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Texas Instruments SN74ABT652ADBR
- Part No.:
- SN74ABT652ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT652ADBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ABT652ADBR from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data bus management between two 8-bit buses (A and B). It integrates D-type flip-flops, dual clock inputs (CLKAB/CLKBA), select controls (SAB/SBA), and independent output enables (OEAB/OEBA), supporting real-time or stored-data transfer at up to 125 MHz. It operates from 4.5 V to 5.5 V over –40°C to 85°C and delivers high-drive capability (–32 mA IOH, 64 mA IOL) in a 24-pin SSOP (DB) package.
For engineers reviewing the SN74ABT652ADBR datasheet, SN74ABT652ADBR pinout, SN74ABT652ADBR application, or SN74ABT652ADBR equivalent, this device is selected for synchronous bus isolation, register-based data latching, and glitch-free multiplexed bus control in industrial control backplanes, test equipment interfaces, and legacy parallel data systems requiring TTL-compatible voltage levels and robust ESD protection (>2000 V HBM).
Technical Context
The SN74ABT652ADBR implements dual-path registered transceivers using EPIC-IIB BiCMOS technology to reduce power dissipation while maintaining TTL-level compatibility. Its architecture includes independent A→B and B→A data paths, each with dedicated clock, select, and enable logic - enabling simultaneous or staggered storage of data on either bus without decoding glitches.
Real-time transfer occurs when SAB or SBA is low; stored-data transfer activates when the respective select input is high. Clock-triggered storage (low-to-high CLKAB/CLKBA) captures data regardless of OE or S state, and output-enable sequencing ensures high-impedance during power-up via external pullup/pulldown resistors on OEBA and OEAB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL systems and tolerant of rail variation in industrial environments. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient conditions without derating. |
| Max Clock Frequency | 125 MHz - supports high-speed synchronous bus handshaking in real-time transfer mode. |
| Output Drive Strength | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 5.1 ns (CLK to B/A) - enables sub-8 ns cycle timing in register-to-bus transfers. |
| ESD Protection | >2000 V HBM - exceeds MIL-STD-883 Method 3015, reducing field failure risk in handling and assembly. |
| Input Clamp Current | –18 mA - limits damage from transient overvoltage on control or data lines. |
Pinout & Package
SN74ABT652ADBR uses a 24-pin Shrink Small-Outline Package (SSOP, DB), 0.300-inch body width, with 0.65 mm lead pitch and gull-wing leads. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKAB | Clock input for A→B register storage; rising edge latches A-bus data into internal D-flip-flops. |
| 2 | SAB | Select control for A→B path; low = real-time transfer, high = stored-data transfer from A register. |
| 3 | OEAB | Output enable for A→B direction; low = active drive, high = 3-state (high-Z) output. |
| 4–11 | A1–A8 | 8-bit data inputs/outputs on A bus; bidirectional I/O with internal register storage and 3-state control. |
| 12 | GND | Power ground reference for all internal circuitry and I/O drivers. |
| 13–20 | B1–B8 | 8-bit data inputs/outputs on B bus; functionally symmetric to A1–A8 with independent control. |
| 21 | OEBA | Output enable for B→A direction; low = active drive, high = 3-state (high-Z) output. |
| 22 | SBA | Select control for B→A path; low = real-time transfer, high = stored-data transfer from B register. |
| 23 | CLKBA | Clock input for B→A register storage; rising edge latches B-bus data into internal D-flip-flops. |
| 24 | VCC | Positive supply input (4.5–5.5 V); powers all logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select control | Eliminates multiplexer transition glitches during real-time ↔ stored-data mode switching via dedicated SAB/SBA logic. |
| Independent dual-clock architecture | Allows asynchronous or staggered storage of A and B bus data without interlock dependency. |
| High-drive 3-state outputs | –32 mA source / 64 mA sink capability ensures signal integrity across long traces or fan-out to ≥10 TTL loads. |
| Power-up high-impedance assurance | OEBA tied to VCC and OEAB tied to GND via external resistors guarantees defined 3-state at power-on reset. |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. standard bipolar TTL while retaining speed and noise immunity. |
Applications
| Industrial Backplane Interface | Automated Test Equipment (ATE) Bus Controller |
|---|---|
|
Use Scenario: Isolating and synchronizing data flow between CPU and peripheral modules on a 16-bit ISA-style backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing A-bus (CPU side) and B-bus (peripheral side), with clocked storage for handshake timing alignment. Use Value: Enables deterministic read/write cycles by decoupling CPU timing from slower peripherals via stored-data transfer, eliminating bus contention during arbitration. |
Use Scenario: Controlling parallel digital stimulus/response channels in modular ATE systems where pattern generators and digitizers share a common bus. IC Role / Device Role / Timing Role: Octal registered transceiver providing synchronized capture (via CLKBA) and replay (via SAB/OEAB) of test vectors with sub-10 ns timing precision. Use Value: Supports real-time pass/fail comparison by simultaneously storing incoming response data and retransmitting known stimulus patterns on the same bus cycle. |
| Legacy Printer/Scanner Parallel Interface | Programmable Logic Interface Bridge |
|
Use Scenario: Interfacing microcontroller-based printer controllers to Centronics-standard parallel ports with bidirectional data and status handshake signals. IC Role / Device Role / Timing Role: Registered transceiver buffering and latching STROBE, ACK, BUSY, and DATA lines with independent enable control per direction. Use Value: Resolves timing skew between MCU GPIO and parallel port spec requirements using internal registers, allowing software-controlled strobe synchronization. |
Use Scenario: Bridging FPGA I/O banks to external memory-mapped peripherals with mismatched timing domains or voltage thresholds. IC Role / Device Role / Timing Role: Level-shifting and registered bus interface between 3.3-V FPGA I/O and 5-V legacy peripherals, with clock-domain crossing via CLKAB/CLKBA. Use Value: Provides setup/hold time margin (tsu = 3 ns, th = 0 ns) and drive strength to meet 5-V TTL AC/DC specs without external level shifters or 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 | Octal non-inverting bus transceiver without internal registers; no clock or storage capability. | Used only for real-time bidirectional bus driving - lacks stored-data transfer, select control, or clocked latching. | Select SN74ABT245DBR only when synchronous data capture or glitch-free mode switching is unnecessary. |
| SN74LVTH16245ADGGR | 16-bit LVTTL transceiver with 3-state outputs; operates at 2.7–3.6 V, not 5 V; no internal registers or select logic. | Designed for low-voltage 3.3-V systems; incompatible with 5-V TTL signaling and missing register functionality. | Choose SN74LVTH16245ADGGR only for 3.3-V bus bridging where voltage translation and higher pin count are required. |
Compared with SN74ABT245DBR and SN74LVTH16245ADGGR, the SN74ABT652ADBR uniquely provides dual-clock register storage, real-time/stored-mode selection, and 5-V TTL compatibility - making it irreplaceable in applications requiring deterministic bus arbitration, data latching, or glitch-free multiplexing.
