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Texas Instruments SN74ABT2952ADBR
- Part No.:
- SN74ABT2952ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT2952ADBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
SN74ABT2952ADBR from Texas Instruments is an octal bus transceiver and register with 3-state outputs, designed for bidirectional data flow between two 8-bit buses. It features dual back-to-back registers, noninverting outputs, 5-V supply operation, ±64-mA output drive, and operates from –40°C to 85°C. It is used in high-speed system bus isolation and data buffering applications.
For engineers reviewing the SN74ABT2952ADBR datasheet, SN74ABT2952ADBR pinout, SN74ABT2952ADBR application, or SN74ABT2952ADBR equivalent, key selection factors include clocked register functionality, 3-state control per direction, output drive strength, ground-bounce performance (VOLP < 1 V), and DB-package thermal impedance (104°C/W).
Technical Context
The SN74ABT2952ADBR implements two independent 8-bit register paths-A-to-B and B-to-A-each controlled by dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) inputs. Data latching occurs on the low-to-high clock transition when the corresponding clock-enable is low.
Its EPIC-IIB BiCMOS process enables TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), fast switching (fMAX = 150 MHz), and low power dissipation. Output enable logic ensures high-impedance state during power sequencing when OE is pulled up to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS systems |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded and computing applications |
| Output Drive | IOL = 64 mA / IOH = –32 mA - supports heavy capacitive loads and fanout to multiple TTL inputs |
| Propagation Delay | tPLH/tPHL ≤ 6.3 ns (max) at 5 V - enables reliable timing in sub-7-ns critical paths |
| Ground Bounce | VOLP < 1 V at VCC = 5 V - reduces noise coupling during simultaneous output switching |
| ESD Protection | 2000 V HBM, 200 V machine model - enhances robustness in handling and board assembly |
| Latch-Up Immunity | >500 mA per JESD 17 - prevents destructive latch-up under transient overvoltage conditions |
Pinout & Package
SN74ABT2952ADBR is packaged in a 24-pin Shrink Small-Outline (DB) package with 300-mil body width and gull-wing leads. The package has θJA = 104°C/W and is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-side data inputs/outputs | 8-bit bidirectional port connected to one system bus; driven or tristated based on OEAB/CLKENAB |
| B1–B8 | B-side data inputs/outputs | 8-bit bidirectional port connected to second system bus; independent A/B register control |
| CLKAB | A-to-B clock input | Triggers latching of A-port data into A→B register on rising edge when CLKENAB = L |
| CLKBA | B-to-A clock input | Triggers latching of B-port data into B→A register on rising edge when CLKENBA = L |
| CLKENAB | A-to-B clock enable | Active-low; disables CLKAB sampling when high, preventing unintended register updates |
| CLKENBA | B-to-A clock enable | Active-low; disables CLKBA sampling when high, enabling independent direction gating |
| OEAB | A-to-B output enable | Active-low; places A-port drivers in high-Z when high, isolating A bus from B bus |
| OEBA | B-to-A output enable | Active-low; places B-port drivers in high-Z when high, isolating B bus from A bus |
| VCC | Power supply | 5-V supply pin; requires local 0.1-µF ceramic decoupling adjacent to pin |
| GND | Ground reference | Signal and power return; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit registered transceivers | Enables synchronous, glitch-free bidirectional data transfer with independent clocking per direction |
| Noninverting outputs | Maintains signal polarity across both directions-critical for bus parity, address mirroring, and protocol integrity |
| State-of-the-art EPIC-IIB BiCMOS | Reduces dynamic power vs. standard bipolar while retaining TTL speed and drive capability |
| Low ground bounce (VOLP < 1 V) | Minimizes supply rail disturbance during parallel output switching-essential for mixed-signal system stability |
| Robust ESD and latch-up immunity | Meets MIL-STD-883 (2000 V HBM) and JESD 17 (>500 mA), supporting rugged industrial deployment |
Applications
| Backplane Bus Isolation | Memory Interface Buffering |
|---|---|
Use Scenario: Isolating CPU and peripheral buses in modular rack-mounted systems with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing data flow between processor and expansion slots using synchronized clock enables. Use Value: Prevents bus contention during insertion/removal and eliminates metastability via clocked register staging. | Use Scenario: Interfacing a microcontroller with external SRAM or Flash memory requiring separate address/data multiplexing control. IC Role / Device Role / Timing Role: Registered buffer providing setup/hold time margin and driving heavy capacitive loads on shared memory bus lines. Use Value: Enables reliable 150-MHz burst transfers by meeting tight tsu/th requirements and delivering ±64-mA drive. |
| Industrial PLC I/O Expansion | Digital Signal Processor (DSP) Data Bridge |
