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Texas Instruments SN74ACT3641-30PCB
- Part No.:
- SN74ACT3641-30PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ACT3641-30PCB.pdf
- Description:
- IC FIFO SYNC 1KX36 120HLQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ACT3641-30PCB from Texas Instruments is a 1024 × 36 clocked FIFO memory IC with dual asynchronous ports, synchronous retransmit capability, programmable almost-full/almost-empty flags, and mailbox registers for inter-processor communication. It operates at up to 67 MHz with 11 ns access time and uses low-power 0.8-µm Advanced CMOS technology for high-speed data buffering in telecom and DSP systems.
For engineers reviewing the SN74ACT3641-30PCB datasheet, SN74ACT3641-30PCB pinout, SN74ACT3641-30PCB application, or SN74ACT3641-30PCB equivalent, key selection criteria include dual-clock domain synchronization (CLKA/CLKB), 36-bit bidirectional port width, programmable flag offsets (X/Y registers), mailbox register flag behavior (MBF1/MBF2), and retransmit mode timing control via RTM/RFM signals.
Technical Context
The SN74ACT3641-30PCB implements a 1024-word × 36-bit dual-port SRAM FIFO with independent CLKA and CLKB clocks that may be asynchronous or coincident. Its status-flag logic uses two-stage synchronization per clock domain: IR and AF are synchronized to CLKA; OR and AE to CLKB.
It supports three flag-offset programming methods-preset (8 or 64), parallel load from Port A (A9–A0), or serial load via FS0/SD and FS1/SEN-and includes dedicated mailbox registers (Mail1/Mail2) with flag outputs (MBF1/MBF2) for handshake-based command transfer between processors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1024 × 36 bits: provides 36,864-bit buffer capacity for high-throughput data streaming between mismatched clock domains. |
| Max clock frequency | 67 MHz: enables real-time buffering of high-speed digital interfaces such as DSP-to-FPGA or processor-to-peripheral links. |
| Access time | 11 ns: ensures minimal latency for read-retransmit cycles and tight timing margins in synchronous control loops. |
| Flag synchronization | Two-stage flip-flop sync per port clock: reduces metastability risk when CLKA and CLKB operate asynchronously. |
| Operating temperature | 0°C to 70°C: validated for commercial-grade embedded systems including industrial controllers and communications equipment. |
| Technology node | 0.8-µm Advanced CMOS: delivers low static power consumption while maintaining TTL-compatible input thresholds and output drive strength. |
| Retransmit capability | Synchronous retransmit with shadow read pointer: allows repeatable playback of FIR filter coefficients or protocol headers without external memory management. |
Pinout & Package
SN74ACT3641-30PCB is housed in a 120-pin Thin Quad Flat Package (TQFP), designated PCB in TI documentation. Pin assignments follow the top-view layout shown in SCAS338C Rev C, with VCC/GND distributed across multiple pins for noise suppression and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35, B0–B35 | 36-bit bidirectional data ports | Port-A and Port-B each support full 36-bit parallel transfers; high-impedance state controlled by CSA/W/RA and CSB/W/RB respectively. |
| CLKA, CLKB | Free-running port clocks | Independent continuous clocks; all transfers gated on low-to-high transition; enable asynchronous or coincident operation between domains. |
| IR, OR, AF, AE | Synchronized status flags | IR/AF tied to CLKA; OR/AE tied to CLKB; two-stage sync prevents metastability in cross-clock handshaking. |
| MBA, MBB | Mailbox select inputs | Select Mail1 (A-side) or Mail2 (B-side) for read/write instead of FIFO; enables command/control channel alongside data path. |
| RTM, RFM | Retransmit control inputs | RTM initiates retransmit mode on rising CLKB; RFM resets read pointer to retransmit start point during active retransmit. |
| FS0/SD, FS1/SEN | Flag offset programming interface | Dual-purpose pins: configure flag-offset loading method (preset/parallel/serial) on RST edge; serial mode uses FS0/SD as data line. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous retransmit | Enables repeatable access to previously read FIFO data using shadow read pointer-critical for FIR filtering and protocol header replay without CPU intervention. |
| Programmable flag offsets | X (AE) and Y (AF) registers configurable via preset, parallel load (Port A), or serial load-allows dynamic adjustment of buffer watermark thresholds for variable-rate traffic. |
| Dual mailbox registers | Mail1 and Mail2 provide dedicated 36-bit command channels with MBF1/MBF2 flags-eliminates need for separate status registers in multi-processor mailbox implementations. |
| Asynchronous clock domains | CLKA and CLKB operate independently with no phase or frequency constraints-supports bridging between disparate bus speeds (e.g., 33 MHz PCI to 67 MHz DSP). |
| Reset-initiated flag initialization | RST requires four CLKA + four CLKB transitions; forces IR/AF low and OR/AE low/high per Table 4-ensures deterministic startup state before first data transfer. |
Applications
| Telecom Line Card Buffering | DSP Coefficient Streaming |
|---|---|
Use Scenario: Buffering ATM cell payloads between OC-3 PHY and framer ASIC operating at different clock rates. IC Role / Device Role / Timing Role: Clocked FIFO providing elastic storage with CLKA synchronized to framer clock and CLKB to PHY clock. Use Value: Eliminates packet loss due to clock domain mismatch; programmable AF/AE flags prevent overflow under bursty traffic conditions. | Use Scenario: Streaming FIR filter coefficients from host processor to fixed-point DSP core during runtime configuration. IC Role / Device Role / Timing Role: Dual-port FIFO acting as coefficient cache with retransmit mode enabling repeated coefficient reuse per filter tap. Use Value: Reduces external memory bandwidth pressure; mailbox registers deliver configuration commands without interrupting coefficient stream. |
| Industrial PLC I/O Expansion | Video Frame Synchronization |
