Name: 100 NA RealTime ClockCalendar with Battery Backup
Availability: InStock

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The PCF8523 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. Data is transferred serially via the I²C-bus with a maximum data rate of 1000 kbit/s. Alarm and timer functions are available with the possibility to generate a wake-up signal on an interrupt pin. An offset register allows fine-tuning of the clock. The PCF8523 has a backup battery switch-over circuit, which detects power failures and automatically switches to the battery supply when a power failure occurs.

Data Sheet

Application Notes

Product Details

Features

Key Features

Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
Resolution: seconds to years
Clock operating voltage: 1.0 V to 5.5 V
Low backup current: typical 150 nA at V_DD = 3.0 V and T_amb = 25 °C
2 line bidirectional 1 MHz Fast-mode Plus (Fm+) I²C interface, read D1h, write D0h
Battery backup input pin and switch-over circuit
Freely programmable timer and alarm with interrupt capability
Selectable integrated oscillator load capacitors for C_L = 7 pF or C_L = 12.5 pF
Internal Power-On Reset (POR)
Open-drain interrupt or clock output pins
Programmable offset register for frequency adjustment

Buy/Parametrics

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Design Resources

Design Files

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2 design files

Receive the full breakdown. See the product footprint and more in the eCad file.

Symbols and Footprints
PCF8523TS_1-TSSOP14-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jul 9, 2020 14:03:0037.08 KBPCF8523TS_1-TSSOP14-BXL
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Symbols and Footprints
PCF8523TS-1-TSSOP14-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 22, 2020 11:16:0037.08 KBPCF8523TS-1-TSSOP14-BXL
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Hardware

Quick reference to our board types.

1 hardware offering

Evaluation and Development Boards
I²C-Bus RTC PCF8523 Demo Board
No Longer Manufactured

OM13511

Engineering Services

To get further assistance directly from NXP, please see our Engineering Services.

3 engineering services

Independent Design House (IDH)
Hardware Design Services

By TAGnology RFID GmbH GoldHQ: Voitsberg, AustriaSupporting Regions: EMEA
Independent Design House (IDH)
NFC hardware design review and consulting

By GMMC GmbH GoldHQ: Graz, AustriaSupporting Regions: EMEA, Americas, APAC
Independent Design House (IDH)
Embedded Software Design

By TAGnology RFID GmbH GoldHQ: Voitsberg, AustriaSupporting Regions: EMEA

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100 NA Real-Time Clock/Calendar with Battery Backup

Product Details

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Key Features

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Application Note (3)

Improved timekeeping accuracy with PCF85063, PCF8523 and PCF2123 using an external temperature sensor[AN11247]

ESD and EMC sensitivity of IC[AN10853]

Handling bare die[AN10706]

Brochure (1)

NXP ultra-low-power RTC/calendars PCF8523 and PCF2123[75017076]

Data Sheet (1)

Real-Time Clock (RTC) and calendar[PCF8523]

Package Information (4)

Plastic, small outline package; 8 terminals; 1.27 mm pitch; 4.9 mm x 3.9 mm x 1.75 mm body[SOT96-1]

Bare die; 12 bumps (6-6); 1.58 x 2.15 x 0.22 mm[OL-PCF8523U]

plastic thin shrink small outline package; 14 leads; body width 4.4 mm[SOT402-1]

plastic thermal enhanced very thin small outline package; no leads; 8 terminals; body 4 x 4 x 0.85 mm[SOT909-1]

Packing Information (3)

SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT96-1_118]

HVSON8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT909-1_118]

TSSOP14; Reel pack; SMD, 13"Q1/T1 Standard product orientationOrderable part number ending ,118 or JOrdering code (12NC) ending 118[SOT402-1_118]

Selector Guide (1)

Real Time Clocks Selector Guide Brochure[RTCSelectorGuideA4]

Supporting Information (1)

Footprint for wave soldering[SSOP-TSSOP-VSO-WAVE]

User Guide (3)

I2C-bus specification and user manual[UM10204]

User manual for the I²C-bus RTC PCF8523 demo board OM13511[UM10760]

User Manual for NXP Real Time Clocks PCF85x3, PCF85x63, PCA8565, PCF2123, and PCA21125[UM10301]

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PCF8523TS_1-TSSOP14-CAD Symbol and PCB Footprint – BXL File

PCF8523TS-1-TSSOP14-CAD Symbol and PCB Footprint – BXL File

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