PCF8563BS/4,118 - 1mA I2C RTC | 400kHz | HVSON-10 | NXP
Référence : PCF8563BS/4,118 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.2 | $1,20 |
| 10 | $1.08 | $10,80 |
| 100 | $0.95 | $95,00 |
| 500 | $0.85 | $425,00 |
| 1 000 | $0.76 | $760,00 |
PCF8563BS/4,118 Présentation
What is an RTC? A Real-Time Clock is a dedicated integrated circuit that maintains accurate wall-clock time (date and time) independent of the main system processor, typically referenced to a 32.768 kHz quartz crystal. RTCs sit hierarchically as follows: RTC -> clock/calendar IC -> timing device -> mixed-signal IC -> semiconductor. Unlike software-based timekeeping derived from a microcontroller's oscillator, an RTC continues counting while the host MCU is in deep sleep or powered down, making it the standard solution for battery-backed time-of-day tracking.
Key features of the PCF8563BS/4,118 include a maximum clock supply current of 1 mA typical at 32 kHz, an integrated I2C slave interface running up to 400 kHz, a programmable square-wave clock output (32.768 kHz, 1024 Hz, 32 Hz, 1 Hz), an open-drain interrupt output, and an on-chip power-on reset plus voltage-low detector. These features let the host MCU wake only on calendar or alarm events, which minimizes total system energy use.
The device uses a low-power CMOS architecture with separate oscillator and timing registers, achieving the typical sub-1 microampere backup current needed for coin-cell battery operation. All 16 RTC registers and the 32.768 kHz trimming circuit are accessed over the standard I2C bus at slave address 0x51 (101 0001b), enabling easy drop-in replacement into designs that already use the PCF8563 footprint.
Typical applications include battery-backed wall-clock modules for metering and data loggers, timekeeping in IoT sensor nodes, alarm and timer functions in white goods, point-of-sale terminals, and any embedded system requiring calendar accuracy during MCU sleep or power loss. The wide 1.8 V to 5.5 V supply range also makes it suitable for 3.3 V and 5 V microcontroller rails.
When designing with the PCF8563, ensure the 32.768 kHz crystal load capacitance matches the oscillator's specified CL (typically 12.5 pF) and add a small decoupling capacitor on VCC. The exposed thermal pad of the HVSON-10 package should be soldered to the ground plane for mechanical stability and improved thermal dissipation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single source for sourcing, selecting, and implementing the PCF8563BS/4,118.
Alternatives de remplacement direct pour PCF8563BS/4,118 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PCF8563BS/4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PCF8563BS/4,118
✅ Remplacement direct✓ En stock
$0.76 / unité
Voir la fiche technique →PCF8563BS/4,118 Spécifications
| Fonction | Real-Time Clock / Calendar |
| Bus Interface | I2C (2-wire serial), up to 400 kHz |
| I2C Slave Address | 0x51 (101 0001b) |
| Supply Voltage (VCC) | 1.8 V to 5.5 V |
| Backup Battery Voltage | 1.8 V to 5.5 V (separate supply domain) |
| Typical Clock Current (32 kHz) | 1 mA (maximum, per datasheet) |
| Time Format | HH:MM:SS and DD/MM/YYYY (BCD) |
| Calendar Functions | Year, month, day, weekday, hours, minutes, seconds |
| Programmable Clock Output | 32.768 kHz, 1024 Hz, 32 Hz, 1 Hz |
| Interrupt Output | Open-drain, programmable |
| Voltage-Low Detector | Integrated |
| Power-On Reset | Integrated (automatic) |
| External Crystal | 32.768 kHz quartz (customer supplied) |
| Boîtier | HVSON-10 (3x3 mm, SOT650-1) with exposed pad |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40 C to +85 C |
| Niveau MSL | 1 (per JEDEC J-STD-020) |
| Statut RoHS | Compliant |
Configuration des broches de PCF8563BS/4,118
| Broche 1 | OSCI — Oscillator input (32.768 kHz crystal) |
| Broche 2 | OSCO — Oscillator output (32.768 kHz crystal) |
| Broche 3 | INT — Interrupt output (open-drain) |
| Broche 4 | VSS — Ground |
| Broche 5 | SDA — I2C serial data |
| Broche 6 | SCL — I2C serial clock |
| Broche 7 | CLKOUT — Programmable clock output |
| Broche 8 | VDD — Supply voltage |
| Broche 9 | NC — Not connected |
| Broche 10 | EP — Exposed thermal pad (tie to VSS) |
Applications typiques
PCF8563BS/4,118 convient pour 6 applications: Battery-Backed Wall-Clock Module, IoT Sensor Node Timekeeping, Data Logger Timestamp Source, White Goods and Appliance Timers, Point-of-Sale Terminal Time Reference, Embedded Metering (Electricity / Water / Gas).
