Datasheet

DS1722
2 of 14
ORDERING INFORMATION Table 1
PART MARKING DESCRIPTION
DS1722S DS1722 DS1722 in 150mil 8-Pin SO
DS1722S/T&R DS1722 DS1722 in 150mil 8-Pin SO, 2500 Piece Tape-and-
Reel
DS1722S+ DS1722
(See note)
DS1722 in Lead-Free 150mil 8-Pin SO
DS1722S+T&R DS1722
(See note)
DS1722 in Lead-Free 150mil 8-Pin SO, 2500 Piece
Tape-and-Reel
DS1722U 1722 DS1722 in 8-Pin µMAX
DS1722U/T&R 1722 DS1722 in 8-Pin µMAX, 3000 Piece Tape-and-
Reel
DS1722U+ 1722
(See note)
DS1722 in Lead-Free 8-Pin µMAX
DS1722U+T&R 1722
(See note)
DS1722 in Lead-Free 8-Pin µMAX, 3000 Piece
Tape-and-Reel
Note: A “+” will also be marked on the package next to the pin 1 indicator.
DETAILED PIN DESCRIPTION Table 2
SOIC SYMBOL DESCRIPTION
PIN 1
V
DDD
Digital Supply Voltage 1.8V-5.5V. Defines the top rails for the digital
inputs and outputs.
PIN 2
CE
Chip Enable Must be asserted high for communication to take place for
either the SPI or 3-wire interface.
PIN 3
SCLK
Serial Clock Input Used to synchronize data movement on the serial
interface for either the SPI or 3-wire interface.
PIN 4
GND
Ground pin.
PIN 5
SDO
Serial Data Output When SPI communication is selected, the SDO pin is
the serial data output for the SPI bus. When 3-wire communication is
selected, this pin must be tied to the SDI pin (the SDI and SDO pins function
as a single I/O pin when tied together.)
PIN 6
SDI
Serial Data Input When SPI communication is selected, the SDI pin is the
serial data input for the SPI bus. When 3-wire communication is selected,
this pin must be tied to the SDO pin (the SDI and SDO pins function as a
single I/O pin when tied together.)
PIN 7
SERMODE
Serial Interface Mode Input This pin selects which interface standard will
be used: SPI when connected to V
CC
; standard 3-wire when connected to
GND.
PIN 8
V
DDA
Analog Supply Voltage 2.65V – 5.5V input power pin.