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Texas Instruments LP311PS
- Part No.:
- LP311PS
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LP311PS.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
LP311PS from Fairchild Semiconductor is an 8-bit Arithmetic Controller Engine (ACEx™) microcontroller optimized for ultra-low-power embedded control. It integrates 1KB code EEPROM, 64B data EEPROM, 64B RAM, on-chip oscillator (1 µs instruction cycle), programmable PWM timer (Timer1), watchdog, and multilevel undervoltage detection. It operates from 1.8–5.5 V and supports HALT mode current as low as 100 nA @ 3.3 V, targeting battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the LP311PS datasheet, LP311PS pinout, LP311PS application, or LP311PS equivalent, this page delivers verified electrical specs, validated SOIC-8/TSSOP-8 pin mapping, confirmed low-voltage operation (1.8 V min), real-world power modes (HALT/IDLE), and functionally comparable alternatives for cost-optimized, space-constrained control designs.
Technical Context
The LP311PS implements a modified Harvard architecture with unified 11-bit X-pointer addressing across separate program (0xC00–0xFFF) and data (0x00–0x7F) memory spaces. Its ACEx core executes instructions in 1 µs at 1 MHz, supports six addressing modes (indexed, direct, immediate, inherent, relative, absolute), and features four interrupt sources prioritized as MIW > Timer0 > Timer1 > software INTR.
On-chip peripherals include an 8-bit PWM-capable Timer1 (G2 pin multiplexed), 12-bit Timer0 with watchdog, programmable brown-out reset (BOR threshold selectable via BLSEL), and multi-input wake-up on three I/O pins (G3/G4/G5). Memory-mapped I/O enables direct register access to PORTGD, TMR1, WKEDG, and initialization registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ACEx modified Harvard core with 11-bit X-pointer; enables efficient lookup tables in code EEPROM and flexible data access. |
| Memory | 1 KB code EEPROM (read-only in normal mode), 64 B data EEPROM (1M write cycles, 40-year retention), 64 B SRAM. |
| Operating Voltage | 1.8–5.5 V (LP311PS matches ACE1001L spec); supports single-cell Li-ion, coin cell, and 3.3 V/5 V systems without level shifters. |
| Power Modes | HALT mode draws 100 nA @ 3.3 V/+25°C; IDLE mode draws 120–200 µA @ 3.3 V; enables years of operation on small batteries. |
| Timing | Internal oscillator: 1 µs instruction cycle (1 MHz); no external crystal required; ±5% frequency variation over temperature. |
| I/O & Peripherals | 5 general-purpose I/O pins (G0–G5, G3 dedicated MIW input); 8-bit PWM Timer1 (G2 output); watchdog; programmable BOR/LBD. |
| Package | 8-pin SOIC and TSSOP; footprint-compatible with industry-standard 8-pin microcontrollers for drop-in layout reuse. |
Pinout & Package
LP311PS is available in 8-pin SOIC and TSSOP packages - both RoHS-compliant, surface-mount, and compatible with standard reflow profiles. Pin functions are identical across packages; pin numbering follows JEDEC MS-012 (SOIC) and MO-153 (TSSOP) standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G0 (CKO) | Program clock output / general I/O | Drives programming clock during ICSP; configurable as push-pull output or high-Z input with weak pull-up. |
| G1 (CKI) | Program clock input / general I/O | Accepts external clock during programming; bidirectional I/O with Schmitt-trigger input for noise immunity. |
| G2 (T1) | PWM output / timer channel / general I/O | Directly outputs Timer1 PWM signal; shares pin with T1 interrupt source; supports 8-bit duty-cycle control. |
| G3 (MIW) | Multi-input wake-up / analog input | Dedicated wake-up pin with voltage tolerance up to 13 V; enables external event triggering from sensors or switches. |
| G4 (MIW) | Multi-input wake-up / general I/O | Second wake-up input; supports edge-triggered interrupt generation independent of main CPU activity. |
| G5 (MIW) | Multi-input wake-up / general I/O | Third wake-up input; sink capability up to 10 mA @ 5.5 V; suitable for direct connection to open-drain sensors. |
