±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
meets Level 4 (the highest level) of IEC1000-4-2, with-
out the need for additional ESD-protection compo-
nents.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
lower in the IEC1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 7a shows the IEC1000-4-2 model and
Figure 7b shows the current waveform for the 8kV,
IEC1000-4-2, Level 4, ESD Contact-Discharge test.
The Air-Gap test involves approaching the device with
a charged probe. The Contact-Discharge method
connects the probe to the device before the probe is
energized.
Machine Model
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing.
MAX6816/MAX6817/MAX6818
MAX6818 µP Interfacing
The MAX6818 has an output enable (EN) input that
allows switch outputs to be three-stated on the µP data
bus until polled by the µP. Also, state changes at the
switch inputs are detected, and an output (CH) goes low
after the debounce period to signal the µP. Figure 4
shows the timing diagram for enabling outputs and read-
ing data. If the output enable is not used, tie
EN
to GND
to “always enable’’ the switch outputs. If
EN
is low,
CH
is
always high. If a change of state is not required, leave
CH
unconnected.
Pin Configurations (continued)
TOP VIEW
EN 1
IN1 2
IN2 3
IN1
1
6
OUT1
IN3 4
IN4 5
5
V
CC
IN5 6
IN6 7
IN2
3
4
OUT2
IN7 8
IN8 9
GND 10
20 V
CC
19 OUT1
18 OUT2
17 OUT3
GND
2
MAX6817
MAX6818
16 OUT4
15 OUT5
14 OUT6
13 OUT7
12 OUT8
11 CH
SOT23-6
SSOP
___________________Chip Information
MAX6816 TRANSISTOR COUNT: 284
MAX6817 TRANSISTOR COUNT: 497
MAX6818 TRANSISTOR COUNT: 2130
SUBSTRATE CONNECTED TO GND
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
