TC1775 Datasheet, PDF (74/101 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1775
Preliminary
Input/Output DC-Characteristics (cont’d)
V_SS = 0 V; T_A = -40 °C to +125 °C;
Parameter¹⁾
Symbol
Limit Values
Constant short-circuit
current
Constant back-drive
current
(per digital pin)
Pin capacitance⁹⁾
(Digital I/O)
I_SCBDcons
SR
C_IO CC
min.
–
–
max.
±10
10
Unit Test Conditions
mA ¹²⁾⁹⁾
pF f = 1 MHz
T_A = 25 °C
Class C Pins (V_DDOSC = 2.30 to 2.75 V), see Page 76
1) _{All Class A pins of the TC1775 are equipped with Low-Noise output drivers, which significantly improve the}
device’s EMI performance. These Low-Noise drivers deliver their maximum current only until the respective
target output level is reached. After that the output current is reduced. This results in an increased impedance
of the driver, which attenuates electrical noise from the connected PCB tracks. The current, which is specified
in column “Test Conditions”, is delivered in any case.
2) _{This specification is not valid for outputs of GPIO lines, which are switched to open drain mode. In open drain}
mode the output will float and the voltage results from the external circuitry.
3) _{Output drivers in high current mode.}
4) _{Condition for output driver in dynamic current mode & low current mode – guaranteed by design}
characterization.
5) _{Input characteristics can be switched between TTL and CMOS via register Px_PICON except for dedicated}
pins which have CMOS input characteristics.
6) _{The maximum current can be drawn while the respective signal line remains inactive.}
7) _{The minimum current must be drawn in order to drive the respective signal line active.}
8) _{In case of Class B pins VDDx = VDDP05. In case of Class A pins VDDx = VDDP813.}
9) _{Guaranteed by design characterization.}
10) _{The max. peak-short-circuit current resp. max. peak-back-drive current is limited by max. 20 mA and the peak}
period equivalent of 10 mA constant-short-circuit current resp. 10 mA constant-back-drive current. The integral
of I_SCBDpeak over the peak period is thus limited to 10 mA (provided: I_SCBDpeak ≤ 20 mA).
11) _{To be defined for Class B pads.}
12) _{Short-circuit or back-drive conditions during operation occur if the voltage on the respective pin exceeds the}
specified operating range (i.e. V_SCBD > V_DDPx + 0.5 V or V_SCBD < V_SS - 0.5 V) or a short circuit condition
occurs on the respective pin. The absolute sum of input I_SCBD and I_OV currents on all port pins must not exceed
100 mA at any time. The supply voltage (V_DDPx and V_SS) must remain within the specified limits. Under short-
circuit conditions the corresponding pin is not ready for use. In case of Class B pins V_DDx = V_DDP05. In case of
Class A pins V_DDx = V_DDP813.
Data Sheet
70
V1.2, 2002-05