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Texas Instruments SN74ACT72231L25RJ
- Part No.:
- SN74ACT72231L25RJ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- -
- Datasheet:
-
SN74ACT72231L25RJ.pdf
- Description:
- IC FIFO SYNC 2KX9 UNI-DIR
- Quantity:
- Payment:
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Inventory:2,447
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Product details
Overview
SN74ACT72231L25RJ from Texas Instruments is a 2048 × 9-bit synchronous dual-clock FIFO memory IC with independent read/write clocks, 15 ns cycle time, TTL-compatible inputs, and programmable almost-empty/almost-full flags. It implements first-in-first-out buffering in high-speed asynchronous data channel applications such as graphics rate buffers and communication system queues.
For engineers reviewing the SN74ACT72231L25RJ datasheet, SN74ACT72231L25RJ pinout, SN74ACT72231L25RJ application, or SN74ACT72231L25RJ equivalent, key selection criteria include its 2048-word depth, 9-bit data width with parity support, 32-pin RJ package, flag synchronization to respective clocks, and compatibility with IDT72231 family designs.
Technical Context
This device uses CMOS dual-port SRAM architecture with internal write and read address counters. It supports fully independent RCLK and WCLK operation-either asynchronous or coincident-and employs synchronous control at both input and output ports via dedicated enable signals (WEN1/WEN2/LD, REN1/REN2).
Flag logic includes EF synchronized to RCLK and FF synchronized to WCLK for boundary detection, plus PAE and PAF synchronized respectively to RCLK and WCLK with programmable offsets. Reset initializes pointers and loads default offset values (empty+7/full−7), and WEN2/LD function (second write enable vs. load control) is determined by its logic level during reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 2048 × 9-bit words - provides 18,432 bits 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, suitable for high-throughput inter-bus bridging. |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures robust operation across industrial-grade 5 V rails with ±5% tolerance. |
| Input Compatibility | TTL-compatible inputs - simplifies interface with legacy 5 V logic families without level-shifting. |
| Flag Synchronization | EF/PAE on RCLK edge; FF/PAF on WCLK edge - prevents metastability in asynchronous clock domain crossings. |
| Programmable Offsets | Empty+7 / Full−7 defaults - configurable via WEN2/LD-controlled register writes to tailor buffer watermark thresholds. |
| Operating Temperature | 0°C to 70°C - validated for commercial and industrial embedded systems with ambient thermal constraints. |
Pinout & Package
SN74ACT72231L25RJ is housed in a 32-pin plastic J-leaded chip carrier (RJ) package with standard pin layout per SCAS222 datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D8 | Data inputs | 9-bit parallel write data bus; accepts byte + parity or framing information on WCLK↑ when WEN1 active and FF high. |
| Q0–Q8 | Data outputs | 9-bit parallel read data bus; drives valid data on RCLK↑ when REN1/REN2 active and EF high; tri-stated when OE high. |
| WCLK, RCLK | Clock inputs | Independent write/read clocks; support asynchronous operation or single-clock mode when tied together. |
| WEN1, WEN2/LD | Write control | WEN1 is primary write enable; WEN2/LD serves dual role: second write enable (if held high at reset) or load control for offset registers (if low at reset). |
| REN1, REN2 | Read control | Both must be low to enable read on RCLK↑; allows robust read gating in multi-device configurations. |
| OE | Output enable | Active-low control for Q0–Q8 bus drivers; enables high-impedance state during bus sharing or idle periods. |
| EF, FF, PAE, PAF | Status flags | EF/FF indicate absolute empty/full states; PAE/PAF provide programmable near-boundary alerts synchronized to respective clocks. |
| RS | Reset input | Asynchronous reset that initializes pointers, clears output register, sets flags to known states (FF/PAF=H, EF/PAE=L), and loads default offsets. |
| VCC, GND | Power terminals | Single 5 V supply with dedicated ground; decoupling required per high-speed CMOS layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bit-width expandable architecture | Multiple SN74ACT72231L25RJ devices can be paralleled to increase data path width (e.g., 18-bit using two units), with composite flag generation required. |
| Programmable almost-empty/almost-full flags | Offset registers allow custom watermark thresholds beyond defaults (empty+7/full−7); configured via WEN2/LD and WCLK sequence without external logic. |
| Synchronous dual-clock FIFO operation | Guarantees deterministic timing: data written on WCLK↑ with WEN1 assertion, read on RCLK↑ with REN1/REN2 assertion-no handshake overhead. |
| Full TTL input compatibility | Accepts standard 5 V TTL voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling direct connection to legacy microcontrollers and bus controllers. |
| IDT72231 family compatibility | Pin- and function-compatible with IDT72231, allowing drop-in replacement in existing designs using that series' footprint and control protocol. |
Applications
| Graphics Rate Buffering | Communication System Queuing |
|---|---|
Use Scenario: Buffering pixel data between display controller and frame buffer with mismatched clock domains. IC Role / Device Role / Timing Role: Synchronous FIFO providing elastic storage to absorb timing skew between graphics pipeline stages. Use Value: Eliminates frame tearing or stutter by decoupling write (GPU-side) and read (display engine-side) clocks while maintaining 9-bit pixel+alpha or RGB+sync integrity. | Use Scenario: Storing packetized data in network interface controllers handling variable-rate Ethernet or serial protocols. IC Role / Device Role / Timing Role: Asynchronous data channel FIFO managing bursty ingress traffic before DMA transfer to host memory. Use Value: Prevents packet loss during link speed negotiation or interrupt latency spikes using full/empty flags and programmable watermarks for early DMA trigger. |
