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Texas Instruments SN65HVS885PWP
- Part No.:
- SN65HVS885PWP
- Manufacturer:
- Texas Instruments
- Category:
- Serializers, Deserializers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN65HVS885PWP.pdf
- Description:
- IC SERIALIZER 1MBPS 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,677
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Product details
Overview
SN65HVS885 from Texas Instruments is an eight-channel digital-input serializer for industrial 5-V systems, accepting field inputs up to 34 V, providing SPI-compatible serial output (SOP), integrated 0–3 ms selectable debounce, and on-chip overtemperature flag (HOT). It enables high-density digital input modules in PLCs and I/O cards with galvanic isolation support.
For engineers reviewing the SN65HVS885 datasheet, SN65HVS885 pinout, SN65HVS885 application, or SN65HVS885 equivalent, key selection considerations include input current limit tuning via RLIM, debounce configuration via DB0/DB1, thermal shutdown thresholds (150°C/170°C), and cascading capability for >8-channel systems without additional controller I/O.
Technical Context
The SN65HVS885 implements a parallel-in, serial-out shift register with two distinct functional modes: Load Mode (LD low) latches all eight field inputs (IP0–IP7) simultaneously, while Shift Mode (LD high, CE low) clocks data out serially on SOP at CLK rising edges. Input current limiting is set by external RLIM resistor (17–500 kΩ), establishing precise ILIM from 0.2 mA to 5.2 mA per channel using internal 90-V reference.
Debounce filtering operates independently per channel using analog/digital hybrid timing controlled by DB0/DB1 logic levels (0/1/3 ms), and field input thresholds (VTH+(IN) = 9.4–10 V, VTH–(IN) = 6–8.4 V) are configurable via external RIN to comply with IEC61131-2 Type 1/2/3 switch standards. The HOT pin asserts low at 150°C and enters high-impedance at 170°C for fail-safe system response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 0 V to 34 V on IP0–IP7; supports direct connection to 24-V industrial field wiring without external level-shifting. |
| Input current limit | 0.2 mA to 5.2 mA per channel; set precisely by single external RLIM resistor (17–500 kΩ), enabling compliance with IEC61131-2 power budgets. |
| Debounce time | Selectable 0 ms (bypassed), 1 ms, or 3 ms via DB0/DB1 logic states; eliminates mechanical contact bounce in proximity switches and pushbuttons. |
| Serial interface | SPI-compatible with LD, CLK, CE, SIP, SOP; 8-bit parallel load + serial shift enables microcontroller integration with minimal GPIO usage. |
| Thermal protection | HOT pin pulls low at 150°C (overtemperature warning) and goes high-impedance at 170°C (shutdown); includes internal 100-kΩ pulldown for reliable fault signaling. |
| ESD rating | ±15-kV HBM on field inputs (IP0–IP7); meets industrial immunity requirements without added external TVS diodes. |
| Operating temperature | –40°C to +125°C ambient; specified for extended life in cabinet-mounted industrial controllers and distributed I/O nodes. |
Pinout & Package
The SN65HVS885 is housed in a 28-pin HTSSOP (PWP) package with exposed thermal pad (9.70 mm × 4.40 mm), optimized for heat dissipation in high-density I/O modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IP0–IP7 | Field digital input channels | Current-limited, high-voltage (up to 34 V) inputs; each accepts industrial sensor/switch signals with programmable trip points via RIN. |
| RE0–RE7 | LED return path outputs | Constant-current sinks (2.8–3.5 mA typical) for driving external status LEDs; enables visual diagnostics without external drivers. |
| DB0, DB1 | Debounce select inputs | Logic-controlled configuration pins (internally pulled high) that set per-channel debounce time: 0/1/3 ms; unused pins should be tied to 5 V. |
| LD | Load pulse input | Active-low control that latches all eight IPx states into the internal shift register; must be held low during parallel sampling. |
| CLK, CE | Serial clock and enable | CLK rising edge shifts data when CE is low; CE high inhibits shifting - enables multi-device daisy-chaining synchronization. |
| SIP, SOP | Serial data in/out | SIP accepts data for first register stage; SOP outputs serialized 8-bit stream - allows cascading multiple SN65HVS885 devices via single controller port. |
| HOT | Overtemperature flag | Open-drain output asserting low at 150°C; transitions to high-impedance at 170°C - provides fail-safe thermal monitoring for safety-critical I/O. |
| RLIM | Current limit reference | Connects external precision resistor to set full-scale input current (ILIM = 90 V / RLIM); enables accurate compliance with IEC61131-2 Type 1/2/3. |
