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Texas Instruments SN74ABT2952ANT
- Part No.:
- SN74ABT2952ANT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT2952ANT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
SN74ABT2952ANT from Texas Instruments is an octal bus transceiver and register IC 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 industrial control backplanes and legacy system bus interfacing where registered data staging and bus isolation are required.
For engineers reviewing the SN74ABT2952ANT datasheet, SN74ABT2952ANT pinout, SN74ABT2952ANT application, or SN74ABT2952ANT equivalent, key selection considerations include its dual-clock-register architecture, 3-state enable timing (tPZH/tPLZ ≤ 5.7 ns), latch-up immunity (>500 mA), and compatibility with TTL-level control inputs in 24-pin plastic DIP packaging.
Technical Context
The SN74ABT2952ANT 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) signals. Data latching occurs on the low-to-high transition of the respective clock when its clock-enable is low.
Its BiCMOS EPIC-II™ design enables high-speed operation (fclock up to 150 MHz) while maintaining low ground bounce (VOLP < 1 V at VCC = 5 V) and robust ESD protection (>2000 V HBM). All I/O ports tolerate 5.5-V outputs and support hot-insertion-safe 3-state control.
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 CMOS logic rails. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments. |
| Output Drive | IOL = 64 mA / IOH = –32 mA - supports direct driving of multiple TTL loads without buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.3 ns - enables reliable 150-MHz clocked data transfer between buses. |
| Enable/Disable Time | tPZH/tPLZ ≤ 5.7 ns - guarantees fast bus turnaround and minimal contention windows. |
| Input Clamp Current | IIK = –18 mA - protects against negative transients during hot-swap or fault conditions. |
| Latch-Up Immunity | >500 mA per JESD 17 - prevents destructive latch-up under overvoltage or ESD stress. |
Pinout & Package
SN74ABT2952ANT is supplied in a 24-pin plastic dual-in-line package (PDIP-NT), with 0.600-inch body width and through-hole mounting. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | 8-bit bidirectional data bus interface; driven high-impedance when OEAB = high. |
| B1–B8 | Input/Output port B | 8-bit bidirectional data bus interface; driven high-impedance when OEBA = high. |
| OEAB | Output enable (A-to-B) | Active-low control enabling A-port data onto B bus; must be pulled up for power-up high-Z safety. |
| OEBA | Output enable (B-to-A) | Active-low control enabling B-port data onto A bus; independent of OEAB for full bidirectional control. |
| CLKAB | Register clock (A-to-B) | Low-to-high edge captures A-port data into A-to-B register when CLKENAB = low. |
| CLKBA | Register clock (B-to-A) | Low-to-high edge captures B-port data into B-to-A register when CLKENBA = low. |
| CLKENAB | Register enable (A-to-B) | Active-low gate for CLKAB; disables latching when high, preserving register state. |
| CLKENBA | Register enable (B-to-A) | Active-low gate for CLKBA; disables latching when high, preserving register state. |
| VCC | Power supply | +5 V supply pin; decoupling capacitor required near pin for noise suppression. |
| GND | Ground reference | Signal and power return; requires 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. |
| BiCMOS EPIC-II™ process | Reduces dynamic power vs. pure bipolar while retaining TTL-compatible speed and drive strength. |
| Noninverting outputs | Preserves signal polarity across both A↔B paths - simplifies timing analysis and eliminates inversion logic. |
| High-impedance on power-up | OE pins default to high-Z when tied to VCC via pullup; prevents bus contention during boot. |
| TTL-compatible input thresholds | VIL = 0.8 V / VIH = 2.0 V - ensures interoperability with legacy 5-V logic families without level shifters. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a microcontroller bus to a distributed I/O module across a long PCB backplane with noise and skew. IC Role / Device Role / Timing Role: Registered transceiver buffering and synchronizing data transfers between CPU and remote peripherals using separate A/B clocks. Use Value: Eliminates metastability risk via clocked registration and provides 64-mA drive to overcome trace capacitance and maintain signal integrity. | Use Scenario: Extending a 1980s-era 8-bit ISA-like bus to add new function cards while preserving timing margins. IC Role / Device Role / Timing Role: Bidirectional bus repeater with independent A→B and B→A register control, supporting split-phase bus cycles. Use Value: Enables deterministic setup/hold timing (tsu = 2.5 ns, th = 1.5 ns) and eliminates contention via precise 3-state enable sequencing. |
| Test Equipment Data Capture | Programmable Logic Interposer |
Use Scenario: Capturing parallel digital waveforms from DUTs in automated test systems with variable clock domains. IC Role / Device Role / Timing Role: Synchronizing asynchronous DUT data into a system clock domain using CLKAB/CLKBA edges. Use Value: Dual-register architecture allows simultaneous capture and readout - one register sampling while the other is being read. | Use Scenario: Isolating and retiming signals between FPGA I/O banks and external memory or peripheral ASICs. IC Role / Device Role / Timing Role: Registered level-shifter and bus driver between FPGA core logic and off-chip 5-V devices. Use Value: Provides 3-state isolation during FPGA configuration and supports hot-swap-safe 5.5-V tolerant I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | No internal registers; unidirectional or configurable direction control only; lacks dual-clock latching. | Suitable for simple bus buffering but cannot replace registered data staging or dual-clock synchronization. | Select SN74ABT245N only if clocked registration is unnecessary and lower pin count (20-pin) is preferred. |
| SN74LVTH245PW | 3.3-V supply only; LVTH logic family; lower drive (±24 mA); no military temp range. | Designed for modern low-voltage systems; incompatible with 5-V buses without level translation. | Choose SN74LVTH245PW for 3.3-V embedded designs requiring lower power and smaller TSSOP-20 package. |
Compared with SN74ABT245N and SN74LVTH245PW, the SN74ABT2952ANT uniquely delivers dual 8-bit registered bidirectional paths with 5-V tolerance, making it irreplaceable in legacy 5-V synchronous bus architectures requiring deterministic data staging.
