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Texas Instruments SN74ACT3622-15PCB
- Part No.:
- SN74ACT3622-15PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ACT3622-15PCB.pdf
- Description:
- IC FIFO SYNC 256X36X2 120HLQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ACT3622-15PCB from Texas Instruments is a clocked bidirectional FIFO memory IC with dual 256 × 36 SRAM buffers, supporting asynchronous or coincident 67 MHz clocks (CLKA/CLKB), 11 ns read access time, and programmable almost-full/almost-empty flags synchronized to respective port clocks. It enables high-speed data bridging between mismatched microprocessor buses in telecom backplanes and industrial real-time controllers.
For engineers reviewing the SN74ACT3622-15PCB datasheet, SN74ACT3622-15PCB pinout, SN74ACT3622-15PCB application, or SN74ACT3622-15PCB equivalent, key selection criteria include dual-port flag synchronization timing, mailbox-bypass register behavior, FIFO reset sequencing requirements, and PCB-package pin compatibility with SN74ACT3632/SN74ACT3642 for drop-in upgrades.
Technical Context
The SN74ACT3622-15PCB integrates two independent 256-word × 36-bit synchronous FIFOs (FIFO1 and FIFO2), each with separate write/read pointers, two-stage metastability-hardened status flags (IRA/ORA/AEA/AFA synchronized to CLKA; IRB/ORB/AEB/AFB to CLKB), and dedicated 36-bit mailbox registers (Mail1/Mail2) for non-queued command transfer. Flag offset registers (X1/Y1 for FIFO1; X2/Y2 for FIFO2) are programmable via port-A writes or preset during reset using FS0/FS1 latching.
Its control logic implements strict port isolation: CLKA governs all FIFO1 writes and FIFO2 reads plus Mail2 access; CLKB governs FIFO2 writes and FIFO1 reads plus Mail1 access. Reset requires four low-to-high transitions on both clocks while RST1/RST2 are asserted, initializing pointers and forcing IR/OR flags low and AF flags high - mandatory before first write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 256 × 36 × 2 - Dual independent FIFOs, each buffering 256 words of 36-bit data without shared address space. |
| Max Clock Frequency | 67 MHz - Enables 67 million word transfers per second per port under timing-compliant conditions. |
| Read Access Time | 11 ns - Minimum delay from CLKA/CLKB rising edge to valid data at A0–A35/B0–B35 outputs during read cycles. |
| Flag Synchronization | Two-stage flip-flop sync - Reduces metastability risk when CLKA and CLKB operate asynchronously; OR/IR/AF/AE flags exhibit 2-cycle latency relative to FIFO state changes. |
| Operating Temperature | 0°C to 70°C - Commercial-grade thermal range suitable for non-military embedded systems and industrial control cabinets. |
| Technology Node | 0.8 µm Advanced CMOS - Delivers low static power consumption while maintaining TTL-compatible input thresholds and output drive strength. |
Pinout & Package
SN74ACT3622-15PCB uses a 120-pin Thin Quad Flat Package (TQFP), designated "PCB" in TI documentation, with 0.4 mm lead pitch and exposed thermal pad. Pin numbering follows standard TQFP top-view layout with pins 1–30 (top row), 31–60 (right), 61–90 (bottom), and 91–120 (left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit parallel interface for FIFO2 read/FIFO1 write; high-impedance when CSA high or W/RA high. |
| B0–B35 | Port-B bidirectional data bus | 36-bit parallel interface for FIFO1 read/FIFO2 write; high-impedance when CSB high or W/RB low. |
| CLKA / CLKB | Asynchronous port clocks | Continuous free-running clocks; all port-A operations synchronized to CLKA edges; all port-B operations to CLKB edges. |
| CSA / CSB | Port chip select inputs | Active-low enables; disable port I/O drivers and block clock-gated transfers when deasserted. |
| W/RA / W/RB | Port write/read direction controls | W/RA high = Port-A write; W/RB low = Port-B write; both determine data flow direction per clock edge. |
| ENA / ENB | Port enable inputs | High enables clock-gated transfers; required alongside CSA/CSB and W/RA/W/RB for valid operation. |
| IRA / IRB | Input-ready flags | Synchronized to CLKA/CLKB; low indicates FIFO1/FIFO2 full and blocks further writes until space becomes available. |
| ORA / ORB | Output-ready flags | Synchronized to CLKA/CLKB; high indicates valid data present in FIFO2/FIFO1 output register for immediate read. |
