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Texas Instruments SN74ABT16952DLR
- Part No.:
- SN74ABT16952DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16952DLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,090
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Product details
Overview
SN74ABT16952DLR from Texas Instruments is a 16-bit registered transceiver with 3-state outputs in a 56-pin SSOP (DL) package, operating from –40°C to 85°C at 4.5–5.5 V supply. It supports bidirectional data flow via dual 8-bit or unified 16-bit configurations, features high-drive outputs (–32 mA IOH, 64 mA IOL), and includes clock-enable and output-enable controls for precise bus timing in backplane and memory interface applications.
For engineers reviewing the SN74ABT16952DLR datasheet, SN74ABT16952DLR pinout, SN74ABT16952DLR application, or SN74ABT16952DLR equivalent, key selection criteria include registered data synchronization, 3-state bus isolation, latch-up immunity (>500 mA), distributed VCC/GND layout support, and compatibility with Widebus™-optimized PCB routing.
Technical Context
The SN74ABT16952DLR implements two independent sets of D-type flip-flops-one for A-to-B and one for B-to-A data paths-each controlled by dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) inputs. Its EPIC-II™B BiCMOS process enables low ground bounce (<1 V VOLP) and high-speed operation up to 150 MHz.
It uses flow-through architecture with distributed power/ground pins to minimize switching noise, and supports level-sensitive latching on clock rising edges only when corresponding clock-enable is low. Output impedance in high-Z state is specified at ±50 µA (IOZH/IOZL), ensuring robust bus contention control during hot-swap or partial-power-down scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and LVTTL systems without level-shifting. |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded and communications equipment environments. |
| Max Clock Frequency | 150 MHz - supports high-throughput data transfer in synchronous bus architectures like VME or custom backplanes. |
| Output Drive Strength | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., >10 pF per line) while maintaining signal integrity across long traces. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns (VCC = 5 V, CL = 50 pF) - enables sub-5-ns timing margins in tightly synchronized register-to-register transfers. |
| Latch-Up Immunity | >500 mA per JEDEC JESD-17 - prevents destructive latch-up during transient overvoltage or ESD events in ruggedized systems. |
| Input Transition Rate | 10 ns/V - tolerates slow-rising control signals without false triggering, easing integration with microcontroller GPIOs. |
Pinout & Package
SN74ABT16952DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, with 0.025-inch (0.635 mm) lead pitch and Q1 pin-1 orientation in tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers per 8-bit port; must be pulled high via resistor during power-up to ensure Hi-Z default state. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register clock input (rising-edge triggered) | Samples data from A or B bus into D-flip-flops only when corresponding CLKEN is low; defines synchronous data capture timing. |
| 1CLKENAB, 2CLKENAB, 1CLKENBA, 2CLKENBA | Clock enable (active-low) | Gates clock propagation to registers; allows dynamic pausing of data latching without stopping system clock. |
| A1–A8, B1–B8 (x2 sets) | Bidirectional data I/O ports | Each pair (e.g., 1A1/1B1) forms a single transceiver channel; direction determined by OE and CLKEN polarity logic per port group. |
| VCC, GND (x8 each) | Distributed power/ground | Multiple VCC/GND pins interleaved across package reduce simultaneous switching noise and improve PDN impedance for high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout architecture | Enables straight-line PCB trace routing between A and B buses, minimizing stub length and signal reflections in parallel bus layouts. |
| High-drive 3-state outputs | –32 mA source / 64 mA sink capability maintains logic levels under heavy fanout (≥10 loads) without external buffers. |
| Distributed VCC/GND configuration | Eight VCC and eight GND pins placed strategically suppress ground bounce (VOLP < 1 V) and supply droop during full-bus switching. |
| EPIC-II™B BiCMOS process | Combines bipolar speed with CMOS low static power, achieving <2 mA ICC (outputs disabled) while sustaining 150-MHz operation. |
| Widebus™ family compatibility | Shares timing models, drive strength, and pinout conventions with TI's 16-bit Widebus transceivers, simplifying migration and reuse of layout/IP. |
Applications
| Backplane Data Routing | Memory Interface Buffering |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and peripheral cards in modular industrial controllers using passive backplanes. IC Role / Device Role / Timing Role: Registered transceiver synchronizing asynchronous module handshakes to a common system clock, isolating voltage domains via 3-state control. Use Value: Eliminates metastability risk during hot-insertion and enables deterministic setup/hold timing (tsu = 3.5 ns, th = 1 ns) across 16-bit wide data paths. | Use Scenario: Interfacing a microprocessor's multiplexed address/data bus to separate SRAM or Flash memory arrays with independent timing requirements. IC Role / Device Role / Timing Role: Latching and buffering address/data signals with independent A/B port clocks to decouple processor timing from memory access cycles. Use Value: Allows memory read/write operations to occur concurrently with CPU instruction fetches by holding stable data during bus turnaround. |
| Programmable Logic I/O Expansion | Legacy Bus Protocol Translation |
