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Texas Instruments SN74AVC16T245ZQLR
- Part No.:
- SN74AVC16T245ZQLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-VFBGA
- Datasheet:
-
SN74AVC16T245ZQLR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,248
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Product details
Overview
SN74AVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V domains. It features independent A-port (VCCA-referenced) and B-port (VCCB-referenced) rails, tri-state outputs controlled by 1OE/2OE, direction control via 1DIR/2DIR, and supports up to 380Mbps data rate (1.8V→3.3V). It is used in mixed-voltage interconnects between low-voltage processors and legacy peripherals.
For engineers reviewing the SN74AVC16T245 datasheet, SN74AVC16T245 pinout, SN74AVC16T245 application, or SN74AVC16T245 equivalent, key selection criteria include VCCA/VCCB supply flexibility (1.2V–3.6V), Ioff-enabled partial-power-down operation, VCC isolation behavior, 4.6V I/O tolerance, and propagation delay performance across voltage combinations.
Technical Context
The SN74AVC16T245 implements a fully configurable dual-rail architecture where each port operates independently across 1.2V–3.6V, with control inputs (DIR, OE) referenced solely to VCCA. Its level-shifting function relies on internal voltage-aware output drivers-not passive resistor networks or charge pumps-enabling true asynchronous bidirectional translation without clocking or protocol awareness.
Functional mode selection is determined exclusively by the logic states of two DIR and two OE pins: DIR high enables A→B transmission; DIR low enables B→A; OE high forces both ports into high-impedance. The VCC isolation feature guarantees simultaneous high-Z on both ports if either VCCA or VCCB drops to GND, preventing bus contention during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.2V to 3.6V each - enables translation between any pair of 1.2V/1.5V/1.8V/2.5V/3.3V nodes |
| Max Data Rate | 380Mbps (1.8V→3.3V) - defines maximum usable frequency for high-speed serial bus bridging |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with 3.3V systems while powered from 1.2V supplies |
| Ioff Current | ±5µA max at 0V supply - ensures no backflow current during partial power-down, protecting upstream sources |
| Propagation Delay (tPLH/tPHL) | 2.7ns–6.2ns (VCCA=3.3V, VCCB=3.3V) - determines minimum achievable signal round-trip latency in bidirectional links |
| ESD Rating (HBM) | ±8000V - meets industrial-grade robustness requirements for board-level handling and system integration |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and enterprise equipment deployment |
Pinout & Package
The SN74AVC16T245ZQLR uses the 56-pin BGA MICROSTAR JUNIOR package (7.00 mm × 4.50 mm), optimized for high-density PCB layouts and thermal performance (RθJA = 64.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input | Referenced to VCCA; high = A→B data flow, low = B→A; controls internal transceiver path selection |
| 1OE, 2OE | Output-enable input | Referenced to VCCA; high = tri-state both A and B ports, isolating buses regardless of DIR state |
| 1A1–1A8, 2A1–2A8 | A-port I/O | Bi-directional signals referenced to VCCA; track VCCA supply for VIH/VIL thresholds and output swing |
| 1B1–1B8, 2B1–2B8 | B-port I/O | Bi-directional signals referenced to VCCB; track VCCB supply for VIH/VIL thresholds and output swing |
| VCCA | A-port supply | Power rail for A-side logic and control inputs (DIR, OE); sets VIH/VIL levels for all control pins |
| VCCB | B-port supply | Power rail for B-side logic; defines output voltage range and input threshold reference for B-port signals |
| GND | Ground | Common reference for both ports; eight dedicated pins ensure low-impedance return paths and noise immunity |
| N.C. | No internal connection | Eight unconnected pads (A2–A5, K2–K5) - must remain unconnected per design; no routing or stitching |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2V–3.6V operation on A and B ports enables interoperability across five standard logic families without external biasing |
| VCC isolation | Automatic high-impedance on both ports if either VCCA or VCCB = GND - eliminates bus contention during asymmetric power-up/down sequences |
| Ioff partial-power-down support | Active Ioff circuitry blocks reverse current when VCCA or VCCB is unpowered - prevents damage to live buses connected to powered side |
| 4.6V-tolerant I/Os | Allows safe connection to 3.3V systems even when operating from 1.2V supplies - removes need for external clamping diodes |
| Configurable direction control | Two independent DIR/OE pairs (1x and 2x) enable segmented 8-bit channel management - supports split-bus architectures and selective isolation |
Applications
| Processor-to-Peripheral Bridge | Multi-Voltage Memory Interface |
|---|---|
Use Scenario: Interfacing a 1.8V ARM-based SoC with a 3.3V UART or SPI peripheral in an industrial controller. IC Role / Device Role / Timing Role: Bidirectional level translator managing data flow direction under software control; provides sub-3ns propagation delay for real-time response. Use Value: Eliminates discrete resistor-divider or MOSFET-based solutions, reducing BOM count and layout area while guaranteeing timing compliance at 380Mbps. |
Use Scenario: Connecting a 1.2V DDR3L memory controller to 1.5V DDR3 SDRAM in a telecom baseband module. IC Role / Device Role / Timing Role: Voltage-translating transceiver synchronizing read/write strobes and data lanes; supports 200Mbps operation at 1.2V→1.5V. Use Value: Maintains signal integrity across voltage domains without skew penalties, enabling reliable high-speed memory access in power-constrained designs. |
