P R E L I M I N A R Y
Capacitance
Preliminary
Min Max
Symbol
Parameter Description
Input Capacitance
Output or I/O Capacitance
Test Conditions
Unit
pF
CIN
CIO
@ 1 MHz
@ 1 MHz
10
20
pF
Note:
Capacitance limits are guaranteed by characterization.
Power Supply Current
For the following typical system specification shown in
Figure 11, ICC has been measured at 4.0 mA per MHz
of system clock. For the following typical system
specification shown in Figure 12, ICC has been
measured at 5.9 mA per MHz of system clock. The
typical system is measured while the system is
executing code in a typical application with maximum
voltage and maximum case temperature. Actual power
supply current is dependent on system design and may
be greater or less than the typical ICC figure presented
here.
Table 9 shows the variables that are used to calculate
the typical power consumption value for each version
of the Am186ESLV and Am188ESLV microcontrollers.
Table 9. Typical Power Consumption Calculation
for the Am186ESLV and Am188ESLV
MHz ICC Volts / 1000 = P
TypicalPower
in Watts
MHz
Typical ICC
Volts
20
25
4.0
4.0
3.6
3.6
0.288
0.360
Typical current in Figure 11 is given by:
ICC = 4.0 mA freq(MHz)
Typical current in Figure 12 is given by:
140
120
ICC = 5.9 mA freq(MHz)
Please note that dynamic ICC measurements are de-
pendent upon chip activity, operating frequency, output
buffer logic, and capacitive/resistive loading of the out-
puts. For these ICC measurements, the devices were
set to the following modes:
100
80
25 MHz
20 MHz
60
ICC (mA)
n No DC loads on the output buffers
n Output capacitive load set to 35 pF
n AD bus set to data only
40
20
0
10
20
30
n PIOs are disabled
Clock Frequency (MHz)
n Timer, serial port, refresh, and DMA are enabled
Figure 11. Typical ICC Versus Frequency for the
Am186ESLV and Am188ESLV
280
240
40 MHz
200
160
33 MHz
25 MHz
120
20 MHz
ICC (mA)
80
40
0
10
20
30
40
50
Clock Frequency (MHz)
Figure 12. Typical Icc Versus Frequency for Am186ES and Am188ES
Am186/188ES and Am186/188ESLV Microcontrollers
54
AMD [ AMD ]
