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Renesas 7201LA12SOG8
- Part No.:
- 7201LA12SOG8
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 28-SOIC (0.345", 8.77mm Width)
- Datasheet:
-
7201LA12SOG8.pdf
- Description:
- IC FIFO ASYNC 512X9 12NS 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
7201LA12SOG8 from Renesas Electronics (formerly IDT) is a 512 × 9-bit asynchronous CMOS FIFO memory IC used for rate buffering and data synchronization between mismatched clock domains or bus protocols. It features 12 ns access time, ultra-low active power (440 mW max), full/half-full/empty status flags, and auto-retransmit capability. It is deployed in industrial communications interfaces requiring deterministic latency and overflow/underflow protection.
For engineers reviewing the 7201LA12SOG8 datasheet, 7201LA12SOG8 pinout, 7201LA12SOG8 application, or 7201LA12SOG8 equivalent, key selection criteria include its 512-word depth, 9-bit data width with parity support, 5 V single-supply operation, TSSOP-28 package, and compatibility with depth/width expansion architectures in legacy embedded systems.
Technical Context
The 7201LA12SOG8 implements a dual-port ring-buffer architecture with independent read/write pointers managed entirely internally-no external address lines required. It supports asynchronous, simultaneous read and write operations with dedicated W (write enable) and R (read enable) control inputs, and uses EF/FF/HF flags to manage boundary conditions without software intervention.
Its retransmit (RT) function resets the read pointer to location zero on a low pulse while preserving the write pointer, enabling repeat transmission of buffered data. In single-device mode (XI grounded), XO/HF serves as a half-full flag; in depth expansion mode (XI tied to prior XO), it acts as a daisy-chain signal to cascade multiple FIFOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 512 × 9 bits - supports up to 512 words of 9-bit data, with D0–D8 accommodating 8 data + 1 parity bit for error-checked serial links. |
| Access Time (tA) | 12 ns - enables reliable operation at up to 50 MHz shift frequency in commercial/industrial temperature ranges. |
| Supply Voltage | 4.5 V to 5.5 V - single 5 V rail compatible with TTL/CMOS logic families and legacy industrial power supplies. |
| Power Consumption | Active: ≤440 mW (80 mA @ 5 V); Power-down: ≤28 mW (5 mA) - reduces thermal load in dense PCB layouts. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and motor control systems. |
| Status Flags | EF (Empty), FF (Full), XO/HF (Half-Full or Expansion Out) - hardware-level flow control eliminates CPU polling overhead. |
| Retransmit Function | RT input pulses LOW to reset read pointer - enables deterministic retransmission in protocol stacks like HDLC or custom packetized UART interfaces. |
Pinout & Package
7201LA12SOG8 is housed in a 28-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, and RoHS-compliant green finish (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| W | Write Enable Input | Falling-edge-triggered write strobe; initiates storage of D0–D8 into next sequential location if FF = HIGH. |
| R | Read Enable Input | Falling-edge-triggered read strobe; outputs Q0–Q8 from current read pointer location if EF = HIGH. |
| D0–D8 | Data Inputs | 9-bit parallel input bus; supports parity bit placement for error detection in serial communication buffers. |
| Q0–Q8 | Data Outputs | 3-state outputs enabled only during active read cycle (R = LOW); high-impedance otherwise. |
| EF, FF, XO/HF | Status Flag Outputs | Open-drain or push-pull (per config); EF = LOW when empty, FF = LOW when full, XO/HF = LOW when half-full (single mode) or expansion pulse (daisy-chain mode). |
| RS | Reset Input | Active-LOW synchronous reset; forces both read/write pointers to location zero and sets EF = LOW, FF = HIGH, HF = HIGH. |
| FL/RT | First Load / Retransmit Input | In single mode: RT - LOW pulse resets read pointer; in depth expansion: FL - LOW designates first device in chain. |
| XI | Expansion In Input | Grounded for single-device operation; connected to XO of prior device in depth expansion to enable cascading. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous dual-port architecture | Enables independent, concurrent read/write without shared clock-ideal for bridging UART-to-DSP or microcontroller-to-FPGA data paths. |
| Hardware flow control flags (EF/FF/HF) | Eliminates need for software polling or interrupt-driven status checking, reducing CPU overhead in real-time systems. |
| Auto-retransmit (RT) capability | Allows repeat transmission of buffered data without reloading-critical for HDLC, SDLC, or proprietary packet retransmission protocols. |
| Expandable depth and width | Supports unlimited word-depth expansion via XI/XO daisy-chaining and bit-width expansion by paralleling multiple devices with shared control lines. |
| 9-bit data path with parity option | Permits use of D8/Q8 as parity bit for error detection in industrial serial links (e.g., RS-485 fieldbus gateways). |
Applications
| Industrial Serial Gateway | Legacy Bus Bridge |
|---|---|
Use Scenario: Buffering data between an RS-485 fieldbus master and a slower SPI-based sensor controller in a PLC backplane. IC Role / Device Role / Timing Role: Asynchronous FIFO decouples timing domains, absorbs bursty traffic, and prevents overrun during SPI transaction gaps. Use Value: Eliminates lost frames due to timing mismatches; EF/FF flags directly drive enable logic on both sides without firmware intervention. | Use Scenario: Interfacing a 16-bit ISA bus peripheral to a modern ARM-based controller using discrete glue logic. IC Role / Device Role / Timing Role: Rate-matching buffer absorbing write bursts from ISA and pacing reads to match ARM bus timing constraints. Use Value: Enables drop-in replacement of obsolete FIFOs in legacy industrial PC designs without redesigning timing-critical control logic. |
| HDLC Protocol Engine | Motor Control Data Pipeline |
