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Texas Instruments SN74ALVCH162409DL
- Part No.:
- SN74ALVCH162409DL
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74ALVCH162409DL.pdf
- Description:
- BUS EXCHANGER
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Product details
Overview
SN74ALVCH162409 from Texas Instruments is a 9-bit, 4-port universal bus exchanger IC designed for synchronous bidirectional data exchange between four independent buses in 1.65-V to 3.6-V systems. It features glitch-free data-flow control via five select inputs (SEL0–SEL4), clocked storage on rising CLK edge, and immediate 3-state output disable via PRE. Used in high-density memory-mapped I/O and multi-processor interconnects.
For engineers reviewing the SN74ALVCH162409 datasheet, SN74ALVCH162409 pinout, SN74ALVCH162409 application, or SN74ALVCH162409 equivalent, key selection criteria include its UBE architecture, integrated 26-Ω B-port series termination, bus-hold on all data inputs, -40°C to 85°C operation, and DL-package compatibility with space-constrained board layouts.
Technical Context
The SN74ALVCH162409 implements a universal bus exchanger (UBE) architecture enabling configurable bidirectional data routing among four ports (1A/2A/1B/2B) under synchronous control. Its data-flow state is latched on the rising edge of CLK when SELEN is low, and held when SELEN is high - supporting both dynamic reconfiguration and static path locking.
Each B-port output integrates an equivalent 26-Ω series resistor to suppress overshoot/undershoot without external components, while all A- and B-port data inputs feature active bus-hold circuitry eliminating external pullup/pulldown resistors. PRE provides asynchronous, clock-independent output disable.
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 3.3-V logic domains. |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded and communications equipment. |
| B-Port Output Drive | 12 mA sink capability with built-in 26-Ω series resistance - eliminates need for external termination on B-side traces. |
| Bus-Hold Current | ±25 µA to ±75 µA (VCC-dependent) - maintains valid logic levels on floating data inputs without external biasing. |
| Output Enable Delay (tdis) | Typ. 3.5 ns at VCC = 3.3 V - enables fast, deterministic bus release during arbitration or mode switching. |
| Propagation Delay (tpd) | Typ. 3.2 ns at VCC = 3.3 V - supports >200 MHz clock rates in synchronous exchange paths. |
| ESD Rating | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 and JESD22 requirements for robust board-level handling. |
Pinout & Package
SN74ALVCH162409 is packaged in a 56-pin plastic shrink small-outline (DL) package with 300-mil body width and 0.025-inch lead pitch. The package is RoHS-compliant and thermally rated at θJA = 74°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PRE | Asynchronous Output Disable | Forces all outputs into high-impedance state immediately upon high transition - no clock dependency required for fail-safe shutdown. |
| CLK | Clock Input | Rising-edge-triggered latch control for data-flow configuration and flip-flop storage - defines timing boundary for synchronous exchange. |
| SELEN | Select Enable | When low, allows SEL0–SEL4 to define new data path; when high, freezes current path configuration until next CLK edge. |
| SEL0–SEL4 | Data Path Select Inputs | Five-bit encoding selects one of 32 possible bidirectional port pairings (e.g., 1A↔1B, 2A↔2B, 1A↔2B, etc.) per clock cycle. |
| 1A1–1A9, 2A1–2A9 | A-Port Data I/O | 9-bit bidirectional data terminals for Port 1A and Port 2A - support high-speed address/data multiplexing in memory subsystems. |
| 1B1–1B9, 2B1–2B9 | B-Port Data I/O | 9-bit bidirectional data terminals for Port 1B and Port 2B - include internal 26-Ω series termination to reduce signal integrity issues. |
Key Features
| Feature | Design Value |
|---|---|
| Universal Bus Exchanger (UBE) Architecture | Enables real-time, clock-synchronized reconfiguration of 9-bit data paths among four ports - eliminates need for discrete muxes and glue logic. |
| Integrated 26-Ω B-Port Series Termination | Reduces PCB trace reflections and EMI without requiring external resistors - simplifies layout and improves signal fidelity on B-side lines. |
