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Texas Instruments SN74ABT2952ADW
- Part No.:
- SN74ABT2952ADW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT2952ADW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,776
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Product details
Overview
SN74ABT2952ADW from Texas Instruments is an octal bus transceiver and register with 3-state outputs, implementing two independent 8-bit back-to-back registers for bidirectional data flow between A and B buses. It operates at 5 V supply, supports up to 150 MHz clock frequency, delivers ±64 mA output drive, and features noninverting outputs with low ground bounce (VOLP < 1 V). It is used in high-speed system bus isolation and data buffering in industrial control backplanes.
For engineers reviewing the SN74ABT2952ADW datasheet, SN74ABT2952ADW pinout, SN74ABT2952ADW application, or SN74ABT2952ADW equivalent, key selection criteria include 24-pin SOIC (DW) package compatibility, dual-clock-enable control (CLKENAB/CLKENBA), separate OEAB/OEBA 3-state enable logic, and guaranteed operation from –40°C to 85°C.
Technical Context
The SN74ABT2952ADW integrates two synchronized 8-bit latch-register stages per direction-A-to-B and B-to-A-with independent clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls. Each register captures data on the low-to-high clock transition when its respective clock-enable is low.
Its EPIC-IIB BiCMOS process enables fast propagation delays (tPLH/tPHL ≤ 6.3 ns at 5 V, CL = 50 pF), low static current (ICC ≤ 35 mA active, ≤ 250 µA disabled), and robust ESD protection (>2000 V HBM, >200 V MM). Output drivers support 3-state high-impedance hold 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 - Ensures stable operation across standard 5 V TTL-compatible systems with margin for rail variation. |
| Max Clock Frequency | 150 MHz - Supports high-throughput synchronous bus transfers without setup/hold violation. |
| Output Drive | IOL = 64 mA / IOH = –32 mA - Drives heavy capacitive loads (e.g., multi-drop buses) while maintaining VOL ≤ 0.55 V and VOH ≥ 2 V. |
| Propagation Delay | tPLH/tPHL ≤ 6.3 ns - Enables sub-7 ns edge-to-edge timing critical for 100+ MHz system clocks. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems including programmable logic controllers and test equipment. |
| Package | 24-pin SOIC (DW) - Standard surface-mount footprint compatible with automated assembly and IPC-7351B land patterns. |
| 3-State Enable Time | tPZL ≤ 6.7 ns - Allows rapid bus arbitration and dynamic port switching in multiprocessor interconnects. |
Pinout & Package
SN74ABT2952ADW uses a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), 7.5 mm wide, with 1.27 mm pitch and gull-wing leads. Thermal resistance θJA = 81°C/W enables reliable operation at full drive under natural convection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-bus data inputs/outputs | 8-bit bidirectional port connected to one system bus; driven by internal register when OEAB low and CLKAB active. |
| B1–B8 | B-bus data inputs/outputs | 8-bit bidirectional port connected to second system bus; driven by internal register when OEBA low and CLKBA active. |
| CLKAB | A-to-B clock input | Triggers latching of A-bus data into A→B register on rising edge when CLKENAB is low. |
| CLKBA | B-to-A clock input | Triggers latching of B-bus data into B→A register on rising edge when CLKENBA is low. |
| CLKENAB | A-to-B clock enable | Active-low control enabling CLKAB; when high, A→B register holds last captured value regardless of CLKAB edges. |
| CLKENBA | B-to-A clock enable | Active-low control enabling CLKBA; when high, B→A register holds last captured value regardless of CLKBA edges. |
| OEAB | A-to-B output enable | Active-low control enabling A→B port drivers; tied to VCC via pullup for safe high-Z at power-up. |
| OEBA | B-to-A output enable | Active-low control enabling B→A port drivers; tied to VCC via pullup for safe high-Z at power-up. |
| VCC | Power supply | +5 V supply for core logic and I/O; decoupling required within 10 mm of pin per high-speed design rules. |
| GND | Ground reference | Common return path for all signals and power; requires low-inductance connection to minimize ground bounce (VOLP < 1 V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit back-to-back registers | Enables simultaneous, independent bidirectional data capture and forwarding without external latch logic. |
| Noninverting outputs | Maintains signal polarity across both A↔B paths, simplifying timing analysis and eliminating inversion compensation. |
| Low ground bounce (VOLP < 1 V) | Reduces noise coupling into adjacent signals and improves signal integrity in dense PCB layouts. |
| Latch-up immunity >500 mA | Meets JESD17 requirements, ensuring robustness against transient overcurrent events in industrial environments. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power, achieving 150 MHz operation with ICC ≤ 35 mA active. |
Applications
| Industrial Backplane Interface | Programmable Logic Controller Bus Isolation |
|---|---|
Use Scenario: Isolating CPU and I/O module buses in modular PLC chassis to prevent fault propagation and enable hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional data register and buffer that synchronizes asynchronous module reads/writes using independent CLKAB/CLKBA domains. Use Value: Prevents bus contention during module insertion/removal and ensures deterministic timing via registered transfer at up to 150 MHz. | Use Scenario: Interfacing FPGA-based motion control cores with legacy 8-bit parallel I/O cards in CNC machine tool controllers. IC Role / Device Role / Timing Role: Octal transceiver providing level-shifted, registered data handoff between FPGA fabric and peripheral cards operating at different timing margins. Use Value: Eliminates need for discrete latches and glue logic while supporting 64 mA drive for long trace runs on industrial backplanes. |
| Test Equipment Data Acquisition Hub | High-Speed Diagnostic Bus Bridge |
