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Texas Instruments SN74ALVCHR16245LR
- Part No.:
- SN74ALVCHR16245LR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCHR16245LR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,707
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Product details
Overview
SN74ALVCHR16245LR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It features ±12-mA output drive at 3.3 V, 4.2-ns max propagation delay, integrated 26-Ω series resistors on all outputs, and bus-hold circuitry eliminating external pullup/pulldown resistors. It is used in high-speed digital backplanes and memory interface subsystems.
For engineers reviewing the SN74ALVCHR16245LR datasheet, SN74ALVCHR16245LR pinout, SN74ALVCHR16245LR application, or SN74ALVCHR16245LR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), 3-state isolation timing (ten/tdis ≤ 6.8 ns), bus-hold input retention, and SSOP-48 package footprint constraints.
Technical Context
The SN74ALVCHR16245LR implements two independent 8-bit transceiver sections, each controlled by dedicated DIR (direction) and OE (output enable) inputs. Direction control is asynchronous and level-sensitive: DIR = L routes B-bus data to A-bus; DIR = H routes A-bus data to B-bus.
Each I/O port includes active bus-hold circuitry that maintains valid logic states on undriven inputs, and all outputs integrate 26-Ω series termination to suppress signal overshoot/undershoot without external components. The device meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing across LVTTL, ALVC, and low-voltage CMOS domains |
| tpd Max | 4.2 ns at 3.3 V - enables sub-250-MHz bidirectional bus operation with tight timing margins |
| Output Drive | ±12 mA at 3.3 V - drives standard 50-Ω transmission lines or multiple CMOS loads without buffering |
| Series Resistor | 26 Ω integrated per output - eliminates need for discrete series termination resistors on PCB |
| Bus-Hold Current | ±45 µA at 3 V - actively retains logic state on floating inputs, preventing metastability in unconnected stubs |
| IOZ Leakage | ±10 µA at 3.6 V - ensures robust high-impedance isolation during OE disable, critical for bus arbitration |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
Pinout & Package
SN74ALVCHR16245LR is packaged in a 48-pin SSOP (DL) with 0.5-mm pitch, 12.6 mm × 6.2 mm body, and 1.2-mm max height. Pin 1 identifier is marked in top-left corner of package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Level-sensitive logic: LOW = B→A data flow; HIGH = A→B data flow; no internal debouncing |
| 1OE, 2OE | Output enable input (active-low, per section) | Drives all 8 outputs into high-impedance when HIGH; tie to VCC via pullup for power-up isolation |
| 1A1–1A8, 2A1–2A8 | Port A data inputs/outputs | Bi-directional I/O pins for first and second 8-bit bus segment; support bus-hold and 26-Ω series termination |
| 1B1–1B8, 2B1–2B8 | Port B data inputs/outputs | Bi-directional I/O pins mirroring Port A; electrically identical, independently controllable per DIR/OE pair |
| VCC, GND | Power supply and ground | Four VCC and six GND pins distributed across package - reduce simultaneous switching noise and improve PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 26-Ω series termination | Eliminates 16 discrete SMT resistors, reduces PCB area and layout complexity for signal integrity compliance |
| Active bus-hold on all data inputs | Maintains stable logic levels on unterminated or disconnected traces, preventing false switching in hot-swap or partial-population scenarios |
| Wide VCC range (1.65–3.6 V) | Enables direct interfacing between 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters |
| Low propagation delay (4.2 ns @ 3.3 V) | Supports high-throughput data transfers in memory buffers, FPGA I/O expansion, and protocol bridging applications |
| High ESD immunity (2000-V HBM) | Withstands handling and board-level electrostatic discharge without protection diodes or external TVS devices |
Applications
| Memory Interface Expansion | FPGA I/O Bridging |
|---|---|
Use Scenario: Expanding DRAM or SRAM data bus width between controller and memory module using shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional 16-bit transceiver isolating memory-side and controller-side buses during read/write cycles. Use Value: Integrated 26-Ω termination and bus-hold ensure clean signal edges and stable idle states without added components, reducing BOM count and routing congestion. | Use Scenario: Interfacing heterogeneous logic families (e.g., 1.8-V FPGA I/O banks to 3.3-V peripheral ASICs). IC Role / Device Role / Timing Role: Voltage-tolerant level translator and bus isolator enabling synchronous data exchange across voltage domains. Use Value: 1.65–3.6-V operation and ±12-mA drive allow direct connection to FPGA I/Os and legacy peripherals without external level-shifting ICs. |
| Industrial Backplane Data Routing | Hot-Swappable Module Communication |
Use Scenario: Routing parallel control/status data across modular chassis backplanes with varying slot power sequencing. IC Role / Device Role / Timing Role: Isolating hot-plugged module buses from main backplane during insertion/removal using OE-controlled 3-state mode. Use Value: Power-up OE isolation behavior (with VCC pullup) prevents bus contention during staggered power application across modules. | Use Scenario: Maintaining valid logic states on unused I/O pins of removable compute cards during insertion or removal. IC Role / Device Role / Timing Role: Bus-hold circuitry actively retaining last valid logic level on undriven inputs during mechanical disconnect. Use Value: Eliminates risk of floating inputs causing spurious interrupts or latch-up in host controllers, improving system reliability during field maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16245T | Same core logic but in 56-pin TSSOP (DGG) package; identical electrical specs and pinout mapping per functional group | Requires PCB redesign due to different footprint (56-pin vs. 48-pin), larger body size, and altered thermal pad layout | Select when higher thermal dissipation margin is required or when board layout accommodates larger TSSOP package |
| SN74LVC16245ADGGR | Lower drive strength (±24 mA @ 3.3 V), no integrated series resistors, no bus-hold; operates 1.65–3.6 V | Needs external 33-Ω series resistors and pullup/pulldown networks for clean signal integrity and idle-state stability | Select when cost sensitivity outweighs BOM simplification, and design team manages termination and biasing externally |
Compared with SN74ALVCHR16245LR, SN74ALVCH16245T offers identical functionality in a physically larger package with better thermal performance, while SN74LVC16245ADGGR requires additional passive components to match the integrated signal integrity and input retention features of the ALVCHR variant.
