iC-HC
ULTRA FAST DUAL HV-KOMPARATOR
Rev A1, Page 7/10
VI(x)diff
Hold function with external R/C network
Using external R/C networks at TO and T1 results in
signals as shown in Figure 5. The threshold is set to
2/3 VDD, hence the hold time is calculated using τ to
thold = Rext * Cext. The discharging is accomplished
via ca. 25 Ω and hence neglible, since the ext. resistor
(vs. VDD) may not be smaller than 2 kΩ. The hold time
for comparator 0 is set by R0 and C0, whereas R1 and
C1 set the hold time for comparator 1.
time
V(Tx)
VDD
2
VDD
/
3
time
GND
Hold-
thold
thold
VDD
VP
T0
3
4
5
14
13
12
Timer
(int.)
R0
C0
P0
P1
time
time
HYS
HOLD
thold = Rext * Cext
R1
C1
VO(x)hold
T1
Figure 5: Signals at T0 (T1) with ext. R/C network
Figure 4: R/C network connection
EVALUATION BOARD
For the iC-HC an Evaluation Board is available for test
purposes. The following figures show the schematic
diagram and the component side of the test PCB.
ICHAUS [ IC-HAUS GMBH ]
