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Texas Instruments SN74AVC4T245PWTE4
- Part No.:
- SN74AVC4T245PWTE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC4T245PWTE4.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVC4T245 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O tolerance, Ioff partial-power-down support, and up to 380Mbps data rate (1.8V→3.3V). It is used in mixed-voltage system interconnects such as SoC-to-peripheral interfaces.
For engineers reviewing the SN74AVC4T245 datasheet, SN74AVC4T245 pinout, SN74AVC4T245 application, or SN74AVC4T245 equivalent, key selection considerations include dual-rail voltage configurability, direction-control per channel, 3-state output enable timing, and Ioff-enabled safe power sequencing in partial-down systems.
Technical Context
The SN74AVC4T245 implements two independent 2-bit bidirectional channels, each with dedicated DIR and OE controls referenced to VCCA. Its fully configurable dual-rail architecture allows asymmetric operation-e.g., VCCA = 1.8V driving A-port I/Os while VCCB = 3.3V powers B-port I/Os-with VIH/VIL thresholds dynamically tracking VCCA.
It supports asynchronous bidirectional data flow: low DIR enables B→A transmission; high DIR enables A→B transmission; high OE forces both ports into high-impedance isolation. The Ioff circuit disables outputs when either VCCA or VCCB = 0V, preventing backflow current during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables translation across 1.2V/1.5V/1.8V/2.5V/3.3V nodes without level-shifter ICs |
| Max Data Rate | 380Mbps (1.8V→3.3V) - supports high-speed interface bridging in USB, PCIe, or memory subsystems |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy peripherals without external clamping |
| Ioff Current | ±0.1μA max at 0V supply - ensures no damaging backfeed during staggered power-up/down sequences |
| ESD Rating (HBM) | 8kV - meets industrial-grade robustness requirements for board-level handling and field operation |
| Propagation Delay | 2.6–3.6ns (typ, VCCA=3.3V/VCCB=3.3V) - enables sub-4ns timing margins in 200+MHz clock domains |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature range deployment |
Pinout & Package
PW package: 16-pin TSSOP, 5mm × 6.4mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per channel) | Referenced to VCCA; low = B→A data flow, high = A→B data flow |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; high = 3-state (Hi-Z) on corresponding port outputs |
| 1A1–2A2 | A-port I/O (4 pins) | Bi-directional signals referenced to VCCA; tolerate up to 4.6V regardless of VCCA |
| 1B1–2B2 | B-port I/O (4 pins) | Bi-directional signals referenced to VCCB; tolerate up to 4.6V regardless of VCCB |
| VCCA | A-port supply | Powers A-port I/Os and all control inputs (DIR/OE); sets VIH/VIL thresholds |
| VCCB | B-port supply | Powers B-port I/Os only; independent of VCCA for true dual-rail operation |
| GND | Ground reference | Two dedicated GND pins (pins 8 & 9) minimize ground bounce in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2-bit channels | Enables concurrent, isolated translation paths-e.g., one channel for address/data, another for control signals |
| VCCA-referenced control logic | Eliminates need for separate level shifters on DIR/OE lines when interfacing with 1.2V–3.3V controllers |
| VCC isolation behavior | Both ports enter Hi-Z if either VCCA or VCCB = 0V-critical for hot-swap and graceful power-fail response |
| Configurable 3-state timing | tPZH/tPHZ < 6.2ns (max) ensures fast bus release and acquisition in time-critical arbitration protocols |
| Low ICCA + ICCB | 16μA max quiescent current reduces standby power in battery-backed or always-on edge devices |
Applications
| Mobile SoC Interconnect | Industrial PLC Backplane |
|---|---|
Use Scenario: Connecting a 1.8V application processor to a 3.3V display interface and 1.2V sensor hub within a smartphone PCB. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing simultaneous A→B (processor→display) and B→A (sensor→processor) traffic with per-channel DIR/OE control. Use Value: Eliminates four discrete level shifters; supports 380Mbps pixel clock forwarding and low-latency touch response via sub-4ns propagation delay. | Use Scenario: Bridging a 2.5V FPGA I/O bank to legacy 5V-tolerant I/O modules in a programmable logic controller rack. IC Role / Device Role / Timing Role: Isolating voltage domains while preserving signal integrity and enabling hot-swap-safe power sequencing via Ioff. Use Value: 4.6V I/O tolerance prevents damage from 5V module leakage; VCC isolation prevents backfeed during module insertion/removal. |
| Enterprise SSD Controller | Automotive ADAS Camera Link |
