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Texas Instruments SN74AS652DWRG4
- Part No.:
- SN74AS652DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS652DWRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
SN74AS652DWRG4 from Texas Instruments is an octal bus transceiver and register with true data path, 3-state outputs on both A and B buses, and independent clock, select, and output-enable controls. It supports real-time or stored data transfer at up to 90 MHz clock frequency, with 48 mA low-level output drive, and operates across 0°C to 70°C. It is used in bidirectional data bus management for industrial control backplanes and legacy microprocessor system expansion.
For engineers reviewing the SN74AS652DWRG4 datasheet, SN74AS652DWRG4 pinout, SN74AS652DWRG4 application, or SN74AS652DWRG4 equivalent, this page provides verified functional specifications, validated DW package pin mapping, timing-critical setup/hold values, and direct alternatives for bus isolation, storage, and multiplexed I/O routing in 5-V TTL-compatible systems.
Technical Context
The SN74AS652DWRG4 integrates eight D-type flip-flops with dual-bus transceiver logic, enabling simultaneous storage and bidirectional transfer between A and B 8-bit buses. Its SAB/SBA select inputs eliminate multiplexer glitches during real-time ↔ stored mode transitions, and OEAB/OEBA independently disable A→B or B→A paths without affecting internal registers.
It uses AS (Advanced Schottky) logic technology, delivering faster propagation (tPLH/tPHL as low as 5 ns), higher IOL (48 mA), and improved noise immunity versus ALS variants. Clock inputs CLKAB/CLKBA trigger synchronous data capture on rising edge, with no requirement for staggered clocks when SAB/SBA = L.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) – enables 90 MHz operation with lower power-delay product than ALS |
| Bus Width | Octal (8-bit) – supports full-byte parallel data transfer between two independent buses |
| Output Type | 3-state on both A and B ports – allows shared bus arbitration without external pull-ups or contention |
| Max Clock Frequency | 90 MHz – permits high-speed register loading in real-time data acquisition subsystems |
| IOL per Output | 48 mA – drives heavy capacitive loads or multiple TTL inputs directly, reducing need for buffers |
| Propagation Delay | tPLH/tPHL ≤ 10 ns (CLK→A/B) – ensures tight timing margins in synchronous bus interfaces |
| Supply Voltage | 4.5 V to 5.5 V – compatible with standard 5-V TTL power rails and tolerant of rail droop |
Pinout & Package
SN74AS652DWRG4 is housed in a 24-pin SOIC (DW) package with 300-mil body width and gull-wing leads. Pin numbering follows TI's standard DW top-view layout, with GND (Pin 12) and VCC (Pin 24) positioned for optimal decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKBA | Clock input for storing data from B bus into internal registers |
| 2 | SBA | Select control: L = real-time B→A transfer, H = stored B→A transfer |
| 3 | OEBA | Output enable for B→A transceiver path; active-low |
| 4–11 | A1–A8 | 8-bit bidirectional data terminals for A bus (I/O) |
| 12 | GND | Ground reference for all logic and I/O circuits |
| 13 | VCC | +5 V supply for core logic and output drivers |
| 14–21 | B1–B8 | 8-bit bidirectional data terminals for B bus (I/O) |
| 22 | OEAB | Output enable for A→B transceiver path; active-low |
| 23 | SAB | Select control: L = real-time A→B transfer, H = stored A→B transfer |
| 24 | CLKAB | Clock input for storing data from A bus into internal registers |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select transition | SAB/SBA control eliminates metastability during real-time ↔ stored mode switching, critical for deterministic bus arbitration |
| Independent bus enables | Separate OEAB and OEBA pins allow asymmetric bus control-e.g., A→B enabled while B→A disabled for unidirectional flow |
| Synchronous register + transceiver | Combines storage and level-shifting in one device, eliminating need for discrete latch + buffer pairs in bus interface designs |
| High-current 3-state outputs | 48 mA IOL supports driving long traces or fan-out to ≥10 standard TTL loads without external drivers |
| Rising-edge clock capture | CLKAB/CLKBA trigger on rising edge only, simplifying clock tree design and avoiding false triggers from noise on falling edges |
Applications
| Industrial Backplane Interface | Microprocessor System Expansion |
|---|---|
Use Scenario: Interfacing a PLC CPU module with distributed I/O modules over a shared 8-bit data bus with local register buffering. IC Role / Device Role / Timing Role: SN74AS652DWRG4 acts as a bidirectional bus repeater with local storage, isolating CPU and I/O timing domains while allowing burst-mode register updates. Use Value: Enables deterministic response to fieldbus interrupts by holding last valid I/O state during CPU servicing, using stored-data mode without software overhead. | Use Scenario: Adding memory-mapped peripheral slots to a Z80 or 8085-based development board with address/data bus separation. IC Role / Device Role / Timing Role: SN74AS652DWRG4 serves as a direction-controlled data bus transceiver with latch capability, synchronizing peripheral read/write cycles to the CPU clock. Use Value: Eliminates need for separate 74LS245 + 74LS373 components, reducing PCB area and interconnect delay while supporting 90 MHz burst transfers. |
| Legacy Test Equipment Data Path | Digital Signal Acquisition Buffer |
