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Texas Instruments SN74ACT7205L50RJ
- Part No.:
- SN74ACT7205L50RJ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- -
- Datasheet:
-
SN74ACT7205L50RJ.pdf
- Description:
- IC FIFO ASYNC 8KX9 50NS
- Quantity:
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Product details
Overview
SN74ACT7205L50RJ from Texas Instruments is a 8192 × 9-bit asynchronous dual-port FIFO memory IC with independent read/write ports, 15 ns access time, 40 MHz operation, and TTL-compatible inputs. It implements first-in-first-out buffering for data rate translation between asynchronous buses in communication systems and data-acquisition interfaces.
For engineers reviewing the SN74ACT7205L50RJ datasheet, SN74ACT7205L50RJ pinout, SN74ACT7205L50RJ application, or SN74ACT7205L50RJ equivalent, key selection criteria include depth-expansion capability, retransmit functionality, empty/full/half-full flag outputs, and 32-pin PLCC (RJ) package compatibility with legacy industrial control and test equipment designs.
Technical Context
This device integrates dual-port SRAM with internal write and read address counters, enabling true asynchronous or coincident read/write operations without external sequencing logic. Its status-flag architecture (EF, FF, XO/HF) provides real-time buffer occupancy monitoring for flow control in bidirectional data channels.
The SN74ACT7205L50RJ supports bit-width expansion via parallel connection and word-depth expansion via daisy-chained XI/XO interfaces, with FL/RT input enabling either first-load initialization or retransmit mode depending on expansion configuration. All timing parameters are specified over 0°C to 70°C at VCC = 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8192 × 9-bit FIFO - provides 73,728 bits of first-in-first-out storage for byte-plus-parity or packet-framing data paths. |
| Data Access Time | 15 ns - enables high-speed interface bridging between microcontrollers and ADCs/DACs operating up to 40 MHz. |
| Read/Write Frequency | Up to 40 MHz - supports sustained burst transfers without cycle-stretching in real-time data acquisition pipelines. |
| Status Flags | Empty (EF), Full (FF), Half-Full (XO/HF) - hardware-asserted open-drain outputs for autonomous flow control without CPU polling. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including industrial instrumentation and communications infrastructure. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic families and legacy backplane power domains. |
| Input Compatibility | TTL-compatible inputs - eliminates level-shifting requirements when interfacing with 74ACT, 74LS, or microcontroller GPIOs. |
Pinout & Package
SN74ACT7205L50RJ is housed in a 32-pin plastic J-leaded chip-carrier (PLCC) package (RJ suffix), with 0.050-inch lead pitch and surface-mount footprint. Pin 1 is marked by a corner notch; the package is lead-free and RoHS-compliant per TI's 1995 specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D8 | Data inputs | 9-bit parallel write data bus; latched on falling edge of W when FF = high. |
| Q0–Q8 | Data outputs | 9-bit parallel read data bus; driven low-impedance on falling edge of R when EF = high. |
| W | Write-enable input | Falling-edge-triggered write strobe; inhibited when FF = low to prevent overflow. |
| R | Read-enable input | Falling-edge-triggered read strobe; inhibited when EF = low to prevent underflow. |
| RS | Reset input | Active-low synchronous reset that initializes both read/write pointers to location zero and asserts EF/FF states. |
| FL/RT | First-load/retransmit control | Configurable function: ground = first-device depth-expansion mode; high = retransmit enable for pointer reset. |
| XI | Expansion-in | Depth-expansion chain input; tied to ground for standalone operation or connected to XO/HF of prior device. |
| XO/HF | Expansion-out / half-full flag | Dual-function: daisy-chain output in depth expansion; half-full status indicator when XI = ground. |
| EF | Empty-flag output | Open-drain active-low signal indicating read pointer = write pointer; used for automatic-read handshaking. |
| FF | Full-flag output | Open-drain active-low signal indicating (write pointer + 1) mod 8192 = read pointer; used for automatic-write handshaking. |
| VCC, GND | Power supply | Single 5 V supply with dedicated ground plane; decoupling required within 10 mm of pins 16 and 32 per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Read/Write | Independent clockless operation allows seamless bridging between buses with mismatched timing domains (e.g., UART ↔ microcontroller). |
| Retransmit Capability | FL/RT pulse resets read pointer to location zero without affecting write pointer-enables packet retransmission in protocol stacks. |
| Depth Expansion Logic | Hardware-supported daisy-chaining via XI/XO/HF enables scalable FIFO depth beyond 8192 words without external address management. |
| Automatic Read/Write Mode | EF/FF flags drive self-timed cycles: holding R low during EF=low auto-reads last word; holding W low during FF=low auto-writes new word. |
| 9-Bit Data Path | Supports 8-bit data + parity or 8-bit data + framing bit-meets legacy industrial serial protocols and MIL-STD-1553B auxiliary channel needs. |
Applications
| ADC Data Buffering | UART Rate Matching |
|---|---|
|
Use Scenario: High-speed analog-to-digital converter streams samples into an FPGA at 20 MSPS, while a slower ARM processor reads batches at 1 MSPS. IC Role / Device Role / Timing Role: SN74ACT7205L50RJ acts as a decoupling FIFO, absorbing burst writes and smoothing read demand across clock domains. Use Value: Eliminates sample loss during processor interrupt latency; 8192-word depth accommodates worst-case 8 ms backlog at 20 MSPS. |
