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Texas Instruments SN74ALVCH16543DGGR
- Part No.:
- SN74ALVCH16543DGGR
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74ALVCH16543DGGR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
SN74ALVCH16543 from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between two 8-bit buses in 1.65-V to 3.6-V systems. It features independent A-to-B and B-to-A latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, bus-hold circuitry on all data inputs, and operates across –40°C to 85°C. It is used in high-density memory interface and backplane buffer applications requiring level translation and register synchronization.
For engineers reviewing the SN74ALVCH16543 datasheet, SN74ALVCH16543 pinout, SN74ALVCH16543 application, or SN74ALVCH16543 equivalent, key selection considerations include dual 8-bit register control, bus-hold input stabilization, 3-state output drive capability up to ±24 mA at 3 V, and TSSOP-56 packaging compatibility with space-constrained PCB layouts.
Technical Context
The SN74ALVCH16543 implements two independent 8-bit registered transceiver sections-A↔B and B↔A-each with dedicated CE (chip enable), LE (latch enable), and OE (output enable) inputs. Data latching occurs on low-to-high transitions of LE when CE is asserted low, enabling synchronous capture before 3-state output activation.
Its EPIC™ submicron CMOS process delivers rail-to-rail input thresholds (VIH/VIL scaling with VCC), bus-hold circuitry eliminating external pull resistors, and ESD protection exceeding 2000 V (MIL-STD-883) and 200 V (machine model). Latch-up immunity exceeds 250 mA per JESD 17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing (e.g., 1.8-V logic driving 3.3-V bus) |
| Output Drive | ±24 mA at VCC = 3 V - sufficient to drive 50-pF loads with <7 ns propagation delay in typical conditions |
| Propagation Delay (tpd) | 4.3 ns (VCC = 3.3 V) - enables high-speed register-to-bus transfer in timing-critical interfaces |
| Bus-Hold Current | ±75 µA at VCC = 3 V - actively holds floating inputs at valid logic levels without external components |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| Input Capacitance (Ci) | 3.5 pF - minimizes signal loading on upstream drivers and preserves edge integrity |
| Power Dissipation (Cpd) | 64 pF (outputs enabled, VCC = 3.3 V) - enables accurate dynamic power estimation in high-frequency operation |
Pinout & Package
TSSOP-56 package (DGG), 13.9 mm × 6.1 mm × 1.2 mm max height, lead-free NiPdAu finish, MSL Level-1, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers independently per 8-bit section; must be low to enable B or A outputs respectively |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Samples A or B data into internal registers on low-to-high transition when corresponding CE is low |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Enables data capture path: CE must be low for LE to affect latching or for OE to activate outputs |
| A1–A8, B1–B8 (x2 sections) | Bidirectional data I/O | 16 total I/O pins grouped as two 8-bit ports; each pin has bus-hold and 3-state output capability |
| VCC, GND (x8) | Power distribution | Multiple VCC/GND pairs minimize switching noise and ensure stable operation across full 16-bit width |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit register control | Enables simultaneous or staggered A↔B and B↔A data transfers without cross-talk or timing conflict |
| Integrated bus-hold on all data inputs | Eliminates need for 32 external pullup/pulldown resistors, reducing BOM count and board area |
| Wide VCC range (1.65 V to 3.6 V) | Supports direct interfacing between 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters |
| Low propagation delay (4.3 ns @ 3.3 V) | Meets setup/hold timing for >100-MHz bus cycles when paired with compatible clocking |
| High ESD/latch-up robustness | 2000-V HBM ESD rating and >250-mA latch-up immunity ensure reliability in manufacturing and field environments |
Applications
| Memory Interface Buffer | Backplane Data Transceiver |
|---|---|
|
Use Scenario: Isolating and synchronizing address/data between a 16-bit microcontroller and parallel SRAM or Flash memory. IC Role / Device Role / Timing Role: Registered transceiver providing controlled, glitch-free data handoff with latch synchronization and 3-state isolation during bus arbitration. Use Value: Prevents bus contention during read/write transitions and eliminates need for external bus-hold resistors on 16 data lines. |
Use Scenario: Bidirectional data routing between two independent 8-bit peripheral modules on a shared backplane. IC Role / Device Role / Timing Role: Dual-section transceiver enabling independent A→B and B→A data flow with separate enable controls per direction. Use Value: Allows asynchronous communication between subsystems while maintaining signal integrity via low-capacitance I/O and rail-compatible thresholds. |
| Industrial PLC I/O Expansion | FPGA-to-ASIC Interface Bridge |
|
Use Scenario: Extending FPGA-based controller I/O to legacy 8-bit parallel peripherals (e.g., ADCs, DACs, displays). IC Role / Device Role / Timing Role: Level-translating registered buffer that captures FPGA outputs and presents clean, held signals to slower peripherals. Use Value: Compensates for timing skew between FPGA clock domain and peripheral access timing using programmable latch enables. |
Use Scenario: Interfacing a high-speed FPGA fabric to an ASIC with strict input setup/hold requirements and limited drive strength. IC Role / Device Role / Timing Role: Registered repeater that retimes and strengthens signals, adding deterministic latency while meeting VIH/VIL thresholds across voltage domains. Use Value: Ensures reliable signal capture at ASIC inputs by providing ±24 mA drive and bus-hold stabilization against floating states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16543DGGR | Lower drive (±24 mA only at VCC ≥ 2.7 V); no bus-hold; 1.65–3.6-V operation same | Requires external pull resistors on unused inputs; less robust in noisy or floating-input environments | Preferred where cost reduction outweighs bus-hold requirement and layout allows discrete resistors |
| 74ALVCH162245DGGR | Non-latched, 16-bit 3-state bus transceiver; no register functionality; identical VCC range and pinout | Used for simple direction-controlled pass-through, not for synchronized sampling or hold timing | Select when data flow is purely combinatorial and no intermediate storage or timing alignment is needed |
Compared with SN74ALVCH16543, SN74LVC16543 lacks bus-hold and requires external biasing, while 74ALVCH162245 omits latching entirely-making SN74ALVCH16543 uniquely suited for applications demanding both registered capture and floating-input resilience.
