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LogiSwitch LS120-S
- Part No.:
- LS120-S
- Manufacturer:
- LogiSwitch
- Category:
- Specialized ICs
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Description:
- IC SWITCH DEBOUNCER 20SOIC
- Quantity:
Unit Price:$3.41
Ext Price:$3.41
- Payment:
- Shipping:
Product Details
LS120-S - 9-Channel Switch Debouncer with Handshake
LogiSwitch LS120-S is a nine-channel NoBounce switch-interface IC in a wide 20-pin SOIC package. It provides adaptive contact debouncing and optional host acknowledgment on each channel.
The technical description follows LogiSwitch's LS100 Series user guide. Check the controlled revision and the exact design conditions before PCB release.
Overview
The LS120-S is the surface-mount, 20-pin wide-SOIC member of the LogiSwitch LS100 series. Its nine normally open switch inputs are paired with nine NL/HS output/handshake pins. Adaptive NoBounce logic removes contact bounce without external debounce capacitors or user-programmed timing components. A host can use each NL/HS pin as a normal active-high debounced output or acknowledge a service request through the documented handshake sequence.
Key Advantages
One device monitors nine normally open mechanical-switch inputs.
The internal NoBounce method adapts to switch bounce without external timing parts.
The NL/HS output changes promptly on actuation and release while contact bounce is suppressed.
A host acknowledgment can end a switch service cycle without repeated release polling.
Feature Summary
SW0 through SW8 feed corresponding NL/HS0 through NL/HS8 interface pins.
The guide's electrical-characteristics table specifies 2.5 V to 5.5 V operation.
NL/HS pins act as active-high outputs when handshake is not used.
The guide describes a 5 µs low-level ACK pulse and a response in the microsecond range.
Package & Footprint
The manufacturer identifies LS120-S as a 300 mil wide, 20-pin SOIC. LCDChip registers the package as 20-SOIC (0.295-inch / 7.50 mm width). Confirm the manufacturer's mechanical drawing, pin-one orientation and solder land pattern before layout release.
- Match the 300 mil body and lead pitch to the controlled drawing.
- Verify pin 1 and the nine input/output channel pairs.
- Check assembly and handling requirements for the purchased lot.
The registered package JPG is not present in the local site image directory. Supply and verify the image before publication.
Pin Functions
The manufacturer's LS120 pin table identifies VDD at pin 1, GND/VSS at pin 20, nine switch inputs on pins 2 through 10, and the paired NL/HS interface pins on pins 11 through 19 in reverse channel order.
Device supply.
Normally open switch inputs, one per channel.
Normally low outputs and optional handshake inputs.
Ground and switch common reference.
Check the manufacturer's drawing before routing; the channel sequence is mirrored across the package.
Key Specifications
| Manufacturer | LogiSwitch |
|---|---|
| Exact ordering code | LS120-S |
| Function | Adaptive mechanical-switch debouncer with optional handshake |
| Channels | 9 |
| Supply voltage | 2.5 V to 5.5 V, per guide electrical-characteristics table |
| Package | 20-pin wide SOIC, 300 mil nominal |
| Mounting | Surface mount |
| Input-to-output time | 4 µs min, 12 µs typ, 20 µs max, per guide timing table |
| Clean time | 20 ms, per guide timing table |
| ACK pulse duration | 5 µs, per guide timing table |
| ACK response | 6 µs min, 8 µs typ, 12 µs max, per guide timing table |
| Supply current | 2.1 mA typ, 2.6 mA max at VCC = 3.0 V with all inputs open |
| Switch-input pull-up current | 120 µA typ, 25–200 µA range per pin for LS119/LS120 |
The user guide lists differing temperature limits in its operating-conditions and electrical-characteristics tables. Confirm the applicable range with LogiSwitch for the intended design; no unqualified temperature claim is made here.
Replacement Considerations
Compare channel count, supply and logic levels, handshake behavior, debounce timing, pin mapping, package geometry and firmware interaction before considering any substitute. Other LS100 family members have different channel counts or through-hole packages and are not assumed pin-compatible. No unverified LCDChip internal product is linked as a replacement.
Manufacturer Information
LogiSwitch's LS100 Series NoBounce ICs with Handshake user guide identifies the LS120-S ordering code, nine-channel function, wide SOIC package, electrical characteristics and physical pin functions. Its LS120-S product page describes the same switch-debouncing and handshake functions. Review the latest controlled manufacturer documentation before qualification.
Applications
Condition several independent pushbutton inputs for a host controller.
Reduce contact-bounce handling in embedded input firmware.
Use the handshake option when the host service routine benefits from acknowledgment.
Aggregate up to nine mechanical contacts after voltage and environment review.
Quality & Authenticity
Match the complete LS120-S ordering code and 20-pin SOIC body to the purchase order. Confirm supplier traceability, lot markings and storage history before assembly. Distributor availability is a listing and does not establish qualification of a specific production lot.
FAQ
How many switches can LS120-S monitor?
The manufacturer specifies nine independent switch channels.
Must the handshake be used?
No. The NL/HS pins function as active-high debounced outputs when the host does not use acknowledgment.
Does it require external debounce components?
The manufacturer's adaptive NoBounce method is designed to avoid external debounce timing components.
Is the package image ready?
No. The registered 20-SOIC JPG must be supplied and checked before this draft can be published.
Engineering Notice
Verify the controlled LogiSwitch documentation, physical drawing, host logic levels, switch wiring and acknowledgment timing against the actual design. Resolve the manufacturer's temperature-table discrepancy for the intended environment. The registered package JPG is missing, so this product page must remain under manual review and unpublished.
LS120-S Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- LogiSwitch
- Series:
- LS100
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Box
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Switch Debouncer
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
- Grade:
- -
- Qualification:
- -
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