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Texas Instruments SN74ACT3622-30PCB
- Part No.:
- SN74ACT3622-30PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ACT3622-30PCB.pdf
- Description:
- IC FIFO SYNC 256X36X2 120HLQFP
- Quantity:
- Payment:
- Shipping:
Inventory:286
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Product details
Overview
SN74ACT3622-30PCB from Texas Instruments is a clocked bidirectional FIFO memory IC with dual 256 × 36 × 2 SRAM buffers, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 11 ns access time, and programmable almost-full/empty flags synchronized to respective clocks. It enables high-speed data bridging between microprocessor buses operating at different timing domains.
For engineers reviewing the SN74ACT3622-30PCB datasheet, SN74ACT3622-30PCB pinout, SN74ACT3622-30PCB application, or SN74ACT3622-30PCB equivalent, key selection criteria include its dual-port mailbox-bypass capability, two-stage flag synchronization for metastability mitigation, 120-pin thin quad flat (PCB) package, and compatibility with SN74ACT3632/SN74ACT3642 in system-level FIFO expansion.
Technical Context
The SN74ACT3622-30PCB integrates two independent clocked FIFOs (FIFO1 and FIFO2), each with 256 × 36-bit SRAM depth, separate read/write pointers, and fully synchronous interfaces gated by CLKA and CLKB. Each port features microprocessor-compatible control logic including chip select (CSA/CSB), enable (ENA/ENB), and write/read direction (W/RA/W/RB).
Flag generation uses two-stage synchronization: IRA, ORA, AFA, AEA are synchronized to CLKA; IRB, ORB, AFB, AEB to CLKB. Programmable almost-full/empty offsets (X1/Y1 for FIFO1; X2/Y2 for FIFO2) are loaded either via FS0/FS1 during reset or programmed from Port-A using A7–A0, supporting values 1–252.
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 bidirectionally. |
| Max Clock Frequency | 67 MHz - Enables high-throughput interconnect between fast microprocessors or ASICs without external clock division. |
| Access Time | 11 ns - Guarantees sub-15 ns latency for read/write cycles under worst-case commercial temperature (0°C to 70°C). |
| Flag Synchronization | Two-stage flip-flop - Reduces metastability risk when CLKA and CLKB operate asynchronously; critical for robust cross-clock-domain signaling. |
| Programmable Offset Range | 1 to 252 words - Allows precise tuning of almost-full/empty thresholds to match application-specific buffer management policies. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems, industrial controllers, and communications equipment. |
| Technology Node | 0.8 µm Advanced CMOS - Delivers low power consumption while maintaining TTL-compatible voltage levels (VCC = 5 V). |
Pinout & Package
SN74ACT3622-30PCB is housed in a 120-pin thin quad flat package (TQFP), designated "PCB" in TI documentation, with 0.4 mm lead pitch and exposed thermal pad (not electrically connected). Pin numbering follows standard counter-clockwise top-view layout starting from pin 1 (RST1) at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit parallel I/O path for FIFO2 read/write and Mail2 register access; high-impedance when CSA or W/RA high. |
| B0–B35 | Port-B bidirectional data bus | 36-bit parallel I/O path for FIFO1 read/write and Mail1 register access; high-impedance when CSB or W/RB low. |
| CLKA, CLKB | Independent port clocks | Asynchronous or coincident 67 MHz clocks; all port-A flags (IRA, ORA, AFA, AEA) synchronized to CLKA edge; all port-B flags to CLKB. |
| CSA, CSB | Chip select inputs | Active-low enables; disable port data drivers and block clock-gated transfers when deasserted. |
| W/RA, W/RB | Port-A/B read/write direction controls | W/RA high = write to FIFO1; W/RB low = write to FIFO2; both determine active data path (FIFO vs. mailbox) and driver state. |
| MBA, MBB | Mailbox select inputs | Select mail1/mail2 registers instead of FIFO output registers during read; enable command/control bypass without queuing delay. |
| RST1, RST2 | Independent FIFO reset inputs | Asynchronous reset requiring ≥4 CLKA + ≥4 CLKB transitions; latches FS0/FS1 to configure AF/AE offset loading method. |