Use Scenario: Storing framed HDLC packets in a telecom line card before CRC calculation and transmission over T1/E1 interface. IC Role / Device Role / Timing Role: First-in/first-out staging buffer with retransmit support for automatic frame retry on CRC failure. Use Value: RT input allows immediate restart of packet transmission from start-of-frame without host CPU involvement or memory reload. | Use Scenario: Capturing high-speed encoder quadrature pulses and feeding position data to a motion controller at deterministic intervals. IC Role / Device Role / Timing Role: Synchronizing bursty encoder edge events to a fixed-rate control loop execution schedule. Use Value: Prevents missed counts during controller interrupt latency; HF flag triggers DMA fetch before buffer underflow occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 7201LA15SOG8 | 15 ns access time (vs. 12 ns); otherwise identical pinout, functionality, and package. | Suitable where 12 ns timing margin is unnecessary-reduces cost and EMI in lower-speed industrial interfaces. | Select when system clock domain operates ≤33 MHz and board layout lacks tight timing closure for 12 ns path. |
| 7201LA20SOG8 | 20 ns access time; same 512×9 organization, TSSOP-28 package, and industrial temp range. | Offers higher noise immunity and relaxed setup/hold timing for long trace runs or noisy factory-floor environments. | Prefer when operating near voltage extremes (4.5 V) or ambient temperatures approaching +85°C with marginal timing margins. |
Compared with 7201LA12SOG8, the 15 ns and 20 ns variants trade raw speed for improved robustness and cost efficiency-making them viable alternatives in applications where deterministic 12 ns latency is not required, such as non-real-time data logging or supervisory control layers.
Availability
7201LA12SOG8 is available at Aetrix Electronics and suitable for industrial serial gateways, legacy bus bridges, HDLC protocol engines, and motor control data pipelines requiring stable component supply amid end-of-life transitions.
Supply support for 7201LA12SOG8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The IDT7200/7201/7202 family-including 7201LA12SOG8-was designed specifically for deterministic, low-latency data buffering in legacy industrial and telecom systems requiring asynchronous rate adaptation and hardware-managed flow control.
FAQ
What is the memory organization of the 7201LA12SOG8?
The 7201LA12SOG8 provides a 512 × 9-bit first-in/first-out memory array. This means it stores up to 512 words, each 9 bits wide-supporting 8 data bits plus 1 parity bit for error detection in serial communication applications. Its organization is fixed and not programmable; the 9-bit width is inherent to the IDT7201LA series architecture.
Does the 7201LA12SOG8 support depth expansion across multiple devices?
Yes, the 7201LA12SOG8 supports depth expansion via its XI (Expansion In) and XO/HF (Expansion Out/Half-Full) pins. When XI is connected to the XO of a preceding device, multiple 7201LA12SOG8 units can be daisy-chained to create larger FIFO depths (e.g., 1024, 1536 words). Note that the retransmit (RT) and half-full (HF) functions are disabled in depth expansion mode.
What is the purpose of the FL/RT pin on the 7201LA12SOG8?
The FL/RT pin on the 7201LA12SOG8 serves dual roles: in single-device mode (XI grounded), it functions as Retransmit (RT)-a LOW pulse resets the read pointer to location zero while preserving the write pointer. In depth expansion mode, it acts as First Load (FL)-grounded on the first device to designate the head of the chain. Its behavior is mode-dependent and defined by the XI connection.
Can the 7201LA12SOG8 operate with a 3.3 V supply?
No, the 7201LA12SOG8 is specified for 4.5 V to 5.5 V operation only. Its DC and AC electrical characteristics-including VIH/VIL thresholds, output drive strength, and timing parameters-are validated exclusively at 5 V ±10%. Using 3.3 V will result in undefined logic levels, failed flag assertions, and unreliable read/write cycles. For 3.3 V systems, consider newer FIFO families such as Renesas' 72V2111 or IDT's 72T36xx series.
Is the 7201LA12SOG8 still in production?
The 7201LA12SOG8 entered End-of-Life (EOL) per Renesas PDN# SP-17-02, with last-time-buy expiring June 15, 2018. Aetrix Electronics maintains limited legacy inventory and offers lifecycle management support-including obsolescence forecasting, cross-reference guidance, and controlled distribution-for ongoing industrial maintenance and repair programs.
7201LA12SOG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 28-SOIC (0.345", 8.77mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- 4.5K (512 x 9)
- Function:
- Asynchronous
- Data Rate:
- 50MHz
- Access Time:
- 12ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 80mA
- 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:
- 28-SOIC
7201LA12SOG8 FAQ
1.How can I place an order for 7201LA12SOG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7201LA12SOG8 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 7201LA12SOG8 reliable?
The price and inventory of 7201LA12SOG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7201LA12SOG8 is usually 5 days.
3.What payment methods are accepted for 7201LA12SOG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7201LA12SOG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7201LA12SOG8?
7201LA12SOG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7201LA12SOG8 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 7201LA12SOG8?
For technical support, including 7201LA12SOG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7201LA12SOG8 requirements.
6.How does Aetrix verify that 7201LA12SOG8 is sourced from the original manufacturer or authorized distributors?
All 7201LA12SOG8 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 7201LA12SOG8 meets industry standards.
7.What is the process for return or replacement of 7201LA12SOG8?
All 7201LA12SOG8 units undergo pre-shipment inspection (PSI). If there is an issue with 7201LA12SOG8, 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 7201LA12SOG8 part is unused and in its original packaging.
Return procedure for 7201LA12SOG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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