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Texas Instruments SN74ACT3641-15PCB
- Part No.:
- SN74ACT3641-15PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ACT3641-15PCB.pdf
- Description:
- IC FIFO SYNC 1KX36 120HLQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
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Product details
Overview
SN74ACT3641-15PCB from Texas Instruments is a 1024 × 36 clocked FIFO memory IC with dual asynchronous ports, supporting up to 67 MHz clock frequency, 11 ns access time, and synchronous retransmit capability. It buffers data between port A and port B in high-speed digital systems such as DSP interfaces and DMA controllers.
For engineers reviewing the SN74ACT3641-15PCB datasheet, SN74ACT3641-15PCB pinout, SN74ACT3641-15PCB application, or SN74ACT3641-15PCB equivalent, key selection criteria include programmable almost-full/empty flags, mailbox register support, dual-port SRAM architecture, and pin-to-pin compatibility with SN74ACT3631 and SN74ACT3651 for scalable datapath expansion.
Technical Context
The SN74ACT3641-15PCB implements a dual-clock, synchronous FIFO using 1024 × 36-bit SRAM with independent CLKA and CLKB domains. Its two-stage synchronized flags (IR/AF on CLKA; OR/AE on CLKB) mitigate metastability during asynchronous clock domain crossing.
It integrates mailbox registers (mail1/mail2) with dedicated MBA/MBB controls and supports three flag-offset programming modes-preset (8 or 64), parallel load from port A, or serial load via FS0/SD and FS1/SEN-enabling flexible buffer management in real-time communication protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1024 × 36-bit SRAM - provides 36,864 bits of buffered storage for high-throughput data streaming |
| Max clock frequency | 67 MHz - enables real-time buffering in fast bus interfaces like PCI or custom ASIC interconnects |
| Access time | 11 ns - guarantees sub-15 ns latency for read/write operations critical in timing-constrained systems |
| Operating temperature | 0°C to 70°C - validated for commercial-grade embedded applications without extended thermal derating |
| Technology node | 0.8-µm Advanced CMOS - delivers low power consumption while maintaining TTL-compatible voltage levels |
| Flag synchronization | Two-stage flip-flop sync - reduces metastability risk when CLKA and CLKB operate asynchronously |
Pinout & Package
SN74ACT3641-15PCB uses a 120-pin Thin Quad Flat (TQFP) package, designated PCB in TI documentation, with exposed pad not electrically connected. Pin assignments follow TI SCAS338C revision October 1997.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit interface for writing/reading FIFO or mail1 register under CSA/W/RA control |
| B0–B35 | Port-B bidirectional data bus | 36-bit interface for reading/writing FIFO or mail2 register under CSB/W/RB control |
| CLKA, CLKB | Free-running port clocks | Independent synchronous clocks; IR/AF tied to CLKA edge, OR/AE to CLKB edge |
| ENA, ENB | Port master enables | Enable/disable all port activity; required high for any CLKA/CLKB-triggered operation |
| CSA, CSB | Chip select inputs | Assert low to activate port A/B data drivers and enable clock-gated transfers |
| W/RA, W/RB | Port write/read selects | W/RA high = write to port A; W/RB high = read from port B (inverted logic) |
| IR, OR, AF, AE | Status flags | IR/AF synchronized to CLKA; OR/AE to CLKB; indicate FIFO fill level with programmable thresholds |
| MBA, MBB | Mailbox select | High selects mail1 (A-side) or mail2 (B-side); enables command/control message passing |
| RTM, RFM | Retransmit controls | RTM initiates retransmit mode; RFM resets read pointer to start retransmit loop |
| RST | Asynchronous reset | Requires four rising edges on both CLKA and CLKB while low to initialize pointers and flags |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous retransmit | Enables repeat reads from user-defined SRAM address without external controller intervention |
| Dual mailbox registers | 36-bit mail1 (A→B) and mail2 (B→A) allow handshake-free command exchange between processors |
| Programmable flag offsets | AE/AF thresholds configurable via preset, parallel (port A), or serial (FS0/SD) methods for dynamic flow control |
| Metastability-hardened flags | Two-stage synchronization per flag ensures reliable status reporting across asynchronous clock domains |
| Microprocessor interface logic | Integrated CSA/CSB, W/RA/W/RB, ENA/ENB decoding eliminates need for external glue logic |
Applications
| DSP Data Streaming | DMA Controller Buffering |
|---|---|
Use Scenario: Real-time FIR filtering where input samples arrive at variable rates and must be aligned with coefficient updates. IC Role / Device Role / Timing Role: Clocked FIFO acting as elastic buffer between ADC sampling clock and DSP core clock domains. Use Value: Synchronous retransmit allows repeated coefficient fetches; programmable AF/AE prevents overflow/underflow during burst transfers. | Use Scenario: High-bandwidth peripheral-to-memory transfers in embedded controllers with mismatched bus speeds. IC Role / Device Role / Timing Role: Dual-port FIFO decouples peripheral write rate (via CLKA) from memory read rate (via CLKB). Use Value: Mailbox registers handle DMA setup commands independently of data flow; two-stage flag sync ensures reliable handshaking. |
| Multi-Processor Communication | Protocol Bridge Interface |
Use Scenario: Asymmetric multiprocessing where one CPU writes sensor logs and another reads for analysis. IC Role / Device Role / Timing Role: Bidirectional FIFO with mailboxes serves as shared memory conduit with hardware-enforced mutual exclusion. Use Value: MBA/MBB-selectable mail registers pass configuration tokens; IR/OR flags coordinate full/empty states without software polling. | Use Scenario: Bridging legacy parallel bus (e.g., ISA) to modern serial interface (e.g., SPI-based FPGA logic). IC Role / Device Role / Timing Role: Clock-domain translator buffering bursts from slow host to fast slave clock domain. Use Value: Independent CLKA/CLKB allow native timing on both sides; programmable AE/AF adapt to varying packet sizes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3631-15PCB | Same 1024 × 36 capacity, identical pinout, but lacks mailbox registers and retransmit functionality | Suitable only for basic FIFO buffering without inter-processor messaging or repeat-read requirements | Select when cost sensitivity outweighs need for mailboxes or retransmit; verify absence of MBF1/MBF2/RTM/RFM in design |
| SN74ACT3651-15PCB | Same footprint and flag logic, but supports 2048 × 36 depth and higher clock tolerance (75 MHz) | Used in deeper buffering scenarios requiring >1K-word storage or tighter timing margins | Choose for future-proofing or higher throughput; confirm PCB layout accommodates same 120-pin TQFP outline |
Compared with SN74ACT3631-15PCB, SN74ACT3641-15PCB adds mailbox registers and retransmit capability at no pinout change; versus SN74ACT3651-15PCB, it trades depth and speed for lower cost and proven stability in established 1K-word designs.
