isppac-powr1220at8 Lattice Semiconductor Corp., isppac-powr1220at8 Datasheet - Page 14

• Manufacturer Part Number: isppac-powr1220at8
• Description: In-system Programmable Power Supply Monitoring, Sequencing And Margining Controller
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Figure 1-5. Verify Timing Diagram
Figure 1-6. Discharge Timing Diagram
Theory of Operation
Analog Monitor Inputs
The ispPAC-POWR1220AT8 provides 12 independently programmable voltage monitor input circuits as shown in
Figure 1-7. Two individually programmable trip-point comparators are connected to an analog monitoring input.
Each comparator reference has 368 programmable trip points over the range of 0.664V to 5.734V. Additionally, a
75mV ‘zero-detect’ threshold is selectable which allows the voltage monitors to determine if a monitored signal has
dropped to ground level. This feature is especially useful for determining if a power supply’s output has decayed to
a substantially inactive condition after it has been switched off.
State
TCK
TMS
State
TCK
TMS
VIH
VIH
VIL
VIL
VIH
VIH
VIL
VIL
Update-IR
Update-IR
t
SU1
t
SU1
t
CKH
t
H
Run-Test/Idle (Erase or Program)
t
CKH
t
SU1
t
H
t
CKL
t
SU1
t
CKL
Run-Test/Idle (Program)
t
H
t
H
t
PWP
t
SU1
t
PWV
Select-DR Scan
t
CKH
t
SU1
t
H
1-14
Select-DR Scan
t
CKH
t
H
ispPAC-POWR1220AT8 Data Sheet
t
SU1
t
HVDIS
(Actual)
t
CKH
t
H
t
t
Run-Test/Idle (Verify)
SU1
SU1
t
CKL
t
Specified by the Data Sheet
CKH
t
CKH
t
H
Update-IR
t
H
t
PWV
t
SU1
t
CKL
t
Actual
SU1
t
PWV
t
CKH
t
H
t
CKH
t
H