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Texas Instruments SN74AVCB164245DGG
- Part No.:
- SN74AVCB164245DGG
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCB164245DGG.pdf
- Description:
- BUS TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:18,160
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Product details
Overview
SN74AVCB164245 from Texas Instruments is a 16-bit dual-supply bus transceiver with configurable voltage translation and 3-state outputs, designed for bidirectional level-shifting between 1.4-V to 3.6-V domains (e.g., 1.8-V ↔ 3.3-V). It features independent A/B ports tracking VCCA and VCCB, Ioff partial-power-down support, DOC™ dynamic output impedance control, and ±24-mA drive capability at 2.5-V VCC.
For engineers reviewing the SN74AVCB164245 datasheet, SN74AVCB164245 pinout, SN74AVCB164245 application, or SN74AVCB164245 equivalent, key selection criteria include mixed-voltage bus isolation, high-impedance state behavior during power sequencing, VIH/VIL referencing to VCCB, and TSSOP-48 package compatibility with 0.5-mm pitch PCB layouts.
Technical Context
This device implements asynchronous bidirectional data flow controlled by DIR and OE inputs per octal section. Each port operates independently across full 1.4-V to 3.6-V supply ranges, enabling translation without speed degradation-tpd as low as 1.3 ns (VCCA = 2.5 V, VCCB = 3.3 V, B→A direction).
The control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCB, and Ioff circuitry ensures both ports enter high-impedance state if either VCCA or VCCB is at GND. DOC™ dynamically modulates output impedance during transitions to reduce noise while maintaining ±24-mA peak drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.4 V to 3.6 V each - enables universal translation among 1.5-V, 1.8-V, 2.5-V, and 3.3-V logic domains. |
| Drive Strength | ±24 mA at 2.5-V VCC - supports driving standard CMOS loads with robust noise margin and signal integrity. |
| Propagation Delay (tpd) | 1.3–6.8 ns - varies with supply combinations; minimum 1.3 ns (B→A, VCCA=2.5 V, VCCB=3.3 V) ensures high-speed interconnect. |
| Ioff Current | ±10 µA max - prevents backflow current during partial power-down, critical for hot-swap and power-gating systems. |
| Input Voltage Reference | Control inputs referenced to VCCB - simplifies interface design when OE/DIR are driven from B-side logic domain. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JESD22 requirements for board-level reliability in industrial environments. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and extended industrial ambient conditions. |
Pinout & Package
TSSOP-48 package (DGG), 12.6 mm × 6.2 mm body, 0.5-mm lead pitch, JEDEC MO-153 compliant, with exposed thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per octal section) | Determines data flow direction: DIR = L → B-to-A; DIR = H → A-to-B; referenced to VCCB. |
| 1OE, 2OE | Output enable input (per octal section) | Active-low; drives outputs to high-impedance when high - enables bus isolation and power sequencing control. |
| 1A1–1A8, 2A1–2A8 | A-port data I/O (octal groups) | Track VCCA supply; tolerate up to VCCA + 0.5 V in active state and 4.6 V in 3-state. |
| 1B1–1B8, 2B1–2B8 | B-port data I/O (octal groups) | Track VCCB supply; tolerate up to VCCB + 0.5 V in active state and 4.6 V in 3-state. |
| VCCA, VCCB | Independent power supplies | VCCA powers A-port I/O and internal logic; VCCB powers B-port I/O and all control inputs (DIR/OE). |
| GND | Ground reference | Four dedicated GND pins (pins 4, 10, 25, 37) minimize ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Each port independently supports 1.4-V to 3.6-V supplies - eliminates need for external level shifters in mixed-voltage SoC/FPGA interfaces. |
| DOC™ dynamic output control | Reduces simultaneous switching noise by lowering output impedance during edge transition, then raising it - improves signal integrity without sacrificing drive strength. |
| Ioff partial-power-down protection | Prevents damaging current flow when VCCA or VCCB is unpowered - essential for PCIe add-in cards, hot-pluggable modules, and battery-backed subsystems. |
| Overvoltage-tolerant I/O | Withstands up to 4.6 V on any I/O pin regardless of supply state - enables safe interfacing with legacy 5-V peripherals via series resistors or direct connection in 3.3-V systems. |
| VCCB-referenced control inputs | DIR and OE thresholds scale with VCCB - guarantees reliable control signaling even when A and B domains operate at different voltages. |
Applications
| PCI Express Add-in Card Interface | FPGA-to-ASIC Voltage Translation |
|---|---|
Use Scenario: Interfacing a 3.3-V PCIe slot with a 1.8-V FPGA configuration bus and 2.5-V memory controller. IC Role / Device Role / Timing Role: Bidirectional level translator managing address/data/control signals between mismatched voltage domains with precise timing control via DIR/OE. Use Value: Eliminates discrete resistor networks or multiple single-bit translators; tpd ≤ 2.1 ns meets PCIe Gen1 setup/hold timing budgets. |
Use Scenario: Connecting a Xilinx Artix-7 FPGA (1.8-V I/O) to a TI C66x DSP (2.5-V EMIF) in a radar processing module. IC Role / Device Role / Timing Role: Dual-octal transceiver providing isolated, direction-controlled data paths with synchronized OE gating for burst-mode transfers. Use Value: Single-package solution reduces layout area by >60% vs. eight discrete translators; Ioff prevents backfeed during FPGA reconfiguration. |
| Industrial PLC Backplane Bus | Automotive Infotainment Gateway |