| MBA / MBB | Mailbox select inputs | High selects Mail2/Mail1 register instead of FIFO output register for port-A/port-B data reads/writes. |
| MBF1 / MBF2 | Mailbox full flags | Low indicates Mail1/Mail2 contains unread data; set high by corresponding port read with MBA/MBB asserted. |
| RST1 / RST2 | FIFO reset inputs | Asynchronous active-high resets; require four CLKA+CLKB transitions while low to initialize pointers and flags. |
| FS0 / FS1 | Flag offset select inputs | Latched on RST1/RST2 rising edge to select preset values (8/16/64) for AE/AF offset registers X1/Y1/X2/Y2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables seamless data rate translation between 67 MHz CPU bus and 40 MHz peripheral bus without external arbitration logic. |
| Programmable almost-full/almost-empty offsets | Four 8-bit offset registers (X1/Y1/X2/Y2) allow precise buffer watermarking - critical for DMA burst optimization and interrupt coalescing. |
| Mailbox-bypass registers | Two 36-bit registers (Mail1/Mail2) provide zero-latency command channel between ports, avoiding FIFO queuing delays for control messages. |
| Metastability-hardened flag synchronization | Two-stage synchronizers on all status flags reduce failure probability to <1e-9 per hour under worst-case async clock skew conditions. |
| Pin-to-pin compatibility | Direct replacement for SN74ACT3632 and SN74ACT3642 in PCB layouts - same pinout, identical footprint, no redesign needed. |
Applications
| Telecom Line Card Data Bridging | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Bridging between TDM framer ASIC (67 MHz) and slower DSP subsystem (33 MHz) in optical line cards. IC Role / Device Role / Timing Role: Dual-clock FIFO decouples clock domains while preserving packet order and enabling elastic store-and-forward buffering. Use Value: Eliminates need for external clock domain crossing logic; 256-word depth absorbs jitter-induced bursts without packet loss. |
Use Scenario: Interfacing motion controller FPGA (50 MHz) with legacy I/O module MCU (25 MHz) in modular PLC chassis. IC Role / Device Role / Timing Role: Bidirectional FIFO handles simultaneous command writes and status reads across mismatched buses with deterministic latency. Use Value: Mailbox registers deliver urgent fault commands within one CLKA cycle; programmable AF flags trigger DMA reload before buffer underflow. |
| Medical Imaging Data Acquisition | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Aggregating parallel ADC streams (60 MHz) into unified frame buffer for GPU preprocessing in MRI systems. IC Role / Device Role / Timing Role: FIFO2 accepts sensor data; FIFO1 feeds GPU; mailbox passes frame metadata and trigger signals. Use Value: 11 ns access time ensures real-time frame capture; dual almost-full flags prevent overflow during GPU stalls. |
Use Scenario: Consolidating radar, camera, and LiDAR data streams (40–67 MHz) into central fusion ECU with variable processing load. IC Role / Device Role / Timing Role: Acts as rate-matching buffer between high-speed sensor interfaces and lower-bandwidth CAN FD/Ethernet AVB transport layer. Use Value: Asynchronous clock support eliminates need for global system clock; programmable AE flags enable adaptive bandwidth throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3632-15PCB | Identical pinout, same 256×36×2 architecture, but lacks mailbox registers and programmable flag offsets. | Cannot support concurrent command/data paths; requires external logic for control message handling. | Select when mailbox functionality is unnecessary and cost reduction is prioritized over design flexibility. |
| SN74ACT3642-15PCB | Same package and pinout; adds separate reset control for each mailbox register and enhanced flag glitch immunity. | Supports more robust mailbox handshaking in safety-critical systems where mail flag corruption must be minimized. | Choose for automotive or medical applications requiring higher mailbox reliability; otherwise SN74ACT3622-15PCB suffices. |
Compared with SN74ACT3632-15PCB and SN74ACT3642-15PCB, SN74ACT3622-15PCB provides the optimal balance of mailbox capability, flag programmability, and proven field reliability - making it the preferred choice for new designs requiring flexible inter-processor communication without added complexity.
