Infineon Technologies CYPRESS Traveo Series Manual page 156

• Use at DC voltage (current).
MCU is non-operational, PCB is in reverse polarity condition (supply of the MCU is off), negative biased voltage level (-B
signal) is applied to inactive IO according to following specification (must not be exceeded).
Reverse polarity condition specification:
U_reverse = max -28 V
T_reverse = max 4 h
Current and Power Dissipation
U_reverse = -28 V
R_serial = 22 k
=> I_pin = 1.3 mA
U_out = -0.7 V (current drawn mainly over clamping diodes)
=> I_total = 50 pins x 1.3 mA = 65 mA
=> P_total = 50 pins x (1.3 mA x 0.7 V) = 46 mW
I_total and P_total are within allowed limits of extended specification.
• The - B signal should always be applied by connecting a limiting resistor between the - B signal and the microcontroller.
• The value of the limiting resistor should be set so that the current input to the microcontroller pin does not exceed rated
values at any time regardless of instantaneously or constantly when the - B signal is input.
• Do not leave - B input pins open.
Example of a recommended circuit
S6J3350 series
WARNING:
−
Semiconductor devices may be permanently damaged by application of stress (including, without limitation, voltage, current
or temperature) in excess of absolute maximum ratings. Do not exceed any of these ratings.
Document Number: 002-10634 Rev. *J
S6J3350 Series
Page 155 of 307