Battery-Backed Wall-Clock Module
The PCF8563BS/4,118 provides continuous timekeeping for wall-clock modules that must keep accurate time across power cycles. The HVSON-10 package and 1.8 V to 5.5 V supply range allow a single CR2032 backup coin cell to maintain time for years while the main system is unpowered. Combined with the integrated voltage-low detector, the host MCU can read a low-battery flag and warn the user before the cell is fully depleted. The 1 mA maximum clock current is comfortably below the self-discharge rate of most lithium coin cells, ensuring multi-year calendar accuracy.
Recommandé
IoT Sensor Node Timekeeping
In IoT sensor nodes, the PCF8563BS/4,118 serves as the always-on time reference that timestamps measurements and wakes the host MCU only on scheduled events. Its sub-microampere backup current enables a coin cell to keep time while the wireless SoC is in deep sleep for months. The open-drain interrupt output can directly drive a wake-up GPIO on the MCU, eliminating the need for the host to poll the RTC over I2C. The wide 1.8 V to 5.5 V supply also simplifies direct connection to a single-cell Li-ion or 2xAA alkaline battery pack.
Recommandé
Data Logger Timestamp Source
Industrial and scientific data loggers rely on the PCF8563BS/4,118 to stamp every measurement sample with wall-clock time even when the main logger board is disconnected from line power. The HVSON-10 footprint saves PCB area versus SOIC-8 alternatives, allowing more channels or memory in the same enclosure. The I2C bus at 400 kHz lets the host read the full BCD register set in a single burst transaction, minimizing time spent in active mode. The integrated voltage-low detector flags when battery backup is failing so the user can service the unit before timestamps become invalid.
Recommandé
White Goods and Appliance Timers
Washing machines, ovens, and dishwashers use the PCF8563BS/4,118 to schedule delayed-start cycles and maintain accurate time across brief power interruptions. The -40 C to +85 C operating range is well suited to kitchen appliance environments, and the HVSON-10 package withstands standard reflow profiles. The programmable CLKOUT pin can drive a 1 Hz or 32 Hz square wave to a sub-controller without consuming the I2C bus. Its low cost and high reliability make it a popular choice in mid-volume consumer appliances.
Recommandé
Point-of-Sale Terminal Time Reference
POS terminals use the PCF8563BS/4,118 to time-stamp transactions for audit trails and end-of-day reporting, where regulatory compliance requires accurate time-of-day records. The 1 mA maximum clock supply current keeps power budgets low in battery-backed POS designs, and the integrated voltage-low detector can flag backup battery degradation to service technicians. The I2C address 0x51 is well documented in many existing POS firmware bases, allowing easy integration into legacy code.
Recommandé
Embedded Metering (Electricity / Water / Gas)
Smart meters for electricity, water, and gas use the PCF8563BS/4,118 to maintain accurate calendar time for time-of-use billing and event logging during multi-year deployment. The sub-microampere backup current is critical for sealed meters that cannot be opened to replace the battery during the design lifetime. The HVSON-10 footprint accommodates dense meter PCBs, and the integrated power-on reset ensures reliable startup after battery replacement in the field.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PCF8563BS/4,118 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PCF8563BS/4 | PCF8563BS/4,118 |
|---|---|---|---|
| Package | HVSON-10 (SOT650-1) 3x3 mm | HVSON-10 (SOT650-1) 3x3 mm - same | HVSON-10 (SOT650-1) 3x3 mm - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Function | RTC / Calendar | RTC / Calendar | RTC / Calendar |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| I2C Address | 0x51 | 0x51 | 0x51 |
| I2C Max Speed | 400 kHz | 400 kHz | 400 kHz |
| Max Clock Current | 1 mA | 1 mA | 1 mA |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Principaux différenciateurs
- Lowest-cost NXP RTC in HVSON-10 (vs PCF85263AT/AX)
- Lower backup current than DS1307 (vs DS1307)
- Faster I2C bus than DS1307 (vs DS1307)
Notes de conception
Place the 32.768 kHz crystal as close as possible to the OSCI (pin 1) and OSCO (pin 2) traces, and keep the trace lengths under 5 mm to minimize parasitic capacitance. Route the SDA and SCL traces away from switching nodes and add 4.7 kohm pull-up resistors on both lines to VCC. The exposed pad (pin 10) must be soldered to the ground plane for mechanical stability and thermal dissipation.
Use a low-Iq LDO such as the MCP1700 for the main VDD rail, and connect the backup battery (CR2032) directly to the VDD pin through a Schottky diode OR-ing circuit so the RTC keeps time when main power is removed. Add a 100 nF decoupling capacitor close to VDD and a 10 microfarad bulk capacitor on the backup supply to handle the inrush during battery insertion.
Do not skip the external 32.768 kHz crystal - the PCF8563 has no internal oscillator. Use a crystal with 12.5 pF load capacitance and check the datasheet's oscillator startup time (typically 1 to 2 seconds). Avoid reading the time registers during a register rollover (typically around 1 second past each minute) without reading multiple times or using the chain-pointer technique to avoid invalid data.
Informations de conformité
RoHS and REACH compliant per NXP product page. Not AEC-Q100 qualified - this part targets consumer/industrial segments, not automotive.
