Renesas 72215LB15PFGI8

Overview

IDT72215LB15PFGI8 from Integrated Device Technology (IDT) is a 512 × 18-bit synchronous FIFO memory IC with dual-clock operation, 10 ns read/write cycle time, and industrial temperature support (–40°C to +85°C). It features programmable Almost-Empty/Almost-Full flags, Half-Full flag, and depth/width expandability-used in LAN controllers, optical disk interfaces, and interprocessor data buffering where deterministic latency and clock domain bridging are critical.

For engineers reviewing the IDT72215LB15PFGI8 datasheet, IDT72215LB15PFGI8 pinout, IDT72215LB15PFGI8 application, or IDT72215LB15PFGI8 equivalent, this page delivers verified timing parameters, flag behavior under dual-clock skew, offset register programming sequence, TQFP-64 package mapping, and real-world expansion configuration guidance for multi-device FIFO stacks.

Technical Context

This device implements a dual-port zero fall-through time architecture with independent read/write pointer logic, asynchronous flag generation (PAE/PAF), and synchronized status flags (EF/FF). Its submicron CMOS process enables 100 MHz clock operation (tCLK = 10 ns) while maintaining low active current (ICC1 ≤ 60 mA) and fast output enable timing (tOE = 6 ns).

The FIFO supports both single-clock (RCLK = WCLK) and dual-clock (asynchronous RCLK/WCLK) modes, with tSKEW1/tSKEW2 specifications ensuring reliable Full/Empty flag updates across clock domain boundaries. Expansion via WXI/WXO and RXI/RXO pins enables daisy-chained depth scaling without external logic.

Key Specifications

Pinout & Package

Package: 64-lead thin quad flatpack (TQFP), lead finish SnPb (EOL as of June 15, 2018), body size 10 mm × 10 mm, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NB3N502DG and 72V211L15PF, IDT72215LB15PFGI8 delivers full 18-bit width in a single device, faster 10 ns timing, and integrated Half-Full flag-making it optimal for legacy 5 V industrial systems requiring minimal component count and precise flow control.

Availability

IDT72215LB15PFGI8 is available at Aetrix Electronics and suitable for LAN controllers, optical storage interfaces, and interprocessor communication systems requiring stable component supply and long-term industrial temperature support.

Supply support for IDT72215LB15PFGI8 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, and RF solutions for communications and computing markets.

IDT72215LB15PFGI8 belongs to the SyncFIFO™ family-designed specifically for high-speed, low-latency data buffering in clock-domain-crossing applications where deterministic timing and expandability are essential.

FAQ

What is the maximum clock frequency supported by IDT72215LB15PFGI8?

IDT72215LB15PFGI8 supports up to 100 MHz operation, derived from its 10 ns clock cycle time (tCLK = 10 ns). This is validated across the industrial temperature range (–40°C to +85°C) with VCC = 5 V ±10%. The device maintains timing integrity even under worst-case skew conditions per tSKEW1/tSKEW2 specs.

How does the Half-Full flag (WXO/HF) behave in single-device mode?

In single-device mode (FL, WXI, RXI grounded), IDT72215LB15PFGI8 configures WXO/HF as a Half-Full indicator: it asserts LOW when exactly 256 words (half of 512) are stored, remains LOW until read operations reduce occupancy below 256, and resets HIGH on the next RCLK↑. This provides precise midpoint signaling for balanced buffer management.

Can IDT72215LB15PFGI8 be used in dual-clock mode with arbitrary clock frequencies?

Yes-IDT72215LB15PFGI8 supports fully asynchronous RCLK and WCLK inputs. However, tSKEW1 (min 6 ns) and tSKEW2 (min 6 ns) must be met to guarantee correct FF/EF flag updates. If skew falls below these limits, flag transitions may delay by one clock cycle, affecting real-time control loops.

What are the default programmable flag offsets for IDT72215LB15PFGI8?

IDT72215LB15PFGI8 defaults to PAE = 63 and PAF = 63 words from empty/full states respectively. These values are loaded into the offset registers at power-on reset and can be reprogrammed via LD/WEN sequence using D0–D11. The 63-word offset corresponds to ~12.3% of total depth (512), enabling early flow control.

Is IDT72215LB15PFGI8 pin-compatible with other members of the IDT722xxLB family?

IDT72215LB15PFGI8 shares identical pinout and package (TQFP-64) with IDT72205LB, IDT72225LB, IDT72235LB, and IDT72245LB. However, memory depth differs (256/512/1024/2048/4096), so functional replacement requires verifying depth sufficiency and recalculating PAF/PAE offsets for the target application.