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VT82885 数据表(PDF) 12 Page - List of Unclassifed Manufacturers

部件名 VT82885
功能描述  Real Time Clock
PDF  16 Pages
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制造商  ETC [List of Unclassifed Manufacturers]
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标志 ETC - List of Unclassifed Manufacturers

VT82885 数据表(HTML) 12 Page - List of Unclassifed Manufacturers

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VT82885
Real Time Clock
VIA Technologies, Inc.
Pulse Width, DS/E High or
RD/WR# Low
PWEH
125
ns
Input Rise and Fall Time
tR, tF
30
ns
R/W# Hold Time
tRWH
10
ns
R/W# Setup Time
before DS/E
tRWS
50
ns
Chip Select Setup Time
before DS, WR#, or RD#
tCS
20
ns
Chip Select Hold Time
tCH
0ns
Read Data Hold Time
tDHR
10
80
ns
Write Data Hold Time
tDHW
0
Muxed Address Valid Time
to AS/ALE Fall
tASL
30
ns
Muxed Address Hold Time
tAHL
10
ns
Delay Time DS/E
to AS/ALE Rise
tASD
25
ns
Pulse Width AS/ALE High
PWASH
60
ns
Delay Time, AS/alE
to DS/E Rise
tASED
40
ns
Output Data Delay Time
from DS/E or RD#
tDDR
20
120
ns
DataSetup Time
tDSW
100
ns
Reset Pulse Width
tRWL
5
µs
IRQ# Release from DS
tIRDS
2
µs
IRQ# Release from
RESET#
tIRR
2
µs
Delay Time before Update
Cycle
tBUC
244
µs
Periodic Interrupt Time
Interval
tPI
See Table
1
Time of Update Cycle
tUC
1708
µs
NOTES
1.
All voltages are referenced to ground.
2.
All outputs are open.
3.
Applies to the AD0-AD7 pins, the IRQ#
pin and the SQW pin when each is in the
high impedence state.
4.
The IRQ# pin is open drain.
5.
Measured with a load as shown in
Figure 4.
FIGURE 4: OUTPUT LOAD



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