Datasheet

Auxiliary Input
The adjustable voltage monitor is comparable to an
internal reference of 1.23V as shown in Figure 6. To set
the desired trip level of monitored supply, V
INTH
,
choose: R1 = R2 [(V
INTH
/ 1.23) - 1)]. For example, for a
voltage detection at 4.5V (assume R2 = 100kΩ), R1 =
265kΩ.
Unused Inputs
The unused inputs (except the auxiliary) are internally
connected to ground through the lower resistors of the
threshold-setting resistor pairs. The auxiliary (AUX)
input, however, must be connected to either ground or
V
CC
if unused.
Power-Supply Bypassing and Grounding
The MAX6338 operates from a single +2.5V to +5.5V
supply. In noisy applications, connect a 0.1µF capaci-
tor on the supply voltage line close to V
CC
pin for
bypassing.
Chip Information
TRANSISTOR COUNT: 620
PROCESS: BiCMOS
MAX6338
Quad Voltage Monitor in µMAX Package
_______________________________________________________________________________________ 7
Figure 6. Setting the Auxiliary Monitor
Typical Operating Circuit
R1 = R2
(
- 1
)
V
INTH
1.23
V
REF
= 1.23V
R2
R1
V
INTH
MAX6338
IN1
IN2
IN3
IN4
OUT1
V
CC
OUT2
OUT3
OUT4
GND
SYSTEM
LOGIC
+2.5V TO +5.5V
(MAY BE ONE OF THE MONITORED VOLTAGES)
SUPPLIES
TO BE
MONITORED
µP