DS1249W-100 データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated
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DS1249W-100 Datasheet PDF : 8 Pages
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DS1249W
7. If the CE high transition occurs prior to, or simultaneously with, the WE high transition, the output
buffers remain in a 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 DS1249W 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. DS1249 modules are recognized by Underwriters Laboratory (U.L.â) under file E99151.
DC TEST CONDITIONS
Outputs open
Cycle = 200ns for operating current
All voltages are referenced to ground
AC TEST CONDITIONS
Output Load: 100pF + 1TTL Gate
Input Pulse Levels: 0 to 2.7V
Timing Measurement Reference Levels
Input: 1.5V
Output: 1.5V
Input Pulse Rise and Fall Times: 5ns
ORDERING INFORMATION
DS1249W - SSS - III
Operating Temperature Range
blank: 0°C to +70°C
IND: -40°C to +85°C
Access Speed
100: 100ns
150: 150ns
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