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LSI/CSI LS7084N
- Part No.:
- LS7084N
- Manufacturer:
- LSI/CSI
- Category:
- Specialized ICs
- Package:
- 8-DIP (0.300", 7.62mm)
- Description:
- IC CLOCK CONVERTER 8DIP
- Quantity:
Unit Price:$4.28
Ext Price:$4.28
- Payment:
- Shipping:
Product Details
LS7084N - Quadrature Clock and Direction Converter
LSI/CSI LS7084N converts A/B quadrature encoder signals into a clock and an Up/Down direction output in an 8-pin, 300 mil DIP through-hole package.
The exact DIP order code and pin functions are listed in the LSI/CSI LS7083N/LS7084N manufacturer datasheet.
Overview
LS7084N is a CMOS quadrature clock converter for incremental optical or magnetic encoder interfaces. Its A and B inputs are filtered on chip and translated to CLK pulses plus an UP/DN direction level for a connected counter. Unlike LS7083N, which provides separate up-clock and down-clock outputs, LS7084N combines those events into one clock line and a direction indication.
Key Advantages
Generates CLK and UP/DN outputs from two quadrature inputs.
The MODE input selects x1, x2 or x4 decoding as documented by the manufacturer.
Input validation helps reject encoder dither in optical or magnetic sensing.
An external resistor on RBIAS sets output clock pulse width.
Feature Summary
DC electrical characteristics specify 3 V to 12 V across VDD and VSS.
MODE low selects x1, floating selects x2 and high selects x4 resolution.
Manufacturer describes TTL- and CMOS-compatible I/O.
The manufacturer product page lists up to 16 MHz output clock frequency; allowable A/B input timing depends on the selected mode and validation delay.
Package & Footprint
The unsuffixed LS7084N is the 8-pin plastic DIP variant with a 300 mil body. LCDChip registers the matching 8-DIP (0.300 inch, 7.62 mm) package. LS7084N-S is a surface-mount SOIC variant with a different footprint.
- Use the LSI/CSI DIP outline drawing for drill and row spacing.
- Identify pin 1 from the manufacturer's top-view pin assignment.
- Do not substitute the SOIC land pattern for the DIP footprint.
The registered 8-DIP JPG is not present locally. The expected path is retained for a later verified package image.
Pin Functions
The LSI/CSI LS7084N pin table identifies these functions for the 8-pin device.
Connect an external resistor to VSS to set output clock pulse width.
Positive and negative supply terminals, respectively.
Quadrature encoder clock inputs.
Three-state resolution selection: low x1, float x2, high x4.
High when A leads B; low when A lags B.
Combined clock output for both count directions.
Observe the manufacturer's rising-edge counting requirement for CLK.
Key Specifications
| Manufacturer | LSI/CSI |
|---|---|
| Exact ordering code | LS7084N |
| Function | Quadrature A/B to CLK and UP/DN conversion |
| Package | 8-pin, 300 mil DIP; registered 8-DIP |
| DC supply range | 3 V minimum to 12 V maximum in the electrical-characteristics table |
| Characterization temperature | -20 to +85 degrees C in the manufacturer's DC and transient tables |
| Resolution selections | x1, x2 and x4 using the three-state MODE input |
| Output clock capability | Up to 16 MHz, manufacturer product-page feature |
| RBIAS resistor | 2 kilohms to 10 megohms in the electrical-characteristics table |
| Supply current | 1.5 mA typical, 1.65 mA maximum at VDD = 12 V, zero input frequency and RBIAS = 2 megohms |
| Output pulse width | 180 ns typical at VDD = 5 V under the datasheet timing conditions |
| Input-to-output delay | 220 ns typical, 345 ns maximum at VDD = 5 V under the transient-characteristics conditions |
| Mounting | Through hole |
Output pulse width depends on RBIAS and must not exceed the A/B pulse separation specified by the manufacturer.
Replacement Considerations
LS7084N-S is the manufacturer-listed SOIC package variant with the same clock/direction function, but it needs a surface-mount footprint. LS7083N shares the 8-pin DIP family but produces separate UPCK and DNCK outputs instead of LS7084N's CLK and UP/DN signals; it requires a different counter interface. Exact catalog records exist for both candidates, but their pages are currently unpublished, so no internal links are added. Neither is presented as a drop-in replacement.
Manufacturer Information
LSI/CSI lists LS7084N among its in-production quadrature clock decoders and supplies the pin assignment, electrical characteristics and DIP outline in its LS7083N/LS7084N datasheet. Confirm current revision and ordering details before procurement.
Applications
Convert optical or magnetic quadrature outputs into count and direction signals.
Drive an up/down counter for direction and position sensing.
Interface rotary encoders with digitally controlled systems.
Provide filtered clock and direction information to control electronics.
Quality & Authenticity
Check the exact LS7084N order code, DIP body, pin-1 mark and traceability records on receipt. Validate electrical behavior against the current LSI/CSI datasheet and obtain lot or compliance documentation as the application requires.
FAQ
What outputs does LS7084N provide?
It provides a combined CLK output and an UP/DN direction indication.
How is x2 resolution selected?
The manufacturer specifies a floating MODE input for x2; low selects x1 and high selects x4.
Is LS7084N-S the same footprint?
No. LS7084N-S is a surface-mount SOIC, while LS7084N is a through-hole DIP.
Which CLK edge should the counter use?
The manufacturer directs LS7084N counter interfaces to count on the rising edge of CLK.
Engineering Notice
This summary does not replace the controlled LSI/CSI datasheet. Verify RBIAS selection, A/B timing, MODE biasing, supply limits and rising-edge counting before design release. The registered package JPG has not yet been verified online.
LS7084N Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- LSI/CSI
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock Converter
- Applications:
- Interface
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
- Grade:
- -
- Qualification:
- -
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