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Texas Instruments SN74ABT652ADWR
- Part No.:
- SN74ABT652ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT652ADWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,409
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Product details
Overview
SN74ABT652ADWR from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data bus isolation and storage in high-speed digital systems. It features dual 8-bit buses (A and B), independent clock inputs (CLKAB/CLKBA), select controls (SAB/SBA), and output enables (OEAB/OEBA), delivering ±32-mA high-drive outputs and supporting up to 125-MHz clock frequency at VCC = 5 V. It operates across –40°C to 85°C and is used in industrial backplane interfaces and memory-mapped I/O expansion.
For engineers reviewing the SN74ABT652ADWR datasheet, SN74ABT652ADWR pinout, SN74ABT652ADWR application, or SN74ABT652ADWR equivalent, key selection considerations include real-time vs. registered data transfer modes, simultaneous A/B bus storage capability, 3-state output timing (tPZH/tPLZ < 6.1 ns), BiCMOS power efficiency, and SOIC-24 package compatibility with legacy 5-V TTL systems.
Technical Context
The SN74ABT652ADWR implements two independent 8-bit D-type flip-flop registers-one per bus-enabling synchronized capture of A- or B-bus data on low-to-high clock transitions. Its select-control logic eliminates multiplexer glitches during mode switching between real-time and stored data paths.
It supports four fundamental bus-management functions: real-time A→B and B→A transfer, simultaneous A/B data storage, and cross-bus transfer of stored data. Output-enable polarity is active-low for both OEAB (A→B) and OEBA (B→A), with recommended pullup/pulldown resistors for controlled power-up/down states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL logic rails and noise margin compliance. |
| Max Clock Frequency | 125 MHz - enables high-throughput synchronous data transfer in fast control and interface applications. |
| Output Drive | –32 mA IOH / +64 mA IOL - provides robust fanout capability driving multiple TTL loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 5.6 ns (CLK→B/A) - guarantees sub-6-ns timing for critical setup/hold windows in 100+ MHz designs. |
| 3-State Enable Time | tPZH ≤ 6.1 ns (OEAB→B) - ensures rapid bus release to prevent contention during dynamic bus arbitration. |
| Operating Temperature | –40°C to +85°C - qualifies for industrial-grade embedded systems including programmable logic controllers and motor drives. |
| ESD Protection | >2000 V HBM - meets MIL-STD-883 Class 3015 requirements for handling robustness in manufacturing and field service. |
Pinout & Package
SN74ABT652ADWR uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27-mm pitch, and JEDEC MS-013 compliant footprint. Pin 1 is located at top-left corner (Q1 quadrant) in tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | CLKAB, SAB | Active-high clock and select for A→B data path; SAB = L enables real-time A→B transfer. |
| 3, 23 | OEAB, OEBA | Active-low enables: OEAB = L activates A→B outputs; OEBA = L activates B→A outputs. |
| 4–11 | A1–A8 | 8-bit input/output port A - bidirectional with 3-state control; connects to local processor or peripheral bus. |
| 13–20 | B1–B8 | 8-bit input/output port B - bidirectional with 3-state control; interfaces to remote subsystem or memory bus. |
| 12, 21 | GND, VCC | Power supply pins - require local 0.1-µF ceramic decoupling adjacent to pin 12 (GND) and pin 21 (VCC). |
| 22, 24 | CLKBA, SBA | Active-high clock and select for B→A data path; SBA = L enables real-time B→A transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select control | Eliminates transient bus contention during SAB/SBA transitions between real-time and stored data modes. |
| Simultaneous dual-bus storage | Allows CLKAB↑ and CLKBA↑ on same edge to latch A1–A8 and B1–B8 into respective registers atomically. |
| High-drive 3-state outputs | –32 mA IOH / +64 mA IOL supports direct drive of 10+ TTL inputs or termination-matched transmission lines. |
| Power-up/down isolation | Pullup on OEBA and pulldown on OEAB ensure high-impedance state before VCC stabilizes, preventing bus conflicts. |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. bipolar-only equivalents while retaining TTL-compatible voltage thresholds and speed. |
Applications
| Industrial Backplane Interface | Memory-Mapped I/O Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in PLC chassis using shared backplane wiring. IC Role / Device Role / Timing Role: SN74ABT652ADWR acts as registered bus transceiver, latching CPU writes into local card registers and forwarding card responses to CPU on demand. Use Value: Enables deterministic timing via clock-synchronized transfers and prevents bus contention during hot-swap events using 3-state control. | Use Scenario: Extending microcontroller GPIO count by connecting parallel peripherals (ADCs, DACs, LCD drivers) via dedicated I/O bus. IC Role / Device Role / Timing Role: SN74ABT652ADWR serves as bidirectional data buffer with register hold capability, allowing CPU to read/write peripheral registers without continuous bus occupation. Use Value: Reduces software overhead by storing peripheral status in internal flip-flops and enabling burst reads/writes at full system clock rate. |
| Legacy System Bus Bridge | Dual-Processor Interconnect |
Use Scenario: Interfacing modern FPGA-based controller to legacy 5-V TTL ISA or VMEbus peripherals requiring strict timing compliance. IC Role / Device Role / Timing Role: SN74ABT652ADWR provides level- and timing-compatible bridging with real-time pass-through and registered handshake modes. Use Value: Maintains sub-6-ns propagation delay and 125-MHz clock support required for ISA timing budgets while adding storage for protocol handshaking. | Use Scenario: Synchronizing data exchange between two independent microcontrollers sharing memory-mapped communication registers. IC Role / Device Role / Timing Role: SN74ABT652ADWR functions as dual-port register file, allowing each MCU to write to its own bus and read from the other's stored data. Use Value: Eliminates need for external arbitration logic by enabling atomic store-and-forward operations with glitch-free select control. |
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 | Non-registered, no internal storage; only real-time bidirectional transfer; lower drive (–24 mA/+48 mA). | Suitable for simple bus buffering but lacks clocked data capture needed for handshake protocols. | Select when timing-critical storage is unnecessary and cost/power reduction is prioritized over register functionality. |
| SN74LVTH16245DGGR | 16-bit, LVTH family; 3.3-V operation only; higher speed (tPD ≤ 3.9 ns); no 5-V tolerance. | Requires level-shifting for 5-V systems; optimized for low-voltage, high-density PCB layouts. | Choose for new 3.3-V designs where pin count and speed outweigh backward compatibility with 5-V infrastructure. |
Compared with SN74ABT245DW and SN74LVTH16245DGGR, the SN74ABT652ADWR uniquely combines 5-V TTL compatibility, integrated dual-register storage, and glitch-free select control-making it irreplaceable in legacy-synchronized, multi-cycle handshake interfaces where data integrity across clock domains is essential.
