PCF2128 Datasheet, PDF (5/10 Pages) NXP Semiconductors – Integrated RTC / TCXO / Crystal

NXP Semiconductors
PCF2128
Real time clock / calendar
7. Limiting values
Table 4:
Symbol
V_DD
V_BAT
I_DD
V_I
V_O
I_I
I_O
P_tot
T_amb
T_stg
Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134).
Parameter
Conditions
Min
Max Unit
supply voltage
−0.5 +6.5 V
backup battery supply
voltage
−0.5 +6.5 V
supply current
−50
+50
mA
input voltage
−0.5 +6.5 V
output voltage
−0.5 +6.5 V
input current
−10
+10
mA
output current
−10
+10
mA
total power dissipation
-
300
mW
ambient temperature
−40
+85
°C
storage temperature
−65
+150 °C
7.1 ESD values
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 2000 V CDM per JESD22-C101.
• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA.
8. Application information
• The PCF2128 is a ready to run real time clock; no external quartz is required.
• You can set different configurations in your application depending on the PCF2128
functions you want to use.
• The integration of the quartz crystal in the same package as the RTC has the
following advantages:
– elimination of crystal procurement issues
– elimination of RTC frequency tuning
– no more crystal PCB layout issues.
• You can select the SPI or I²C-bus interface using the IFS pin.
• By connecting a battery to V_BAT an uninterruptible power supply is guaranteed.
• You can use the battery backed voltage V_OUT to supply an external RAM to retain
RAM data in battery backup mode.
• You can connect PFI through an external voltage divider to V_DD to allow extra power
fail detection. If not used, connect PFI to V_SS.
• You can connect the timestamp input pin TS to a push button for tamper detection.
PCF2128_SDS_0
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
© NXP B.V. 2007. All rights reserved.
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