Use Scenario: Extending FPGA I/O count for industrial I/O modules requiring 16-bit parallel sensor or actuator interfaces with precise edge-aligned sampling. IC Role / Device Role / Timing Role: Synchronizing external parallel data streams into FPGA fabric using registered inputs, with OE-controlled tristate for shared bus arbitration. Use Value: Provides deterministic input capture aligned to FPGA clock domain while reducing FPGA pin utilization through consolidated 16-bit register staging. | Use Scenario: Bridging ISA or PC/104 bus peripherals to modern microcontroller-based host systems lacking native legacy bus support. IC Role / Device Role / Timing Role: Translating strobe-driven legacy bus protocols into synchronous register-access patterns compatible with ARM Cortex-M peripherals. Use Value: Enables drop-in replacement of obsolete bus transceivers (e.g., 74F245) while adding clocked registration for improved noise immunity on long ribbon-cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT162245DLR | Non-registered 16-bit transceiver; no internal flip-flops; lower drive (–24 mA IOH, 48 mA IOL); same DL package. | Used where bus loading and direction control are needed but clocked synchronization is unnecessary. | Select when system timing budget allows combinational path delays and no metastability mitigation is required. |
| SN74LVC16245ADGGR | 3.3-V-only operation (1.65–3.6 V); lower drive (–24 mA IOH, 24 mA IOL); TSSOP-48 package; no clock inputs. | Targets low-voltage mixed-signal systems; lacks registration and 5-V tolerance required for legacy bus interfacing. | Choose only for new 3.3-V designs with tight power budgets and no need for 5-V compatibility or clocked data staging. |
Compared with SN74ABT162245DLR and SN74LVC16245ADGGR, the SN74ABT16952DLR uniquely provides registered data capture, 5-V operation, and higher drive strength-making it irreplaceable in synchronous backplane and memory coherency applications where timing determinism and bus loading are critical.
Availability
SN74ABT16952DLR is available at Aetrix Electronics and suitable for industrial backplane interconnects, memory subsystem buffering, programmable logic I/O expansion, and legacy bus protocol translation requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74ABT16952DLR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ABT16952DLR belongs to TI's Widebus™ family of high-speed bus interface ICs, designed specifically for noise-immune, high-fanout data routing in synchronous digital systems requiring precise timing control and robust ESD/latch-up performance.
FAQ
What is the maximum clock frequency supported by the SN74ABT16952DLR?
The SN74ABT16952DLR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating is guaranteed across the full industrial temperature range (–40°C to 85°C) and applies to both CLKAB and CLKBA inputs. Timing parameters such as pulse width (tw ≥ 3.3 ns) and setup/hold times are specified to ensure reliable operation at this rate.
How does the SN74ABT16952DLR handle power-up sequencing to avoid bus contention?
To prevent bus contention during power-up or power-down, the SN74ABT16952DLR requires OEAB and OEBA inputs to be tied to VCC through a pull-up resistor. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends verifying against the device's IOZH specification (±50 µA) to ensure the output remains in high-impedance state until system control logic asserts valid OE signals. This design ensures safe default behavior without external supervision circuitry.
Can the SN74ABT16952DLR be used as two independent 8-bit transceivers?
Yes, the SN74ABT16952DLR can operate as two independent 8-bit registered transceivers. Each half (Ports 1 and 2) has dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls, allowing asynchronous operation of A↔B data paths. This mode is explicitly supported in the function table and logic diagram, enabling flexible partitioning for multi-zone bus architectures or dual-memory-channel buffering.
What is the latch-up immunity rating for the SN74ABT16952DLR?
The SN74ABT16952DLR exceeds 500 mA of latch-up immunity per JEDEC Standard JESD-17. This specification is verified across the full operating temperature range and reflects robustness against transient overcurrent events caused by supply glitches, ESD, or improper hot-plug sequencing. The EPIC-II™B BiCMOS process contributes directly to this high immunity level, making the device suitable for mission-critical industrial and telecom infrastructure.
Does the SN74ABT16952DLR support mixed-voltage operation between A and B ports?
No, the SN74ABT16952DLR does not support mixed-voltage operation. It operates from a single 4.5–5.5 V supply (VCC) and is rated for 5-V TTL-compatible signaling on both A and B ports. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltage levels (VOH ≥ 2.5 V, VOL ≤ 0.55 V) are defined relative to this common VCC rail. Interfacing with 3.3-V or lower-voltage systems requires external level-shifting circuitry.
SN74ABT16952DLR 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
SN74ABT16952DLR FAQ
1.How can I place an order for SN74ABT16952DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16952DLR 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 SN74ABT16952DLR reliable?
The price and inventory of SN74ABT16952DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16952DLR is usually 5 days.
3.What payment methods are accepted for SN74ABT16952DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT16952DLR transactions.
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4.How is shipping managed for SN74ABT16952DLR?
SN74ABT16952DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16952DLR 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 SN74ABT16952DLR?
For technical support, including SN74ABT16952DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16952DLR requirements.
6.How does Aetrix verify that SN74ABT16952DLR is sourced from the original manufacturer or authorized distributors?
All SN74ABT16952DLR 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 SN74ABT16952DLR meets industry standards.
7.What is the process for return or replacement of SN74ABT16952DLR?
All SN74ABT16952DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16952DLR, 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 SN74ABT16952DLR part is unused and in its original packaging.
Return procedure for SN74ABT16952DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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