| VCC, GND | 5-V supply and ground | Single 5-V rail powers logic and input stages; exposed thermal pad requires PCB copper pour for junction-to-board thermal resistance of 15 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Eight high-voltage digital inputs | Accepts 34-V field signals directly; eliminates need for discrete voltage dividers or optocoupler front-ends in 24-V PLC input modules. |
| Configurable input current limit | Single RLIM resistor sets identical 0.2–5.2 mA limit across all eight channels - ensures consistent IEC61131-2 Type 1/2/3 compliance and predictable power dissipation. |
| Programmable per-channel debounce | 0/1/3 ms filtering selected via two logic pins - suppresses contact bounce in mechanical sensors without firmware overhead or external RC networks. |
| Integrated LED drive outputs | Eight constant-current REx terminals (2.8–3.5 mA) enable direct connection of status LEDs - reduces BOM count and simplifies panel-mount I/O indicator design. |
| Daisy-chain capable serial interface | SOP-to-SIP cascading supports arbitrary channel counts (e.g., 32-channel with four devices) using only three controller GPIOs (CLK, CE, LD) and one data line. |
Applications
| Industrial PLC Digital Input Module | Decentralized I/O Node |
|---|---|
Use Scenario: Rack-mounted PLC backplane receiving 24-V dry-contact status from motors, valves, and limit switches in factory automation. IC Role / Device Role / Timing Role: SN65HVS885 acts as the field-side serializer, converting eight parallel 24-V inputs into a single SPI-compatible serial stream for isolated transmission to the controller CPU. Use Value: Reduces isolation component count by 7× versus discrete optocouplers; enables hot-swap-capable modular I/O with standardized 8-channel slices. | Use Scenario: DIN-rail mounted remote I/O unit collecting sensor data from conveyor belt photoelectric switches and emergency stop buttons. IC Role / Device Role / Timing Role: SN65HVS885 serves as the primary digital input conditioner, providing ESD-hardened, debounced, current-limited acquisition before isolation and CAN/RS-485 uplink. Use Value: Meets IEC61000-4-2 ±15-kV HBM and IEC61131-2 Type 3 thresholds natively - eliminates external protection components and calibration effort. |
| High-Density Industrial PC I/O Card | Building Automation System Input Hub |
Use Scenario: PCIe-based industrial computer adding 64 digital inputs via four cascaded SN65HVS885 devices on a single expansion card. IC Role / Device Role / Timing Role: Each SN65HVS885 performs parallel load (LD strobe) followed by 8-bit serial shift (CLK/CE) - synchronized by host FPGA to achieve deterministic 1-ms input update latency. Use Value: Achieves 64-channel density in half-height form factor; leverages single SPI bus to minimize routing congestion and signal integrity risk. | Use Scenario: Central HVAC controller monitoring occupancy sensors, door contacts, and fire alarm panel dry contacts across multi-floor commercial buildings. IC Role / Device Role / Timing Role: SN65HVS885 functions as the field interface ASIC, translating 34-V building management system voltages into safe 5-V logic levels for microcontroller polling. Use Value: Supports long cable runs (≥100 m) with robust noise immunity; HOT pin integration enables predictive maintenance alerts before thermal derating occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital-input serializer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14912 | Octal industrial digital input with integrated 36-V protection, but uses parallel 8-bit output (no serial interface); requires more MCU GPIOs. | Best suited for space-constrained designs where serial interface is unnecessary and board area permits wider parallel bus routing. | Choose MAX14912 when minimizing external components outweighs serial bus efficiency and daisy-chaining is not required. |
| AD7403 | Isolated sigma-delta modulator (not a serializer); outputs 1-bit stream at 20-MHz rate requiring DSP demodulation - no native debounce or LED drive. | Targeted at high-resolution analog sensing (e.g., motor current), not discrete digital input conditioning. | Select AD7403 only for precision analog acquisition; it does not replace SN65HVS885's digital input, debounce, or LED functionality. |
Compared with MAX14912 and AD7403, the SN65HVS885 uniquely combines 34-V tolerant inputs, programmable debounce, LED drive outputs, and SPI-compatible serial output in a single 28-pin package - making it optimal for cost-sensitive, high-channel-count industrial digital input modules requiring minimal controller resource usage.
