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Texas Instruments SN74ABTH32543PZ
- Part No.:
- SN74ABTH32543PZ
- Manufacturer:
- Texas Instruments
- Package:
- 100-LQFP
- Datasheet:
-
SN74ABTH32543PZ.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
SN74ABTH32543PZ from Texas Instruments is a 36-bit registered bus transceiver with 3-state outputs in a 100-pin LQFP (PZ) package, operating from –40°C to 85°C at 4.5–5.5 V supply. It features dual 18-bit bidirectional data paths with independent latch-enable and output-enable controls per direction, high-drive outputs (–32 mA IOH, 64 mA IOL), and bus-hold on all data inputs - used in high-speed backplane and memory bus interface applications.
For engineers reviewing the SN74ABTH32543PZ datasheet, SN74ABTH32543PZ pinout, SN74ABTH32543PZ application, or SN74ABTH32543PZ equivalent, key selection criteria include registered data flow control, 3-state output timing (tPLH/tPHL ≤ 6.3 ns), bus-hold functionality eliminating external resistors, and compatibility with Widebus+™ system-level bus architectures.
Technical Context
The SN74ABTH32543PZ implements two independent 18-bit D-type latch sections (A↔B), each with dedicated CE, LE, and OE controls enabling asynchronous bidirectional data registration. Its EPIC-II™ BiCMOS process delivers low ground bounce (<0.8 V VOLP) and latch-up immunity >500 mA per JESD-17.
Distributed VCC/GND pins minimize switching noise; bus-hold circuitry maintains valid logic levels on floating inputs without pullup/pulldown resistors; power-up/down high-impedance behavior ensures safe state transitions when VCC is between 0–2.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5-V TTL-compatible systems with margin for rail tolerance |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads and long traces without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 6.3 ns (CL = 50 pF) - enables reliable operation in sub-10-ns timing-critical bus interfaces |
| Bus-Hold Current | ±100 µA at VI = 0.8 V / 2.0 V - actively holds unused inputs at valid logic levels, removing need for external biasing |
| Power-Up State | High-impedance when VCC < 2.1 V - prevents bus contention during power sequencing |
| Package | 100-pin LQFP (PZ), 14 × 14 mm, 0.5-mm pitch - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
SN74ABTH32543PZ uses a 100-pin plastic thin quad flat package (LQFP-PZ) with 14 × 14 mm body, 0.5-mm lead pitch, and exposed thermal pad. Pin numbering follows standard top-view orientation with Pin 1 marked by corner notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A18, 2A1–2A18 | A-side data inputs/outputs | First and second 18-bit data ports for A-to-B or B-to-A transfer; support bidirectional registered flow |
| 1B1–1B18, 2B1–2B18 | B-side data inputs/outputs | Corresponding B-side terminals; paired with A ports for full 36-bit or split 18-bit operation |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip enable (A↔B) | Active-low enables data capture or output per 18-bit section; must be low for register or output action |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch enable (A↔B) | Low enables transparency; rising edge latches data into D-type registers for synchronized transfer |
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output enable (A↔B) | Active-low controls 3-state output drivers; high disables outputs to prevent bus conflicts |
| VCC (Pins 13, 36, 62, 89) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve power integrity across wide bus |
| GND (Pins 14, 37, 63, 90) | Ground reference | Four dedicated GND pins symmetrically placed to minimize ground bounce and loop inductance |
Key Features
| Feature | Design Value |
|---|---|
| Dual 18-bit registered paths | Enables flexible configuration as one 36-bit or two independent 18-bit transceivers with separate control logic |
| Bus-hold on all data inputs | Eliminates external pullup/pulldown resistors, reducing BOM count and board space in sparse-bus or hot-swap scenarios |
| High-impedance during power transition | Prevents bus contention and signal corruption when VCC ramps between 0–2.1 V during startup/shutdown |
| EPIC-II™ BiCMOS process | Reduces dynamic power dissipation vs. standard bipolar while maintaining TTL-compatible voltage thresholds and drive strength |
| Distributed VCC/GND pin layout | Minimizes high-speed switching noise and improves signal integrity on 36-bit parallel buses up to 100 MHz |
Applications
| Backplane Data Interface | Memory Bus Expansion |
|---|---|
Use Scenario: Interfacing processor local bus to modular backplane with multiple plug-in cards requiring synchronized data handshaking. IC Role / Device Role / Timing Role: Registered transceiver providing clock-aligned data capture and 3-state isolation between master and slave slots. Use Value: Dual-latch architecture allows independent A→B and B→A registration, supporting full-duplex backplane protocols without external flip-flops. | Use Scenario: Extending 32-bit SDRAM or SRAM address/data bus across PCB layers or between stacked modules. IC Role / Device Role / Timing Role: Bidirectional registered buffer isolating memory controller from load capacitance of extended trace lengths. Use Value: 64-mA sink capability drives >10 cm of 50-Ω controlled-impedance traces; bus-hold prevents floating states during memory refresh cycles. |
| Industrial PLC I/O Module | Test Equipment Bus Controller |
Use Scenario: Isolating programmable logic controller CPU bus from field I/O expansion racks with varying cable lengths and EMI exposure. IC Role / Device Role / Timing Role: Level-shifting and noise-immune registered transceiver managing deterministic data transfer between isolated domains. Use Value: Latch-enable synchronization eliminates metastability risk; high-impedance power-up state prevents spurious writes during cold start. | Use Scenario: Controlling multi-channel digital pattern generators or logic analyzers where precise timing alignment and bus arbitration are critical. IC Role / Device Role / Timing Role: Registered bus interface synchronizing test vector loading with system clock domain boundaries. Use Value: Sub-7-ns propagation delay and <0.8-V ground bounce ensure setup/hold compliance across 36-bit parallel test buses at 100+ MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT32543PZ | No bus-hold circuitry; lower drive (–24 mA IOH, 48 mA IOL); same pinout and logic function | Suitable only where external pullups are acceptable and load drive requirements are reduced | Select when cost sensitivity outweighs need for bus-hold and higher drive strength |
| SN74ALVCH32543GR | 3.3-V operation only; different pinout (100-pin TQFP-G); includes auto-direction sensing | Designed for mixed-voltage 3.3-V/5-V systems; not drop-in replaceable due to voltage and pin mismatch | Choose for new 3.3-V designs requiring automatic direction control and lower power |
Compared with SN74ABTH32543PZ, SN74ABT32543PZ lacks bus-hold and delivers less current, limiting use in floating-input or high-capacitance environments; SN74ALVCH32543GR operates at 3.3 V with distinct pin mapping and direction-sensing logic, requiring PCB redesign but enabling lower-power, auto-direction applications.
