Rainbow Electronics MAX6338 - Manual (Page 7)

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 = 100k Ω), R1 =
265k
Ω.
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