ppc440epx Applied Micro Circuits Corporation (AMCC), ppc440epx Datasheet - Page 72

• Manufacturer Part Number: ppc440epx
• Description: Powerpc 440epx Embedded Processor
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

440EPx – PPC440EPx Embedded Processor
Thermal Monitor
Thermal monitoring of the chip is accomplished using the PNP transistor (β ≈ 2) provided on the chip. The collector
of the transistor is connected to ground (GND). The emitter (TherMonA) and base (TherMonB) are connected to
chip pins. A voltage measurement (V
values I
T = (q/nk)(V
Note: V
same. The small values require precision measurement and current sources.
The calculated on chip (ball to ball) series resistance for the PPC440EPx thermal monitor circuit is 2.0 ohms. The
thermal sensor reflects the PPC440EPx junction temperature.
Test Conditions
Clock timing and switching characteristics are specified in accordance with operating
conditions shown in Table 10 on page 66. AC specifications are characterized with
V
Table 18. Clocking Specifications
72
SysClk Input
Note: Input slew rate ≥ 1V/ns
TrcClk Output
PLL VCO
DD
= +1.5V, T
Symbol
T
T
T
F
T
F
F
T
1
BE2
CS
CH
CL
C
C
C
C
C
and I
PPC440EPx
BE2
and V
C
2
−V
C
provides the chip temperature in °K according to the equation:
= +85 °C and a 50pF test load as shown in the figure to the right.
BE1
B
BE1
Frequency
Period
Edge stability (cycle-to-
cycle jitter)
High time
Low time
Frequency
Frequency
Period
E
)/ln(I
should be specified in Volts. I
Parameter
2
TherMonA
TherMonB
/I
1
) °K
where q = 1.602 176 53×10
BE1
V
Note: The bias voltage V
and V
BE1
I
1
40% of nominal
40% of nominal
, I
, V
CPU
2
BE2
BE2
period
period
(Max = 300μA)
33.33
0.750
Min
600
15
–
F
) across the TherMonA and TherMonB pins at the two current
1
C
/4
and I
2
can be any units of measure provided they are the
EB
60% of nominal
60% of nominal
should be between +0.5V and +0.7V.
-19
CPU
1333.33
, n = 1.0 ± 0.015, and k = 1.380 6505×10
period
period
66.66
±0.15
Max
1.66
30
F
C
/4
Preliminary Data Sheet
Revision 1.29 – July 22, 2008
Units
MHz
MHz
ns
ns
ns
ns
ns
Output
Pin
AMCC Proprietary
Notes
50pF
-23
.