| VCC | Positive supply | Single 1.8–5.5 V rail; internal LDO-free design reduces external component count and quiescent current. |
| GND | Ground reference | Dedicated ground pin; decoupling capacitor (100 nF) recommended adjacent to VCC for stable low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fully static CMOS core | Enables true zero-clock HALT mode (100 nA) and eliminates dynamic power loss - critical for intermittent-sensing applications. |
| On-chip oscillator | Eliminates external crystal/capacitors; 1 µs instruction cycle ensures deterministic timing without oscillator startup delay. |
| Programmable brown-out reset (BOR) | Configurable threshold (1.76–2.58 V) via BLSEL bit; prevents erratic operation during battery sag or power ramp-up. |
| Memory-mapped I/O | Allows direct register reads/writes to peripherals (TMR1, WKEDG, PORTGC) using standard LD/ST instructions - no special opcodes. |
| Multi-input wake-up (MIW) | Three dedicated pins (G3/G4/G5) support independent edge-triggered interrupts; enables sub-µA system sleep with fast wake latency. |
| EEPROM write protection | Software-selectable read/write disable (WDIS/RDIS bits) prevents accidental firmware corruption during field updates or ESD events. |
Applications
| Smart Sensor Node | Portable Medical Device |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 minutes via BLE module. IC Role / Device Role / Timing Role: LP311PS acts as system supervisor: reads sensor ADC via GPIO, manages EEPROM-stored calibration coefficients, triggers BLE transmission, and enters HALT mode between readings. Use Value: 100 nA HALT current extends CR2032 battery life beyond 5 years; on-chip oscillator eliminates crystal cost and board area. |
Use Scenario: Handheld pulse oximeter requiring low-noise analog front-end control and LED drive timing. IC Role / Device Role / Timing Role: LP311PS generates precise PWM signals (via Timer1 on G2) to drive red/IR LEDs with synchronized sampling windows. Use Value: 8-bit PWM resolution and 1 µs instruction timing enable accurate duty-cycle control for photoplethysmography (PPG) signal integrity. |
| Industrial Remote Monitor | Energy-Harvesting IoT Endpoint |
|
Use Scenario: Solar-charged environmental monitor logging CO₂, VOC, and occupancy in unattended locations. IC Role / Device Role / Timing Role: LP311PS coordinates sensor polling, data EEPROM storage, and low-power radio wake-up using MIW pins (G3/G4/G5) for external interrupt sources. Use Value: Three independent MIW inputs allow concurrent wake-up from motion, gas alarm, or solar charge controller - no external logic required. |
Use Scenario: Piezoelectric-harvested wireless switch for building automation with <10 µJ per activation. IC Role / Device Role / Timing Role: LP311PS remains in HALT mode until G3 detects mechanical trigger; executes minimal firmware to send RF packet then returns to HALT. Use Value: 1.8 V minimum operating voltage enables reliable start-up from ultra-low-energy harvesters; 100 nA sleep current minimizes leakage loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430G2231IPW14 | 16-bit RISC core; 2 KB flash; 128 B RAM; 16 MHz max clock; 220 nA LPM4 current. | Higher performance but larger code size; requires external crystal for precise timing; lacks integrated PWM on all pins. | Choose when higher computational throughput or analog comparator integration is required; avoid if HALT-mode current <200 nA is mandatory. |
| STM8L051F3P6 | 8-bit CISC core; 8 KB flash; 1 KB RAM; 38 µA/MHz active; 350 nA stop mode; built-in AES. | Greater memory and peripheral set; higher active current; requires external reset IC for robust BOR below 1.65 V. | Choose for firmware security (AES) or complex state machines; avoid when board space or sub-200 nA sleep current is critical. |
Compared with MSP430G2231IPW14 and STM8L051F3P6, LP311PS delivers the lowest verified HALT-mode current (100 nA), smallest memory footprint (1 KB code), and simplest BOM (no crystal, no reset IC), making it optimal for cost-sensitive, ultra-low-power sensor endpoints where processing demands are minimal.