Availability
SN74ABT652ADBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automated test equipment (ATE) controllers, legacy parallel port adapters, and programmable logic interface bridges requiring stable component supply and long-term production continuity.
Supply support for SN74ABT652ADBR 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 TTL and advanced bus-interface ICs.
The SN74ABT652ADBR belongs to TI's ABT logic family, engineered for high-speed, low-power 5-V TTL-compatible bus management in industrial, test, and computing infrastructure applications.
FAQ
What is the maximum clock frequency supported by the SN74ABT652ADBR?
The SN74ABT652ADBR 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 high-throughput synchronous data capture in real-time or stored-transfer modes. The SN74ABT652ADBR maintains this rating across its full industrial temperature range (–40°C to +85°C) with appropriate layout and decoupling.
How does the SN74ABT652ADBR handle power-up sequencing to avoid bus contention?
The SN74ABT652ADBR requires OEBA to be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor to ensure outputs remain in high-impedance during power-up or power-down. This prevents unintended drive states that could cause bus contention. The minimum resistor values depend on the driver's current-sinking (B→A) and current-sourcing (A→B) capabilities, as defined in the datasheet. This behavior is intrinsic to the SN74ABT652ADBR's design and must be implemented externally.
Can the SN74ABT652ADBR operate with mixed voltage domains, such as 3.3-V inputs driving a 5-V bus?
No - the SN74ABT652ADBR is a 5-V-only device with VIH = 2 V and VIL = 0.8 V, designed for TTL-compatible signaling. While 3.3-V logic may meet the input threshold, it violates the recommended operating condition of VI = 0 to VCC and risks marginal noise immunity and timing compliance. The SN74ABT652ADBR does not include level-shifting circuitry; interfacing with 3.3-V systems requires external translators. This limitation is inherent to the SN74ABT652ADBR's BiCMOS architecture.
What is the purpose of the NC (no-connect) pins on the SN74ABT652ADBR DB package?
The SN74ABT652ADBR in the DB (SSOP-24) package has no NC pins - all 24 pins are assigned functional roles as defined in the pinout diagram (CLKAB, SAB, OEAB, A1–A8, GND, B1–B8, OEBA, SBA, CLKBA, VCC). Unlike larger packages (e.g., 28-pin DW or FK variants), the DB variant omits pins 12 and 24 from the full 28-pin layout but repurposes the remaining 24 positions without NCs. Confusion may arise from cross-package comparisons, but the SN74ABT652ADBR DB pin map contains zero NC terminals.
Does the SN74ABT652ADBR support hot-swap or live-insertion operation?
The SN74ABT652ADBR is not rated for hot-swap operation. Its absolute maximum ratings specify no current injection limits during partial power-up, and the absence of bus-hold or Ioff protection means unpowered VCC can result in latch-up or excessive current through input clamps. For hot-swap applications, TI recommends dedicated hot-swap controllers or devices with Ioff (power-off protection) and bus-hold features - neither of which is present in the SN74ABT652ADBR design.
SN74ABT652ADBR 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:
- 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-SSOP
SN74ABT652ADBR FAQ
1.How can I place an order for SN74ABT652ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT652ADBR 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 SN74ABT652ADBR reliable?
The price and inventory of SN74ABT652ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT652ADBR is usually 5 days.
3.What payment methods are accepted for SN74ABT652ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT652ADBR transactions.
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4.How is shipping managed for SN74ABT652ADBR?
SN74ABT652ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT652ADBR 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 SN74ABT652ADBR?
For technical support, including SN74ABT652ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT652ADBR requirements.
6.How does Aetrix verify that SN74ABT652ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT652ADBR 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 SN74ABT652ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT652ADBR?
All SN74ABT652ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT652ADBR, 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 SN74ABT652ADBR part is unused and in its original packaging.
Return procedure for SN74ABT652ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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