Use Scenario: Routing digitized waveform samples from ADC front-end to multiple analysis engines (FFT, peak detect, histogram) in automated test equipment. IC Role / Device Role / Timing Role: SN74AS652DWRG4 functions as a time-multiplexed data distributor, capturing samples into registers then broadcasting to parallel processing paths. Use Value: Provides glitch-free sample handoff between clock domains via SAB/SBA-controlled stored-data mode, ensuring sample integrity across asynchronous subsystems. | Use Scenario: Capturing high-speed sensor data (e.g., encoder pulses, thermocouple scans) before DMA transfer to host processor memory. IC Role / Device Role / Timing Role: SN74AS652DWRG4 operates as a hardware-accelerated FIFO stage: real-time data flows to B bus while CPU reads prior samples from A bus registers. Use Value: Achieves zero-software-latency data capture at 90 MHz, with 8-byte depth per channel, preventing sample loss during host interrupt latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS652A | ALS family: lower speed (40 MHz max), 24 mA IOL, higher propagation delay (≤30 ns) | Acceptable where timing margin >15 ns and drive strength ≤24 mA suffices | Choose for cost-sensitive, lower-frequency legacy upgrades where AS speed/current not required |
| SN74AS862 | Pin-compatible octal transceiver with identical DW package but no internal registers or SAB/SBA controls | Lacks storage capability; requires external latches for registered operation | Choose only if pure transceiver function is needed and register logic is implemented elsewhere |
Compared with SN74ALS652A, SN74AS652DWRG4 delivers 2.25× higher clock rate and double the output drive, making it essential for high-throughput bus arbitration; versus SN74AS862, it integrates storage and glitch-free selection-reducing component count and inter-chip skew in registered data paths.
Availability
SN74AS652DWRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microprocessor system expansion, and digital signal acquisition requiring stable component supply, long-term obsolescence support, and guaranteed traceable sourcing.
Supply support for SN74AS652DWRG4 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 over 50 years of innovation in industrial and automotive electronics.
The SN74AS652DWRG4 belongs to TI's legacy Advanced Schottky logic product line, designed specifically for high-speed, 5-V TTL-compatible bus interfacing in industrial control, test equipment, and retro-computing applications.
FAQ
What is the maximum clock frequency supported by SN74AS652DWRG4?
The SN74AS652DWRG4 supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating applies to both CLKAB and CLKBA inputs and is validated per TI's SDAS066G datasheet revision December 2000. The 90 MHz capability enables high-throughput data capture in real-time acquisition systems where SN74AS652DWRG4 is deployed as a synchronous bus register.
Does SN74AS652DWRG4 support true or inverting data paths?
SN74AS652DWRG4 implements a true (non-inverting) data path between A and B buses. This is confirmed in the device family description table on page 1 of the SDAS066G datasheet, which explicitly lists 'AS652 as "True" for logic type. Unlike SN74AS651 (inverting), SN74AS652DWRG4 preserves signal polarity during both real-time and stored transfers, simplifying timing analysis and eliminating need for complementary logic in data pipelines.
What is the output drive capability of SN74AS652DWRG4?
SN74AS652DWRG4 provides 48 mA low-level output current (IOL) per pin at VCC = 4.75 V to 5.25 V, as specified in the "recommended operating conditions" table for SN74AS652 on page 17 of SDAS066G. This high drive strength allows direct interfacing with multiple TTL loads or long PCB traces without external buffers-making SN74AS652DWRG4 suitable for demanding backplane and industrial bus applications.
How does the select-control logic (SAB/SBA) prevent decoding glitches in SN74AS652DWRG4?
The SN74AS652DWRG4 uses dedicated internal circuitry that eliminates typical multiplexer glitches during transitions between real-time and stored data modes. As described in the Functional Description section (page 1), a low SAB/SBA selects real-time transfer, and a high level selects stored data-with internal synchronization ensuring no race condition or metastability. This behavior is intrinsic to SN74AS652DWRG4's architecture and does not require external strobes or timing constraints beyond datasheet setup/hold times.
Is SN74AS652DWRG4 pin-compatible with SN74ALS652A?
Yes, SN74AS652DWRG4 is pin-compatible with SN74ALS652A in the DW package: both share identical 24-pin SOIC footprint, pin numbering, and terminal assignments (CLKAB, SAB, OEAB, A1–A8, GND, VCC, B1–B8, OEBA, SBA, CLKBA). However, SN74AS652DWRG4 is not a drop-in replacement in all designs due to its higher speed (90 MHz vs. 40 MHz), greater output drive (48 mA vs. 24 mA), and tighter timing requirements-requiring validation of setup/hold and propagation margins in the target system.
SN74AS652DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74AS652DWRG4 FAQ
1.How can I place an order for SN74AS652DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS652DWRG4 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 SN74AS652DWRG4 reliable?
The price and inventory of SN74AS652DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS652DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AS652DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS652DWRG4 transactions.
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4.How is shipping managed for SN74AS652DWRG4?
SN74AS652DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS652DWRG4 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 SN74AS652DWRG4?
For technical support, including SN74AS652DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS652DWRG4 requirements.
6.How does Aetrix verify that SN74AS652DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS652DWRG4 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 SN74AS652DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AS652DWRG4?
All SN74AS652DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS652DWRG4, 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 SN74AS652DWRG4 part is unused and in its original packaging.
Return procedure for SN74AS652DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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