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Texas Instruments SN74LVCHR16245AVR
- Part No.:
- SN74LVCHR16245AVR
- Manufacturer:
- Texas Instruments
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCHR16245AVR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
SN74LVCHR16245AVR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between mixed-voltage buses (1.65 V–3.6 V VCC). It features 5.5-V-tolerant inputs, integrated 26-Ω output series resistors, bus-hold circuitry on all data I/Os, and Ioff support for live insertion and partial power-down. It enables level translation in telecom infrastructure backplanes.
For engineers reviewing the SN74LVCHR16245AVR datasheet, SN74LVCHR16245AVR pinout, SN74LVCHR16245AVR application, or SN74LVCHR16245AVR equivalent, key selection criteria include its 4.8 ns max propagation delay at 3.3 V, dual independent DIR/OE control per 8-bit section, 125°C operating temperature rating, and TVSOP-48 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVCHR16245AVR implements two independent 8-bit transceiver sections-each with dedicated direction (DIR) and output-enable (OE) controls-allowing simultaneous A→B and B→A data flow under separate logic supervision. Its bus-hold circuitry actively maintains valid logic states on floating inputs without external resistors, while Ioff blocks current flow when VCC = 0 V.
All 32 I/O pins (16 A-side, 16 B-side) are 5.5-V tolerant regardless of VCC (1.65–3.6 V), enabling robust down-translation from 5-V peripherals to 3.3-V or 1.8-V system buses. Output drivers integrate 26-Ω series resistance to suppress overshoot/undershoot, eliminating need for external termination in point-to-point or lightly loaded stub applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 1.65 V to 3.6 V - Supports single-supply operation across 1.8-V, 2.5-V, and 3.3-V logic domains |
| Max Propagation Delay (tpd) | 4.8 ns at VCC = 3.3 V - Enables high-speed data transfer in ≤200-MHz bus systems |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct interfacing with legacy 5-V TTL/CMOS without level-shifter ICs |
| Output Series Resistance | 26 Ω (integrated) - Reduces signal ringing and EMI without requiring external series resistors |
| Bus-Hold Current | ±45 µA at VCC = 3 V - Maintains stable logic state on unused/floating I/Os; eliminates pullup/pulldown resistors |
| Ioff Leakage | ±10 µA at VCC = 0 V - Prevents back-drive current during hot-swap or partial power-down sequences |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and telecom infrastructure environments |
Pinout & Package
SN74LVCHR16245AVR is packaged in a 48-pin Thin Very Small Outline Package (TVSOP), body size 9.70 mm × 4.40 mm, with 0.4-mm lead pitch. The package supports fine-pitch routing and automated assembly in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction Control Input | Determines data flow direction per 8-bit section: DIR = L → B→A; DIR = H → A→B |
| 1OE, 2OE | Output Enable Input | Active-low control: OE = L enables transceiver; OE = H places both A and B ports in high-impedance state |
| 1A1–1A8, 2A1–2A8 | Data I/O Port A | First and second octal data port; bidirectional, 5.5-V tolerant, bus-hold enabled |
| 1B1–1B8, 2B1–2B8 | Data I/O Port B | Corresponding bidirectional B-side ports with identical electrical characteristics as A-side |
| VCC (Pins 7, 18, 31, 42) | Power Supply | Four distributed VCC pins reduce supply impedance and improve noise immunity |
| GND (Pins 4, 10, 15, 21, 28, 34, 39, 45) | Ground Reference | Eight GND pins provide low-inductance return paths for all I/O and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5.5-V-tolerant inputs enable interoperability between 5-V, 3.3-V, 2.5-V, and 1.8-V subsystems without external translators |
| Integrated 26-Ω output series resistors | Eliminates need for discrete series termination resistors, reducing BOM count and PCB area in high-speed bus designs |
| Bus-hold on all data I/Os | Actively holds floating inputs at valid logic levels, preventing metastability and eliminating external pullup/pulldown networks |
| Ioff partial power-down protection | Blocks current flow when VCC = 0 V, enabling safe live insertion and back-drive prevention in modular systems |
| Low ground bounce (VOLP < 0.8 V) | Minimizes switching noise coupling into shared ground planes, critical for mixed-signal integrity in dense layouts |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between 5-V legacy line cards and 3.3-V control plane processors in carrier-grade chassis. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing synchronous parallel data transfers across voltage-domain boundaries. Use Value: Eliminates discrete level shifters and termination resistors, reducing interconnect complexity and improving signal integrity at 100+ Mbps rates. |
Use Scenario: Isolating and translating sensor/actuator signals between 24-V field-side I/O modules and 3.3-V microcontroller-based logic units. IC Role / Device Role / Timing Role: Robust bidirectional interface with bus-hold and Ioff, ensuring deterministic behavior during power sequencing and fault conditions. Use Value: Prevents floating inputs during module hot-swap and maintains bus stability without external biasing components. |
| Server Memory Subsystem | Test & Measurement Equipment |