Availability
SN74ACT3641-15PCB is available at Aetrix Electronics and suitable for DSP interface design, DMA controller development, multi-processor communication systems, and protocol bridge implementations requiring stable component supply across long-lifecycle industrial programs.
Supply support for SN74ACT3641-15PCB 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74ACT3641-15PCB belongs to TI's ACT-family advanced CMOS FIFO product line, designed specifically for high-speed, low-power, clock-domain bridging in real-time digital signal and control systems.
FAQ
What is the maximum operating clock frequency supported by the SN74ACT3641-15PCB?
The SN74ACT3641-15PCB supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs, as specified in the SCAS338C datasheet. This rating applies across the full 0°C to 70°C operating temperature range and is validated using standard test conditions with 50-pF loads. The SN74ACT3641-15PCB achieves this performance using 0.8-µm Advanced CMOS technology and maintains timing integrity through two-stage synchronized flag logic.
Does the SN74ACT3641-15PCB support asynchronous clock domains between port A and port B?
Yes, the SN74ACT3641-15PCB explicitly supports asynchronous operation between CLKA and CLKB - they may be coincident or completely independent. Its IR and AF flags are synchronized to CLKA, while OR and AE are synchronized to CLKB using two-stage flip-flop chains to suppress metastability. This architecture enables robust data transfer across unrelated clock domains without external synchronizers.
How are the almost-empty (AE) and almost-full (AF) flag thresholds programmed on the SN74ACT3641-15PCB?
The SN74ACT3641-15PCB supports three AE/AF offset programming methods selected during RST assertion: preset values (8 or 64), parallel load from port A (using A9–A0), or serial load via FS0/SD and FS1/SEN. Each method writes to dedicated X (AE) and Y (AF) registers. The SN74ACT3641-15PCB requires no external configuration EEPROM or microcontroller - all programming occurs in-system via standard control signals.
What is the function of the mailbox registers in the SN74ACT3641-15PCB?
The SN74ACT3641-15PCB contains two independent 36-bit mailbox registers: mail1 (accessible via port A) and mail2 (accessible via port B). MBA and MBB select mailbox vs. FIFO access. MBF1 and MBF2 flags signal new data arrival. These registers enable non-blocking command/control exchange - for example, a processor can write a DMA descriptor to mail1 while streaming data through the main FIFO - all without software arbitration.
Is the SN74ACT3641-15PCB pin-to-pin compatible with other devices in the same family?
Yes, the SN74ACT3641-15PCB is pin-to-pin compatible with SN74ACT3631-15PCB and SN74ACT3651-15PCB in the 120-pin PCB package. All share identical pin assignments for A0–A35, B0–B35, CLKA/CLKB, CSA/CSB, ENA/ENB, W/RA/W/RB, and flag outputs. Differences lie in internal features (e.g., mailboxes, retransmit, depth), not pinout - enabling drop-in replacement where functional requirements align.
SN74ACT3641-15PCB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 120-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 36K (1K x 36)
- Function:
- Synchronous
- Data Rate:
- 66.7MHz
- Access Time:
- 11ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 400µA
- Bus Directional:
- Bi-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- Yes
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 120-HLQFP (14x14)
SN74ACT3641-15PCB FAQ
1.How can I place an order for SN74ACT3641-15PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3641-15PCB 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 SN74ACT3641-15PCB reliable?
The price and inventory of SN74ACT3641-15PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3641-15PCB is usually 5 days.
3.What payment methods are accepted for SN74ACT3641-15PCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3641-15PCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT3641-15PCB?
SN74ACT3641-15PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3641-15PCB 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 SN74ACT3641-15PCB?
For technical support, including SN74ACT3641-15PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3641-15PCB requirements.
6.How does Aetrix verify that SN74ACT3641-15PCB is sourced from the original manufacturer or authorized distributors?
All SN74ACT3641-15PCB 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 SN74ACT3641-15PCB meets industry standards.
7.What is the process for return or replacement of SN74ACT3641-15PCB?
All SN74ACT3641-15PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3641-15PCB, 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 SN74ACT3641-15PCB part is unused and in its original packaging.
Return procedure for SN74ACT3641-15PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT3641-15PCB Tags
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7201LA15JGI
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7204L12JG
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72V82L15PAG8
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7205L15JGI
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7208L20JG
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72V2105L10PFG
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72V2111L15PFGI
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72V2113L6PFG
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72V36110L6PFG
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7202LA25JGI
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SN74V245-15PAG
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