| IRA, ORA, AFA, AEA | Port-A status flags | Synchronized to CLKA: IRA=low=full, ORA=low=empty, AFA=low=almost full, AEA=low=almost empty. |
| IRB, ORB, AFB, AEB | Port-B status flags | Synchronized to CLKB: IRB=low=full, ORB=low=empty, AFB=low=almost full, AEB=low=almost empty. |
| MBF1, MBF2 | Mailbox full flags | MBF1 low = mail1 written and unread; MBF2 low = mail2 written and unread; cleared by corresponding port read with MBA/MBB high. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | FIFO1 and FIFO2 operate with fully decoupled CLKA/CLKB - eliminates need for global clock distribution or phase alignment. |
| Mailbox-bypass registers | Two 36-bit dedicated registers (mail1/mail2) allow immediate command handoff between ports without FIFO queuing latency or pointer management overhead. |
| Programmable flag offsets | AF/AE thresholds configurable via FS0/FS1 presets (8/16/64) or full 1–252 range from Port-A - enables adaptive flow control in variable-bandwidth systems. |
| Metastability-hardened flag logic | All status flags use two-stage synchronizers per port clock - meets TI's published MTBF requirements for asynchronous clock domain crossing. |
| Pin-to-pin compatibility | Direct replacement for SN74ACT3632 and SN74ACT3642 - supports drop-in upgrades or design reuse across FIFO depth variants (256×36 vs. 512×36 vs. 1024×36). |
Applications
| Microprocessor Bus Bridging | DMA Controller Interface |
|---|---|
Use Scenario: Interfacing two microprocessors with mismatched bus timing, clock rates, or arbitration schemes. IC Role / Device Role / Timing Role: Bidirectional FIFO buffer with independent CLKA/CLKB domains and mailbox registers for handshake-free command exchange. Use Value: Eliminates software polling or external glue logic; enables deterministic latency for real-time task coordination between CPUs. |
Use Scenario: Connecting a DMA controller to multiple peripherals with differing burst lengths and readiness signals. IC Role / Device Role / Timing Role: Dual-port FIFO providing decoupled data staging for simultaneous read/write operations across clock domains. Use Value: Prevents DMA stalls due to peripheral readiness mismatches; allows continuous data streaming without CPU intervention. |
| Communications Protocol Translation | Industrial Control Data Aggregation |
Use Scenario: Converting between legacy serial protocol framing and parallel packetized data for network interface processors. IC Role / Device Role / Timing Role: Clocked FIFO with programmable almost-full/empty flags acting as adaptive flow-control throttle between protocol layers. Use Value: Maintains line-rate throughput while absorbing jitter from variable-length packet assembly/disassembly cycles. |
Use Scenario: Consolidating sensor data streams from multiple fieldbus nodes into a central PLC or HMI controller. IC Role / Device Role / Timing Role: High-reliability FIFO with metastability-hardened flags ensuring deterministic status reporting in noisy industrial environments. Use Value: Guarantees no data loss during transient EMI events; supports fail-safe buffer monitoring via AFA/AEA thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked bidirectional FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3632-30PCB | 512 × 36 × 2 depth; identical pinout, timing, and flag architecture; same 120-pin PCB package. | Higher buffer capacity required for longer burst transfers or deeper pipeline staging. | Select when >256-word depth is needed without redesigning PCB layout or firmware interface logic. |
| SN74ACT3642-30PCB | 1024 × 36 × 2 depth; pin-compatible; shares same control protocol, flag behavior, and mailbox functionality. | Used in high-throughput video/audio streaming or radar signal processing where extended latency tolerance justifies larger memory. | Choose for applications demanding maximum FIFO depth while retaining identical timing margins and software abstraction layer. |
Compared with SN74ACT3632-30PCB and SN74ACT3642-30PCB, the SN74ACT3622-30PCB offers optimal balance of latency, power, and board space for mid-depth buffering - its 256-word capacity minimizes access delay while retaining full feature parity and drop-in upgrade path to deeper variants.
