PPC440EPX-NPAFFFTS AMCC [Applied Micro Circuits Corporation], PPC440EPX-NPAFFFTS Datasheet - Page 73

• Manufacturer Part Number: PPC440EPX-NPAFFFTS
• Description: PowerPC 440EPx Embedded Processor
• Manufacturer: AMCC [Applied Micro Circuits Corporation]

Revision 1.26 – October 15, 2007
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
AMCC Proprietary
Preliminary Data Sheet
SysClk Input
Note: Input slew rate ≥ 1 V/ns
PLL VCO
Processor (CPU) Clock
DD
= +1.5 V, T
Symbol
T
T
T
F
T
F
T
F
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 50 pF 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
Period
Frequency
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
2
333.33
BE2
BE2
period
period
(Max = 300μA)
33.33
0.750
Min
600
15
–
) across the TherMonA and TherMonB pins at the two current
1
and I
440EPx – PPC440EPx Embedded Processor
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
1333.33
666.66
, n = 1.0 ± 0.015, and k = 1.380 6505×10
period
period
66.66
±0.15
Max
1.66
30
Units
MHz
MHz
MHz
ns
ns
ns
ns
ns
Output
Pin
Notes
1
50pF
-23
.
73