DS89C450-K00 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – DS89C450 Evaluation Kit

TYPICAL OPERATING CIRCUIT
DS89C450-K00, DS89C450 Evaluation Kit
Figure 2. DS89C450 Evaluation Kit Board Layout
DETAILED DESCRIPTION
This evaluation kit must be used with the DS89C430/DS89C440/DS89C450 ultra-high-speed flash microcontrollers
data sheet and the Ultra-High-Speed Flash Microcontroller User’s Guide (www.maxim-ic.com/user_guides). A
complete description of the bootstrap loader commands and functions is located in Section 15 of the Ultra-High-
Speed Flash Microcontroller User’s Guide.
The DS89C450 Evaluation Kit Board and all of its connectors are defined in the schematics provided in the
accompanying documentation disk. However, a short description of the major components of the board follows.
Power Supplies
The evaluation kit accepts a DC input supply at J1. The supply should be a 6V to 9V DC supply, center post
positive, with at least 300mA capacity. The exact DC input value of the supply is not important, as the on-board
linear MAX1658 and MAX1659 regulators produce fixed 5V and 3.3V for use by the kit circuitry.
While it is possible to supply up to 16V at J1 (the maximum input voltage of the MAX1658 and MAX1659), this will
result in a large amount of heat dissipation from the board. A small heat-sink plane is provided on the backside of
the board beneath the linear regulators, but this may be inadequate at input voltages above 9V. If U1 and U2 are
hot, lower the DC input voltage at J1. Note that many unregulated DC wall plug-in supplies may provide an output
level much higher than their labeled output value if they are lightly loaded.
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