User guide

DS2181A
041995 28/32
AC ELECTRICAL CHARACTERISTICS
1,2
SERIAL PORT (0°C to 70°C, V
DD
= 5V + 5%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
SDI to SCLK Setup t
DC
50 ns
SCLK to SDI Hold t
CDH
50 ns
SCLK Low Time t
CL
244 ns
SCLK High Time t
CH
244 ns
SCLK Rise and Fall Times t
R
,t
F
100 ns
CS to SCLK Setup t
CC
50 ns
SCLK to CS Hold t
CCH
50 ns
CS Inactive Time t
CWH
2.5 us
SCLK to SDO Valid t
CDV
200 ns
CS to SDO High Z t
CDZ
75 ns
NOTES:
1. Measured at V
IH
= 2.0 or V
IL
= .8 and 10 ns maximum rise and fall time.
2. Output load capacitance = 100 pF.
AC ELECTRICAL CHARACTERISTICS
1,2
TRANSMIT (0°C to 70°C, V
DD
= 5V + 5%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
TCLK Period t
p
488 ns
TCLK Pulse Width t
WL
,t
WH
244 ns
TCLK Rise and Fall Times t
R
,t
F
20 ns
TSER, TSD, TIND and TXD Setup
to TCLK Falling
t
STD
50 ns
TSER, TSD, TIND and TXD Hold to
TCLK Falling
t
HTD
50 ns
TFSYNC, TMSYNC Setup to TCLK
Falling
t
STS
75 ns
TFSYNC, TMSYNC Hold to TCLK
Falling
t
HTS
50 ns
Propagation Delay TCLK to
TCHCLK, TSTS, TMO, TAF
t
PTS
75 ns
NOTES:
1. Measured at V
IH
= 2.0 or V
IL
= .8 and 10 ns maximum rise and fall time.
2. Output load capacitance = 100 pF.