LS19-S

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. www.logiswitch.com info@logiswitch.com 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) info@logiswitch.com www.logiswitch.com 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) info@logiswitch.com www.logiswitch.com 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 info@logiswitch.com www.logiswitch.com 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 info@logiswitch.com 21 www.logiswitch.com 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