PCF8523: Real-Time Clock (RTC) and calendar

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 Sheets (1)
Name/DescriptionModified Date
Real-Time Clock (RTC) and calendar (REV 7.0) PDF (632.0 kB) PCF852328 Apr 2015
Application Notes (3)
Name/DescriptionModified Date
Improved timekeeping accuracy with PCF85063, PCF8523 and PCF2123 using an external temperature sensor (REV 1.0) PDF (309.0 kB) AN1124706 Mar 2015
ESD and EMC sensitivity of IC (REV 1.0) PDF (745.0 kB) AN1085314 Mar 2013
Handling bare die (REV 2.0) PDF (1.6 MB) AN1070616 Jun 2011
Users Guides (5)
Name/DescriptionModified Date
User manual for the I²C-bus RTC PCF8523 demo board OM13511 (REV 1.0) PDF (361.0 kB) UM1076005 Oct 2015
User Manual for NXP® Real Time Clocks PCF85x3, PCF85x63, PCA8565, PCF2123, and PCA21125 (REV 2.1) PDF (961.0 kB) UM1030124 Jul 2015
Store and transport requirements (REV 3.0) PDF (325.0 kB) UM1056910 Mar 2015
I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM1020428 Apr 2014
I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA03 Apr 2013
Brochures (2)
Name/DescriptionModified Date
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 7501754001 Aug 2014
NXP® ultra-low-power RTC/calendars PCF8523 & PCF2123 (REV 2.0) PDF (290.0 kB) 7501707610 Mar 2011
Package Information (4)
Name/DescriptionModified Date
Bare die; 12 bumps (6-6); 1.58 x 2.15 x 0.22 mm (REV 1.0) PDF (158.0 kB) OL-PCF8523U10 Feb 2016
plastic thin shrink small outline package; 14 leads; body width 4.4 mm (REV 1.0) PDF (285.0 kB) SOT402-108 Feb 2016
plastic thermal enhanced very thin small outline package; no leads; 8 terminals; body 4 x 4 x 0.85 mm (REV 1.0) PDF (191.0 kB) SOT909-108 Feb 2016
plastic small outline package; 8 leads; body width 3.9 mm (REV 1.0) PDF (244.0 kB) SOT96-108 Feb 2016
Packing (3)
Name/DescriptionModified Date
HVSON8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 2.0) PDF (182.0 kB) SOT909-1_11819 Apr 2013
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (232.0 kB) SOT96-1_11819 Apr 2013
TSSOP14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (217.0 kB) SOT402-1_11808 Apr 2013
Supporting Information (4)
Name/DescriptionModified Date
Wave Soldering Profile (REV 1.0) PDF (20.0 kB) WAVE_SOLDERING_PROFILE30 Sep 2013
Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE08 Oct 2009
Ordering Information
Productpackage versionresolutioninterfaceVDD (interface) (V)watchdog timerprogrammable alarmcountdown timerstop-watch modeVDD (clock) (V)leap year trackingIDD (nA)temperature compensationTamb (Cel)AEC-Q100 compliant
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateIFR(FIT)MTBF(hour)MSLMSL LF
PCF8523T/1SOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE		Reel 13" Q1/T1ActivePCF8523T/1,118 (9352 935 81118)8523TPCF8523T/1Always Pb-free52E811
PCF8523TK/1SOT909-1Reel 13" Q1/T1ActivePCF8523TK/1,118 (9352 935 73118)8523PCF8523TK/1Always Pb-free52E811
PCF8523TS/1SOT402-1SSOP-TSSOP-VSO-WAVEReel 13" Q1/T1ActivePCF8523TS/1,118 (9352 911 96118)8523TSPCF8523TS/1Always Pb-free52E811
Bulk PackActivePCF8523TS/1,112 (9352 911 96112)8523TSPCF8523TS/1Always Pb-free52E811
PCF8523U/12AA/1OL-PCF8523UWafer, Sawn on FFC, Non-ConductiveActivePCF8523U/12AA/1,00 (9352 938 87005)Standard MarkingPCF8523U/12AA/1Always Pb-free52E8NANA
Real-Time Clock (RTC) and calendar PCF8523
Real-Time Clock (RTC) and calendar interface_and_connectivity
Improved timekeeping accuracy with PCF85063, PCF8523 and PCF2123 using an external temperature sensor PCF85063BTL
ESD and EMC sensitivity of IC pcf8576d_automotive
Handling bare die pcf8576d_automotive
User manual for the I²C-bus RTC PCF8523 demo board OM13511 PCF8523
User Manual for NXP® Real Time Clocks PCF85x3, PCF85x63, PCA8565, PCF2123, and PCA21125 pca8565ts
Store and transport requirements pcf8576d_automotive
I2C-bus specification and user manual pca9685pw
I2C-bus specification and user manual pca9685pw
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
NXP® ultra-low-power RTC/calendars PCF8523 & PCF2123 PCF2123
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
plastic small outline package; 8 leads; body width 3.9 mm CBT3306_Q100
Footprint for reflow soldering NPIC6C596A_Q100
Footprint for wave soldering NPIC6C596A_Q100
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... CBT3306_Q100
plastic thermal enhanced very thin small outline package; no leads; 8 terminals; body 4 x 4 x 0.85 mm PCF8523
HVSON8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... PCF8523
plastic thin shrink small outline package; 14 leads; body width 4.4 mm 74LV164_Q100
SSOP-TSSOP-VSO-WAVE LPC1114FDH28
TSSOP14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... 74LV164_Q100
Bare die; 12 bumps (6-6); 1.58 x 2.15 x 0.22 mm PCF8523
SA612A
PCF8523
74LV164
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