±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
__________Applications Information
Because the MAX1406 is not sensitive to power-supply
sequencing, no external protection diodes are required.
Any of the three supplies can power up first. However,
use proper layout techniques to ensure other devices
on your board are not damaged in case of an ESD
event.
• Minimize the ground-lead return path to the power
supply, because currents as high as 60A can pass
into the ground.
• Use a separate return path to the power supply.
• Make trace widths greater than 40 mils.
• Bypass V
CC,
V
DD,
and V
SS
with 0.1µF capacitors as
close to the MAX1406 as possible to ensure maxi-
mum ESD protection.
• Tie any unused transmitter inputs to GND or V
CC
to
minimize power consumption.
___________________Chip Topography
0.094"
(2.38mm
)
V
DD
V
CC
R1IN
R1OUT
MAX1406
T1
OUT
R2IN
T1IN
R2OUT
T2IN
0.153"
T2OUT
(3.89mm)
R3OUT
R3IN
T3OUT
T3IN
V
SS
GND
TRANSISTOR COUNT: 161
SUBSTRATE CONNECTED TO GND
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