| FPGA I/O Expansion | Legacy System Upgrade Interface |
Use Scenario: Expanding I/O voltage compatibility of a 1.5V FPGA to drive 2.5V sensor interface lines in an automotive ADAS domain controller. IC Role / Device Role / Timing Role: Configurable bus transceiver translating control/status signals bidirectionally; leverages Ioff to prevent backfeed during FPGA configuration phase. Use Value: Enables reuse of existing 2.5V sensor subsystems without redesigning FPGA I/O banks or adding external level shifters. |
Use Scenario: Integrating a modern 1.8V microcontroller into a legacy 3.3V industrial PLC backplane with parallel address/data bus. IC Role / Device Role / Timing Role: Asynchronous bidirectional translator handling address latching and data transfer; uses VCC isolation to prevent bus lockup during MCU reset. Use Value: Provides seamless drop-in replacement for obsolete 3.3V-only transceivers, preserving PCB layout while enabling lower-power MCU migration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH16T245 | Includes bus-hold circuitry on all I/Os; otherwise identical voltage range, pinout, and timing | Eliminates need for external pull-ups on unused or floating data lines; increases static power slightly | Select when bus stability with unterminated or intermittently driven lines is required |
| SN74LVC16T245 | Fixed 3.3V/1.8V dual-supply operation only; no support for 1.2V or 2.5V on either rail; lower max speed (200Mbps) | Not suitable for 1.2V or 2.5V translation; limited to fixed-voltage node bridging | Select only for cost-sensitive 3.3V↔1.8V applications where full 1.2V–3.6V flexibility is unnecessary |
Compared with SN74AVCH16T245 and SN74LVC16T245, the SN74AVC16T245 offers widest supply voltage coverage (1.2V–3.6V) and highest speed (380Mbps), making it optimal for next-generation low-voltage system integration where bus-hold is not required and flexible rail assignment is critical.
Availability
SN74AVC16T245 is available at Aetrix Electronics and suitable for industrial controllers, telecom infrastructure, enterprise storage, and automotive ADAS requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for SN74AVC16T245 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 experience in high-reliability interface ICs.
The SN74AVC16T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) family, designed specifically for ultra-low-voltage bidirectional level translation in space- and power-constrained digital systems.
FAQ
What voltage ranges can the SN74AVC16T245 support on its A and B ports?
The SN74AVC16T245 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port), enabling translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. This full-range flexibility is confirmed in Section 6.3 (Recommended Operating Conditions) and Section 8.3.1 of the datasheet.
Does the SN74AVC16T245 require external pull-up resistors on its control inputs?
No - the SN74AVC16T245 control inputs (1DIR, 2DIR, 1OE, 2OE) are CMOS-compatible and referenced to VCCA, so they do not require external pull-ups for basic operation. However, TI recommends tying OE to VCCA through a pull-up resistor during power-up to ensure high-impedance state until firmware initializes control logic, as noted in Section 4 (Description, continued).
How does the VCC isolation feature behave in the SN74AVC16T245?
The VCC isolation feature in the SN74AVC16T245 forces both A and B ports into high-impedance whenever either VCCA or VCCB is at GND. This behavior is hardware-enforced and requires no external circuitry - it prevents false logic states and bus contention during asymmetric power sequencing, as specified in Section 1 (Features) and Section 8.3.3.
Can the SN74AVC16T245 operate with VCCA = 1.2V and VCCB = 3.3V?
Yes - the SN74AVC16T245 is explicitly rated for 1.2V-to-3.3V level shifting, delivering up to 100Mbps data rate in this configuration (Section 1, Features). Propagation delays and output drive strength remain within specification, and I/Os maintain 4.6V tolerance, ensuring robust interface to 3.3V systems.
What is the thermal performance of the SN74AVC16T245ZQLR package?
The SN74AVC16T245ZQLR uses the 56-pin BGA MICROSTAR JUNIOR package with RθJA = 64.6°C/W (Section 6.4 Thermal Information). Its junction-to-board thermal resistance (RθJB) is 30.8°C/W, supporting reliable operation up to +85°C ambient in typical 2-layer PCB layouts with standard copper pour.
SN74AVC16T245ZQLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 56-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-BGA Microstar Junior (7x4.5)
SN74AVC16T245ZQLR FAQ
1.How can I place an order for SN74AVC16T245ZQLR through Aetrix?
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6.How does Aetrix verify that SN74AVC16T245ZQLR is sourced from the original manufacturer or authorized distributors?
All SN74AVC16T245ZQLR 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 SN74AVC16T245ZQLR meets industry standards.
7.What is the process for return or replacement of SN74AVC16T245ZQLR?
All SN74AVC16T245ZQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC16T245ZQLR, 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 SN74AVC16T245ZQLR part is unused and in its original packaging.
Return procedure for SN74AVC16T245ZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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