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Renesas 7281L12PAG
- Part No.:
- 7281L12PAG
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
7281L12PAG.pdf
- Description:
- IC FIFO ASYNC 512X9X2 56TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
7281L12PAG from Integrated Device Technology (IDT) is a CMOS dual asynchronous FIFO memory IC with two independent 512 × 9-bit data buffers, 12 ns access time, 5 V supply, and TSSOP-56 package. It supports simultaneous read/write operations, auto-retransmit, and status flags (Empty, Full, Half-Full), enabling robust data buffering in rate-mismatched communication interfaces.
For engineers reviewing the 7281L12PAG datasheet, 7281L12PAG pinout, 7281L12PAG application, or 7281L12PAG equivalent, this device serves as a high-speed, low-power dual FIFO for bidirectional data flow-through, width/depth expansion, and bus-matching in industrial embedded systems requiring deterministic latency and flag-controlled handshaking.
Technical Context
The 7281L12PAG implements two fully independent FIFO channels (A and B), each with dedicated 9-bit data I/O, control lines (W/R/RS/FL-RT/XI), and status outputs (EF/FF/XO-HF). Its ring-pointer architecture eliminates external address management and enables true asynchronous operation between clock domains.
All timing parameters-including tA = 12 ns, tRC = 20 ns, tWC = 20 ns, and tRT = 12 ns-are specified over commercial temperature range (0°C to +70°C) at VCC = 5 V ±10%. The device uses high-performance CMOS technology and supports data flow-through modes where a single write can be immediately followed by a read (or vice versa) without intermediate reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth per FIFO | 512 words - matches IDT7201 specification; defines maximum burst-length buffering before Full/Empty flags assert. |
| Data Width | 9 bits - supports 8-bit data + 1 parity bit for error-checked serial/parallel communications. |
| Access Time (tA) | 12 ns - guarantees minimum delay from write/read enable edge to valid output or stable internal storage; critical for 50 MHz system timing. |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V TTL/CMOS logic families; no level-shifting required. |
| Operating Temperature | 0°C to +70°C - commercial grade; validated for use in non-extended-environment industrial control and test equipment. |
| Power Consumption | Active: ≤125 mA (625 mW max); Power-down: ≤15 mA (75 mW max) - enables low-idle-power system states without full shutdown. |
| Status Flags | Empty (EF), Full (FF), Half-Full (HF) - hardware-signaled handshaking enables zero-software-overhead flow control in real-time systems. |
Pinout & Package
TSSOP-56 (SO56-2) package with 0.5 mm pitch; thermally enhanced for industrial ambient operation and compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA0–DA8 / DB0–DB8 | Data Inputs (A/B) | 9-bit parallel input buses for independent FIFO A and B; support parity injection or extended data paths. |
| QA0–QA8 / QB0–QB8 | Data Outputs (A/B) | Three-state outputs synchronized to read enable; high-impedance when R = HIGH prevents bus contention. |
| WA / WB | Write Enable (A/B) | Falling-edge-triggered write strobes; inhibit writes when FF = LOW to prevent overflow. |
| RA / RB | Read Enable (A/B) | Falling-edge-triggered read strobes; inhibit reads when EF = LOW to prevent underflow. |
| FFA / FFB | Full Flag Output (A/B) | Active-low open-drain outputs indicating FIFO is full; used directly for write-gating logic. |
| EFA / EFB | Empty Flag Output (A/B) | Active-low open-drain outputs indicating FIFO is empty; used directly for read-gating logic. |
| XOA/HFA / XOB/HFB | Expansion Out / Half-Full Flag (A/B) | Dual-function pins: HF in single-device mode; XO daisy-chain signal in depth expansion mode. |
| FLA/RTA / FLB/RTB | First Load / Retransmit (A/B) | Dual-function inputs: RT for pointer reset in single mode; FL for depth-expansion master selection. |
| XIA / XIB | Expansion In (A/B) | Grounded in single-device mode; tied to XO of prior device in depth expansion chains. |
| RSA / RSB | Reset (A/B) | Synchronous reset of both read/write pointers to location zero; required before first write after power-up. |
| VCC / GND | Power Supply | Single 5 V supply with dedicated VCC/GND pairs per side to minimize noise coupling between FIFOs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent FIFO channels | Enables concurrent buffering of two data streams (e.g., TX/RX in bidirectional links) without software arbitration or shared resources. |
| Retransmit (RT) capability | Hardware-initiated read pointer reset allows repeat transmission of buffered data-critical for protocol retries without CPU intervention. |
| Asynchronous read/write clocks | Eliminates need for clock domain synchronization logic; supports independent WCLK/RCLK frequencies up to 50 MHz. |
| Width and depth expansion support | Native 18-bit width via dual-FIFO parallel connection; unlimited depth via daisy-chained XI/XO with composite flag logic. |
| Flow-through operation | Valid data appears on Q-bus within (tWEF + tA) = ≤24 ns after first write pulse-enables pipelined streaming with minimal latency. |
Applications
| Industrial Serial Communication Bridge | PCI-to-ISA Bus Matching Interface |
|---|---|
Use Scenario: Bridging legacy ISA peripherals to modern PCI-based controllers with mismatched data rates and handshaking protocols. IC Role / Device Role / Timing Role: Dual FIFO acts as decoupling buffer: one channel absorbs variable-rate ISA writes, the other feeds steady-rate PCI reads-managed entirely by EF/FF flags. Use Value: Eliminates CPU polling or DMA setup overhead; guarantees lossless data transfer across asynchronous domains using only hardware flags. |
Use Scenario: Adapting 8-bit ISA data bursts to 32-bit PCI transfers while preserving byte ordering and timing integrity. IC Role / Device Role / Timing Role: Width-expanded 18-bit FIFO (two 7281L12PAGs in parallel) buffers partial-word writes and aligns them into full PCI-aligned transactions. Use Value: Enables seamless word-width conversion without glue logic; leverages built-in Half-Full flag to trigger burst coalescing before PCI commit. |
