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Texas Instruments SN74ALVCH16543DL
- Part No.:
- SN74ALVCH16543DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCH16543DL.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
SN74ALVCH16543DL from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between two 8-bit buses or as a single 16-bit transceiver. It operates from 1.65 V to 3.6 V, features bus-hold circuitry on all data inputs, and supports independent A-to-B and B-to-A control via dedicated latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) pins. It is used in high-density memory interface and backplane buffer applications requiring level translation and register synchronization.
For engineers reviewing the SN74ALVCH16543DL datasheet, SN74ALVCH16543DL pinout, SN74ALVCH16543DL application, or SN74ALVCH16543DL equivalent, key selection considerations include its dual 8-bit register architecture, 3.6 V absolute maximum supply rating, -40°C to 85°C industrial temperature range, bus-hold input retention, and SSOP-56 (DL) package compatibility with legacy board layouts.
Technical Context
The SN74ALVCH16543DL implements two independent 8-bit registered transceiver sections-A-to-B and B-to-A-each with separate CE, LE, and OE controls. Its EPIC™ submicron CMOS process enables low-voltage operation while maintaining TTL-compatible thresholds across 1.65–3.6 V VCC.
Each direction uses transparent latching: when CE is low and LE transitions low-to-high, data is captured; OE then enables 3-state outputs. Bus-hold circuitry actively maintains valid logic levels on unused A/B port inputs without external resistors, eliminating floating-input risks in hot-swap or partial-population scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Operating Temperature | -40°C to +85°C - Qualified for industrial-grade embedded systems and communications equipment. |
| Bus-Hold Current | ±25 µA to ±75 µA - Actively holds floating A/B port inputs at valid logic states, removing need for external pullup/pulldown resistors. |
| Output Drive | ±24 mA at 3 V - Sufficient to drive 50-pF loads with ≤6.5 ns propagation delay, supporting high-speed bus buffering. |
| Input Thresholds | VIH = 0.65×VCC (min), VIL = 0.35×VCC (max) - Ensures robust noise margin across full VCC range. |
| 3-State Leakage | ±10 µA at 3.6 V - Minimizes standby current in disabled output mode, critical for low-power system states. |
| Propagation Delay | 4.3 ns to 6.5 ns (typical, VCC = 2.5–3.3 V) - Supports >100 MHz data rates in synchronous bus interfaces. |
Pinout & Package
SN74ALVCH16543DL is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 13.9 mm × 7.4 mm footprint, 1.2 mm max height, with 0.5 mm lead pitch and RoHS-compliant NiPdAu finish. Pin 1 is marked in top-left corner per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers per 8-bit section; must be low to enable B or A outputs respectively. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | When low and CE low, latches are transparent; rising edge stores data into registers for synchronized output. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data flow: CE must be low for either capture (LE active) or output (OE active) in respective direction. |
| A1–A8, B1–B8 (x2 sections) | Bidirectional Data Ports | Two independent 8-bit I/O banks; each pin functions as input or output depending on direction control signals. |
| VCC, GND (x8 total) | Power Distribution | Dedicated power/ground pairs per functional quadrant reduce switching noise and improve signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-Hold Inputs | Eliminates external pullup/pulldown resistors on all A/B port pins, reducing BOM count and PCB area in sparse-bus or test-point configurations. |
| Independent Dual-Section Control | Separate CE/LE/OE per 8-bit channel allows asymmetric data flow-e.g., A→B latched while B→A is transparent-enabling flexible protocol bridging. |
| High-Noise-Immunity Thresholds | Input voltage thresholds scale with VCC (VIH ≥ 0.65×VCC), ensuring reliable operation across mixed-voltage systems without recalibration. |
| Hot-Swap Safe Outputs | 3-state outputs enter high-impedance state during power-up/down when OE is tied to VCC via pullup resistor, preventing bus contention. |
| ESD Robustness | Exceeds 2000 V HBM and 200 V machine model-validated for handling in automated assembly and field-replaceable module environments. |
Applications
| Memory Interface Buffering | Backplane Data Multiplexing |
|---|---|
Use Scenario: Isolating and synchronizing data between a 16-bit microcontroller bus and parallel flash memory with timing skew. IC Role / Device Role / Timing Role: Registered transceiver providing setup/hold time margin and clock-aligned data capture on both read and write cycles. Use Value: Eliminates external latch ICs and reduces timing closure effort by integrating registration and 3-state control in one DL-package device. | Use Scenario: Sharing a single 16-bit data path among multiple processor modules in a modular industrial controller chassis. IC Role / Device Role / Timing Role: Bidirectional bus isolator with independent direction control per 8-bit lane, enabling concurrent A→B and B→A transfers. Use Value: Reduces backplane pin count by 50% versus discrete unidirectional buffers while supporting hot-swap-safe isolation via OE-controlled high-Z state. |
| Legacy System Voltage Translation | FPGA I/O Expansion |