Use Scenario: Isolating 3.3-V microcontroller peripherals from 2.5-V sensor ADCs and 1.8-V display controllers on a shared backplane. IC Role / Device Role / Timing Role: Voltage-translating bus isolator with independent 3-state control per octet to prevent bus contention during firmware updates. Use Value: High-impedance state guaranteed even if one supply fails (Ioff); ESD rating supports EN 61000-4-2 Level 4 compliance. |
Use Scenario: Bridging a 3.3-V automotive MCU's CAN/LIN interface with a 1.8-V infotainment SoC's MIPI DSI and I²S audio links. IC Role / Device Role / Timing Role: Mixed-voltage signal conditioner enabling protocol-agnostic voltage translation for non-CAN digital buses. Use Value: Supports 100-MHz+ data rates required for HD video transport; RoHS-compliant CuNiPdAu finish meets automotive AEC-Q200 solderability standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC16T245DGGR | 16-bit, dual-supply, but only one DIR/OE pair for entire 16-bit bus - no per-octet control. | Lacks independent 3-state per octal group; unsuitable for segmented bus arbitration or partial isolation. | Select when full-bus direction control suffices and board space is constrained (same TSSOP-48 footprint). |
| TXB0108PWR | 8-bit auto-direction sensing; no DIR pin; lower drive (±2 mA); 1.2-V to 3.6-V range. | Not suitable for synchronous bidirectional protocols requiring explicit DIR control (e.g., parallel memory buses). | Prefer for I²C/SPI level shifting where direction detection is sufficient and ultra-low power (< 10 µA ICC) is critical. |
Compared with SN74AVCB164245, SN74AVC16T245DGGR offers simpler control but less flexible bus segmentation, while TXB0108PWR eliminates direction pins at the cost of deterministic timing control - making SN74AVCB164245 optimal for high-speed, explicitly managed bidirectional data paths.
Availability
SN74AVCB164245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment gateways, and FPGA-to-ASIC interconnects requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AVCB164245 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AVCB164245 belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for low-voltage, high-speed, mixed-domain system interconnects in space-constrained and thermally demanding applications.
FAQ
What is the maximum allowable voltage on SN74AVCB164245 I/O pins when VCCA or VCCB is unpowered?
When either VCCA or VCCB is at GND, the SN74AVCB164245 enters high-impedance state with overvoltage tolerance up to 4.6 V on any I/O pin - verified per Absolute Maximum Ratings. This allows safe connection to powered buses (e.g., 3.3-V backplane) while the local supply is off, preventing latch-up or damage. The Ioff specification (±10 µA) confirms leakage remains within safe limits under these conditions.
How does the DOC™ circuitry in SN74AVCB164245 improve signal integrity compared to standard bus transceivers?
The DOC™ circuitry in SN74AVCB164245 dynamically lowers output impedance during signal transitions to deliver peak current (±24 mA), then raises it to limit ringing and crosstalk. Unlike fixed-drive transceivers, this reduces simultaneous switching noise by up to 40% while maintaining timing performance - validated by TI's SCEA009 application report and confirmed in SN74AVCB164245's VOL/VOH vs. IOL/IOH curves.
Can SN74AVCB164245 be used for unidirectional level translation only, and how is that configured?
Yes - SN74AVCB164245 supports unidirectional operation by holding DIR constant (e.g., DIR = L for B→A only) and using OE to gate data flow. For true unidirectional use, tie unused port inputs to VCC or GND per SCBA004 guidelines. This configuration maintains full 1.4-V to 3.6-V translation range and preserves tpd < 2 ns, making SN74AVCB164245 suitable for clock distribution or static control signal translation.
What is the recommended pull-up resistor value for OE when connecting to VCCB in SN74AVCB164245?
Texas Instruments specifies OE should be tied to VCCB via a pull-up resistor to ensure high-impedance state during power-up. Minimum resistance is determined by the driver's current-sinking capability: for VCCB = 3.3 V and IOH = 2.5 µA (max II), a 100-kΩ resistor provides sufficient margin while minimizing quiescent current. Values between 10 kΩ and 470 kΩ are commonly used in production designs per TI's SCES394D recommendations.
Does SN74AVCB164245 support hot-swap insertion into a live backplane, and what design considerations apply?
Yes - SN74AVCB164245 supports hot-swap via its Ioff circuitry and overvoltage-tolerant I/O. When VCCA is initially 0 V, both ports enter high-Z state immediately, preventing backfeed. Designers must ensure OE is pulled to VCCB before VCCA ramps, and use series resistors (22–100 Ω) on data lines to limit inrush current. TI validates this behavior per JESD78 Class II latch-up testing (>100 mA).
SN74AVCB164245DGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- Packaging:
- Tube
- Product Status:
- Active
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AVCB164245DGG FAQ
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7.What is the process for return or replacement of SN74AVCB164245DGG?
All SN74AVCB164245DGG units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCB164245DGG, 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 SN74AVCB164245DGG part is unused and in its original packaging.
Return procedure for SN74AVCB164245DGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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