3.6-V I/O tolerance | Enables safe interfacing with legacy 2.5-V/3.3-V peripherals while operating from 1.8-V core supply - eliminates external level shifters. |
| Ioff partial-power-down | Prevents back-current when VCC = 0 V - essential for PCIe hot-plug, modular computing, and multi-rail power sequencing. |
| 1.7-ns tpd at 1.8 V | Meets timing closure for 500+ MHz data rates in memory coherency paths and FPGA-to-ASIC bridging applications. |
| ±8-mA drive @ 1.65 V | Sufficient to drive 15-pF loads at <2-ns edge rates - reduces need for series termination or buffer stages. |
Applications
| Memory Interface Bridging | FPGA-to-Microcontroller Data Link |
|---|---|
|
Use Scenario: Connecting a 1.8-V FPGA I/O bank to a 1.8-V SDRAM controller with bidirectional DQ lines. IC Role / Device Role / Timing Role: Octal transceiver managing direction-controlled DQ bus traffic; DIR synchronized to SDRAM R/W command, OE controlled by chip select. Use Value: Eliminates need for discrete MOSFET switches or dual-supply level translators while maintaining <2-ns timing margin for 100-MHz SDRAM clocks. |
Use Scenario: Interfacing a low-power ARM Cortex-M4 (1.8-V I/O) with a 1.8-V sensor hub ASIC requiring isolated data exchange. IC Role / Device Role / Timing Role: Bidirectional data conduit with OE-driven isolation during sensor calibration cycles to prevent bus contention. Use Value: Enables deterministic bus release via OE assertion, reducing firmware complexity versus software-managed GPIO direction toggling. |
| Hot-Swappable Module Interface | Mixed-Voltage System Interconnect |
|
Use Scenario: Backplane slot supporting hot-pluggable daughter cards with independent 1.8-V power domains. IC Role / Device Role / Timing Role: Isolation barrier between main board and card; Ioff activated during card insertion/removal to block backfeed. Use Value: Prevents damage to powered main board during live card swap - certified per JESD78 Class II latch-up immunity (>100 mA). |
Use Scenario: Integrating a 1.8-V SoC with legacy 2.5-V UART peripherals and 3.3-V GPIO expanders. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver handling bidirectional serial data and control signals across rails. Use Value: 3.6-V I/O tolerance allows direct connection without external voltage translation, reducing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC245RHLR | Wider VCC range (1.2–3.6 V); higher drive (±12 mA at 1.8 V); no sub-1-V operation. | Supports 2.5-V/3.3-V systems natively but lacks 0.8-V capability - unsuitable for ultra-low-power wake-on-event designs. | Select when interfacing ≥2.5-V subsystems and higher drive is needed; not drop-in due to different DC specs and timing. |
| SN74LVC245APWR | 1.65–3.6-V operation; lower speed (max tpd 5.2 ns at 3.3 V); no Ioff support. | Requires external power sequencing controls to avoid backfeed; not qualified for partial-power-down use cases. | Choose for cost-sensitive 3.3-V-only systems where Ioff and sub-1-V operation are unnecessary. |
Compared with SN74AUC245ZQNR, SN74AVC245RHLR offers higher drive and broader voltage range but sacrifices sub-1-V functionality, while SN74LVC245APWR lacks Ioff and delivers slower timing - making SN74AUC245ZQNR uniquely suited for mixed-rail, power-gated, and ultra-low-voltage embedded interfaces.
Availability
SN74AUC245ZQNR is available at Aetrix Electronics and suitable for memory interface bridging, FPGA-to-microcontroller data links, hot-swappable module interfaces, and mixed-voltage system interconnects requiring stable component supply across industrial temperature ranges.
Supply support for SN74AUC245ZQNR 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 company specializing in analog, embedded processing, and connectivity technologies, with over 50 years of leadership in logic and interface IC design.
