DS1245AB-100 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated
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DS1245AB-100 Datasheet PDF : 12 Pages
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POWER-DOWN/POWER-UP TIMING
PARAMETER
SYMBOL
CE , WE at VIH before Power-Down
tPD
VCC slew from VTP to 0V ( CE at VIH)
tF
VCC slew from 0V to VTP ( CE at VIH)
tR
CE , WE at VIH after Power-Up
tREC
MIN
0
300
300
2
TYP
DS1245Y/AB
(tA: See Note 10)
MAX UNITS NOTES
µs
11
µs
µs
125
ms
PARAMETER
Expected Data Retention Time
SYMBOL MIN TYP
tDR
10
MAX
(tA=25°C)
UNITS NOTES
years
9
WARNING:
Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery
backup mode.
NOTES:
1. WE is high for a Read Cycle.
2. OE = VIH or VIL. If OE = VIH during write cycle, the output buffers remain in a high impedance state.
3. tWP is specified as the logical AND of CE and WE . tWP is measured from the latter of CE or WE
going low to the earlier of CE or WE going high.
4. tDH, tDS are measured from the earlier of CE or WE going high.
5. These parameters are sampled with a 5 pF load and are not 100% tested.
6. If the CE low transition occurs simultaneously with or latter than the WE low transition, the output
buffers remain in a high impedance state during this period.
7. If the CE high transition occurs prior to or simultaneously with the WE high transition, the output
buffers remain in high impedance state during this period.
8. If WE is low or the WE low transition occurs prior to or simultaneously with the CE low transition,
the output buffers remain in a high impedance state during this period.
9. Each DS1245 has a built-in switch that disconnects the lithium source until VCC is first applied by the
user. The expected tDR is defined as accumulative time in the absence of VCC starting from the time
power is first applied by the user.
10. All AC and DC electrical characteristics are valid over the full operating temperature range. For
commercial products, this range is 0°C to 70°C. For industrial products (IND), this range is -40°C to
+85°C.
11. In a power-down condition the voltage on any pin may not exceed the voltage on VCC.
12. tWR1 and tDH1 are measured from WE going high.
13. tWR2 and tDH2 are measured from CE going high.
14. DS1245 DIP modules are recognized by Underwriters Laboratory (U.L.) under file E99151.
DS1245 PowerCap modules are pending U.L. review. Contact the factory for status.
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