Availability
SN74ALVCH16543 is available at Aetrix Electronics and suitable for memory interface buffers, industrial PLC I/O expansion, FPGA-to-ASIC bridges, and backplane data transceivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ALVCH16543 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 decades of experience in high-reliability industrial and automotive IC design.
The SN74ALVCH16543 belongs to TI's Widebus™ family of advanced logic devices, engineered specifically for high-speed, low-voltage bidirectional bus interfacing in space-constrained industrial and communications systems.
FAQ
What is the function of the CE (chip enable) inputs on the SN74ALVCH16543?
The CEAB and CEBA inputs on the SN74ALVCH16543 are active-low chip enables that gate the entire data path for their respective direction: CEAB must be low to allow A-to-B latching or B-output activation, and CEBA must be low for B-to-A operation. When CE is high, the associated latches ignore LE transitions and outputs remain in high-impedance state regardless of OE status-providing hardware-level isolation between bus segments. This behavior is explicitly defined in the FUNCTION TABLE on page 4 of the SCES025E datasheet.
Does the SN74ALVCH16543 support hot-insertion or power sequencing?
Yes-the SN74ALVCH16543 incorporates design features to support safe power sequencing: its outputs default to high-impedance during power-up/down when OE is uncontrolled, and the datasheet recommends tying OE to VCC via a pullup resistor to guarantee this state. The absolute maximum ratings also permit input voltages up to VCC + 0.5 V, allowing inputs to be driven before VCC stabilizes. These characteristics make SN74ALVCH16543 suitable for hot-swap backplane and modular system designs.
How does bus-hold circuitry work on the SN74ALVCH16543, and what current does it source/sink?
The SN74ALVCH16543 integrates active bus-hold circuitry on all A and B port inputs, which detects floating conditions and drives the pin to the last-valid logic state using weak feedback transistors. Per Electrical Characteristics (page 5), the bus-hold current is ±75 µA at VCC = 3 V-sufficient to override typical leakage but low enough to avoid contention with actively driven signals. This eliminates the need for 32 external pull resistors while maintaining noise margin in unterminated stubs or disconnected ports.
Can the SN74ALVCH16543 be used as a single 16-bit transceiver, or only as two independent 8-bit units?
The SN74ALVCH16543 can operate flexibly as either two independent 8-bit transceivers or one unified 16-bit unit-the functional description explicitly states "can be used as two 8-bit transceivers or one 16-bit transceiver." Control signals (CEAB/CEBA, LEAB/LEBA, OEAB/OEBA) are fully duplicated per 8-bit section, enabling independent timing and direction control. No internal coupling restricts coordinated use; designers may tie control inputs together for 16-bit operation or keep them separate for split-bus applications.
What is the maximum clock frequency supported by the SN74ALVCH16543 for reliable register operation?
The SN74ALVCH16543 does not contain an internal clock but relies on externally generated LE and CE edges for register capture. Its timing specifications define minimum pulse widths (tw ≥ 3.3 ns) and setup/hold times (tsu/th ≥ 1.2 ns), supporting effective data rates exceeding 100 MHz when driven by clean, low-skew control signals. Propagation delay (tpd = 4.3 ns @ 3.3 V) and enable/disable times (ten/tdis ≤ 7.2 ns) confirm suitability for systems with ≤10 ns cycle budgets-common in high-speed parallel memory and FPGA interconnect applications.
SN74ALVCH16543DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm 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:
- 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-TSSOP
SN74ALVCH16543DGGR FAQ
1.How can I place an order for SN74ALVCH16543DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH16543DGGR 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 SN74ALVCH16543DGGR reliable?
The price and inventory of SN74ALVCH16543DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16543DGGR is usually 5 days.
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Once your SN74ALVCH16543DGGR 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 SN74ALVCH16543DGGR?
For technical support, including SN74ALVCH16543DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16543DGGR requirements.
6.How does Aetrix verify that SN74ALVCH16543DGGR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH16543DGGR 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 SN74ALVCH16543DGGR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH16543DGGR?
All SN74ALVCH16543DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16543DGGR, 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 SN74ALVCH16543DGGR part is unused and in its original packaging.
Return procedure for SN74ALVCH16543DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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