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BQ2204ASN Datasheet(PDF) 6 Page - Texas Instruments

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Part # BQ2204ASN
Description  X4 SRAM Nonvolatile Controller Unit
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ2204ASN Datasheet(HTML) 6 Page - Texas Instruments

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6
AC Test Conditions
Parameter
Test Conditions
Input pulse levels
0V to 3.0V
Input rise and fall times
5ns
Input and output timing reference levels
1.5V (unless otherwise specified)
FG220102.eps
5V
960
100pF
CECON
510
Figure 3. Output Load
Power-Fail Control (TA =TOPR)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
Notes
tPF
VCC slew, 4.75V to 4.25V
300
-
-
µs
tFS
VCC slew, 4.25V to VSO
10
-
-
µs
tPU
VCC slew, 4.25V to 4.75V
0
-
-
µs
tCED
chip-enable propagation delay
-
7
10
ns
tAS
A,B set up to CE
0-
-
ns
tCER
chip-enable recovery
40
80
120
ms
Time during which SRAM is
write-protected after VCC
passes VPFD on power-up.
tWPT
Write-protect time
40
100
150
µs
Delay after VCC slews down
past VPFD before SRAM is
write-protected.
Note:
Typical values indicate operation at TA = 25°C, VCC =5V.
Caution:
Negative undershoots below the absolute maximum rating of -0.3V in battery-backup mode
may affect data integrity.
Dec. 1992 B
bq2204A


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