Availability
SN74ALVCHR16245LR is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, memory subsystems, and hot-swappable module designs requiring stable component supply across extended product lifecycles.
Supply support for SN74ALVCHR16245LR 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74ALVCHR16245LR belongs to TI's Widebus™ family of high-speed logic devices, engineered specifically for low-voltage, high-density bus interface applications demanding minimal external components and robust signal integrity.
FAQ
What is the recommended power-up sequence for SN74ALVCHR16245LR to avoid bus contention?
To prevent bus contention during power-up, OE must be held HIGH (inactive) until VCC reaches stable operating voltage. TI recommends tying OE to VCC through a pullup resistor - minimum value determined by driver sink capability. This ensures all outputs remain in high-impedance state until system initialization completes. The SN74ALVCHR16245LR does not include internal power-on reset, so external sequencing remains essential for reliable SN74ALVCHR16245LR operation in multi-rail systems.
Does SN74ALVCHR16245LR support mixed-voltage operation between its A and B ports?
No - the SN74ALVCHR16245LR has a single VCC supply pin shared across all I/Os and logic. Both A and B ports operate at the same VCC voltage (1.65–3.6 V). It does not provide level translation between different voltage domains; for mixed-voltage interfacing, external level shifters or devices like SN74AVC16T245 must be used alongside SN74ALVCHR16245LR.
Can bus-hold circuitry on SN74ALVCHR16245LR be disabled?
No - bus-hold is permanently enabled on all data inputs of SN74ALVCHR16245LR and cannot be disabled via control pin or configuration. TI explicitly advises against using external pullup/pulldown resistors with bus-hold inputs, as they conflict with the internal retention current (±45 µA at 3 V) and may cause excessive power draw or logic instability. The SN74ALVCHR16245LR relies entirely on this feature for idle-state integrity.
What is the maximum data rate supported by SN74ALVCHR16245LR in practical PCB layouts?
Based on 4.2-ns max propagation delay and integrated 26-Ω series termination, SN74ALVCHR16245LR supports clean signal edges up to ~250 Mbps (125 MHz DDR) on well-designed 50-Ω controlled-impedance traces. Real-world throughput depends on trace length, stubs, and load capacitance - TI characterizes timing with CL = 50 pF. For >15-cm routing or >10-pF net capacitance, derating below 200 Mbps is recommended to maintain SN74ALVCHR16245LR signal integrity.
Is SN74ALVCHR16245LR RoHS compliant and lead-free?
Yes - SN74ALVCHR16245LR is RoHS compliant and uses NiPdAu (NIPDAU) lead finish per TI's packaging documentation. It carries MSL Level-1 rating (unlimited floor life at <30°C/60% RH) and is qualified for peak reflow temperatures up to 260°C. The SSOP (DL) package contains no lead-based solder or exemptions; full compliance documentation is available in TI's Package Option Addendum for SN74ALVCHR16245LR.
SN74ALVCHR16245LR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCHR
- Package/Case:
- 48-BSSOP (0.295", 7.50mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74ALVCHR16245LR FAQ
1.How can I place an order for SN74ALVCHR16245LR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCHR16245LR 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 SN74ALVCHR16245LR reliable?
The price and inventory of SN74ALVCHR16245LR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCHR16245LR is usually 5 days.
3.What payment methods are accepted for SN74ALVCHR16245LR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCHR16245LR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVCHR16245LR?
SN74ALVCHR16245LR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCHR16245LR 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 SN74ALVCHR16245LR?
For technical support, including SN74ALVCHR16245LR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCHR16245LR requirements.
6.How does Aetrix verify that SN74ALVCHR16245LR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCHR16245LR 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 SN74ALVCHR16245LR meets industry standards.
7.What is the process for return or replacement of SN74ALVCHR16245LR?
All SN74ALVCHR16245LR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCHR16245LR, 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 SN74ALVCHR16245LR part is unused and in its original packaging.
Return procedure for SN74ALVCHR16245LR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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