| Real-Time Data Acquisition Front-End | Modem Protocol Stack Buffering |
Use Scenario: Capturing high-speed analog-to-digital samples from multiple sensors into a microcontroller with limited DMA bandwidth. IC Role / Device Role / Timing Role: One FIFO stores incoming ADC data; second FIFO holds processed results for host read-both managed by autonomous flag signaling. Use Value: Offloads real-time sampling from CPU; ensures no sample loss during interrupt service or context switches due to hardware flow control. |
Use Scenario: Supporting HDLC or V.42bis error-correction protocols requiring retransmission of corrupted frames. IC Role / Device Role / Timing Role: 7281L12PAG stores transmitted frame; RT pin triggers immediate replay upon NACK detection-no firmware delay. Use Value: Achieves sub-microsecond retransmit latency; maintains protocol timing compliance without CPU cycle consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual asynchronous FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7281L15PAG | 15 ns access time (vs. 12 ns); otherwise identical pinout, function, and timing structure. | Suitable for lower-speed designs where 12 ns margin is unnecessary; reduces timing closure effort in 25–40 MHz systems. | Select when system clock margins allow relaxed tA; same PCB layout and firmware interface. |
| ON Semiconductor MC100E131FN | ECL-based dual FIFO; 3.3 V supply; faster 3.5 ns access but requires level translation and higher power. | Used in ultra-high-speed telecom backplanes; incompatible voltage and logic family-requires redesign of surrounding circuitry. | Choose only for sub-5 ns latency-critical ECL systems; not drop-in or functionally interchangeable. |
Compared with IDT7281L15PAG and MC100E131FN, the 7281L12PAG delivers optimal balance of speed (12 ns), 5 V compatibility, and low-power CMOS operation-making it the preferred choice for cost-sensitive, mixed-signal industrial designs requiring proven reliability and flag-driven simplicity.
Availability
7281L12PAG is available at Aetrix Electronics and suitable for industrial serial bridges, bus-matching interfaces, real-time data acquisition front-ends, and modem protocol stack buffering requiring stable component supply and long-term production continuity.
Supply support for 7281L12PAG 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
Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. IDT pioneered high-performance FIFO and clock architectures for communications infrastructure.
The IDT7280–7285 family was designed specifically for deterministic, low-latency data buffering in asynchronous multi-processor and rate-adaptation systems-targeting industrial control, test equipment, and legacy bus interconnect applications.
FAQ
What is the exact memory capacity of the 7281L12PAG?
The 7281L12PAG contains two independent 512 × 9-bit FIFO memories-one per channel-providing 4,608 bits (576 bytes) total storage. This matches the IDT7201 specification and is confirmed in the device ordering code "7281" and datasheet Section 1, "DUAL 512 x 9".
Does the 7281L12PAG support industrial temperature range?
No-the 7281L12PAG is rated for commercial temperature range only (0°C to +70°C), as indicated by the "C" suffix omission and confirmed in the Ordering Information table (page 12) and Recommended DC Operating Conditions (page 2). Industrial variants exist but carry "I" suffix (e.g., 7281L12PAIG).
Can the 7281L12PAG operate with different clock frequencies on read and write sides?
Yes-the 7281L12PAG is fully asynchronous: RA and WA accept independent clock signals with no phase or frequency relationship required. AC Electrical Characteristics (page 3) specify tRC and tWC minima separately, confirming true dual-clock domain operation up to 50 MHz per side.
How does the Retransmit (RT) function work on the 7281L12PAG?
When FLA/RTA is configured as RT (XI grounded), pulsing RTA LOW resets only the read pointer to location zero-leaving the write pointer and stored data unchanged. This enables immediate replay of buffered data, as defined in Signal Descriptions (page 4) and Table 1 (page 9).
Is the 7281L12PAG pin-compatible with other devices in the IDT728x family?
Yes-all IDT7280–7285 variants share identical TSSOP-56 pinout, signal naming, and functional mapping. Only memory depth (256–8192 words) and speed grade (12/15 ns) differ; the 7281L12PAG may be substituted with 7280L12PAG or 7282L12PAG on the same PCB if depth requirements permit.
7281L12PAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 9K (512 x 9 x 2)
- Function:
- Asynchronous
- Data Rate:
- 50MHz
- Access Time:
- 12ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 125mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- No
- Retransmit Capability:
- Yes
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
7281L12PAG FAQ
1.How can I place an order for 7281L12PAG through Aetrix?
Please submit a Request for Quotation (RFQ) for 7281L12PAG 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 7281L12PAG reliable?
The price and inventory of 7281L12PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7281L12PAG is usually 5 days.
3.What payment methods are accepted for 7281L12PAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7281L12PAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7281L12PAG?
7281L12PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7281L12PAG 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 7281L12PAG?
For technical support, including 7281L12PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7281L12PAG requirements.
6.How does Aetrix verify that 7281L12PAG is sourced from the original manufacturer or authorized distributors?
All 7281L12PAG 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 7281L12PAG meets industry standards.
7.What is the process for return or replacement of 7281L12PAG?
All 7281L12PAG units undergo pre-shipment inspection (PSI). If there is an issue with 7281L12PAG, 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 7281L12PAG part is unused and in its original packaging.
Return procedure for 7281L12PAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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