Availability
SN74ABT652ADWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory-mapped I/O expansion, and legacy system bus bridge applications requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT652ADWR 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 logic families.
The SN74ABT652ADWR belongs to the ABT-series advanced bi-directional transceivers, engineered for high-speed, low-noise 5-V TTL system interfacing with emphasis on bus integrity, ESD resilience, and industrial temperature operation.
FAQ
What is the maximum clock frequency supported by the SN74ABT652ADWR?
The SN74ABT652ADWR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C), as specified in the timing requirements table. This applies to both CLKAB and CLKBA inputs and enables reliable synchronous data capture in high-speed industrial control and interface applications. The SN74ABT652ADWR maintains this rating across its full industrial temperature range (–40°C to +85°C) with appropriate derating per TI's characterization data.
How does the SN74ABT652ADWR handle power-up sequencing to avoid bus contention?
To prevent bus contention during power-up or power-down, the SN74ABT652ADWR requires OEBA to be tied to VCC via a pullup resistor and OEAB to be tied to GND via a pulldown resistor. The minimum resistor values depend on driver current capability: OEBA pullup must accommodate B→A sink current, and OEAB pulldown must support A→B source current. This ensures both output ports remain in high-impedance state until control signals stabilize, protecting connected bus lines. The SN74ABT652ADWR datasheet specifies these resistor sizing guidelines explicitly.
Can the SN74ABT652ADWR operate with mixed-mode voltage levels, such as 3.3-V inputs driving a 5-V supply?
No-the SN74ABT652ADWR is a 5-V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) but no guaranteed 3.3-V input tolerance. While 3.3-V logic high may exceed VIH in many cases, TI does not characterize or guarantee operation with 3.3-V inputs under all conditions, especially across temperature and voltage tolerances. For mixed-voltage systems, level-shifting circuitry or a 3.3-V-compatible alternative like SN74LVTH16245 should be used instead of relying on marginal operation of the SN74ABT652ADWR.
What is the purpose of the NC (no-connect) pins on the SN74ABT652ADWR SOIC-24 package?
The SN74ABT652ADWR SOIC-24 package has no NC pins-every pin is assigned a defined function per the official TI pinout diagram. Confusion may arise from the DW package drawing showing pin 12 as GND and pin 21 as VCC, with no unassigned terminals. All 24 pins serve active roles: 16 I/O (A1–A8, B1–B8), 4 control (OEAB, OEBA, SAB, SBA), 2 clocks (CLKAB, CLKBA), and 2 power (GND, VCC). The SN74ABT652ADWR does not contain internal NC connections; unused pins do not exist in this variant.
Does the SN74ABT652ADWR support simultaneous storage of data on both A and B buses?
Yes-the SN74ABT652ADWR supports simultaneous storage of data on both A and B buses via concurrent low-to-high transitions on CLKAB and CLKBA. When both clocks rise simultaneously, A1–A8 and B1–B8 are latched into their respective internal D-type flip-flops in one cycle. This atomic dual-bus capture is confirmed in the FUNCTION TABLE (row 2: "Store A and B data") and enables coherent snapshotting of bidirectional traffic, which is essential for debugging, protocol analysis, and synchronized peripheral interfacing using the SN74ABT652ADWR.
SN74ABT652ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN74ABT652ADWR FAQ
1.How can I place an order for SN74ABT652ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT652ADWR 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 SN74ABT652ADWR reliable?
The price and inventory of SN74ABT652ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT652ADWR is usually 5 days.
3.What payment methods are accepted for SN74ABT652ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT652ADWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT652ADWR?
SN74ABT652ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT652ADWR 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 SN74ABT652ADWR?
For technical support, including SN74ABT652ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT652ADWR requirements.
6.How does Aetrix verify that SN74ABT652ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT652ADWR 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 SN74ABT652ADWR meets industry standards.
7.What is the process for return or replacement of SN74ABT652ADWR?
All SN74ABT652ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT652ADWR, 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 SN74ABT652ADWR part is unused and in its original packaging.
Return procedure for SN74ABT652ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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