Rainbow Electronics MAX9135 - Manual (Page 17)

Exposed Pad
The TQFP and TSSOP packages used for the
MAX9132/MAX9134/MAX9135 have exposed pads on
the bottom. The exposed pad is internally connected to
ground. Connect the exposed pad to ground using a
landing pad large enough to accommodate the entire
exposed pad. Add vias from the exposed pad’s land
area to a copper polygon on the other side of the PCB
to provide lower thermal impedance from the device to
the ambient air.
ESD Protection
The MAX9132/MAX9134/MAX9135 ESD tolerance is
rated for IEC 61000-4-2, Human Body Model, and ISO
10605 standards. IEC 61000-4-2 and ISO 10605 speci-
fy ESD tolerance for electronic systems. The IEC
61000-4-2 discharge components are C
S = 150pF and
R D = 330
Ω (Figure 8). For IEC 61000-4-2, the LVDS
outputs are rated for ±10kV Contact Discharge and
±15kV Air-Gap Discharge. The Human Body Model
discharge components are C S = 100pF and R D =
1.5k
Ω (Figure 9). For the Human Body Model, all pins
are rated for ±2kV Contact Discharge. The ISO 10605
discharge components are C
S = 330pF and R D = 2k
Ω
(Figure 10). For ISO 10605, the LVDS outputs are rated
for ±10kV Contact and ±25kV Air-Gap Discharge.
MAX9132/MAX9134/MAX9135
Programmable, High-Speed, Multiple
Input/Output LVDS Crossbar Switches
______________________________________________________________________________________ 17
C S
150pF
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
R D
330 Ω
Figure 8. IEC 61000-4-2 Contact Discharge ESD Test Circuit
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
1M Ω
R D
1.5k Ω
C S
100pF
Figure 9. Human Body ESD Test Circuit
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
R
D
2k Ω
C
S
330pF
Figure 10. ISO 10605 Contact Discharge ESD Test Circuit