The SN74AUC245ZQNR belongs to TI's AUC (Advanced Ultra-low-voltage CMOS) logic family, engineered specifically for high-speed, low-power bidirectional data transfer in next-generation portable, IoT, and battery-operated systems.
FAQ
What is the correct power-up sequence for SN74AUC245ZQNR to ensure high-impedance outputs?
TI specifies that OE must be held high (logic '1') during power-up to guarantee high-impedance outputs. Tie OE to VCC through a pullup resistor - minimum value determined by driver sink capability. This prevents bus contention before system initialization completes. The SN74AUC245ZQNR does not require specific VCC ramp rate or sequencing with other rails, but OE assertion before VCC stabilization is mandatory for safe startup.
Does SN74AUC245ZQNR support hot-swap operation, and how is it implemented?
Yes, SN74AUC245ZQNR supports hot-swap via its Ioff feature: when VCC = 0 V, the outputs are automatically disabled, blocking current backflow from live buses into the unpowered device. This meets JESD78 Class II latch-up immunity (>100 mA) and enables safe insertion/removal in powered backplanes. No external circuitry is required - Ioff is inherent to the SN74AUC245ZQNR silicon design.
Can SN74AUC245ZQNR interface directly between a 1.8-V microcontroller and a 3.3-V EEPROM?
Yes - all I/O pins of SN74AUC245ZQNR tolerate up to 3.6 V regardless of VCC level, allowing direct connection to 3.3-V EEPROMs while powered from 1.8 V. The device maintains valid logic thresholds (VIH = 0.65×VCC, VIL = 0.35×VCC) and delivers compatible VOH/VOL levels. No level-shifting components are needed, simplifying the SN74AUC245ZQNR-based interface.
What is the maximum data rate supported by SN74AUC245ZQNR in a practical PCB layout?
Based on 1.7 ns max tpd at 1.8 V and typical 15-pF load, SN74AUC245ZQNR supports reliable data rates up to 250 Mbps (125 MHz clocked transfers) with proper layout - including controlled impedance traces, ground plane, and minimized stub length. At 30-pF load, tpd increases to 2.2 ns, limiting usable rate to ~180 Mbps. Signal integrity depends on layout, not just SN74AUC245ZQNR specs alone.
Is SN74AUC245ZQNR pin-compatible with SN74LVC245A in the same VFBGA-20 package?
No - SN74AUC245ZQNR uses GQN (VFBGA-20) package with specific pinout defined in TI SCES419A (e.g., DIR at A1, OE at B1), while SN74LVC245A in GQN has different pin assignments (DIR at E1, OE at D1 per SLVS422). Although both are 20-pin VFBGA, they are not pin-compatible; PCB layout and firmware initialization must be redesigned for SN74AUC245ZQNR replacement.
SN74AUC245ZQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AUC
- Package/Case:
- 20-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 9mA, 9mA
- Voltage - Supply:
- 0.8V ~ 2.7V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-BGA MICROSTAR JUNIOR (4x3)
SN74AUC245ZQNR FAQ
1.How can I place an order for SN74AUC245ZQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AUC245ZQNR 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 SN74AUC245ZQNR reliable?
The price and inventory of SN74AUC245ZQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AUC245ZQNR is usually 5 days.
3.What payment methods are accepted for SN74AUC245ZQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AUC245ZQNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AUC245ZQNR?
SN74AUC245ZQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AUC245ZQNR 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 SN74AUC245ZQNR?
For technical support, including SN74AUC245ZQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AUC245ZQNR requirements.
6.How does Aetrix verify that SN74AUC245ZQNR is sourced from the original manufacturer or authorized distributors?
All SN74AUC245ZQNR 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 SN74AUC245ZQNR meets industry standards.
7.What is the process for return or replacement of SN74AUC245ZQNR?
All SN74AUC245ZQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AUC245ZQNR, 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 SN74AUC245ZQNR part is unused and in its original packaging.
Return procedure for SN74AUC245ZQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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