CXD1172AM/AP
Latch Up Prevention
The CXD1172A is a CMOS IC which requires latch up precautions. Latch up is mainly generated by the lag in
the voltage rising time of AVDD (Pins 10 and 14) and DVDD (Pins 9 and 15), when power supply is ON.
1. Correct usage
a. When analog and digital supplies are from different sources
AVDD
DVDD
10 14
9 15
AVDD
DVDD
+5V
+5V
C6
C14
CXD1172A
DIGITAL IC
AVSS
AVSS
16
DVSS
8
DVSS
b. When analog and digital supplies are from a common source
(i)
DVDD
10 14
9 15
AVDD
DVDD
+5V
C6
C14
CXD1172A
AVSS
AVSS
16
DVSS
8
DVSS
DIGITAL IC
(ii)
DVDD
+5V
C6
AVSS
10 14
9 15
AVDD
DVDD
C14
CXD1172A
AVSS
16
DVSS
8
DVSS
–8–
DIGITAL IC