Availability
SN74ABT2952ANT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, test equipment data capture, and programmable logic interposers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT2952ANT 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 industry-standard logic families.
The SN74ABT2952ANT belongs to TI's ABT-series advanced bi-directional transceivers, engineered for high-speed, registered 5-V bus interfacing in industrial and instrumentation systems requiring robustness and timing precision.
FAQ
What is the maximum clock frequency supported by the SN74ABT2952ANT?
The SN74ABT2952ANT supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This is confirmed by timing specifications including tw (minimum pulse width) of 3.3 ns and fclock max = 150 MHz in the datasheet. At temperature extremes or reduced supply voltage, derating applies - e.g., operation at 85°C may require limiting to ≤120 MHz for margin.
Does the SN74ABT2952ANT support hot-swap or live insertion?
Yes, the SN74ABT2952ANT supports hot-swap operation due to its 5.5-V tolerant I/O structure, high-impedance power-up state (when OE is pulled up), and robust ESD protection (>2000 V HBM). Its output clamp current rating (–50 mA) and latch-up immunity (>500 mA) further ensure resilience during live insertion into powered backplanes - provided OEAB and OEBA are properly biased before VCC ramp-up.
How does the SN74ABT2952ANT handle bus contention during direction switching?
The SN74ABT2952ANT avoids bus contention through independent, active-low output-enable controls (OEAB and OEBA). Contention is prevented by ensuring only one OE is low at any time - for example, asserting OEAB low while OEBA remains high isolates the B bus from A-side drivers. The device's fast disable time (tPLZ/tPZH ≤ 5.7 ns) minimizes overlap windows, and its high-impedance state is guaranteed even during power transitions when OE is pulled to VCC.
Can the SN74ABT2952ANT operate with mixed-voltage buses (e.g., 3.3-V logic driving its inputs)?
Yes - the SN74ABT2952ANT accepts 3.3-V logic inputs reliably because its VIH (2.0 V min) and VIL (0.8 V max) thresholds are compatible with 3.3-V CMOS/TTL logic levels. However, its outputs swing to 5-V levels, so interfacing to 3.3-V receivers requires external level translation or series termination to avoid overvoltage damage. The device itself does not provide internal level shifting.
What is the thermal performance of the SN74ABT2952ANT in the NT (PDIP) package?
In the NT (plastic DIP-24) package, the SN74ABT2952ANT has a junction-to-ambient thermal resistance (θJA) of 67°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC test board conditions (single-layer copper, 1 in² pad). For continuous operation at full drive (e.g., 64 mA per output), junction temperature rise is ~4.3°C per output active - allowing safe operation up to 85°C ambient with appropriate board layout and airflow.
SN74ABT2952ANT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABT2952ANT FAQ
1.How can I place an order for SN74ABT2952ANT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2952ANT 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 SN74ABT2952ANT reliable?
The price and inventory of SN74ABT2952ANT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2952ANT is usually 5 days.
3.What payment methods are accepted for SN74ABT2952ANT?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT2952ANT?
SN74ABT2952ANT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2952ANT 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 SN74ABT2952ANT?
For technical support, including SN74ABT2952ANT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2952ANT requirements.
6.How does Aetrix verify that SN74ABT2952ANT is sourced from the original manufacturer or authorized distributors?
All SN74ABT2952ANT 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 SN74ABT2952ANT meets industry standards.
7.What is the process for return or replacement of SN74ABT2952ANT?
All SN74ABT2952ANT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2952ANT, 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 SN74ABT2952ANT part is unused and in its original packaging.
Return procedure for SN74ABT2952ANT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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