DS2431 データシートの表示（PDF） - Maxim Integrated
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DS2431 Datasheet PDF : 26 Pages
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1024-Bit, 1-Wire EEPROM
Note 19: Current drawn from IO during the EEPROM programming interval. The pullup circuit on IO during the programming interval
should be such that the voltage at IO is greater than or equal to VPUPMIN. If VPUP in the system is close to VPUPMIN, a low-
impedance bypass of RPUP, which can be activated during programming, may need to be added.
Note 20: Interval begins tREHMAX after the trailing rising edge on IO for the last time slot of the E/S byte for a valid Copy Scratchpad
sequence. Interval ends once the device’s self-timed EEPROM programming cycle is complete and the current drawn by
the device has returned from IPROG to IL.
Note 21: tPROG for units branded version “A1” is 12.5ms. tPROG for units branded version “A2” and later is 10ms.
Note 22: Write-cycle endurance is degraded as TA increases.
Note 23: Not 100% production tested; guaranteed by reliability monitor sampling.
Note 24: Data retention is degraded as TA increases.
Note 25: Guaranteed by 100% production test at elevated temperature for a shorter time; equivalence of this production test to the
data sheet limit at operating temperature range is established by reliability testing.
Note 26: EEPROM writes can become nonfunctional after the data-retention time is exceeded. Long-term storage at elevated tem-
peratures is not recommended; the device can lose its write capability after 10 years at +125°C or 40 years at +85°C.
COMPARISON TABLE
LEGACY VALUES
DS2431 VALUES
PARAMETER
STANDARD SPEED
(μs)
OVERDRIVE SPEED
(μs)
STANDARD SPEED
(μs)
OVERDRIVE SPEED
(μs)
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
tSLOT (including tREC)
61
(undefined)
7
(undefined)
65*
(undefined)
8*
(undefined)
tRSTL
480
(undefined)
48
80
480
640
48
80
tPDH
15
60
2
6
15
60
2
6
tPDL
60
240
8
24
60
240
8
24
tW0L
60
120
6
16
60
120
6
15.5
*Intentional change; longer recovery time requirement due to modified 1-Wire front-end.
Note: Numbers in bold are not in compliance with legacy 1-Wire product standards.
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