Z0840004PSC Zilog, Z0840004PSC Datasheet - Page 32

• Manufacturer Part Number: Z0840004PSC
• Description: IC 4MHZ Z80 NMOS CPU 40-DIP
• Manufacturer: Zilog

Specifications of Z0840004PSC

• Processor Type: Z80
• Features: NMOS
• Speed: 4MHz
• Voltage: 5V
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.620", 15.75mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ZiLOG
2002 Quality and Reliability Report
CHAPTER 4
Quality Monitor Systems
FAILURE RATE PREDICTION CALCULATIONS
ZiLOG estimates the operating life of our products through statistical methods. It is not possible to
guarantee the lifetime of an individual part because the tests to determine this are destructive.
Therefore, we can only use statistics to predict the typical behavior of groups of parts. These
predictions, and the methods they are based on, are documented in FIT reports. The FIT report is
based on process specific data and is derated to reflect individual device characteristics. FIT
reports are available for all of ZiLOG’s products.
Other factors that affect device lifetime include actual operating hours, ambient temperature,
stability of the power supply, board assembly and other handling practices. All of these factors are
outside of the control of ZiLOG and may dramatically shorten the lifetime of a device.
The failure rate for each product and process is a function of time, temperature and applied power.
The primary temperature is, of course, the product junction temperature. This is externally
influenced by the ambient temperature and internally influenced by the power dissipated in the die.
The power dissipation, in turn, is a function of the duty cycle and applied VCC. In the case of
CMOS, product power dissipation is also a function of the operating frequency. ZiLOG product
failure rates were derived from accelerated life test results accumulated on an ongoing basis as part
of the ZiLOG reliability monitor. The accelerated life test reliability data includes both infant
mortality (early life results 0-160 hours) and long term life results (168-1000 hours). Various
interim time points and sample sizes are used. Lifetest may be performed at either 125°C for 1000
hours or the Mil-Std-883 equivalent or 150°C for 184 hours.
ZAC03-0004
4 - 1