| Active Bus-Hold on All Data Inputs | Maintains stable logic states on unused or unterminated A/B port pins - prevents floating-input-induced glitches and system lockup. |
| Glitch-Free Data-Flow Control Logic | Ensures monotonic state transitions during SEL input changes - avoids metastability or transient bus contention during path reconfiguration. |
| Asynchronous PRE with Immediate Disable | Guarantees sub-nanosecond output disable independent of clock phase - critical for safe bus arbitration and hot-swap isolation. |
Applications
| Memory-Mapped I/O Bridge | Multi-Processor Interconnect |
|---|---|
|
Use Scenario: Connecting two microprocessors to shared peripheral registers and status memory locations via time-multiplexed address/data buses. IC Role / Device Role / Timing Role: SN74ALVCH162409 acts as a synchronous bidirectional bus exchanger, dynamically routing 9-bit register access paths between CPU A and CPU B under software-controlled SEL inputs. Use Value: Eliminates need for dual-port RAM or arbitration logic; enables deterministic, low-latency register sharing with <3.5 ns disable delay and glitch-free path switching. |
Use Scenario: Enabling peer-to-peer data exchange between two DSPs operating at different clock domains in a radar signal processing module. IC Role / Device Role / Timing Role: SN74ALVCH162409 serves as a clock-domain crossing buffer, synchronizing 9-bit coefficient transfers using local CLK and SELEN-controlled path locking. Use Value: Provides sub-4 ns propagation delay and bus-hold stability on floating inputs - ensures reliable handshaking without external synchronization logic. |
| Configurable Backplane Interface | Legacy Bus Extension Hub |
|
Use Scenario: Extending a 9-bit ISA-compatible control bus across a modular backplane with hot-pluggable daughter cards. IC Role / Device Role / Timing Role: SN74ALVCH162409 functions as a programmable bus repeater, selecting between front-panel I/O and rear-slot expansion paths via SEL inputs driven by FPGA configuration logic. Use Value: Integrated 26-Ω B-port termination reduces stub reflections on long backplane traces; PRE allows safe insertion/removal without bus contention. |
Use Scenario: Adapting a legacy 9-bit parallel printer interface to modern microcontroller GPIO banks with voltage-level flexibility. IC Role / Device Role / Timing Role: SN74ALVCH162409 operates as a level-translating bus exchanger, translating between 3.3-V MCU I/O and 5-V tolerant printer signals via VCC = 3.3 V and bus-hold stabilization. Use Value: 1.65–3.6-V VCC range and ±12 mA drive support direct connection to 3.3-V logic; bus-hold prevents spurious interrupts from unconnected printer handshake lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar universal bus exchanger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH162245DL | 16-bit, 2-port transceiver with direction control (DIR), no SEL logic or UBE functionality; lacks bus-hold and integrated B-port termination. | Suitable only for fixed-direction, point-to-point data transfer - cannot replicate dynamic 4-port path selection or synchronous exchange behavior. | Choose SN74ALVCH162245DL only when bidirectional data flow is unidirectional per transaction and path configuration is static. |
| SN74LVC16245ADL | 16-bit, 2-port transceiver with DIR control; operates down to 1.65 V but lacks SEL inputs, PRE, bus-hold, and B-port series resistors. | Requires external logic for path selection and pullup resistors for floating inputs; no glitch-free data-flow control or asynchronous disable. | Use SN74LVC16245ADL only in cost-sensitive, low-complexity designs where 4-port flexibility and robustness are not required. |
Compared with SN74ALVCH162245DL and SN74LVC16245ADL, the SN74ALVCH162409 uniquely delivers programmable 4-port routing, clock-synchronized path locking, and integrated signal integrity features - making it irreplaceable in systems requiring dynamic bus topology reconfiguration.
Availability
SN74ALVCH162409 is available at Aetrix Electronics and suitable for memory-mapped I/O bridges, multi-processor interconnects, and configurable backplane interfaces requiring stable component supply, long-term industrial lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SN74ALVCH162409 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 for industrial, automotive, and communications markets.
