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Texas Instruments SN74ACT72221L15RJ
- Part No.:
- SN74ACT72221L15RJ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- -
- Datasheet:
-
SN74ACT72221L15RJ.pdf
- Description:
- IC FIFO SYNC 1KX9 DUAL WIDTH
- Quantity:
- Payment:
- Shipping:
Inventory:9,856
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Product details
Overview
SN74ACT72221L15RJ from Texas Instruments is a 1024 × 9-bit synchronous dual-clock FIFO memory IC with CMOS dual-port SRAM architecture, 15 ns write/read cycle time, TTL-compatible inputs, and programmable almost-empty/almost-full flags. It operates from 4.5 V to 5.5 V at 0°C–70°C and is used in high-speed asynchronous data bridging between independent clock domains.
For engineers reviewing the SN74ACT72221L15RJ datasheet, SN74ACT72221L15RJ pinout, SN74ACT72221L15RJ application, or SN74ACT72221L15RJ equivalent, key selection criteria include its 1024-word depth, 9-bit bus width with parity support, flag synchronization to respective clocks (EF to RCLK, FF to WCLK), and configurable flag offset registers via WEN2/LD.
Technical Context
This FIFO implements first-in-first-out buffering using internal read/write address counters synchronized to independent RCLK and WCLK signals. Its dual-port SRAM core supports fully asynchronous or coincident clock operation, with write and read enable logic (WEN1/WEN2-LD, REN1/REN2) gating transitions on clock edges.
Status flags are edge-synchronized: EF and PAE align to RCLK rising edges; FF and PAF align to WCLK rising edges. Flag offsets are programmable via four 8-bit registers accessed through WEN2/LD-controlled write sequences, defaulting to empty+7 and full−7 for SN74ACT72221L.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 1024 × 9-bit words - provides 9.2 kB of buffered storage for byte-plus-parity or packet-framing data paths. |
| Write/Read Cycle Time | 15 ns - enables up to 66.7 MHz clock operation, supporting high-throughput rate-matching in graphics and comms systems. |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS logic families and robust noise margin. |
| Flag Synchronization | EF/PAE sync to RCLK; FF/PAF sync to WCLK - prevents metastability in boundary detection across clock domains. |
| Programmable Flag Offsets | Four 8-bit registers (empty LSB/MSB, full LSB/MSB) - allow custom trigger points for flow control without hardware redesign. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including industrial controllers and test equipment. |
| TTL-Compatible Inputs | VIL ≤ 0.8 V, VIH ≥ 2 V - permits direct interfacing with legacy 5 V logic without level-shifting circuitry. |
Pinout & Package
SN74ACT72221L15RJ is housed in a 32-pin plastic J-leaded chip carrier (RJ) package with gull-wing leads, designed for surface-mount assembly and thermal reliability in commercial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D8 | Data input bus | 9-bit parallel input path accepting byte + parity or framing bits; latched on WCLK↑ when WEN1 active. |
| Q0–Q8 | Data output bus | 9-bit parallel output path; driven only when OE low and EF high; synchronized to RCLK↑. |
| WCLK, RCLK | Independent clock inputs | Edge-triggered clocks for write and read operations; may be asynchronous or tied for single-clock mode. |
| WEN1, WEN2/LD | Write control / flag programming | WEN1 enables writes; WEN2/LD selects dual-write-enable mode or load-enable for offset register access during reset. |
| REN1, REN2 | Read enable inputs | Both must be low to permit reads on RCLK↑; REN2 grounded in width-expansion configurations. |
| OE | Output enable | Active-low control for Q0–Q8 tri-state; allows bus sharing without external buffers. |
| EF, FF | Status flag outputs | EF low = FIFO empty (read inhibited); FF low = FIFO full (write inhibited); each synchronized to respective clock domain. |
| PAE, PAF | Programmable status flags | PAE low = near-empty condition; PAF low = near-full condition; offsets configurable via WEN2/LD sequence. |
| RS | Asynchronous reset | Initializes read/write pointers, clears output register, sets flags to known state (FF/PAF high, EF/PAE low). |
| VCC, GND | Power supply terminals | Single 5 V supply; decoupling required per high-speed CMOS practice to maintain signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous dual-clock FIFO | Enables deterministic data transfer between independently clocked subsystems without handshake logic. |
| Bit-width expandable architecture | Multiple devices can be paralleled to form 18-, 27-, or wider data paths while retaining individual flag monitoring. |
| Programmable almost-empty/almost-full flags | Customizable flow-control thresholds eliminate fixed-latency bottlenecks in real-time streaming applications. |
| Edge-synchronized status flags | EF/PAE aligned to RCLK, FF/PAF aligned to WCLK - guarantees setup/hold compliance in multi-domain timing analysis. |
| Reset-initiated pointer and flag initialization | Guarantees known FIFO state after power-up or system fault recovery, critical for deterministic boot sequences. |
Applications
| Graphics Data Buffering | Communication Protocol Queuing |
|---|---|
Use Scenario: Buffering pixel data between GPU and display controller operating at mismatched refresh rates. IC Role / Device Role / Timing Role: Asynchronous FIFO providing rate adaptation and jitter absorption between video pipeline stages. Use Value: Eliminates frame tearing and stutter by absorbing timing variance; 9-bit width supports RGB8 + sync bit or YUV data packing. | Use Scenario: Storing packetized data between UART-based peripherals and a high-speed host processor. IC Role / Device Role / Timing Role: First-in-first-out queue isolating serial receive/transmit logic from CPU bus arbitration delays. Use Value: Prevents data loss during burst transfers; programmable PAF/PAE enables adaptive interrupt triggering before overflow/underflow. |
| Industrial Control Bus Interface | Test Equipment Data Acquisition |
