描述 Description

The Lattice Semiconductor ispGDS? family is an ideal solution for reconfiguring system signal routing or replacing DIP switches used for feature selection. With today’s demands for customer ease of use, there is a need for hardware which is easily reconfigured electronically without dismantling the system. The ispGDS devices address this challenge by replacing conventional switches with a software configurable solution. Since each I/O pin can be set to an independent logic level, the ispGDS devices can replace most DIP switch functions with about half the pin count, and without the need for additional pull-up resistors. In addition to DIP switch replacement, the ispGDS devices are useful as signal routing cross-matrix switches. This is the only non-volatile device on the market which can provide this flexibility.

特性 Features

? HIGH-SPEED SWITCH MATRIX

— 7.5 ns Maximum Propagation Delay

— Typical Icc = 25 mA

— UltraMOS? Advanced CMOS Technology

? FLEXIBLE I/O MACROCELL

— Any I/O Pin Can be Input, Output, or Fixed

TTL High or Low

— Programmable Output Polarity

— Multiple Outputs Can be Driven by One Input

? IN-SYSTEM PROGRAMMABLE (5-VOLT ONLY)

— Programming Time of Less Than One Second

— 4-Wire Programming Interface

— Minimum 10,000 Program/Erase Cycles

? E2 CELL TECHNOLOGY

— Non-Volatile Reprogrammable Cells

— 100 Tested/100 Yields

— High Speed Electrical Erasure (<100ms)

— 20 Year Data Retention

? APPLICATIONS INCLUDE:

— Software-Driven Hardware Configuration

— Multiple DIP Switch Replacement

— Software Configuration of Add-In Boards

— Configurable Addressing of I/O Boards

— Multiple Clock Source Selection

— Cross-Matrix Switch

? ELECTRONIC SIGNATURE FOR IDENTIFICATION