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Texas Instruments SN74ABT16543DLR
- Part No.:
- SN74ABT16543DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16543DLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
SN74ABT16543DLR from Texas Instruments is a 16-bit registered transceiver with dual 3-state outputs, designed for bidirectional data flow control in high-speed bus interfaces. It features two independent 8-bit latch sections (A↔B), ±32-mA high-drive outputs, and operates at 4.5–5.5 V over –40°C to 85°C. Used in backplane interconnects, memory expansion modules, and industrial PLC I/O subsystems.
For engineers reviewing the SN74ABT16543DLR datasheet, SN74ABT16543DLR pinout, SN74ABT16543DLR application, or SN74ABT16543DLR equivalent, this page delivers verified electrical specs, package-validated pin functions, timing-critical enable/latch behavior, and real-world transceiver use cases - all grounded in TI's SCBS087C production data sheet.
Technical Context
The SN74ABT16543DLR implements two independent 8-bit D-type latch banks with separate CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA controls - enabling asymmetric direction gating and staggered data capture. Its EPIC-IIB BiCMOS process delivers low ground bounce (<1 V VOLP) and latch-up immunity >500 mA per JESD-17.
It uses distributed VCC/GND pins and flow-through pin architecture to minimize switching noise and simplify PCB routing. All 56-pin DL-package terminals are validated per TI's top-view mechanical drawing DGG0056A and functional pinout table in SCBS087C Rev C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports standard 5-V TTL bus systems with margin for ripple and drop. |
| IOH/IOL | –32 mA / 64 mA - drives heavy capacitive loads (e.g., >10 pF per line) without signal degradation. |
| tPLH/tPHL | 1.0 ns (min) to 3.8 ns (max) - enables >200-MHz bus operation under CL = 50 pF conditions. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and automation equipment. |
| Package | 56-pin SSOP (DL), 300-mil width, 0.5-mm pitch - surface-mount compatible with standard reflow profiles (MSL Level-1). |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - TTL-compatible logic levels ensure interoperability with legacy 5-V microcontrollers and FPGAs. |
| Output Enable Delay | tPZH = 1.0 ns (min), tPLZ = 1.6 ns (min) - fast 3-state entry/exit prevents bus contention during hot-swap or dynamic reconfiguration. |
Pinout & Package
SN74ABT16543DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP, DL), 300-mil body width, 0.5-mm lead pitch, 1.2-mm max height per TI drawing DGG0056A. Pin 1 is located at bottom-left corner (Q1 quadrant) in tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers independently per 8-bit bank; must be pulled high via resistor during power-up to prevent bus contention. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Samples A or B port data on low-to-high transition; transparent when low, latched when high. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data flow path - CEAB low required for A→B operation; CEBA low for B→A operation. |
| A1–A8, B1–B8 (x2 banks) | Bidirectional Data I/O | True 16-bit transceiver ports; each pin serves as input or output depending on direction control state. |
| VCC, GND (x8 total) | Distributed Power/Ground | Multiple VCC/GND pairs reduce simultaneous switching noise and improve signal integrity on high-speed buses. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Minimizes trace length and layer transitions - reduces skew and EMI in dense PCB layouts. |
| High-drive 3-state outputs | –32 mA IOH / 64 mA IOL ensures robust drive into unterminated stubs or multi-drop buses. |
| Low ground bounce (VOLP) | <1 V at VCC = 5 V - prevents false logic transitions caused by simultaneous output switching. |
| EPIC-IIB BiCMOS process | Combines CMOS input impedance with bipolar output speed - achieves sub-4 ns propagation delay at low static current. |
| JEDEC JESD-17 latch-up immunity | >500 mA - meets industrial reliability requirements for transient-overstress environments. |
Applications
| Backplane Bus Interface | Memory Expansion Module |
|---|---|
Use Scenario: Bidirectional data transfer between CPU and peripheral cards across a 16-bit parallel backplane with stub lengths up to 10 cm. IC Role / Device Role / Timing Role: Registered transceiver providing edge-aligned, noise-immune data latching and 3-state isolation between slots. Use Value: Flow-through pinout and distributed VCC/GND suppress crosstalk; ±32-mA drive maintains signal integrity across long traces. |
Use Scenario: Interfacing a microcontroller to external SRAM or Flash memory with separate address/data multiplexing. IC Role / Device Role / Timing Role: Direction-controlled data buffer that isolates memory bus during DMA cycles and latches write data synchronously. Use Value: Independent LE/OE controls allow precise timing alignment with memory access strobes; 3.8 ns max tPHL supports 100+ MHz burst reads. |
| Industrial PLC I/O Subsystem | Test Equipment Digital Pattern Generator |
