Infineon Technologies CY7C419-10JC

Overview

CY7C419-10JC from Cypress Semiconductor is a 256 × 9-bit asynchronous FIFO memory IC with dual-ported RAM architecture, TTL-compatible I/O, and independent 50 MHz read/write capability. It provides Empty (EF), Full (FF), and Half-Full (HF) flags, supports retransmit functionality in standalone mode, and operates at 5 V ±10% over commercial temperature range (0°C to +70°C). Used in data buffering between mismatched clock domains in communication interface bridges.

For engineers reviewing the CY7C419-10JC datasheet, CY7C419-10JC pinout, CY7C419-10JC application, or CY7C419-10JC equivalent, key selection criteria include access time (10 ns), power consumption (35 mA at 20 MHz), flag timing behavior (e.g., tREF = 10 ns), and PLCC-32 package compatibility with legacy board layouts.

Technical Context

This FIFO implements a first-in-first-out data buffer using dual-ported static RAM cells, enabling concurrent read and write operations without internal arbitration. Its asynchronous design eliminates clock domain synchronization requirements, and the retransmit (RT) input allows deterministic replay of buffered data upon command.

Flag generation is based on internal pointer comparison logic: EF asserts when read pointer equals write pointer, FF asserts when write pointer wraps to read pointer, and HF asserts at 128-word depth. Expansion pins (XO, XI, XA) support width/depth cascading without serial propagation delay penalty.

Key Specifications

Pinout & Package

CY7C419-10JC uses a 32-pin Plastic Leaded Chip Carrier (PLCC) package with J-shaped leads, 1.27 mm pitch, and body size 11.43 mm × 11.43 mm. Pin 1 is marked by a corner notch; orientation follows JEDEC MS-026AC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7200L10J and AM7200-10JC, CY7C419-10JC uniquely delivers hardware retransmit capability in a Pb-free PLCC package with lowest operating current-making it optimal for new industrial designs requiring reliability, regulatory compliance, and deterministic error recovery.

Availability

CY7C419-10JC is available at Aetrix Electronics and suitable for UART buffering, legacy bus bridging, industrial PLC communication modules, and ATE pattern generation requiring stable component supply and long-term obsolescence management.

Supply support for CY7C419-10JC 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

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in programmable systems-on-chip, memory, and interface solutions for industrial, automotive, and consumer applications.

CY7C419 belongs to Cypress's legacy asynchronous FIFO product line, designed specifically for clock-domain isolation and deterministic data buffering in mixed-speed digital systems where software-managed queues introduce unacceptable latency or jitter.

FAQ

What is the function of the RT (Retransmit) pin on CY7C419-10JC?

The RT pin is an active-LOW input that forces the read pointer to reset to zero while preserving the current write pointer and stored data. This enables hardware-triggered replay of the entire FIFO contents without data loss or external address management. It is asserted only when both R and W are HIGH, and data is then accessed via normal read strobes. The feature is exclusive to standalone and width-expansion configurations.

Can CY7C419-10JC be used in industrial temperature range (–40°C to +85°C)?

No. CY7C419-10JC is rated only for commercial temperature range (0°C to +70°C), as confirmed by its "C" suffix and datasheet operating range table. Industrial-grade variants such as CY7C419-10JCI exist with identical pinout and timing but qualified to –40°C to +85°C and higher ICC (100 mA max at f_MAX). Using the -10JC part outside its specified range risks flag timing violations and increased leakage current.

How does the Half-Full (HF) flag behave during depth expansion?

In depth expansion mode, the HF pin functions as Expansion Out (XO), signaling activation status to the next FIFO in the chain. It does not indicate half-full condition. The transition occurs with 10–25 ns delay relative to the clock edge (t_XOL/t_XOH). In standalone or width-expansion modes, HF asserts LOW at exactly 128 words occupied and remains valid throughout operation, supporting preemptive flow control before full/empty conditions occur.

Is CY7C419-10JC pin-compatible with CY7C421-10JC?

No. Although both are Cypress asynchronous FIFOs, CY7C419-10JC is 256 × 9 and uses 32-pin PLCC, while CY7C421-10JC is 512 × 9 and requires 32-pin TQFP or SOJ packages with different pin assignments for EF/FF/HF and expansion signals. Their pinouts are not interchangeable-direct replacement would cause functional failure due to misrouted flags and control lines.