Availability
SN65HVS885 is available at Aetrix Electronics and suitable for industrial PLCs, decentralized I/O nodes, high-density industrial PC I/O cards, and building automation system input hubs requiring stable component supply across extended product lifecycles.
Supply support for SN65HVS885 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN65HVS885 belongs to TI's industrial interface portfolio, designed specifically to simplify high-voltage digital input acquisition in programmable logic controllers, distributed I/O systems, and factory automation equipment.
FAQ
What is the maximum field input voltage supported by the SN65HVS885?
The SN65HVS885 supports field input voltages up to 34 V on pins IP0 through IP7, with absolute maximum rating of 36 V. This allows direct interfacing with standard 24-V industrial control systems and accommodates transient surges common in factory environments. Operation above 34 V risks exceeding recommended conditions and may degrade long-term reliability.
How do I configure the debounce time on the SN65HVS885?
Debounce time on the SN65HVS885 is configured using the logic states of DB0 and DB1 pins: open/open = 3 ms, open/GND = 1 ms, GND/open = 0 ms (filter bypassed). Both pins are internally pulled high, so unused configurations should be tied to 5 V to prevent floating. The selected time applies identically to all eight input channels.
Can the SN65HVS885 drive LEDs directly, and what current does it provide?
Yes, the SN65HVS885 drives LEDs directly via its eight RE0–RE7 terminals, each delivering a constant current of 2.8–3.5 mA (typical) when RLIM = 25 kΩ. These outputs sink current to ground, allowing simple connection of anode-to-VCC LEDs. No external current-limiting resistors are needed, reducing BOM count and layout complexity.
What happens to the SN65HVS885 when junction temperature exceeds 170°C?
When the SN65HVS885 junction temperature reaches 170°C, the HOT pin transitions to high-impedance state and all output drivers (RE0–RE7, SOP) enter high-impedance mode - effectively disabling the device to prevent thermal damage. At 150°C, HOT asserts low as a warning signal. An internal 100-kΩ pulldown maintains a logic-low level at HOT during this transition for reliable system detection.
How many SN65HVS885 devices can be cascaded, and what interface changes are required?
Multiple SN65HVS885 devices can be cascaded indefinitely by connecting SOP of one device to SIP of the next. Only three control lines (LD, CLK, CE) and one data line (SIP/SOP chain) are needed regardless of count. For N devices, 8×N clock pulses are required to read all inputs - no PCB or firmware changes beyond extending the clock count are necessary.
SN65HVS885PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Serializer
- Data Rate:
- 1Mbps
- Input Type:
- Parallel
- Output Type:
- Serial
- Number of Inputs:
- 8
- Number of Outputs:
- 1
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
SN65HVS885PWP FAQ
1.How can I place an order for SN65HVS885PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65HVS885PWP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN65HVS885PWP reliable?
The price and inventory of SN65HVS885PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65HVS885PWP is usually 5 days.
3.What payment methods are accepted for SN65HVS885PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65HVS885PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65HVS885PWP?
SN65HVS885PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65HVS885PWP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN65HVS885PWP?
For technical support, including SN65HVS885PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65HVS885PWP requirements.
6.How does Aetrix verify that SN65HVS885PWP is sourced from the original manufacturer or authorized distributors?
All SN65HVS885PWP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN65HVS885PWP meets industry standards.
7.What is the process for return or replacement of SN65HVS885PWP?
All SN65HVS885PWP units undergo pre-shipment inspection (PSI). If there is an issue with SN65HVS885PWP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN65HVS885PWP part is unused and in its original packaging.
Return procedure for SN65HVS885PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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