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參數(shù)資料
| 型號(hào)： | 12C887 |
| 英文描述： | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1 RoHS Compliant: Yes |
| 中文描述： | 實(shí)時(shí)時(shí)鐘 |
| 文件頁(yè)數(shù)： | 6/19頁(yè) |
| 文件大?。?/td> | 193K |
| 代理商： | 12C887 |
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DS12C887
14 of 19
AC ELECTRICAL CHARACTERISTICS
(0°C to 70°C; VCC = 5.0V ± 10%)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Cycle Time
tCYC
385
DC
ns
Pulse Width, DS/E Low or
RD/ WR High
PWEL
150
ns
Pulse Width, DS/E High or
RD/ WR Low
PWRH
125
ns
Input Rise and Fall
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
0ns
Mux’ed Address Valid Time to
ALE Fall
tASL
30
ns
Mused Address Hold Time to
ALE Fall
tAHL
10
ns
Delay Time DS/E to AS/ALE
Rise
tASD
20
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
6
Data Setup Time
tDSW
100
ns
Reset Pulse Width
tRWL
5
s
IRQ
Release from DS
tIRDS
2
s
IRQ
Release from RESET
tIRR
2
s
NOTES:
1. All voltages are referenced to ground.
2. All Outputs are open.
3. The MOT pin has an internal pull-down of 20K
.
4. Applies to the AD0-AD7 pins, the IRQ pin, and the SQW pin when each is in a high impedance state.
5. The IRQ pin is open drain.
6. Measured with a load as shown in Figure 4.
7. Real-Time Clock Modules can be successfully processed through conventional wave-soldering
techniques as long as temperature exposure to the lithium energy source contained within does not
exceed +85°C. Post solder cleaning with water washing techniques is acceptable, provided that
ultrasonic vibration is not used. Such cleaning can damage the crystal.
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