Use Scenario: Extending digital I/O channels between main controller and remote I/O modules over long PCB traces. IC Role / Device Role / Timing Role: Direction-controlled transceiver with independent OE and CLKEN signals for deterministic read/write handshaking. Use Value: Eliminates timing skew across 8-bit channels and maintains signal integrity over >10-cm trace lengths. | Use Scenario: Bridging a DSP's EMIF bus to an FPGA-based co-processor with asynchronous clock domains. IC Role / Device Role / Timing Role: Synchronous register stage absorbing clock domain crossing jitter and enabling handshake-free burst transfers. Use Value: Reduces FPGA logic overhead for synchronization and improves throughput by 25% vs. unregistered buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DBR | No internal registers; only 3-state transceiver (no clocked storage); lower drive (IOL = 64 mA same, but no CLK/CLKEN) | Suitable for simple level-shifting or bus isolation without timing control; cannot replace clocked data staging | Select when synchronous register function is unnecessary and cost or propagation delay is prioritized |
| SN74LVTH245DBR | 3.3-V only operation (1.65–3.6 V); LVCMOS input thresholds; lower drive (IOL = 32 mA); no ground-bounce spec | Designed for low-voltage mixed-signal systems; incompatible with 5-V buses without level translation | Select only in 3.3-V-only designs where power efficiency outweighs 5-V compatibility and noise immunity |
Compared with SN74ABT2952ADBR, SN74ABT245DBR omits clocked register functionality-making it unsuitable for applications requiring deterministic timing alignment-while SN74LVTH245DBR sacrifices 5-V tolerance and noise robustness for lower voltage operation, limiting use in legacy industrial or mixed-voltage environments.
Availability
SN74ABT2952ADBR is available at Aetrix Electronics and suitable for industrial control systems, embedded computing platforms, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT2952ADBR 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 SN74ABT2952ADBR belongs to TI's ABT-series advanced bi-directional transceivers, engineered for high-speed, noise-immune system bus interfacing in industrial and computing applications.
FAQ
What is the maximum clock frequency supported by the SN74ABT2952ADBR?
The SN74ABT2952ADBR supports a maximum clock frequency of 150 MHz across its full operating temperature range (–40°C to 85°C) and supply voltage (4.5 V to 5.5 V). This specification is verified under CL = 50 pF load conditions and reflects guaranteed timing performance for both A-to-B and B-to-A register paths in the SN74ABT2952ADBR device.
Does the SN74ABT2952ADBR require external pull-up resistors on its output-enable pins?
Yes, to ensure high-impedance state during power-up or power-down, OEAB and OEBA of the SN74ABT2952ADBR should each be tied to VCC through a pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source; TI recommends verifying against the specific driver's IOL rating to avoid violating the OE input voltage threshold.
Can the SN74ABT2952ADBR operate reliably at 4.5 V supply voltage?
Yes, the SN74ABT2952ADBR is fully characterized for operation from 4.5 V to 5.5 V. At VCC = 4.5 V, it maintains guaranteed IOL ≥ 48 mA, VOL ≤ 0.55 V, and tPLH/tPHL ≤ 6.3 ns (max), satisfying all recommended operating conditions specified in the official SN74ABT2952ADBR datasheet.
What is the thermal resistance (θJA) of the SN74ABT2952ADBR in its DB package?
For the SN74ABT2952ADBR in the 24-pin Shrink Small-Outline (DB) package, the junction-to-ambient thermal resistance θJA is 104°C/W under standard JEDEC test conditions. This value assumes a two-layer PCB with minimal copper pour; actual thermal performance may improve with enhanced layout practices such as internal ground/power planes and thermal vias.
Is the SN74ABT2952ADBR pin-compatible with the SN74ABT2952ADWR?
Yes, the SN74ABT2952ADBR and SN74ABT2952ADWR share identical pinouts, electrical specifications, and functional behavior-they differ only in packaging: DB (SSOP) vs. DW (SOIC). Both use 24-pin layouts with identical A1–A8, B1–B8, CLKAB, CLKBA, OEAB, OEBA, CLKENAB, CLKENBA, VCC, and GND assignments, enabling direct PCB footprint interchangeability.
SN74ABT2952ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- 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:
- 24-SSOP
SN74ABT2952ADBR FAQ
1.How can I place an order for SN74ABT2952ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2952ADBR 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 SN74ABT2952ADBR reliable?
The price and inventory of SN74ABT2952ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2952ADBR is usually 5 days.
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Once your SN74ABT2952ADBR 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 SN74ABT2952ADBR?
For technical support, including SN74ABT2952ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2952ADBR requirements.
6.How does Aetrix verify that SN74ABT2952ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2952ADBR 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 SN74ABT2952ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT2952ADBR?
All SN74ABT2952ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2952ADBR, 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 SN74ABT2952ADBR part is unused and in its original packaging.
Return procedure for SN74ABT2952ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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