Use Scenario: Aggregating sensor data from multiple RS-485 fieldbus nodes into a central controller with deterministic latency. IC Role / Device Role / Timing Role: Clock-domain bridge where CLKA samples isolated fieldbus data and CLKB feeds controller DMA engine. Use Value: Two-stage flag synchronization ensures reliable handshaking despite ground potential differences; mailbox registers convey node ID and error status. | Use Scenario: Aligning progressive-scan video frames between camera sensor interface (MIPI CSI-2) and display controller (LVDS). IC Role / Device Role / Timing Role: Frame-level FIFO buffering with retransmit mode supporting freeze-frame or slow-motion playback. Use Value: 1024-word depth accommodates full HD frame lines; programmable AE threshold triggers early fetch to avoid display underflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3631-30PCB | Same 1024 × 36 architecture but lacks mailbox registers and retransmit capability; no MBF1/MBF2 or RTM/RFM pins. | Suitable only for basic data buffering without command-channel or coefficient replay requirements. | Select when cost reduction is prioritized over mailbox/retransmit features and system design can manage control signaling externally. |
| SN74ACT3651-30PCB | Identical pinout and feature set but rated for extended temperature range (–40°C to 85°C); same 67 MHz max clock and 11 ns access time. | Required for automotive or outdoor industrial deployments where ambient temperature exceeds 70°C. | Choose for harsh-environment applications; otherwise SN74ACT3641-30PCB is optimal for commercial-temperature systems. |
Compared with SN74ACT3631-30PCB, SN74ACT3641-30PCB adds mailbox registers and retransmit logic essential for processor-to-processor messaging and coefficient reuse; compared with SN74ACT3651-30PCB, it trades extended temperature rating for lower cost in standard commercial environments.
Availability
SN74ACT3641-30PCB is available at Aetrix Electronics and suitable for telecom infrastructure, DSP subsystems, industrial PLCs, and video processing systems requiring stable component supply and long-term obsolescence planning.
Supply support for SN74ACT3641-30PCB 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 FIFO and interface IC expertise.
The SN74ACT3641-30PCB belongs to TI's ACT-family clocked FIFO product line, designed specifically for high-reliability, multi-clock-domain data buffering in telecom, test equipment, and real-time signal processing applications.
FAQ
What is the maximum supported clock frequency for SN74ACT3641-30PCB?
The SN74ACT3641-30PCB supports clock frequencies up to 67 MHz on both CLKA and CLKB ports. This specification is validated across the full commercial temperature range (0°C to 70°C) and reflects guaranteed timing performance under worst-case voltage and process corners per the SCAS338C datasheet.
How does the retransmit function work in SN74ACT3641-30PCB?
The SN74ACT3641-30PCB implements synchronous retransmit using a shadow read pointer activated when RTM is high and OR is high on a rising CLKB edge. Once enabled, RFM pulses reset the read pointer to the retransmit start location, allowing repeated access to a defined data segment-ideal for FIR coefficient loops or protocol header replay without CPU overhead.
Can SN74ACT3641-30PCB operate with completely asynchronous CLKA and CLKB clocks?
Yes, SN74ACT3641-30PCB is explicitly designed for asynchronous clock domains: CLKA and CLKB may run at different frequencies and phases. Its IR/AF flags are synchronized to CLKA, and OR/AE to CLKB, using two-stage flip-flops to suppress metastability-enabling robust handshaking even with unrelated clock sources.
What are the programming options for the almost-empty and almost-full flag offsets in SN74ACT3641-30PCB?
SN74ACT3641-30PCB supports three offset programming modes selected at reset via FS0/FS1: preset values (8 or 64), parallel load from Port A (A9–A0), or serial load via FS0/SD with FS1/SEN as enable. Each method writes to X (AE) and Y (AF) registers, with programmable ranges from 1 to 1020 words.
Is SN74ACT3641-30PCB pin-compatible with other devices in the same family?
Yes, SN74ACT3641-30PCB is pin-to-pin compatible with SN74ACT3631-30PCB and SN74ACT3651-30PCB in the 120-pin PCB package. All share identical pin assignments, electrical characteristics, and timing parameters-allowing drop-in replacement where mailbox or temperature requirements differ.
SN74ACT3641-30PCB 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:
- 33.4MHz
- Access Time:
- 15ns
- 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)
SN74ACT3641-30PCB FAQ
1.How can I place an order for SN74ACT3641-30PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3641-30PCB 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 SN74ACT3641-30PCB reliable?
The price and inventory of SN74ACT3641-30PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3641-30PCB is usually 5 days.
3.What payment methods are accepted for SN74ACT3641-30PCB?
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4.How is shipping managed for SN74ACT3641-30PCB?
SN74ACT3641-30PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3641-30PCB 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 SN74ACT3641-30PCB?
For technical support, including SN74ACT3641-30PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3641-30PCB requirements.
6.How does Aetrix verify that SN74ACT3641-30PCB is sourced from the original manufacturer or authorized distributors?
All SN74ACT3641-30PCB 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 SN74ACT3641-30PCB meets industry standards.
7.What is the process for return or replacement of SN74ACT3641-30PCB?
All SN74ACT3641-30PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3641-30PCB, 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 SN74ACT3641-30PCB part is unused and in its original packaging.
Return procedure for SN74ACT3641-30PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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