C541U Datasheet, PDF (61/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
V_DD
V_DD
V_DD
AC Inputs during testing are driven at V_DD - 0.5 V for a logic ’1’ and 0.45 V for a logic ’0’.
Timing measurements are made at V_IHmin for a logic ’1’ and V_ILmax for a logic ’0’.
Figure 33
AC Testing: Input, Output Waveforms
For timing purposes a port pin is no longer floating when a 100 mV change from load voltage
occurs and begins to float when a 100 mV change from the loaded V_OH/V_OL level occurs.
I_OL/I_OH ≥ ± 20 mA
Figure 34
AC Testing : Float Waveforms
23.8.3VV
Figure 35
Load for D+/D-
D.U.T.
30 k Ω
Test Point
D.U.T ^D+/D-
27Ω
15 k Ω
S1
C_L
1.5 k Ω *)
Test S1
C _L = 50 pF, full speed
C _L = 50 pF, low speed (min. timing)
C _L = 350 pF, low speed (max. timing)
*) 1.5 kΩ on D- (low speed) or D+ (full speed) only
D- / LS
D+ / LS
D- / FS
D+ / FS
Close
Open
Open
Close
MCS03425
Semiconductor Group
59