Datasheet

DS2408
5 of 39
PARAMETER
NAME
STANDARD VALUES
DS2408 VALUES
STANDARD
SPEED
OVERDRIVE
SPEED
STANDARD
SPEED
OVERDRIVE
SPEED
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
t
SLOT
(incl. t
REC
)
61µs
(undef.)
7µs
(undef.)
65µs
1)
(undef.)
10µs
(undef.)
t
RSTL
480µs
(undef.)
48µs
80µs
660µs
720µs
53µs
80µs
t
PDH
15µs
60µs
2µs
6µs
15µs
60µs
2µs
7µs
t
PDL
60µs
240µs
8µs
24µs
60µs
280µs
7µs
27µs
t
W0L
60µs
120µs
6µs
16µs
60µs
120µs
8µs
13µs
t
SLS
, t
SPD
15µs
60µs
2µs
6µs
15µs
60µs
1.8µs
8µs
1)
Intentional change, longer recovery-time requirement due to modified 1-Wire front end.
PIN DESCRIPTION
PIN
NAME
DESCRIPTION
1
N.C.
Not Connected
2 P0
I/O Pin of Channel 0. Logic input/open-drain output with 100Ω maximum
on-resistance; 0V to 5.25V operating range. Power-on default is
indeterminate. If it is application-critical for the outputs to power up in the
"off" state, the user should attach an appropriate power-on-reset circuit or
supervisor IC to the RSTZ pin.
3 V
CC
Optional Power Supply Input. Range 2.8V to 5.25V; must be tied to GND
if not used.
4
I/O
1-Wire Interface. Open-drain, requires external pullup resistor.
5
GND
Ground
6
N.C.
Not Connected
7
P7
I/O Pin of Channel 7. Same characteristics as P0.
8
P6
I/O Pin of Channel 6. Same characteristics as P0.
9
P5
I/O Pin of Channel 5. Same characteristics as P0.
10 RSTZ
SW configurable PIO reset input (
RST
) or open-drain strobe output
(
STRB
). When configured as
RST
, a LOW input sets all PIO outputs to
the "off" state by setting all bits in the PIO Output Latch State Register.
When configured as
STRB
, an output strobe will occur after a PIO write
(see Channel-Access Write command) or after a PIO Read (see Channel-
Access Read command). The power-on default function of this pin is
RST
.
11
P4
I/O pin of channel 4; same characteristics as P0
12
P3
I/O pin of channel 3; same characteristics as P0
13
P2
I/O pin of channel 2; same characteristics as P0
14
P1
I/O pin of channel 1; same characteristics as P0
15
N.C.
Not connected
16
N.C.
Not connected