Use Scenario: Interfacing a slow-response PLC I/O module with a fast-scanning motion controller. IC Role / Device Role / Timing Role: Synchronous FIFO acting as temporal decoupler between deterministic real-time control loop and variable-latency fieldbus. Use Value: Maintains control loop determinism while accommodating fieldbus jitter; empty/full flags prevent command starvation or overrun. | Use Scenario: Capturing high-speed analog-to-digital samples before host PC transfer over USB or PCIe. IC Role / Device Role / Timing Role: High-bandwidth data staging buffer between ADC sampling engine and interface controller. Use Value: 15 ns cycle time supports >66 MHz sampling rates; 1024-word depth accommodates multi-channel burst capture without DMA overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72221L15JI | Same 1024 × 9 organization, 15 ns speed grade, and RJ package; identical pinout and flag behavior; manufactured by IDT (now Renesas). | Qualified for extended temperature range (−40°C to +85°C); higher ICC typical current (170 mA vs. 160 mA at 20 MHz). | Select IDT72221L15JI for industrial environments requiring wider temperature tolerance and proven long-term availability. |
| SN74ACT72221L20RJ | Same die and functionality but rated for 20 ns cycle time (50 MHz max); pin-compatible; shares identical flag programming model and RJ package. | Lower maximum frequency reduces timing margin in high-speed designs but improves noise immunity and power efficiency. | Choose SN74ACT72221L20RJ when system clock stability or EMI constraints favor relaxed timing margins over peak throughput. |
Compared with IDT72221L15JI and SN74ACT72221L20RJ, SN74ACT72221L15RJ delivers optimal balance of speed (66.7 MHz), commercial-temperature qualification, and TI's long-term support roadmap-making it ideal for cost-sensitive, volume OEM designs where 15 ns latency is mandatory.
Availability
SN74ACT72221L15RJ is available at Aetrix Electronics and suitable for graphics subsystems, communication protocol stacks, industrial control interfaces, and test equipment data acquisition requiring stable component supply and guaranteed long-lifecycle sourcing.
Supply support for SN74ACT72221L15RJ 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 heritage.
The SN74ACT72221L15RJ belongs to TI's ACT-family synchronous FIFO product line, engineered for high-reliability data channel isolation between asynchronous digital subsystems in commercial and industrial applications.
FAQ
What is the exact memory organization of the SN74ACT72221L15RJ?
The SN74ACT72221L15RJ contains 1024 words of 9-bit synchronous FIFO memory, implemented with CMOS dual-port SRAM. This yields a total capacity of 9216 bits, structured to support byte-wide data plus parity or packet header information. The organization is fixed and not reconfigurable.
How does the SN74ACT72221L15RJ handle clock domain crossing between write and read paths?
The SN74ACT72221L15RJ uses edge-synchronized status flags: EF and PAE are registered to RCLK, while FF and PAF are registered to WCLK. This ensures metastability-free boundary detection. Internal pointers are updated synchronously within their respective clock domains, eliminating need for external synchronizers.
Can the programmable flag offsets in the SN74ACT72221L15RJ be changed dynamically during operation?
Yes-the SN74ACT72221L15RJ supports dynamic reprogramming of its four 8-bit flag offset registers (empty LSB/MSB, full LSB/MSB) via the WEN2/LD pin. A specific 4-cycle WCLK sequence writes new values, enabling runtime adaptation of almost-empty/almost-full thresholds without reset or configuration registers.
What is the function of the WEN2/LD pin on the SN74ACT72221L15RJ, and how is its mode selected?
The WEN2/LD pin on the SN74ACT72221L15RJ serves dual roles: as a second write-enable input or as a load-enable for flag offset registers. Its function is determined by its logic level during device reset (RS low): high configures dual-WEN mode; low configures LD mode for offset register access.
Is the SN74ACT72221L15RJ pin-compatible with other members of the SN74ACT722xxL family?
Yes-the SN74ACT72221L15RJ shares identical pinout, package (32-pin RJ), and interface signaling with SN74ACT72211L15RJ, SN74ACT72231L15RJ, and SN74ACT72241L15RJ. Differences are limited to memory depth (512/1024/2048/4096 words), which affects flag boundary calculations but not physical or electrical connectivity.
SN74ACT72221L15RJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- -
- Function:
- -
- Data Rate:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Bus Directional:
- -
- Expansion Type:
- -
- Programmable Flags Support:
- -
- Retransmit Capability:
- -
- FWFT Support:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ACT72221L15RJ FAQ
1.How can I place an order for SN74ACT72221L15RJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT72221L15RJ 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 SN74ACT72221L15RJ reliable?
The price and inventory of SN74ACT72221L15RJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT72221L15RJ is usually 5 days.
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For technical support, including SN74ACT72221L15RJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT72221L15RJ requirements.
6.How does Aetrix verify that SN74ACT72221L15RJ is sourced from the original manufacturer or authorized distributors?
All SN74ACT72221L15RJ 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 SN74ACT72221L15RJ meets industry standards.
7.What is the process for return or replacement of SN74ACT72221L15RJ?
All SN74ACT72221L15RJ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT72221L15RJ, 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 SN74ACT72221L15RJ part is unused and in its original packaging.
Return procedure for SN74ACT72221L15RJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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