| Industrial Bus Bridging | Test Equipment Data Capture |
Use Scenario: Interfacing legacy ISA or VME bus peripherals with modern PCI Express-based host systems. IC Role / Device Role / Timing Role: Protocol-agnostic bridge FIFO absorbing clock domain differences and handshaking mismatches between buses. Use Value: Enables seamless integration without custom ASICs; 2048-word depth accommodates typical burst transfers while 9-bit width supports control/status sideband channels. | Use Scenario: Capturing high-speed sensor or waveform data in automated test equipment with real-time analysis constraints. IC Role / Device Role / Timing Role: First-stage acquisition buffer isolating ADC sampling clock from slower processing or storage subsystems. Use Value: Maintains sample fidelity during CPU interrupts or disk I/O stalls using EF/FF flags to prevent overflow/underflow and PAE/PAF to schedule pre-trigger capture windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72231L25JI | Same 2048 × 9 organization, 15 ns cycle time, and RJ package; identical pinout and flag behavior but manufactured by Integrated Device Technology. | Direct drop-in replacement in IDT-designed systems; same temperature range (0°C to 70°C) and electrical specs. | Select when sourcing from IDT-authorized channels or maintaining legacy IDT BOMs; no PCB changes required. |
| SN74ACT72231L20RJ | Same die and functionality but rated for 20 ns cycle time (50 MHz max), resulting in slightly relaxed timing margins and lower power consumption. | Suitable where 66.7 MHz operation is unnecessary; preferred in thermally constrained or cost-sensitive volume production. | Choose for reduced EMI or extended timing裕度 in noise-prone environments; verify tsk1/tsk2 compliance in high-frequency multi-clock systems. |
Compared with IDT72231L25JI and SN74ACT72231L20RJ, SN74ACT72231L25RJ delivers the highest guaranteed clock frequency (66.7 MHz) within the family while retaining full functional and mechanical compatibility-making it optimal for performance-critical FIFO buffering where maximum throughput is required.
Availability
SN74ACT72231L25RJ is available at Aetrix Electronics and suitable for graphics rate buffering, communication system queuing, and industrial bus bridging requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT72231L25RJ 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ACT72231L25RJ belongs to TI's ACT-family advanced CMOS FIFO product line, engineered specifically for high-speed, low-latency data buffering between asynchronous digital subsystems in commercial and industrial equipment.
FAQ
What is the memory capacity and data width of the SN74ACT72231L25RJ?
The SN74ACT72231L25RJ provides 2048 words of storage, each word being 9 bits wide-totaling 18,432 bits. This configuration supports byte-wide data transmission with an additional bit for parity or packet framing, making it ideal for applications requiring error detection or protocol overhead handling alongside payload data.
How does the SN74ACT72231L25RJ handle asynchronous clock domains between read and write operations?
The SN74ACT72231L25RJ natively supports asynchronous operation: WCLK and RCLK may run at different frequencies or phases. EF and FF flags are synchronized to RCLK and WCLK respectively, preventing metastability. The device guarantees safe data transfer without external handshaking logic, provided tsk1 and tsk2 timing constraints are met per the datasheet.
Can the programmable almost-empty and almost-full flags of the SN74ACT72231L25RJ be customized, and how?
Yes-the SN74ACT72231L25RJ allows customization of PAE and PAF thresholds via four 8-bit offset registers. When WEN2/LD is held low during reset, it becomes a load control signal; subsequent WCLK edges write LSB/MSB values for empty and full offsets. Default values are empty+7 and full−7, but user-defined values enable precise buffer management for application-specific latency or burst tolerance.
Is the SN74ACT72231L25RJ pin-compatible with other devices in the SN74ACT722xx family?
Yes-the SN74ACT72231L25RJ shares identical pinout, package (32-pin RJ), and control interface with SN74ACT72211L, SN74ACT72221L, and SN74ACT72241L. Differences lie solely in memory depth (512/1024/2048/4096 words); all use the same flag logic, timing model, and programming method, enabling scalable design reuse across capacity tiers.
What is the operating temperature range and supply voltage specification for the SN74ACT72231L25RJ?
The SN74ACT72231L25RJ is characterized for operation from 0°C to 70°C ambient temperature and requires a nominal 5 V supply with a recommended range of 4.5 V to 5.5 V. These specifications align with commercial and industrial-grade requirements, ensuring reliable performance in embedded systems without forced cooling or precision regulation.
SN74ACT72231L25RJ 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:
- -
SN74ACT72231L25RJ FAQ
1.How can I place an order for SN74ACT72231L25RJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT72231L25RJ 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 SN74ACT72231L25RJ reliable?
The price and inventory of SN74ACT72231L25RJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT72231L25RJ is usually 5 days.
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Once your SN74ACT72231L25RJ 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 SN74ACT72231L25RJ?
For technical support, including SN74ACT72231L25RJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT72231L25RJ requirements.
6.How does Aetrix verify that SN74ACT72231L25RJ is sourced from the original manufacturer or authorized distributors?
All SN74ACT72231L25RJ 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 SN74ACT72231L25RJ meets industry standards.
7.What is the process for return or replacement of SN74ACT72231L25RJ?
All SN74ACT72231L25RJ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT72231L25RJ, 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 SN74ACT72231L25RJ part is unused and in its original packaging.
Return procedure for SN74ACT72231L25RJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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