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Texas Instruments SN74ACT72241L25RJ
- Part No.:
- SN74ACT72241L25RJ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- -
- Datasheet:
-
SN74ACT72241L25RJ.pdf
- Description:
- IC FIFO SYNC 4KX9
- Quantity:
- Payment:
- Shipping:
Inventory:4,441
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Product details
Overview
SN74ACT72241L25RJ from Texas Instruments is a 4096 × 9-bit synchronous FIFO memory IC with dual-clock architecture, 15 ns write/read cycle time, TTL-compatible inputs, and programmable almost-empty/almost-full flags. It serves as a high-speed data channel between asynchronous buses in communication systems and graphics rate buffers.
For engineers reviewing the SN74ACT72241L25RJ datasheet, SN74ACT72241L25RJ pinout, SN74ACT72241L25RJ application, or SN74ACT72241L25RJ equivalent, key selection criteria include its 4096-word depth, 9-bit parallel interface, RJ package compatibility, flag synchronization to respective clocks, and support for bit-width expansion.
Technical Context
This device implements a CMOS dual-port SRAM core with independent synchronous write and read address counters, enabling true first-in, first-out operation. Write operations are controlled by WCLK, WEN1, and WEN2/LD; reads are controlled by RCLK, REN1, and REN2 - all fully independent and configurable for asynchronous or coincident clocking.
The FIFO includes synchronized status flags (EF/FF) and programmable offset registers for PAE/PAF, initialized to empty+7 and full–7 respectively. Flag behavior is strictly determined by pointer arithmetic and register values, with EF synchronized to RCLK and FF/PAF synchronized to WCLK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth | 4096 × 9-bit words - provides 36,864 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, supporting high-throughput inter-bus bridging. |
| Flag Synchronization | EF and PAE synchronized to RCLK; FF and PAF synchronized to WCLK - ensures deterministic timing boundaries for control logic. |
| Programmable Offsets | Four 8-bit registers (empty LSB/MSB, full LSB/MSB) - allow custom almost-empty/almost-full thresholds beyond default ±7. |
| Input Compatibility | TTL-compatible inputs - interfaces directly with legacy 5 V logic without level-shifting circuitry. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Supply Voltage | 4.5 V to 5.5 V - robust against nominal 5 V rail variation; supports stable operation across standard logic rails. |
Pinout & Package
SN74ACT72241L25RJ is housed in a 32-pin plastic J-leaded chip carrier (RJ) package, surface-mount compatible with standard reflow profiles and suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D8 | Data Inputs | 9-bit parallel input bus accepting data on WCLK rising edge when WEN1 and WEN2/LD are asserted and FF = high. |
| Q0–Q8 | Data Outputs | 9-bit parallel output bus driving valid data on RCLK rising edge when REN1/REN2 low and EF = high; tri-stated when OE = high. |
| WCLK, RCLK | Clock Inputs | Independent write and read clocks - may operate asynchronously or tied for single-clock mode; each controls its own pointer increment. |
| WEN1, WEN2/LD | Write Control | WEN1 is primary write enable; WEN2/LD is dual-function - high at reset enables second write enable, low enables flag offset register load. |
| REN1, REN2 | Read Enable | Both must be low to permit read operation on RCLK rising edge; prevents spurious reads during control transitions. |
| OE | Output Enable | Active-low control for Q0–Q8 bus - places outputs in high-impedance state when high, enabling shared bus architectures. |
| EF, FF | Status Flags | EF = low indicates FIFO empty (read inhibited); FF = low indicates FIFO full (write inhibited); both synchronized to respective clocks. |
| PAE, PAF | Programmable Flags | PAE = low when unread words ≤ programmed empty threshold; PAF = low when unread words ≥ (4096 – programmed full threshold). |
| RS | Reset Input | Asynchronous active-low reset - initializes pointers, clears output register, sets EF/PAE = low and FF/PAF = high, loads default offsets. |
Key Features
| Feature | Design Value |
|---|---|
| Bit-width expandable | Multiple SN74ACT72241L25RJ devices can be cascaded to increase data path width beyond 9 bits while maintaining FIFO integrity. |
| Programmable almost-empty/full flags | Configurable thresholds via four 8-bit offset registers - enables precise buffer management for variable-rate data streams. |
| Synchronous dual-clock architecture | Independent WCLK and RCLK domains eliminate metastability risk and support true asynchronous bus bridging without external handshaking. |
| Reset-synchronized flag initialization | On power-up reset, EF/PAE go low and FF/PAF go high, ensuring deterministic startup state before first write or read. |
| TTL-compatible I/O | Direct interface with 5 V TTL and CMOS logic families - eliminates need for level translators in mixed-technology systems. |
Applications
| Graphics Data Rate Buffering | High-Speed Communication Queuing |
|---|---|
|
Use Scenario: Buffering pixel data between display controller and video DAC operating at mismatched clock rates. IC Role / Device Role / Timing Role: Synchronous FIFO providing elastic storage to absorb timing skew and prevent frame tearing or underflow. Use Value: 4096 × 9-bit depth accommodates multiple scan lines; 15 ns cycle time supports >66 MHz pixel clocks. |