Availability
SN74ACT3622-30PCB is available at Aetrix Electronics and suitable for microprocessor bus bridging, DMA controller interfacing, communications protocol translation, and industrial control data aggregation requiring stable component supply and long-term production continuity.
Supply support for SN74ACT3622-30PCB 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 expertise in high-reliability interface and memory products.
The SN74ACT3622-30PCB belongs to TI's ACT-family advanced CMOS FIFO portfolio, designed specifically for deterministic, low-latency data buffering across asynchronous clock domains in industrial, communications, and computing systems.
FAQ
What is the memory configuration of the SN74ACT3622-30PCB?
The SN74ACT3622-30PCB contains two independent 256 × 36-bit SRAM FIFOs - FIFO1 and FIFO2 - enabling simultaneous bidirectional data buffering. Each FIFO supports 36-bit parallel data paths, with separate read/write pointers, status flags, and clock domains (CLKA and CLKB). This configuration delivers 256-word depth per port without shared memory contention.
How does the SN74ACT3622-30PCB handle asynchronous clock domains?
The SN74ACT3622-30PCB uses two-stage synchronizers on all status flags: IRA, ORA, AFA, AEA are synchronized to CLKA; IRB, ORB, AFB, AEB to CLKB. This architecture reduces metastability risk when CLKA and CLKB operate asynchronously, ensuring reliable flag assertion/deassertion across clock boundaries without external resynchronization logic.
Can the almost-full and almost-empty thresholds be customized on the SN74ACT3622-30PCB?
Yes - the SN74ACT3622-30PCB supports programmable almost-full (AFA/AFB) and almost-empty (AEA/AEB) thresholds. Offsets are loaded either via FS0/FS1 pins during reset (selecting preset values 8, 16, or 64) or programmed from Port-A using A7–A0, allowing full 1–252 word range. This enables precise flow control tailored to application-specific buffer management needs.
What is the role of the mailbox registers in the SN74ACT3622-30PCB?
The SN74ACT3622-30PCB includes two 36-bit mailbox registers (mail1 and mail2) that bypass FIFO queuing entirely. They enable immediate command/control data transfer between Port-A and Port-B - for example, sending an interrupt request or configuration update without waiting for FIFO fill/empty conditions. MBA and MBB select mailbox access during read/write cycles.
Is the SN74ACT3622-30PCB pin-compatible with other devices in its family?
Yes - the SN74ACT3622-30PCB is pin-to-pin compatible with SN74ACT3632-30PCB (512×36) and SN74ACT3642-30PCB (1024×36), sharing identical 120-pin thin quad flat (PCB) packaging, control signal mapping, timing specifications, and flag behavior. This allows seamless capacity scaling without PCB or firmware changes.
SN74ACT3622-30PCB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 120-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 18K (256 x 36 x 2)
- 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:
- 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)
SN74ACT3622-30PCB FAQ
1.How can I place an order for SN74ACT3622-30PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3622-30PCB 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 SN74ACT3622-30PCB reliable?
The price and inventory of SN74ACT3622-30PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3622-30PCB is usually 5 days.
3.What payment methods are accepted for SN74ACT3622-30PCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3622-30PCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT3622-30PCB?
SN74ACT3622-30PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3622-30PCB 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 SN74ACT3622-30PCB?
For technical support, including SN74ACT3622-30PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3622-30PCB requirements.
6.How does Aetrix verify that SN74ACT3622-30PCB is sourced from the original manufacturer or authorized distributors?
All SN74ACT3622-30PCB 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 SN74ACT3622-30PCB meets industry standards.
7.What is the process for return or replacement of SN74ACT3622-30PCB?
All SN74ACT3622-30PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3622-30PCB, 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 SN74ACT3622-30PCB part is unused and in its original packaging.
Return procedure for SN74ACT3622-30PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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