Use Scenario: Translating between a 1.2V NVMe controller and 1.8V NAND flash packages in an M.2 SSD. IC Role / Device Role / Timing Role: High-speed bidirectional data path with precise 3-state control to avoid bus contention during command/address vs. data phases. Use Value: 150Mbps minimum rate at 1.2V supports ONFI/Toggle DDR timing; low CpdA/CpdB (<2pF) minimizes signal loading on dense NAND buses. | Use Scenario: Interfacing a 3.3V image signal processor (ISP) with a 1.5V MIPI CSI-2 camera sensor in a rear-view camera module. IC Role / Device Role / Timing Role: Low-jitter, low-skew bidirectional translation for clock-forwarded pixel streams and embedded control (I²C/CSI-2 D-PHY AUX). Use Value: Matched tPLH/tPHL (≤3.6ns) ensures <0.5ns skew across 4-bit data lanes; –40°C to +85°C rating meets automotive AEC-Q100 ambient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245 | Lower max data rate (240Mbps), no Ioff, VCC min = 1.65V | Not suitable for 1.2V/1.5V systems or partial-power-down designs | Select SN74AVC4T245 when operating below 1.65V or requiring Ioff protection. |
| TXS0104E | Auto-direction sensing (no DIR pin), lower drive strength (±8mA), no 4.6V tolerance | Unidirectional use cases only; unsuitable for push-pull bus arbitration or 4.6V-tolerant peripherals | Choose SN74AVC4T245 for manual DIR control, higher drive, and robust 4.6V I/O compatibility. |
Compared with SN74LVC4T245 and TXS0104E, the SN74AVC4T245 uniquely supports 1.2V operation, Ioff-enabled power sequencing, and 4.6V I/O tolerance-making it the only option for mixed-voltage industrial and mobile designs requiring full bus control and safety-critical power management.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for mobile SoC interconnect, industrial PLC backplane, enterprise SSD controller, and automotive ADAS camera link applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVC4T245 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and enterprise markets.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, designed specifically for ultra-low-voltage bidirectional translation in space-constrained, multi-rail digital systems.
FAQ
What voltage ranges does the SN74AVC4T245 support on its A and B ports?
The SN74AVC4T245 supports 1.2V to 3.6V independently 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 dual-rail capability is confirmed in Section 7.3.1 of the datasheet and validated across all recommended operating conditions in Table 5.3.
Does the SN74AVC4T245 support partial power-down, and how is it implemented?
Yes, the SN74AVC4T245 supports partial power-down via its Ioff feature. When either VCCA or VCCB is at 0V, the Ioff circuitry disables all I/O outputs, limiting off-state current to ±0.1μA max and preventing damaging backflow current. This behavior is specified in Section 7.3.3 and verified in Table 5.5 under Ioff test conditions.
What is the maximum data rate achievable with the SN74AVC4T245, and under what conditions?
The SN74AVC4T245 achieves up to 380Mbps when translating from 1.8V to 3.3V, as explicitly stated in the Features section and confirmed in Table 5.7–5.11 switching characteristics. Rates decrease with lower voltage combinations: 200Mbps (<1.8V→3.3V), 150Mbps (→1.5V), and 100Mbps (→1.2V).
How are the direction-control (DIR) and output-enable (OE) pins powered and referenced?
Both DIR and OE inputs are powered by and referenced to VCCA-not VCCB-ensuring consistent threshold behavior regardless of B-port voltage. This is documented in Section 3 (Description) and Table 4-1 (Pin Functions), where 1DIR, 2DIR, 1OE, and 2OE are explicitly defined as "referenced to VCCA".
Is the SN74AVC4T245 compatible with 4.6V-tolerant I/Os, and what design benefit does this provide?
Yes, the SN74AVC4T245 I/Os are rated for 4.6V regardless of VCCA or VCCB supply voltage, as specified in Section 5.1 Absolute Maximum Ratings. This tolerance allows direct connection to legacy 5V peripherals without external clamping diodes or resistors, simplifying BOM and improving signal integrity in mixed-voltage systems.
SN74AVC4T245PWTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- 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:
- 16-TSSOP
SN74AVC4T245PWTE4 FAQ
1.How can I place an order for SN74AVC4T245PWTE4 through Aetrix?
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6.How does Aetrix verify that SN74AVC4T245PWTE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245PWTE4 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 SN74AVC4T245PWTE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245PWTE4?
All SN74AVC4T245PWTE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245PWTE4, 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 SN74AVC4T245PWTE4 part is unused and in its original packaging.
Return procedure for SN74AVC4T245PWTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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