Specifications

171
3706C–MICRO–2/11
AT89LP3240/6440
26.3 Safe Operating Conditions
26.3.1 Speed
Figure 26-1 shows the safe operating frequencies for the AT89LP3240/6440 versus supply volt-
age. The device is only gau ranteed to operate correctly within this area. Note that the on-chip
Brown-out Detector (BOD) has a minimum threshold of 1.8V. Systems that rely on this BOD to
prevent incorrect operation due to power loss should only operate at 12 MHz or below. Systems
at higher frequencies may require an external BOD.
Figure 26-1.
Operating Frequency vs. VDD
26.3.2 Power Dissipation
Figure 26-2. Maximum Operating Current vs. Temperature (V
DD = 3.3V)
26.4 Typical Characteristics
The following charts show typical behavior. These figures are not tested during manufacturing.
All current consumption measurements are performed with all I/O pins configured as quasi-bidi-
rectional (with internal pull-ups). A s quare wave generator with rail-to-rail output is used as an
external clock source for consumption versus
frequency measurements.
0 1.8 2.7 3.6
12
20
24
2.4
VDD (V)
Frequency (MHz)
-40
0
100
200
Temperature (°C)
I
OUTPUT
(mA)
50
150
65 85
PDIP
TQFP
PLCC
MLF/QFN
68 75 79
67
74
121