Use Scenario: Storing packetized data between UART-based peripherals and a high-speed processor bus. IC Role / Device Role / Timing Role: Asynchronous bridge FIFO decoupling serial receive/transmit logic from burst-mode CPU access. Use Value: Programmable PAE/PAF flags enable adaptive interrupt generation before overflow/underflow, reducing CPU polling overhead. |
| Industrial Bus Protocol Translation | Real-Time Signal Processing Pipeline |
|
Use Scenario: Interfacing Modbus RTU master with a CAN FD controller requiring byte-aligned framing. IC Role / Device Role / Timing Role: 9-bit-wide FIFO handling 8-bit data + parity or protocol header bits across isolated clock domains. Use Value: TTL-compatible inputs simplify connection to legacy RS-485 transceivers; RJ package supports compact industrial PCB layout. |
Use Scenario: Streaming sensor samples from ADC to DSP core with variable processing latency. IC Role / Device Role / Timing Role: Elastic buffer absorbing jitter between fixed-rate sampling clock and bursty DMA transfers. Use Value: Independent WCLK/RCLK domains ensure deterministic sample capture and retrieval timing; EF/FF flags prevent data loss during bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72241L25J | Same 4096 × 9 organization, 15 ns timing, and RJ package; identical pinout and flag functionality per IDT datasheet SCDS052A. | Drop-in replacement with identical timing and electrical specs; validated for use in TI-design reference circuits. | Select IDT72241L25J when sourcing from IDT-authorized channels or when cross-qualifying for multi-source supply chain resilience. |
| SN74ACT72241L20RJ | Same die and functionality but rated for 20 ns cycle time (50 MHz max), resulting in higher propagation delays (e.g., ta ≤ 12 ns vs. 10 ns). | Lower maximum clock frequency reduces throughput margin; suitable where 50 MHz operation suffices and cost optimization is prioritized. | Choose SN74ACT72241L20RJ only if system timing budget allows 20 ns minimum cycle time and lower speed meets functional requirements. |
Compared with IDT72241L25J, SN74ACT72241L25RJ offers identical performance and pin compatibility but different manufacturer qualification; compared with SN74ACT72241L20RJ, it delivers 5 ns faster cycle time and tighter timing margins for demanding high-speed buffering.
Availability
SN74ACT72241L25RJ is available at Aetrix Electronics and suitable for graphics subsystems, industrial protocol gateways, and real-time signal processing pipelines requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT72241L25RJ 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 heritage in high-reliability timing and interface ICs.
The SN74ACT72241L25RJ belongs to TI's ACT-family synchronous FIFO product line, designed specifically for high-speed, low-latency data buffering between asynchronous digital subsystems in commercial and industrial equipment.
FAQ
What is the memory organization of the SN74ACT72241L25RJ?
The SN74ACT72241L25RJ is organized as 4096 words × 9 bits, delivering 36,864 bits of dual-port SRAM-based FIFO storage. This configuration supports 8-bit data plus parity or protocol framing bits, and is explicitly confirmed in the SCAS222 datasheet revision June 1993 under "Organization".
Does the SN74ACT72241L25RJ support asynchronous clock operation?
Yes, the SN74ACT72241L25RJ supports fully asynchronous operation: WCLK and RCLK may run at independent frequencies and phases. The device uses separate internal pointers and clock-synchronized flags (EF/PAE to RCLK; FF/PAF to WCLK) to guarantee safe concurrent read/write access without external handshaking.
How are the programmable almost-empty and almost-full flags configured on the SN74ACT72241L25RJ?
The SN74ACT72241L25RJ uses four 8-bit offset registers (empty LSB/MSB, full LSB/MSB) loaded via WCLK edges when WEN2/LD is held low during reset. Default values are empty+7 and full–7. Configuration requires sequential writes: first WCLK edge → empty LSB, second → empty MSB, third → full LSB, fourth → full MSB.
What is the function of the WEN2/LD pin on the SN74ACT72241L25RJ?
WEN2/LD is a dual-function pin whose role is determined at reset: if held high during RS assertion, it acts as a second write-enable (WEN2); if held low, it becomes the load (LD) signal for programming flag offset registers. This configuration is latched on RS deassertion and cannot be changed dynamically.
Is the SN74ACT72241L25RJ pin-compatible with IDT72241L25J?
Yes, the SN74ACT72241L25RJ is pin-compatible with IDT72241L25J: identical 32-pin RJ footprint, matching pin functions (D0–D8, Q0–Q8, WCLK, RCLK, EF, FF, etc.), and equivalent timing and electrical specifications per SCDS052A and SCAS222 datasheets - enabling direct substitution in existing designs.
SN74ACT72241L25RJ 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:
- -
SN74ACT72241L25RJ FAQ
1.How can I place an order for SN74ACT72241L25RJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT72241L25RJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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6.How does Aetrix verify that SN74ACT72241L25RJ is sourced from the original manufacturer or authorized distributors?
All SN74ACT72241L25RJ 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 SN74ACT72241L25RJ meets industry standards.
7.What is the process for return or replacement of SN74ACT72241L25RJ?
All SN74ACT72241L25RJ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT72241L25RJ, 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 SN74ACT72241L25RJ part is unused and in its original packaging.
Return procedure for SN74ACT72241L25RJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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