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BQ4285LS Datasheet(PDF) 23 Page - Texas Instruments

Part # BQ4285LS
Description  Enhanced RTC With NVRAM Control
PDF  32 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ4285LS Datasheet(HTML) 23 Page - Texas Instruments

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Power-Down/Power-Up Timing—bq4285L (TA = TOPR)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
Conditions
tF
VCC slew from 2.7V to 0V
300
-
-
µs
tR
VCC slew from 0V to 2.7V
100
-
-
µs
tCSR
CS at VIH after power-up
20
-
200
ms
Internal write-protection
period after VCC passes VPFD
on power-up.
tWPT
Write-protect time for ex-
ternal RAM
-0
-
VBC > VPFD
10
16
30
µsVBC < VPFD
tCER
Chip enable recovery time
tCSR
-
tCSR
ms
Time during which external
SRAM is write-protected after
VCC passes VPFD on power-up.
tCED
Chip enable propagation
delay to external SRAM
-
9
15
ns
Caution:
Negative undershoots below the absolute maximum rating of -0.3V in battery-backup mode
may affect data integrity.
Power-Down/Power-Up Timing—bq4285L
bq4285E/L



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