DS1972 Maxim, DS1972 Datasheet - Page 4

• Manufacturer Part Number: DS1972
• Description: The DS1972 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each in a rugged iButton® package
• Manufacturer: Maxim

1024-Bit EEPROM iButton
COMPARISON TABLE
Note 19: Current drawn from IO during the EEPROM programming interval. The pullup circuit on IO during the programming interval
Note 20: Interval begins t
Note 21: Write-cycle endurance is degraded as T
Note 22: Not 100% production tested; guaranteed by reliability monitor sampling.
Note 23: Data retention is degraded as T
Note 24: Guaranteed by 100% production test at elevated temperature for a shorter time; equivalence of this production test to the
Note 25: EEPROM writes can become nonfunctional after the data-retention time is exceeded. Long-term storage at elevated tem-
* 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.
4
t
t
t
t
t
SLOT
RSTL
PDH
PDL
W0L
_______________________________________________________________________________________
PARAMETER
(including t
should be such that the voltage at IO is greater than or equal to V
impedance bypass of R
sequence. Interval ends once the device’s self-timed EEPROM programming cycle is complete and the current drawn by
the device has returned from I
data sheet limit at operating temperature range is established by reliability testing.
peratures is not recommended; the device can lose its write capability after 10 years at +125°C or 40 years at +85°C.
REC
)
REHMAX
STANDARD SPEED
MIN
480
61
15
60
60
PUP
after the trailing rising edge on IO for the last time slot of the E/S byte for a valid Copy Scratchpad
(μs)
, which can be activated during programming, may need to be added.
(undefined)
(undefined)
PROG
A
LEGACY VALUES
MAX
240
120
increases.
60
to I
L
.
A
increases.
OVERDRIVE SPEED
MIN
48
7
2
8
6
(μs)
(undefined)
MAX
80
24
16
6
PUPMIN
STANDARD SPEED
. If V
MIN
480
65*
15
60
60
PUP
(μs)
in the system is close to V
(undefined)
MAX
DS1972 VALUES
640
240
120
60
OVERDRIVE SPEED
MIN
48
8*
2
8
6
PUPMIN
(μs)
(undefined)
MAX
15.5
, a low-
80
24
6