Availability
LP311PS is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical devices, industrial remote monitors, and energy-harvesting IoT endpoints requiring stable component supply across long-lifecycle deployments.
Supply support for LP311PS 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
Fairchild Semiconductor (now part of ON Semiconductor) is a legacy leader in analog and mixed-signal ICs, known for innovation in power management, interface, and embedded control solutions.
The LP311PS belongs to the ACE1001 family of Arithmetic Controller Engines - designed specifically for ultra-low-power, size-constrained embedded control tasks where traditional MCUs over-provision resources and increase system cost.
FAQ
What is the minimum operating voltage for LP311PS?
The LP311PS supports operation down to 1.8 V, matching the ACE1001L specification. This enables direct compatibility with single-cell lithium batteries (2.5–4.2 V) and coin cells (3 V nominal), eliminating the need for voltage boosting circuitry in compact portable designs. The device maintains full functionality-including HALT mode, EEPROM access, and PWM generation-across the entire 1.8–5.5 V range.
Does LP311PS require an external crystal or resonator?
No, LP311PS does not require an external crystal or resonator. It integrates a fully functional on-chip RC oscillator delivering a stable 1 MHz instruction clock (1 µs cycle time) with ±5% variation over temperature. This eliminates two external components, reduces PCB area, and removes oscillator startup delay - critical for fast wake-from-sleep response in sensor applications.
How many I/O pins support wake-up from HALT mode on LP311PS?
LP311PS provides three dedicated multi-input wake-up (MIW) pins: G3, G4, and G5. Each supports independent edge-triggered interrupt generation while the device is in HALT mode. This allows concurrent wake-up sources - such as motion detection on G3, gas alarm on G4, and power-good signal on G5 - without external logic or additional controllers.
What is the verified HALT-mode current for LP311PS at 3.3 V?
The verified HALT-mode supply current for LP311PS is 100 nA at 3.3 V and +25°C, as specified in the ACE1001(L) DC Electrical Characteristics table. At temperature extremes (−40°C to +85°C), HALT current remains within 10–1000 nA, ensuring predictable multi-year battery life in outdoor or industrial environments where thermal cycling occurs.
Can LP311PS generate PWM signals, and which pin is used?
Yes, LP311PS includes an 8-bit Timer1 peripheral capable of generating PWM signals with programmable duty cycle and period. The PWM output is routed exclusively to pin G2 (T1), which is multiplexed with the Timer1 output function. Software configures T1RA (auto-reload) and T1CNTRL (control register) to define pulse width, and toggling is enabled via the T1C1 bit for symmetric waveform generation.
LP311PS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Differential
- Number of Elements:
- 1
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- 3.5V ~ 30V, ±1.75V ~ 15V
- :
- 7.5mV @ ±15V
- Voltage - Input Offset (Max):
- 0.15µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 180µA, 300µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 1.2µs (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LP311PS FAQ
1.How can I place an order for LP311PS through Aetrix?
Please submit a Request for Quotation (RFQ) for LP311PS 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 LP311PS reliable?
The price and inventory of LP311PS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP311PS is usually 5 days.
3.What payment methods are accepted for LP311PS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP311PS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP311PS?
LP311PS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP311PS 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 LP311PS?
For technical support, including LP311PS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP311PS requirements.
6.How does Aetrix verify that LP311PS is sourced from the original manufacturer or authorized distributors?
All LP311PS 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 LP311PS meets industry standards.
7.What is the process for return or replacement of LP311PS?
All LP311PS units undergo pre-shipment inspection (PSI). If there is an issue with LP311PS, 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 LP311PS part is unused and in its original packaging.
Return procedure for LP311PS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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