Renesas 7202LA15SOGI

Overview

7202LA15SOGI from IDT (now Renesas Electronics) is a 1,024 × 9-bit asynchronous CMOS FIFO memory IC used for rate buffering and data flow synchronization between mismatched clock domains or bus protocols. It features 15 ns access time, ultra-low active power (max 440 mW), full/half-full/empty status flags, and auto-retransmit capability. It is deployed in legacy telecom line cards, industrial PLC backplanes, and military avionics data interfaces requiring deterministic latency and MIL-STD-883 Class B compliance.

For engineers reviewing the 7202LA15SOGI datasheet, 7202LA15SOGI pinout, 7202LA15SOGI application, or 7202LA15SOGI equivalent, key selection criteria include its 1,024-word depth, 9-bit width with parity support, 5 V single-supply operation, TSSOP-28 package, and compatibility with depth/width expansion architectures - all critical for legacy system sustainment and FIFO-based protocol bridging.

Technical Context

The 7202LA15SOGI implements a dual-port ring-buffer architecture with independent read/write pointers, eliminating address management overhead. It operates fully asynchronously: write and read cycles are triggered on falling edges of W and R inputs, with no shared clock required.

Status logic generates EF (Empty Flag), FF (Full Flag), and XO/HF (Half-Full Flag) based on pointer arithmetic, enabling real-time buffer occupancy monitoring. Its FL/RT pin supports retransmit mode (resetting read pointer without affecting write pointer), while XI/XO pins enable daisy-chained depth expansion across multiple devices - a feature confirmed for IDT7202LA family members per datasheet Section 9.

Key Specifications

Pinout & Package

7202LA15SOGI is housed in a 28-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, lead-free (RoHS-compliant) finish, and industrial temperature rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO memory applications.

Compared with 7202LA15SOGI, the 7202LA20SOGI trades 5 ns speed for potential cost and power advantages, while 7202LA15SOI maintains identical timing but uses a larger SOIC package - making it viable for footprint-compatible upgrades or mixed-technology boards where TSSOP assembly is constrained.

Availability

7202LA15SOGI is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line interface modules, and military avionics data links requiring stable component supply for long-lifecycle programs.

Supply support for 7202LA15SOGI 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a semiconductor company specializing in timing, memory interface, and high-performance interconnect solutions.

The IDT7200L/7201LA/7202LA family was engineered for deterministic, low-latency data buffering in legacy multiprocessing and rate-adaptation systems - targeting applications where asynchronous handshake reliability and MIL-STD-883 qualification outweigh modern integration trends.

FAQ

What is the memory organization of the 7202LA15SOGI?

The 7202LA15SOGI implements a 1,024 × 9-bit first-in/first-out memory array. This means it stores up to 1,024 words, each 9 bits wide - supporting 8-bit data plus 1 parity bit for error detection in serial communications. The architecture uses internal ring pointers, so no external address lines are needed; data is loaded and unloaded strictly in sequential order via W and R control signals. This organization is fixed and cannot be reconfigured.

Does the 7202LA15SOGI support depth expansion, and how is it implemented?

Yes, the 7202LA15SOGI supports depth expansion using its XI (Expansion In) and XO/HF (Expansion Out) pins. In Depth Expansion Mode, multiple 7202LA15SOGI devices are daisy-chained: XO of one device connects to XI of the next. The first device has FL/RT grounded; others hold FL/RT HIGH. External logic must OR all EF and FF outputs to generate composite flags. Critically, the retransmit (RT) and half-full (HF) functions are disabled in this mode - a documented limitation per datasheet Section 9.

What are the voltage and timing requirements for the 7202LA15SOGI reset function?

The 7202LA15SOGI requires an active-LOW reset pulse on the RS pin with minimum width of 15 ns (for 15 ns speed grade) and setup/hold timing relative to W and R inputs. Per datasheet AC specs, tRS = 15 ns min, tRSS = 15 ns setup before rising edge, and tRSR = 10 ns recovery after rising edge. VCC must be within 4.5 V–5.5 V during reset. Upon assertion, RS forces both read and write pointers to location zero, sets EF = LOW and FF = HIGH, and resets HF to HIGH - ensuring deterministic startup state before any read/write activity.

Can the 7202LA15SOGI operate in a read-data-flow-through mode, and what is its latency?

Yes, the 7202LA15SOGI supports read-data-flow-through mode: after writing one word into an empty FIFO, that word becomes readable on the next valid read cycle. Total latency from rising edge of W to valid Q0–Q8 output is tWEF + tA = 15 ns + 15 ns = 30 ns max (per datasheet Figures 17 and AC table). During this window, EF pulses LOW then HIGH, confirming transient emptiness. This mode enables pipelined data transfer without intermediate storage registers - useful in real-time signal processing chains where minimal latency is critical.

Is the 7202LA15SOGI RoHS-compliant, and what is its lead finish?

Yes, the 7202LA15SOGI is RoHS-compliant with lead-free (Pb-free) finish. The "G" suffix in the part number (7202LA15SOGI) explicitly denotes green/RoHS packaging per IDT's ordering guide. This replaces legacy SnPb (tin-lead) versions, which entered EOL with last-time-buy ending June 15, 2018. The device meets JEDEC J-STD-609 Category 1 moisture sensitivity level and is qualified for standard reflow profiles per IPC/JEDEC J-STD-020.