Z0840004PSC Zilog, Z0840004PSC Datasheet - Page 87

• 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
THERMAL CHARACTERISTICS
Calculation of Device Junction Temperature
Failure rates and Failures in Time (FITS) obtained from life test data are based on ambient
temperatures (TA), and are not corrected to junction temperature (TJ). However, when a significant
difference between TA and TJ exists, TJ can be incorporated into the Arrhenius Equation for
accelerated failure rates by using the following equations:
Junction Temp. (T
Case Temperature (T
Illustration:
1.
2.
For the Z86C04 in plastic (copper);
ZAC03-0004
At 25°C, maximum power dissipation for this device is 0.08 watts.
For our example, ambient temperature is denoted by T
Therefore,
where:
and:
where:
J
In order to calculate junction temperature (T
static airflow for the Z86C04 in an 18L PDIP, we do the following:
):
C
):
the maximum power dissipation at T
T
JA
JC
A
is the ambient temperature °C.
is the thermal resistance of junction with respect to case.
is the thermal resistance of junction with respect to ambient (C/W). P
T
T
T
C
J
C
= 75 x (0.08) + 25 = 31.2°C, and
= T
= 31.2 – (18 x 0.08) = 29.8°C
J
JA
T
– (
J
and
= (
JC
) (P
JA
JC
) (P
D
are 75 and 18°C/watt respectively.
)
D
) + T
A
A
in watts
A
J
) and case temperature (T
and is assumed to be 25°C.
2002 Quality and Reliability Report
CHAPTER 10
Thermal Properties
C
) for
10- 1
D
is