The SN74ALVCH162409 belongs to TI's Widebus+™ family of high-speed, low-voltage bus interface devices, engineered for glitch-free, multi-port data exchange in space-constrained, mixed-voltage embedded systems.
FAQ
What is the primary function of the SN74ALVCH162409 in a digital system?
The SN74ALVCH162409 functions as a 9-bit, 4-port universal bus exchanger that enables synchronous, bidirectional data routing between four independent buses. Its UBE architecture uses SEL0–SEL4 inputs and a rising-edge CLK to configure data paths (e.g., 1A↔2B or 1B↔2A) without external logic. This makes SN74ALVCH162409 ideal for dynamic bus sharing in multi-processor or memory-mapped I/O systems where path flexibility and timing determinism are critical.
How does the PRE pin affect the operation of the SN74ALVCH162409?
The PRE (Preset) pin on the SN74ALVCH162409 provides asynchronous, clock-independent control over output states: when PRE transitions high, all outputs immediately enter high-impedance mode regardless of CLK or SELEN status. To exit high-impedance, both PRE and SELEN must be low and a rising CLK edge must occur. For power-up safety, TI recommends tying PRE to VCC via a pullup resistor - ensuring outputs remain disabled until firmware initializes the device. This behavior is integral to SN74ALVCH162409's role in fault-tolerant bus architectures.
Does the SN74ALVCH162409 require external pullup or pulldown resistors on its data inputs?
No, the SN74ALVCH162409 does not require external pullup or pulldown resistors on any data inputs (1A1–1A9, 2A1–2A9, 1B1–1B9, 2B1–2B9) because it integrates active bus-hold circuitry on all those pins. This feature maintains unused or floating inputs at valid logic levels using ±25 µA to ±75 µA holding current (depending on VCC), preventing undefined states and system instability. This design element is explicitly confirmed in the datasheet and eliminates a common source of noise and misbehavior in high-density PCB layouts using SN74ALVCH162409.
What is the significance of the 26-Ω series resistance on the B-port outputs of the SN74ALVCH162409?
The B-port outputs of the SN74ALVCH162409 integrate an equivalent 26-Ω series resistor to dampen signal reflections and suppress overshoot/undershoot on PCB traces - a feature confirmed in the datasheet's EPIC process description. This eliminates the need for discrete 22–33 Ω series termination resistors typically placed near drivers. As a result, SN74ALVCH162409 reduces component count, saves board area, and improves signal integrity in high-speed 9-bit data paths routed to B-side peripherals or backplane connectors.
Can the SN74ALVCH162409 operate reliably across different supply voltages?
Yes, the SN74ALVCH162409 is fully specified to operate across a 1.65-V to 3.6-V VCC range, supporting interoperability between LVTTL, ALVC, and 3.3-V logic families. Its VIH/VIL thresholds scale with VCC (e.g., VIH = 0.65×VCC min at 1.65 V, 2.0 V min at 3.6 V), and output drive strength scales accordingly (IOL up to 24 mA at VCC = 3.0 V). This voltage flexibility is validated across –40°C to 85°C and makes SN74ALVCH162409 suitable for mixed-supply systems where SN74ALVCH162409 interfaces between disparate voltage domains without level shifters.
SN74ALVCH162409DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
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SN74ALVCH162409DL FAQ
1.How can I place an order for SN74ALVCH162409DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH162409DL 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 SN74ALVCH162409DL reliable?
The price and inventory of SN74ALVCH162409DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH162409DL is usually 5 days.
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5.How can I obtain technical support or documentation for SN74ALVCH162409DL?
For technical support, including SN74ALVCH162409DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH162409DL requirements.
6.How does Aetrix verify that SN74ALVCH162409DL is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH162409DL 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 SN74ALVCH162409DL meets industry standards.
7.What is the process for return or replacement of SN74ALVCH162409DL?
All SN74ALVCH162409DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH162409DL, 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 SN74ALVCH162409DL part is unused and in its original packaging.
Return procedure for SN74ALVCH162409DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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