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Texas Instruments SN74AVCAH164245VR
- Part No.:
- SN74AVCAH164245VR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCAH164245VR.pdf
- Description:
- IC TRANSLATOR BIDIR 48TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVCAH164245VR 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 Ioff partial-power-down protection, bus-hold on all data inputs, and DOC™ dynamic output control enabling ±24-mA drive without speed penalty. It supports asynchronous data transfer in mixed-voltage system interconnects such as FPGA-to-ASIC or SoC-to-peripheral interfaces.
For engineers reviewing the SN74AVCAH164245VR datasheet, SN74AVCAH164245VR pinout, SN74AVCAH164245VR application, or SN74AVCAH164245VR equivalent, key selection criteria include dual-rail voltage flexibility (VCCA/VCCB = 1.4–3.6 V), guaranteed 3-state isolation during power sequencing, bus-hold elimination of external resistors, and verified 1.4-ns minimum propagation delay at 3.3-V operation.
Technical Context
The SN74AVCAH164245VR implements a fully configurable dual-rail architecture: A-port logic levels track VCCA (1.4–3.6 V), B-port tracks VCCB (1.4–3.6 V), and control inputs (DIR, OE) are referenced solely to VCCA. This enables deterministic voltage translation across any combination of 1.5-V, 1.8-V, 2.5-V, and 3.3-V buses without direction-control voltage translation circuitry.
Its DOC™ (Dynamic Output Control) circuitry dynamically modulates output impedance-initially low for fast edge drive, then raised to suppress switching noise-while maintaining full ±24-mA drive capability. Bus-hold circuitry actively sustains unused data inputs at valid logic levels, eliminating external biasing and reducing board-level component count.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA/VCCB) | 1.4 V to 3.6 V per rail - enables direct interface between 1.5-V, 1.8-V, 2.5-V, and 3.3-V logic domains without external level shifters. |
| Propagation Delay (tpd) | 1.4 ns (min) at VCCA = VCCB = 3.3 V - ensures sub-2-ns timing margin for high-speed synchronous bus handshaking. |
| Output Drive (IOH/IOL) | ±24 mA at 2.5-V VCC - delivers standard-output strength while supporting heavy capacitive loads up to 50 pF. |
| Ioff Current | ±10 µA max when either VCC = 0 V - prevents backflow current during partial power-down, protecting powered subsystems. |
| Bus-Hold Input Current (IBHH/IBHL) | ±75 µA min at 3-V VCC - actively maintains valid logic state on floating inputs, removing need for pullup/pulldown resistors. |
| Input/Output Clamp Voltage | –0.5 V to VCC + 0.5 V - allows overvoltage-tolerant operation during hot-insertion or supply sequencing mismatches. |
| Power Dissipation Capacitance (CpdA) | 14 pF (enabled), 7 pF (disabled) - quantifies dynamic power consumption per transceiver channel at 10 MHz toggle rate. |
Pinout & Package
SN74AVCAH164245VR uses a 48-pin TVSOP (DGV) package, 3.6 mm × 12.5 mm body, 0.4-mm pitch, 1.2-mm max height, JEDEC MO-153 compliant. Pin 1 located in Q1 quadrant per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (active-high) | Determines data flow direction per octal section: DIR = L → B→A; DIR = H → A→B. |
| 1OE, 2OE | Output enable input (active-low) | Drives corresponding 8-bit port into high-impedance state when high; ties to VCCA via pullup for safe power-up. |
| 1A1–1A8, 2A1–2A8 | A-port data I/O (bidirectional) | Track VCCA supply; accept/receive data referenced to VCCA logic thresholds. |
| 1B1–1B8, 2B1–2B8 | B-port data I/O (bidirectional) | Track VCCB supply; accept/receive data referenced to VCCB logic thresholds. |
| VCCA, VCCB | Independent power rails | VCCA powers control inputs and A-port logic; VCCB powers B-port logic - no internal coupling. |
| GND | Ground reference | Four dedicated GND pins (pins 4, 10, 15, 21) minimize ground bounce across dual-rail operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.4–3.6-V operation on A and B ports enables seamless 1.8-V ↔ 3.3-V, 2.5-V ↔ 1.5-V, or any mixed-voltage bus bridging. |
| DOC™ dynamic output control | Reduces simultaneous switching noise by 30% vs fixed-drive outputs while maintaining ±24-mA peak drive and <2-ns tpd. |
| Integrated bus-hold circuitry | Eliminates external pullup/pulldown resistors on all 16 data lines - reduces BOM count, PCB area, and signal integrity risk from stubs. |
| Ioff partial-power-down protection | Enables safe hot-swap and power-gating: if VCCA or VCCB = 0 V, both ports enter high-Z state with <10-µA leakage. |
| Overvoltage-tolerant I/O | Withstands –0.5 V to VCC+0.5 V on any I/O pin - supports robust operation during supply sequencing faults or hot-plug events. |
Applications
| FPGA-to-Memory Interface | Multi-Voltage SoC Interconnect |
|---|---|
|
Use Scenario: Bridging a 1.8-V FPGA I/O bank to a 3.3-V parallel SRAM or NOR flash memory bus. IC Role / Device Role / Timing Role: Bidirectional level translator providing cycle-accurate address/data/control transfer with sub-2-ns tpd and guaranteed 3-state isolation during reset. Use Value: Eliminates discrete level-shifter ICs and external biasing, reducing interconnect latency and layout complexity while ensuring timing closure at 100-MHz bus rates. |
Use Scenario: Connecting a 2.5-V CPU core domain to 1.5-V DDR2 SDRAM controller and 3.3-V peripheral UART/I²C block. IC Role / Device Role / Timing Role: Dual-octal transceiver partitioning voltage domains - one section for CPU↔SDRAM, another for CPU↔peripherals - with independent DIR/OE control. Use Value: Enables single-chip voltage domain isolation with no timing skew between sections, simplifying power sequencing and reducing cross-domain noise coupling. |
| Hot-Swappable Backplane Module | Industrial PLC I/O Expansion |
|
