DS1993 Maxim, DS1993 Datasheet - Page 3

• Manufacturer Part Number: DS1993
• Description: The DS1992/DS1993 memory iButtons (hereafter referred to as DS199_) are rugged read/write data carriers that act as a localized database, easily accessible with minimal hardware
• Manufacturer: Maxim

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