Use Scenario: Interfacing DDR memory controller (1.8-V/1.5-V) with 3.3-V buffer/driver stages in high-bandwidth memory channel architectures. IC Role / Device Role / Timing Role: Low-latency, matched-delay transceiver supporting burst-mode read/write operations with sub-5-ns timing margins. Use Value: Integrated 26-Ω resistors dampen reflections on unterminated stubs, preserving eye diagram integrity at multi-Gbps effective data rates. |
Use Scenario: Configurable signal routing between 5-V DUT interfaces and 3.3-V FPGA-based test pattern generators in automated test equipment. IC Role / Device Role / Timing Role: Programmable direction-controlled bus isolator enabling flexible stimulus/response path reconfiguration. Use Value: Dual DIR/OE controls allow independent management of two 8-bit lanes, simplifying firmware-driven test vector sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245A | Lacks bus-hold and Ioff; 5-V-tolerant inputs only up to VCC + 0.5 V (not 5.5 V absolute) | Suitable for same-voltage domain buffering only; not recommended for mixed-voltage or hot-swap use cases | Select SN74LVCHR16245AVR when bus-hold, Ioff, or true 5.5-V input tolerance is required |
| SN74AVC16245 | Lower VCC range (1.2–3.6 V); higher speed (tpd = 3.2 ns @ 3.3 V); no integrated series resistors | Better for ultra-low-voltage, high-frequency applications but requires external termination and external hold resistors | Choose SN74LVCHR16245AVR when integrated termination and bus-hold simplify layout and reduce component count |
Compared with SN74LVC16245A and SN74AVC16245, the SN74LVCHR16245AVR uniquely combines 5.5-V input tolerance, integrated 26-Ω output resistors, and active bus-hold in a single 48-pin TVSOP package-reducing design risk in mixed-voltage, high-reliability industrial and telecom systems.
Availability
SN74LVCHR16245AVR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, server memory subsystems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCHR16245AVR 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 delivering analog and embedded processing solutions, with over 50 years of innovation in logic, interface, and power management ICs.
The SN74LVCHR16245AVR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for high-reliability, mixed-voltage data communication in telecom, industrial automation, and computing infrastructure.
FAQ
What voltage levels can the SN74LVCHR16245AVR inputs tolerate?
The SN74LVCHR16245AVR inputs accept voltages up to 5.5 V regardless of VCC level (1.65–3.6 V), enabling direct connection to 5-V TTL or CMOS outputs without external level-shifting circuitry. This capability is explicitly specified in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official datasheet.
Does the SN74LVCHR16245AVR require external pullup or pulldown resistors on unused I/Os?
No. The SN74LVCHR16245AVR includes active bus-hold circuitry on all data I/O pins, which maintains valid logic states on floating inputs without external resistors. Using external pullups or pulldowns with the SN74LVCHR16245AVR is not recommended and may interfere with bus-hold functionality.
What is the maximum propagation delay of the SN74LVCHR16245AVR at 3.3 V?
The maximum propagation delay (tpd) of the SN74LVCHR16245AVR is 4.8 ns when VCC = 3.3 V, as measured under standard load conditions (CL = 50 pF, ΔV = ±0.3 V). This value is guaranteed across the full operating temperature range (–40°C to +125°C).
How does the Ioff feature of the SN74LVCHR16245AVR support live insertion?
The Ioff feature in the SN74LVCHR16245AVR disables output drivers and blocks current flow when VCC = 0 V, preventing damaging back-drive current from powered subsystems into unpowered boards. This allows safe hot-plug operation in modular telecom and server chassis where the SN74LVCHR16245AVR serves as an interface bridge.
What package type is used for the SN74LVCHR16245AVR?
The SN74LVCHR16245AVR uses a 48-pin Thin Very Small Outline Package (TVSOP), designated as DGV, with dimensions of 9.70 mm × 4.40 mm and 0.4-mm lead pitch. This package is optimized for high-density PCB layouts and automated surface-mount assembly.
SN74LVCHR16245AVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCHR
- Package/Case:
- 48-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TVSOP
SN74LVCHR16245AVR FAQ
1.How can I place an order for SN74LVCHR16245AVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCHR16245AVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74LVCHR16245AVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCHR16245AVR is usually 5 days.
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Once your SN74LVCHR16245AVR order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74LVCHR16245AVR?
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6.How does Aetrix verify that SN74LVCHR16245AVR is sourced from the original manufacturer or authorized distributors?
All SN74LVCHR16245AVR 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 SN74LVCHR16245AVR meets industry standards.
7.What is the process for return or replacement of SN74LVCHR16245AVR?
All SN74LVCHR16245AVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCHR16245AVR, 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 SN74LVCHR16245AVR part is unused and in its original packaging.
Return procedure for SN74LVCHR16245AVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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