Use Scenario: Aggregating sensor data from multiple analog front-end modules into a central ADC/DSP subsystem in automated test systems. IC Role / Device Role / Timing Role: Registered bus transceiver capturing parallel sensor samples on CLKAB and forwarding them on CLKBA to processing unit with precise phase alignment. Use Value: Reduces metastability risk in multi-clock domain crossings and provides deterministic sample latency (≤6.3 ns propagation). | Use Scenario: Bridging proprietary diagnostic bus (e.g., IEEE 1149.1 variant) to standard microcontroller debug interface in automotive ECUs. IC Role / Device Role / Timing Role: Dual-directional registered buffer isolating debug host from target bus, with independent OEAB/OEBA for protocol-aware direction control. Use Value: Enables safe, glitch-free bus turnaround during bidirectional JTAG/SWD sequences without external direction logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | No internal registers; unidirectional or configurable direction control only; lacks CLKAB/CLKBA/CLKENAB/CLKENBA logic. | Suitable for simple bus driving but cannot replace registered data capture or dual-clock synchronization. | Select SN74ABT245DW only if application requires basic 3-state buffering without clocked registration. |
| SN74LVTH245ADW | Lower voltage (3.3 V) operation; LVT logic family; no internal registers; 24 mA drive; not 5 V tolerant on inputs. | Designed for 3.3 V systems; incompatible with 5 V bus signaling unless level-shifted; no clocked storage capability. | Choose SN74LVTH245ADW only for 3.3 V-only designs where registration is unnecessary and voltage scaling is mandatory. |
Compared with SN74ABT245DW and SN74LVTH245ADW, the SN74ABT2952ADW uniquely provides dual 8-bit registered bidirectional data paths with independent clocking and enable controls-making it irreplaceable in applications requiring synchronous, glitch-free bus handoff across timing domains.
Availability
SN74ABT2952ADW is available at Aetrix Electronics and suitable for industrial automation backplanes, programmable logic controller interfaces, and high-speed test equipment data acquisition requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74ABT2952ADW 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ABT2952ADW belongs to TI's ABT logic family, designed specifically for high-speed, registered bus interfacing in industrial control and instrumentation systems requiring robust 5 V operation and precise timing control.
FAQ
What is the maximum clock frequency supported by the SN74ABT2952ADW?
The SN74ABT2952ADW supports a maximum clock frequency of 150 MHz across its recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to 85°C). This rating is verified by timing parameters including tw (minimum pulse width) of 3.3 ns and fclock max = 150 MHz in the official datasheet SCBS203D. The SN74ABT2952ADW achieves this performance using EPIC-IIB BiCMOS technology, enabling reliable synchronous data transfer in high-speed backplane applications.
How does the SN74ABT2952ADW handle power-up and power-down sequencing?
The SN74ABT2952ADW ensures high-impedance outputs during power-up or power-down by requiring OEAB and OEBA to be tied to VCC through pullup resistors. The minimum resistor value depends on the driver's current-sinking capability, as specified in the datasheet. This prevents bus contention and undefined states before logic stabilization. The SN74ABT2952ADW does not include internal power-on reset circuitry, so external biasing of OE pins is mandatory for safe system integration.
Does the SN74ABT2952ADW support mixed-voltage operation between A and B buses?
No, the SN74ABT2952ADW does not support mixed-voltage operation. It is a 5 V-only device with VCC rated from 4.5 V to 5.5 V. Both A and B ports operate at the same VCC-supplied logic level and are not 5 V tolerant when powered down or at lower voltages. Inputs must remain within 0 V to VCC, and outputs swing rail-to-rail relative to the single VCC supply. The SN74ABT2952ADW is not compatible with 3.3 V or 2.5 V bus domains without external level-shifting circuitry.
What is the thermal resistance (θJA) of the SN74ABT2952ADW in its DW package?
The SN74ABT2952ADW in the 24-pin SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 81°C/W, as specified in the Absolute Maximum Ratings table of the SCBS203D datasheet. This value assumes standard JEDEC test conditions (single-layer board, 1 in² copper pad). Actual thermal performance in end equipment depends on PCB layout, copper area, airflow, and power dissipation-measured peak ICC is 35 mA active, yielding ~175 mW typical power at 5 V.
Can the SN74ABT2952ADW be used as a simple 8-bit buffer without clocking?
Yes, the SN74ABT2952ADW can function as an 8-bit 3-state buffer without clocking by holding CLKENAB and CLKENBA high (inactive), then toggling OEAB or OEBA low to enable A→B or B→A data pass-through. In this mode, data appears transparently at outputs with propagation delay (tPLH/tPHL ≤ 6.3 ns), but no registration occurs-the SN74ABT2952ADW retains its registered architecture and does not become combinational. For true unregistered buffering, SN74ABT245DW is more appropriate.
SN74ABT2952ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-SOIC
SN74ABT2952ADW FAQ
1.How can I place an order for SN74ABT2952ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2952ADW 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 SN74ABT2952ADW reliable?
The price and inventory of SN74ABT2952ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2952ADW is usually 5 days.
3.What payment methods are accepted for SN74ABT2952ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT2952ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT2952ADW?
SN74ABT2952ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2952ADW 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 SN74ABT2952ADW?
For technical support, including SN74ABT2952ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2952ADW requirements.
6.How does Aetrix verify that SN74ABT2952ADW is sourced from the original manufacturer or authorized distributors?
All SN74ABT2952ADW 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 SN74ABT2952ADW meets industry standards.
7.What is the process for return or replacement of SN74ABT2952ADW?
All SN74ABT2952ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2952ADW, 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 SN74ABT2952ADW part is unused and in its original packaging.
Return procedure for SN74ABT2952ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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