Use Scenario: Interfacing a 3.3 V FPGA I/O bank to a 1.8 V ASIC subsystem with mismatched voltage thresholds. IC Role / Device Role / Timing Role: Level-translating registered transceiver operating at intermediate VCC (2.5 V) to meet VIH/VIL requirements of both sides. Use Value: Achieves voltage translation without external bias networks or direction-control logic, leveraging built-in scalable thresholds. | Use Scenario: Expanding limited FPGA I/O count to drive external peripherals using a shared 16-bit parallel interface. IC Role / Device Role / Timing Role: Registered I/O expander with bus-hold inputs retaining last valid state during FPGA configuration or reset. Use Value: Prevents peripheral glitches during FPGA reconfiguration by holding control/data lines stable without external latches or pull resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16543DGGR | TSSOP-56 (DGG) package; 2.4 mm width vs. DL's 7.4 mm; identical electrical specs and pinout. | Suitable for high-density PCBs where footprint area is constrained but height budget allows TSSOP. | Select DGGR for automated placement efficiency and thermal performance; DL preferred for legacy SSOP tooling and mechanical compatibility. |
| SN74LVCH16543DL | Lower drive strength (±12 mA vs. ±24 mA); higher VOL/VOH thresholds; same pinout and package. | Better suited for ultra-low-power systems where 3.3 V operation is not required and reduced speed is acceptable. | Choose LVCH variant only if system load capacitance is <30 pF and timing margin exceeds 8 ns; ALVCH remains optimal for full-speed 3.3 V buses. |
Compared with SN74ALVCH16543DGGR and SN74LVCH16543DL, the SN74ALVCH16543DL delivers highest output drive and widest VCC range in the SSOP-56 form factor-making it the default choice for industrial backplanes and memory interfaces requiring robust 3.3 V operation and mechanical backward compatibility.
Availability
SN74ALVCH16543DL is available at Aetrix Electronics and suitable for memory interface buffering, backplane data multiplexing, legacy system voltage translation, and FPGA I/O expansion requiring stable component supply and long-term industrial availability.
Supply support for SN74ALVCH16543DL 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 50 years of innovation in high-reliability interface and logic devices.
The SN74ALVCH16543DL belongs to TI's Widebus™ family of advanced bus-interface ICs, engineered specifically for high-speed, low-voltage bidirectional data transfer in space-constrained industrial and communications systems.
FAQ
What is the recommended power-up sequence for SN74ALVCH16543DL to avoid bus contention?
TI specifies that OE pins must be held high (via pullup to VCC) during power-up and power-down to ensure outputs remain in high-impedance state. For SN74ALVCH16543DL, connect each OEAB/OEBA pin to VCC through a 10-kΩ resistor. This prevents unintended driver activation before control logic stabilizes, eliminating risk of bus conflict in multi-device systems.
Does SN74ALVCH16543DL support hot-swap insertion while powered?
Yes-SN74ALVCH16543DL incorporates design features enabling safe hot-swap: its 3-state outputs enter high-Z when OE is high, and bus-hold circuitry maintains valid logic levels on floating inputs. When inserted into a live backplane, the device avoids injecting noise or contention, provided OE pins are externally pulled up and VCC ramp rate meets TI's 100 ms max recommendation.
Can SN74ALVCH16543DL operate reliably at 1.65 V VCC with full timing specifications?
Yes-SN74ALVCH16543DL is fully characterized down to 1.65 V. At this minimum VCC, propagation delay increases to 6.5 ns (vs. 4.3 ns at 3.3 V), and output drive drops to ±4 mA, but all AC/DC parameters-including setup/hold times and bus-hold current-meet datasheet limits across -40°C to 85°C. No derating is required.
How does bus-hold functionality work on SN74ALVCH16543DL, and what is its effective holding current?
SN74ALVCH16543DL uses internal feedback transistors to weakly reinforce the last-valid logic state on each A/B port input. Holding current ranges from ±25 µA at 1.65 V to ±75 µA at 3.0 V-sufficient to counteract typical PCB leakage (<1 µA) and EMI-induced noise without loading the driving source. No external components are needed.
Is SN74ALVCH16543DL pin-compatible with older 74-series transceivers like SN74ACT16543?
No-SN74ALVCH16543DL is not pin-compatible with SN74ACT16543. While both are 16-bit registered transceivers, ACT16543 uses a 56-pin SOIC package with different pin assignments (e.g., VCC/GND distribution, control signal placement). The SN74ALVCH16543DL pinout is unique to the ALVCH family and matches only SN74ALVCH16543 variants in DL/DGG packages.
SN74ALVCH16543DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ALVCH16543DL FAQ
1.How can I place an order for SN74ALVCH16543DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH16543DL 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 SN74ALVCH16543DL reliable?
The price and inventory of SN74ALVCH16543DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16543DL is usually 5 days.
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SN74ALVCH16543DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH16543DL 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 SN74ALVCH16543DL?
For technical support, including SN74ALVCH16543DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16543DL requirements.
6.How does Aetrix verify that SN74ALVCH16543DL is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH16543DL 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 SN74ALVCH16543DL meets industry standards.
7.What is the process for return or replacement of SN74ALVCH16543DL?
All SN74ALVCH16543DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16543DL, 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 SN74ALVCH16543DL part is unused and in its original packaging.
Return procedure for SN74ALVCH16543DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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