LS10 Series Switch
Debouncer/Noise-Rejection IC Users
Guide
General Description
The LogiSwitch LS10 Series of High Noise Immunity
Debouncer/Noise Filter ICs was designed for trouble-free
use in the most severe electrically hostile environments.
The LS10 Series of LogiSwitch debouncer/noise filter
chips features low-impedance 25 mA totem-pole outputs
for each channel. Outputs and inputs are of the same
polarity and may be selected for use as active high or
active low. The LS10 Series utilizes LogiSwitch’s
proprietary NoBounce™ technology resulting in a high
level of noise immunity. Noise spikes of less than 20 ms
duration are prohibited from starting or terminating a
cycle.
The input of each channel includes an internal pull-up resistor so the SPST interface
requires just one pin (NO or COM) tied to ground and the other to a channel input of the
device. All outputs are delayed for a period of 20 ms + bounce time on both activation and
release regardless of the bounce duration.
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Sept 2021
Device Information
Part Number
Channels
Package
Size Information
LS18-P
3
PDIP (8)
Plastic DIP 300 mil
LS18-S
3
SOIC (8)
Narrow SOIC 150 mil
LS19-P
6
PDIP (14)
Plastic DIP 300 mil
LS19-S
6
SOIC (14)
Narrow SOIC 150 mil
LS20-P
9
PDIP (20)
Plastic DIP 300 mil
LS20-S
9
SOIC (20)
Wide SOIC 300 mil
Pin Description LS18
2
Pin
Name
Function
1
VDD
+2.3 V to +5.5 V Supply Voltage
2
SW0
Normally Open Switch Input 0
3
SW1
Normally Open Switch Input 1
4
SW2
Normally Open Switch Input 2
5
OUT2
Normally High Output 2
6
OUT1
Normally High Output 1
7
OUT0
Normally High Output 0
8
VSS
Ground Reference (Switch
Common)
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Pin Description LS19
Pin
3
Name
Function
1
VDD
+2.3 V to +5.5 V Supply Voltage
2
SW0
Normally Open Switch Input 0
3
SW1
Normally Open Switch Input 1
4
SW2
Normally Open Switch Input 2
5
SW3
Normally Open Switch Input 3
6
SW4
Normally Open Switch Input 4
7
SW5
Normally Open Switch Input 5
8
OUTS
Normally High Output 5
9
OUT4
Normally High Output 4
10
OUT3
Normally High Output 3
11
OUT2
Normally High Output 2
12
OUT1
Normally High Output 1
13
OUTO
Normally High Output 0
14
VSS
Ground Reference (Switch Common)
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Pin Description LS20
Pin
Name
Function
1
VDD
+2.3 V to +5.5 V Supply
2
SWO
Voltage
Normally Open Switch
3
SW1
Input
0 Open Switch
Normally
4
SW2
Input
1 Open Switch
Normally
5
SW3
Input
2 Open Switch
Normally
6
SW4
Input
3 Open Switch
Normally
7
SW5
Input
4 Open Switch
Normally
8
SW6
Input
5 Open Switch
Normally
9
SW7
Input
6 Open Switch
Normally
10
SW8
Input
7 Open Switch
Normally
11
OUTS
Input
8 High Output 8
Normally
12
OUT7
Normally High Output 7
13
OUT6
Normally High Output 6
14
OUTS
Normally High Output 5
15
OUT4
Normally High Output 4
16
OUT3
Normally High Output 3
17
OUT2
Normally High Output 2
18
OUT1
Normally High Output 1
19
OUTO
Normally High Output 0
20
VSS
Ground Reference
(Switch Common)
4
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Simply Plug and Play
The LS10 Series of debouncer chips, like all LogiSwitch products, requires no external
clocks, additional components or math calculations based on the particular switch
application. The LogiSwitch advanced adaptive debounce architecture does it all!
LS10 Series Timing
Parameter
Min
Typ
t
bnc Bounce Time
0
0.2
t
dbnc Debounce Time
t
t
20
cltm Clean Time
Max
Units
ms
dbnc + t c l t m
20
20
ms
Electrical Specifications
Parameter
Operating Voltage
Range
Symbol
Conditions
Vcc
Supply Current - LS18
Supply Current - LS19
Supply Current - LS20
Input Pull-up Current
per Pin
Typ
2.5
Max
Unit
s
5.5
V
Icc
Vcc = 3.0 V, All Inputs
Open
1,000
1,550
µA
Icc
Vcc = 3.0 V, All Inputs
Open
2.1
2.6
mA
Icc
Vcc = 3.0 V, All Inputs
Open
2.1
2.6
mA
ipu
LS18
25
100
200
µA
25
120
200
µA
Input Pull-up Current
per Pin
ipu
LS19, LS20
Debounce Time
tdbnc
Vcc = 2.5 V to 5.5 V
5
Min
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ms
Logic Analyzer Capture of a LS10 Series IC Cycle
This logic analyzer capture of a LS10 Series IC cycle showing a noisy switch input
commonly applied to all six device channels. Note the initial 19 ms High-going glitch at
approximately +780 ms does not start a cycle, and the folHighing 18 ms high-going first
glitch at about approximately +915 ms does not terminate the cycle. LS10 Series devices
are designed to function flawlessly in severe electrical environments. These devices reject
any uninvited level transition of
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