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PCF2128 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. PCF2128
Description  Integrated RTC / TCXO / Crystal
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF2128 Datasheet(HTML) 5 Page - NXP Semiconductors

 
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PCF2128_SDS_0
© NXP B.V. 2007. All rights reserved.
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
5 of 10
NXP Semiconductors
PCF2128
Real time clock / calendar
7.
Limiting values
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 VBAT an uninterruptible power supply is guaranteed.
You can use the battery backed voltage VOUT to supply an external RAM to retain
RAM data in battery backup mode.
You can connect PFI through an external voltage divider to VDD to allow extra power
fail detection. If not used, connect PFI to VSS.
You can connect the timestamp input pin TS to a push button for tamper detection.
Table 4:
Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
VDD
supply voltage
−0.5
+6.5
V
VBAT
backup battery supply
voltage
−0.5
+6.5
V
IDD
supply current
−50
+50
mA
VI
input voltage
−0.5
+6.5
V
VO
output voltage
−0.5
+6.5
V
II
input current
−10
+10
mA
IO
output current
−10
+10
mA
Ptot
total power dissipation
-
300
mW
Tamb
ambient temperature
−40
+85
°C
Tstg
storage temperature
−65
+150
°C


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