ICS1532 Datasheet, PDF (33/36 Pages) Integrated Device Technology – 110 MHZ TRIPLE 8-BIT ADC WITH CLOCK GENERATOR

ICS1532
110 MHZ TRIPLE 8-BIT ADC WITH CLOCK GENERATOR
12.2 Resetting the ICS1532 to a known state
Below is shown the two ways to reset the ICS1532 to a known state.
12.2.1 Reset Pin Input
Momentarily bring the active high RESET# input pin low to cause the part to reset to a known state.
12.2.2 Power-On Reset (POR) Timing
The ICS1532 incorporates special internal power-on reset circuitry that requires no external reset signal.
To use the POR circuitry:
– Reduce the level of the all supply voltages to the ICS1532 (and the voltage seen on all ICS1532
pins) so that it is below the threshold voltage (VDD_th) of the POR circuit for the period t1 shown
below
– Keep the supply voltage below that threshold voltage for time t1, such that power-conditioning
capacitors for the printed circuit board are drained and the proper reset state is latched.
• A successful power-on reset results in all the ICS1532 registers having the appropriate reset values as
stated in the tables in Chapter 4, “Register Set”.
Table 12-3. ICS1532 POR Transition Times
Symbol
VDD
VDD_th
t₁
Timing Description
Supply Voltage (‘On’ State)
Threshold Supply Voltage
Hold Time for Reset State
Min
Typ
Max
Units
3.15
3.3
3.45
V
1.8
V
10
ms
Figure 12-5. Power-On Reset Condition for ICS1532
VDD_min
VDD_th
t₁
MDS 1532 G
33
www.idt.com
Revision 060804