MAX6817 MAXIM [Maxim Integrated Products], MAX6817 Datasheet - Page 5

• Manufacturer Part Number: MAX6817
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 2. Input Characteristics
Figure 3. Switch Input ±25V Fault Tolerance
The switch inputs on the MAX6816/MAX6817/MAX6818
have overvoltage clamping diodes to protect against
damaging fault conditions. Switch input voltages
can safely swing ±25V to ground (Figure 3). Proprietary
ESD-protection structures protect against high
ESD encountered in harsh industrial environments,
membrane keypads, and portable applications.
They are designed to withstand ±15kV per the
IEC1000-4-2 Air Gap Discharge Test and ±8kV per the
IEC1000-4-2 Contact Discharge Test.
Since there are 63kΩ (typical) pull-up resistors con-
nected to each input, driving an input to -25V will draw
(20V/div)
(2V/div)
OUT1
OUT2
IN1
IN2
OUT
IN
CH
-20V
20V
4V
0
0
±15kV ESD-Protected, Single/Dual/Octal,
_______________________________________________________________________________________
MAX6818 ONLY
20ms/div
t
Robust Switch Inputs
DP
CMOS Switch Debouncers
approximately 0.5mA (up to 4mA for eight inputs) from
the V
approximately 0.32mA of current (up to 2.6mA for eight
inputs) to flow back into the V
tem V
back into the V
levels. In some low-current systems, a zener diode on
V
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX6816/MAX6817/MAX6818 have
extra protection against static electricity. Maxim's engi-
neers have developed state-of-the-art structures to pro-
tect against ESD of ±15kV at the switch inputs without
Figure 4. MAX6818 µP-Interface Timing Diagram
Figure 5. MAX6818 Typical µP Interfacing Circuit
EN
OUT1–OUT8
OUT1–OUT8
CH
CC
may be required.
SW1
SW8
CC
CC
supply. Driving an input to +25V will cause
supply current is less than the current flowing
1 /2
IN1
IN8
V
CC
CC
t
t
t
MAX6818
PC
PE
PE
supply, V
+V
CC
1 /2
1 /2
1 /2
V
V
V
CC
CC
CC
±15kV ESD Protection
OUT NORMALLY
t
OUT NORMALLY
EN
OUT1
OUT8
CC
CC
CH
EN
0.1 F
LOW
HIGH
will rise above normal
supply. If the total sys-
I/O
IRQ
D0
D7
1 /2
t
t
V
PD
PD
+V
V
V
CC
OL
OH
CC
P
+ 0.5V
- 0.5V
5