Datasheet

DS1992/DS1993
3 of 17
Figure 1. DS1992/DS1993 BLOCK DIAGRAM
SRAM
16 PAGES of 256-
BITs (1993)
256-BIT
SCRATCHPAD
1-W
ROM
CONTROL
FUNCTION
64-BIT
ROM
LASERED
PARASITE-
CIRCUITRY
POWERED
MEMORY
FUNCTION
CONTROL
1-WIRE
PORT
3V LITHIUM
4 PAGES of 256-
BITs (1992)
Figure 2. 64-BIT LASERED ROM
MSB
LSB
8-Bit CRC Code 48-Bit Serial Number
8-Bit Family Code
(06h)1993
(08h)1992
MSB
LSB
MSB
LSB
MSB
LSB
Figure 3. 1-Wire CRC CODE
X
0
X
1
X
2
X
3
X
4
X
5
X
6
X
7
X
8
Polynomial = X
8
+ X
5
+ X
4
+ 1
1
st
STAGE
2
nd
STAGE
3
rd
STAGE
4
th
STAGE
6
th
STAGE
5
th
STAGE
7
th
STAGE
8
th
STAGE
INPUT DATA