Availability
SN74ABTH32543PZ is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory bus expansion, test equipment controllers, and high-reliability embedded computing systems requiring stable component supply across extended product lifecycles.
Supply support for SN74ABTH32543PZ 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74ABTH32543PZ belongs to TI's Widebus+™ family of high-speed bus interface ICs, designed specifically for noise-resistant, registered data transfer in dense parallel bus architectures such as backplanes, memory subsystems, and modular instrumentation.
FAQ
What is the maximum clock frequency supported by SN74ABTH32543PZ?
The SN74ABTH32543PZ does not contain an internal clock generator but supports synchronous data registration via external control signals. With tPLH/tPHL ≤ 6.3 ns and setup/hold times as low as 1.7 ns, it enables reliable operation in bus systems running up to 100 MHz using externally generated LE and CE strobes. The actual maximum frequency depends on PCB layout, load capacitance, and driver strength - verified in TI's SCBS230F datasheet under CL = 50 pF conditions.
Does SN74ABTH32543PZ require external pullup resistors on its data inputs?
No, SN74ABTH32543PZ does not require external pullup or pulldown resistors on its A- or B-side data inputs because it integrates active bus-hold circuitry. This feature maintains valid logic levels on unused or floating inputs with ±100 µA hold current, as specified in the electrical characteristics table of the SCBS230F datasheet. External resistors are unnecessary unless specific system-level noise immunity requirements exceed the built-in bus-hold margin.
Can SN74ABTH32543PZ operate at 3.3 V?
No, SN74ABTH32543PZ is specified only for 4.5 V to 5.5 V supply operation per its recommended operating conditions. Attempting to run it at 3.3 V violates the minimum VCC requirement and will result in undefined logic behavior, insufficient output drive, and potential failure to meet timing specifications. For 3.3-V systems, consider TI's SN74ALVCH32543GR or similar ALVC-family alternatives explicitly rated for 3.3-V operation.
What is the thermal resistance (θJA) of SN74ABTH32543PZ in the PZ package?
The junction-to-ambient thermal resistance (θJA) of SN74ABTH32543PZ in the 100-pin LQFP (PZ) package is 50°C/W, as stated in the Absolute Maximum Ratings table of the SCBS230F datasheet. This value assumes standard JEDEC 2-layer board mounting per JESD51; actual thermal performance may improve with enhanced copper pour, thermal vias, or heatsinking. The device's EPIC-II™ BiCMOS process inherently reduces power dissipation compared to legacy bipolar implementations.
Is SN74ABTH32543PZ pin-compatible with SN74ABT32543PZ?
Yes, SN74ABTH32543PZ is pin-compatible with SN74ABT32543PZ - both share identical 100-pin LQFP (PZ) footprints, pin functions, and signal assignments. However, SN74ABTH32543PZ adds bus-hold circuitry and higher output drive (–32 mA IOH / 64 mA IOL vs. –24 mA / 48 mA), making it a functional upgrade. No PCB changes are required for replacement, though system-level validation of bus-hold interaction and timing margins is recommended.
SN74ABTH32543PZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- Package/Case:
- 100-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 18
- 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:
- 100-LQFP (14x14)
SN74ABTH32543PZ FAQ
1.How can I place an order for SN74ABTH32543PZ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTH32543PZ 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 SN74ABTH32543PZ reliable?
The price and inventory of SN74ABTH32543PZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH32543PZ is usually 5 days.
3.What payment methods are accepted for SN74ABTH32543PZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABTH32543PZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABTH32543PZ?
SN74ABTH32543PZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTH32543PZ 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 SN74ABTH32543PZ?
For technical support, including SN74ABTH32543PZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTH32543PZ requirements.
6.How does Aetrix verify that SN74ABTH32543PZ is sourced from the original manufacturer or authorized distributors?
All SN74ABTH32543PZ 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 SN74ABTH32543PZ meets industry standards.
7.What is the process for return or replacement of SN74ABTH32543PZ?
All SN74ABTH32543PZ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH32543PZ, 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 SN74ABTH32543PZ part is unused and in its original packaging.
Return procedure for SN74ABTH32543PZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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