Use Scenario: Isolating a field-replaceable module's 3.3-V logic from a 2.5-V backplane controller during insertion/removal. IC Role / Device Role / Timing Role: Ioff-enabled transceiver that enters high-Z state automatically when VCCB drops to 0 V, preventing backfeed into live backplane rails. Use Value: Meets IEC 61000-4-2 Level 4 ESD immunity (±15-kV air, ±8-kV contact) and eliminates need for mechanical interlocks or sequenced power connectors. |
Use Scenario: Interfacing a 1.8-V microcontroller unit to legacy 24-V digital input modules and 5-V analog output DACs in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-translating buffer with bus-hold on all inputs - maintains valid logic states during sensor cable disconnect or transient EMI bursts. Use Value: Prevents spurious I/O toggling during industrial noise events, improving system reliability without software debouncing overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH16T245DGGR | Supports 1.2–3.6-V rails but lacks DOC™ circuitry and bus-hold; higher typical tpd (2.1 ns min at 3.3 V). | Lower noise immunity in high-speed parallel buses; requires external pullups on unused inputs. | Select when cost sensitivity outweighs noise reduction and board-space constraints. |
| TXB0108PWR | 8-bit, auto-direction sensing, 1.2–3.6-V rails; no DIR/OE pins; lower drive (±2 mA) and higher tpd (6.2 ns typ). | Unidirectional use only; unsuitable for synchronous bidirectional protocols like SRAM or DDR. | Select only for simple GPIO expansion where direction is software-determined and speed <25 MHz. |
Compared with SN74AVCH16T245DGGR and TXB0108PWR, the SN74AVCAH164245VR uniquely combines 16-bit bidirectional control, DOC™ noise suppression, integrated bus-hold, and sub-2-ns timing - making it the only option qualified for high-reliability, mixed-voltage synchronous memory and control bus applications.
Availability
SN74AVCAH164245VR is available at Aetrix Electronics and suitable for FPGA-to-memory interfaces, multi-voltage SoC interconnects, hot-swappable backplane modules, and industrial PLC I/O expansion requiring stable component supply across extended temperature ranges.
Supply support for SN74AVCAH164245VR 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 SN74AVCAH164245VR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for low-latency, noise-resilient voltage translation in high-density mixed-signal systems.
FAQ
What is the maximum operating temperature range for the SN74AVCAH164245VR?
The SN74AVCAH164245VR is rated for operation from –40°C to +85°C ambient temperature, validated across its full 1.4-V to 3.6-V VCCA and VCCB supply range. This industrial-grade thermal specification ensures reliable performance in embedded controllers, networking equipment, and factory automation systems where ambient temperatures exceed commercial limits.
Does the SN74AVCAH164245VR require external pullup resistors on DIR or OE pins?
No - the SN74AVCAH164245VR control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCA and do not require external pullups for functional operation. However, TI recommends tying OE to VCCA via a pullup resistor during power-up to guarantee high-impedance state before VCCA stabilizes; minimum resistance depends on driver sink capability.
Can the SN74AVCAH164245VR translate between 1.2-V and 3.3-V logic levels?
No - the SN74AVCAH164245VR specifies a minimum VCCA and VCCB of 1.4 V. While some margin may exist, TI does not characterize or guarantee operation below 1.4 V. For 1.2-V domain interfacing, consider the SN74AVCH16T245 or SN74LVC16T245, which support 1.2-V rails.
How does the DOC™ circuitry in the SN74AVCAH164245VR reduce noise without sacrificing speed?
The DOC™ circuitry in the SN74AVCAH164245VR dynamically lowers output impedance at signal transition onset to deliver full ±24-mA drive for fast edge rates, then raises impedance mid-transition to damp ringing and overshoot. This achieves <2-ns propagation delay while cutting simultaneous switching noise by up to 30% compared to fixed-drive outputs.
Is the SN74AVCAH164245VR pin-compatible with the SN74AVCB164245?
No - the SN74AVCAH164245VR and SN74AVCB164245 are not pin-compatible. The SN74AVCB164245 uses a different pinout (e.g., DIR/OE placement) and lacks bus-hold and DOC™ features. Migration requires PCB layout revision and firmware validation due to functional and timing differences.
SN74AVCAH164245VR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCAH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 8
- Voltage - VCCA:
- 1.4 V ~ 3.6 V
- Voltage - VCCB:
- 1.4 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TFSOP (0.173", 4.40mm Width)
SN74AVCAH164245VR FAQ
1.How can I place an order for SN74AVCAH164245VR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCAH164245VR 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 SN74AVCAH164245VR reliable?
The price and inventory of SN74AVCAH164245VR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCAH164245VR is usually 5 days.
3.What payment methods are accepted for SN74AVCAH164245VR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCAH164245VR transactions.
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4.How is shipping managed for SN74AVCAH164245VR?
SN74AVCAH164245VR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCAH164245VR 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 SN74AVCAH164245VR?
For technical support, including SN74AVCAH164245VR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCAH164245VR requirements.
6.How does Aetrix verify that SN74AVCAH164245VR is sourced from the original manufacturer or authorized distributors?
All SN74AVCAH164245VR 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 SN74AVCAH164245VR meets industry standards.
7.What is the process for return or replacement of SN74AVCAH164245VR?
All SN74AVCAH164245VR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCAH164245VR, 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 SN74AVCAH164245VR part is unused and in its original packaging.
Return procedure for SN74AVCAH164245VR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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