Renesas 7203L35J

Overview

IDT7203L35J from Integrated Device Technology is a 2,048 x 9-bit asynchronous CMOS FIFO memory buffer with 35 ns access time, industrial temperature range (–40°C to +85°C), and PLCC-32 package. It supports simultaneous read/write operations, features Empty/Full/Half-Full status flags, and enables retransmit functionality for data recovery in buffering applications such as serial protocol bridging and DSP interface synchronization.

For engineers reviewing the IDT7203L35J datasheet, IDT7203L35J pinout, IDT7203L35J application, or IDT7203L35J equivalent, key selection considerations include its 9-bit data width with parity/control bit option, 35 ns access timing, dual-port asynchronous operation, and compatibility with width/depth expansion architectures for scalable buffering.

Technical Context

The IDT7203L35J implements a first-in/first-out dual-port memory architecture using high-speed CMOS technology, with independent write and read pointers managed by internal logic. It operates without clock synchronization between input and output domains, enabling rate-matching between mismatched data streams.

Status flag generation (EF, FF, XO/HF) is hardware-based and edge-triggered, with deterministic propagation delays tied to control signal transitions (e.g., tREF ≤ 30 ns, tRFF ≤ 30 ns). The FL/RT pin serves dual roles-First Load in depth expansion mode and Retransmit enable in single-device mode-requiring external logic coordination for mode selection.

Key Specifications

Pinout & Package

Package: 32-pin Plastic Leaded Chip Carrier (PLCC), J-lead variant, surface-mountable with gull-wing leads and body size 13.97 mm × 13.97 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT2227N and IDT7203L35SO, the IDT7203L35J offers industrial temperature operation and full expansion support-making it suitable for ruggedized systems requiring field-upgradeable buffering, whereas the alternatives trade robustness or scalability for cost or size.

Availability

IDT7203L35J is available at Aetrix Electronics and suitable for industrial automation, telecommunications infrastructure, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IDT7203L35J 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions.

The IDT7203L35J belongs to the IDT720x family of asynchronous FIFOs, designed specifically for deterministic data buffering in mixed-clock-domain systems where latency predictability and overflow/underflow prevention are critical.

FAQ

What is the maximum operating frequency supported by the IDT7203L35J?

The IDT7203L35J does not operate on a clock; it is an asynchronous FIFO. Its performance is specified by access time (t_A ≤ 35 ns) and cycle times (e.g., t_RC ≤ 45 ns, t_WC ≤ 45 ns), supporting effective data throughput up to approximately 22.2 MHz in read/write cycling. System-level timing depends on external control signal slew rates and board layout.

Does the IDT7203L35J support automatic handshaking with external controllers?

No, the IDT7203L35J does not implement automatic handshaking. It relies on external monitoring of EF and FF flags to gate W and R strobes. The host must assert W only when FF = HIGH and R only when EF = HIGH-typically implemented via combinational logic or GPIO polling.

Can the IDT7203L35J be used in depth expansion mode with other IDT720x family members?

Yes, the IDT7203L35J is fully compatible with depth expansion using any IDT720x device (e.g., IDT7204L35J, IDT7205L35J) sharing the same speed grade and temperature range. All devices in the chain must use identical timing specifications and follow the XI/XO daisy-chain wiring and FL/RT pin configuration rules defined in the datasheet.

What is the function of the XO/HF pin on the IDT7203L35J?

The XO/HF pin on the IDT7203L35J is dual-function: in single-device mode (XI = GND), it outputs the Half-Full Flag (HF), going LOW when memory is ≥50% filled; in depth expansion mode (XI tied to prior XO), it outputs an Expansion Out pulse to trigger the next device's write cycle upon reaching end-of-memory.

Is the IDT7203L35J RoHS-compliant?

Yes, the IDT7203L35J is RoHS-compliant. Per IDT ordering information, "Green parts are available" and SnPb lead finish parts were discontinued under PDN# SP-17-02; the J-suffix PLCC package uses lead-free terminations meeting JEDEC J-STD-609 Category 1 requirements.