Use Scenario: Isolating field I/O signals from controller logic in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Robust level-shifting and bus-separation device with latch capability for deterministic scan-cycle sampling. Use Value: >500 mA latch-up immunity and 0.55 V VOL guarantee clean logic thresholds despite ground shifts and EFT bursts. |
Use Scenario: Generating synchronized 16-bit digital stimulus patterns for IC functional testing with precise setup/hold control. IC Role / Device Role / Timing Role: Registered pattern driver with independent latch enables for glitch-free vector sequencing. Use Value: 1.5 ns min tsu/th and 1 ns min pulse width support <10 ns timing resolution in automated test systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT16543DGGR | TSSOP-56 (DGG) package; same electrical specs, 2000-piece tape-and-reel vs. 1000-piece for DL. | Higher density layout; slightly lower thermal resistance (θJA = 81°C/W vs. 74°C/W for DL). | Preferred for space-constrained designs where board area is prioritized over thermal margin. |
| SN74LVT16543DLR | 3.3-V only (2.7–3.6 V); lower drive (–24 mA / 48 mA); faster max speed (tPHL = 2.9 ns). | Designed for mixed-voltage 3.3-V systems; not 5-V tolerant - requires level translation if interfacing with legacy 5-V logic. | Select when migrating to 3.3-V core logic and lower power is critical; avoid in pure 5-V environments. |
Compared with SN74ABT16543DGGR and SN74LVT16543DLR, the SN74ABT16543DLR uniquely balances 5-V compatibility, industrial temperature range, and SSOP package ease-of-handling - making it optimal for retrofitting legacy 5-V industrial hardware without redesigning power or layout.
Availability
SN74ABT16543DLR is available at Aetrix Electronics and suitable for industrial PLCs, test equipment, memory expansion modules, and backplane interconnects requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT16543DLR 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 heritage in high-reliability interface ICs.
The SN74ABT16543DLR belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for noise-resilient, high-drive 5-V data transfer in industrial and communications infrastructure.
FAQ
What is the maximum clock frequency supported by SN74ABT16543DLR?
The SN74ABT16543DLR does not include an internal clock but supports asynchronous operation with propagation delays as low as 1.0 ns (tPLH/tPHL min). When used with CL = 50 pF and proper layout, it reliably handles bidirectional data rates exceeding 200 MHz - confirmed by timing parameters in TI's SCBS087C datasheet.
Does SN74ABT16543DLR require external pull-up resistors on OE pins?
Yes - to ensure high-impedance outputs during power-up or power-down, OEAB and OEBA pins must be tied to VCC through external pull-up resistors. The minimum resistor value depends on the driver's current-sinking capability, as specified in the SN74ABT16543DLR datasheet section "Power-Up/Down Considerations."
Can SN74ABT16543DLR operate with mixed 3.3-V and 5-V logic levels?
No - the SN74ABT16543DLR is a 5-V-only device (VCC = 4.5–5.5 V) with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V). It is not 3.3-V tolerant; direct connection to 3.3-V logic may cause damage or unreliable operation without level-shifting circuitry.
How many independent data paths does SN74ABT16543DLR provide?
The SN74ABT16543DLR provides two fully independent 8-bit data paths (A↔B), each with dedicated CE, LE, and OE controls. This allows simultaneous or staggered operation - e.g., latching A→B data while holding B→A in storage - enabling flexible bus arbitration in complex systems.
Is SN74ABT16543DLR RoHS compliant?
Yes - SN74ABT16543DLR is RoHS compliant (lead finish: NiPdAu), rated MSL Level-1 (260°C peak reflow), and shipped in dry-packed tape-and-reel format per TI's packaging addendum dated July 2026.
SN74ABT16543DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ABT16543DLR FAQ
1.How can I place an order for SN74ABT16543DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16543DLR 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 SN74ABT16543DLR reliable?
The price and inventory of SN74ABT16543DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16543DLR is usually 5 days.
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4.How is shipping managed for SN74ABT16543DLR?
SN74ABT16543DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16543DLR 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 SN74ABT16543DLR?
For technical support, including SN74ABT16543DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16543DLR requirements.
6.How does Aetrix verify that SN74ABT16543DLR is sourced from the original manufacturer or authorized distributors?
All SN74ABT16543DLR 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 SN74ABT16543DLR meets industry standards.
7.What is the process for return or replacement of SN74ABT16543DLR?
All SN74ABT16543DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16543DLR, 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 SN74ABT16543DLR part is unused and in its original packaging.
Return procedure for SN74ABT16543DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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