Availability
SN74ACT3622-15PCB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, medical imaging, and automotive ADAS applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT3622-15PCB 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 U.S.-based semiconductor company founded in 1930, specializing in analog and embedded processing technologies with broad industrial, automotive, and communications product portfolios.
The SN74ACT3622-15PCB belongs to TI's ACT-family advanced CMOS FIFO product line, designed specifically for high-reliability, multi-clock-domain data buffering in real-time embedded systems where deterministic latency and metastability resilience are critical.
FAQ
What is the function of the FS0 and FS1 pins on the SN74ACT3622-15PCB?
The FS0 and FS1 pins on the SN74ACT3622-15PCB are flag offset select inputs that determine preset values for the almost-empty (X1/X2) and almost-full (Y1/Y2) offset registers during FIFO reset. Their states are latched on the rising edge of RST1 or RST2, selecting values of 8, 16, or 64 - or enabling full 8-bit programming from port-A when both are low. This allows rapid configuration without software overhead.
How does the mailbox bypass feature work in the SN74ACT3622-15PCB?
The SN74ACT3622-15PCB implements two 36-bit mailbox registers (Mail1 and Mail2) accessible independently of the FIFOs. When MBA is high, port-A reads/writes target Mail2; when MBB is high, port-B reads/writes target Mail1. Each mailbox has a dedicated flag (MBF1/MBF2) that goes low on write and high on corresponding port read - enabling hardware handshaking without FIFO queuing delays.
What are the reset requirements for reliable operation of the SN74ACT3622-15PCB?
The SN74ACT3622-15PCB requires separate asynchronous reset sequences for each FIFO: RST1 must be held low for at least four CLKA and four CLKB rising edges to initialize FIFO1; RST2 similarly for FIFO2. Both resets must complete before any data write - failure to do so results in undefined pointer states and corrupted flag behavior. Power-up reset is mandatory.
Can the SN74ACT3622-15PCB operate with CLKA and CLKB running at different frequencies?
Yes, the SN74ACT3622-15PCB explicitly supports asynchronous clock operation: CLKA and CLKB may run at different frequencies (up to 67 MHz each), with independent phase relationships. All status flags (IRA/ORA/AEA/AFA synchronized to CLKA; IRB/ORB/AEB/AFB to CLKB) use two-stage synchronizers to suppress metastability, ensuring reliable cross-domain signaling without external circuitry.
What is the significance of the "15" in the part number SN74ACT3622-15PCB?
The "15" in SN74ACT3622-15PCB denotes the commercial temperature grade (0°C to 70°C) and confirms compliance with the 15 ns access time specification - though the device achieves 11 ns typical read access. This suffix aligns with TI's historical speed-grade coding, where "-15" indicates guaranteed performance up to 67 MHz operation under specified voltage and temperature conditions.
SN74ACT3622-15PCB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 120-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 18K (256 x 36 x 2)
- 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:
- Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 120-HLQFP (14x14)
SN74ACT3622-15PCB FAQ
1.How can I place an order for SN74ACT3622-15PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3622-15PCB 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 SN74ACT3622-15PCB reliable?
The price and inventory of SN74ACT3622-15PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3622-15PCB is usually 5 days.
3.What payment methods are accepted for SN74ACT3622-15PCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3622-15PCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT3622-15PCB?
SN74ACT3622-15PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3622-15PCB 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 SN74ACT3622-15PCB?
For technical support, including SN74ACT3622-15PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3622-15PCB requirements.
6.How does Aetrix verify that SN74ACT3622-15PCB is sourced from the original manufacturer or authorized distributors?
All SN74ACT3622-15PCB 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 SN74ACT3622-15PCB meets industry standards.
7.What is the process for return or replacement of SN74ACT3622-15PCB?
All SN74ACT3622-15PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3622-15PCB, 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 SN74ACT3622-15PCB part is unused and in its original packaging.
Return procedure for SN74ACT3622-15PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT3622-15PCB 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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SN74ALVC7804-40DL
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7202LA25JGI
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SN74V245-15PAG
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