Use Scenario: A microcontroller transmits ASCII commands over RS-232 at 115.2 kbps to a sensor module running at 9600 bps. IC Role / Device Role / Timing Role: SN74ACT7205L50RJ buffers outgoing command packets and incoming response frames between mismatched UART clocks. Use Value: Prevents TX underrun and RX overrun; EF/FF flags enable hardware handshaking without software flow control overhead. |
| Legacy Bus Interface | Test Equipment Data Capture |
|
Use Scenario: Integrating modern PCIe-based DAQ into a 1990s-era VMEbus chassis requiring 5 V TTL signaling and fixed 32-pin PLCC footprints. IC Role / Device Role / Timing Role: SN74ACT7205L50RJ serves as a protocol-transparent bridge, matching VMEbus burst timing to PCIe DMA bursts. Use Value: Maintains mechanical and electrical compatibility with existing backplane layouts; RJ package fits legacy socket tooling. |
Use Scenario: Automated test system captures transient waveforms from oscilloscope modules and forwards them to host PC via GPIB. IC Role / Device Role / Timing Role: SN74ACT7205L50RJ stores waveform segments during high-speed acquisition, then releases them synchronously to GPIB controller. Use Value: Enables gap-free capture at 50 MS/s for >160 µs duration; half-full flag triggers early host fetch to minimize dead time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7205L25JI | Same 8192 × 9 organization, but 25 ns access time and 28-pin SOIC package; requires PCB redesign for footprint. | Lacks retransmit function and half-full flag; limited to basic FIFO use cases without packet retransmission. | Choose when lower cost and smaller footprint outweigh need for retransmit and PLCC compatibility. |
| SN74ACT7205L50DV | Identical electrical specs and functionality, but in 28-pin SOIC (DV) package instead of 32-pin PLCC (RJ). | SOIC version suits new designs with space constraints; not mechanically interchangeable with RJ socketed systems. | Prefer for new board layouts where surface-mount density matters more than legacy socket reuse. |
Compared with IDT7205L25JI and SN74ACT7205L50DV, the SN74ACT7205L50RJ uniquely combines 15 ns access, retransmit capability, half-full flag, and 32-pin PLCC packaging-making it the only option for upgrading legacy 5 V systems requiring drop-in replacement with enhanced flow control.
Availability
SN74ACT7205L50RJ is available at Aetrix Electronics and suitable for industrial instrumentation, legacy test equipment upgrades, and aerospace ground-support systems requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ACT7205L50RJ 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ACT7205L50RJ belongs to TI's ACT-family advanced CMOS logic line, designed specifically for high-speed, low-power 5 V system interfacing with robust noise immunity and TTL compatibility.
FAQ
What is the memory depth and width of the SN74ACT7205L50RJ?
The SN74ACT7205L50RJ provides 8192 words of storage, each 9 bits wide (8192 × 9). This configuration supports byte-wide data plus parity or framing bits, and is explicitly confirmed in the SCAS226A datasheet functional description and logic symbol diagrams for the SN74ACT7205L family.
Does the SN74ACT7205L50RJ support retransmission of previously read data?
Yes, the SN74ACT7205L50RJ supports retransmission via its FL/RT input. When FL/RT is pulsed low while R and W are high, the internal read pointer resets to location zero without altering the write pointer-enabling repeat reads of buffered data, as documented in the RESET AND RETRANSMIT FUNCTION TABLE.
What package type does the SN74ACT7205L50RJ use, and how many pins does it have?
The SN74ACT7205L50RJ uses a 32-pin plastic J-leaded chip-carrier (PLCC) package, designated by the "RJ" suffix. The pinout diagram on page 1 of SCAS226A confirms this configuration, showing pins numbered 1 through 32 in clockwise order with a corner notch marking pin 1.
Can multiple SN74ACT7205L50RJ devices be cascaded to increase FIFO depth?
Yes, the SN74ACT7205L50RJ supports hardware-assisted depth expansion using the XI (expansion-in) and XO/HF (expansion-out) pins. Devices are daisy-chained with XO/HF of one connected to XI of the next, and FL/RT grounded on the first device-enabling scalable FIFO depth beyond 8192 words as described in Figure 15 and the APPLICATION INFORMATION section.
What are the key timing specifications for read and write operations on the SN74ACT7205L50RJ?
The SN74ACT7205L50RJ guarantees 15 ns data access time (ta), 25 ns read/write cycle times (tc(R)/tc(W)), and 40 MHz maximum operation. These values are confirmed in the timing requirements table (page 9) and switching characteristics table (page 10) of SCAS226A, with all parameters validated over 0°C to 70°C at VCC = 4.5–5.5 V.
SN74ACT7205L50RJ 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:
- -
SN74ACT7205L50RJ FAQ
1.How can I place an order for SN74ACT7205L50RJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT7205L50RJ 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 SN74ACT7205L50RJ is sourced from the original manufacturer or authorized distributors?
All SN74ACT7205L50RJ 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 SN74ACT7205L50RJ meets industry standards.
7.What is the process for return or replacement of SN74ACT7205L50RJ?
All SN74ACT7205L50RJ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7205L50RJ, 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 SN74ACT7205L50RJ part is unused and in its original packaging.
Return procedure for SN74ACT7205L50RJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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