Datasheet

DS21Q50
81 of 87
21.3 Serial Port
AC CHARACTERISTICS—SERIAL PORT (BTS1 = 1, BTS0 = 0)
(V
DD
= 3.3V ±5%, T
A
= 0°C to +70°C for DS21Q50L; V
DD
= 3.3V ±5%, T
A
= -40°C to +85°C for DS21Q50N.)
PARAMETER SYMBOL MIN TYP MAX UNITS
Setup Time CS to SCLK
t
CSS
50 ns
Setup Time SDI to SCLK t
SSS
50 ns
Hold Time SCLK to SDI t
SSH
50 ns
SCLK High/Low Time t
SLH
200 ns
SCLK Rise/Fall Time t
SRF
50 ns
SCLK to CS Inactive
t
LSC
50 ns
CS Inactive Time
t
CM
250 ns
SCLK to SDO Valid t
SSV
50 ns
SCLK to SDO Three-State t
SSH
100 ns
CS Inactive to SDO Three-State
t
CSH
100 ns
Figure 21-8. Serial Bus Timing (BTS1 = 1, BTS0 = 0)
SCLK
1
SCLK
2
SDI
C
S
HIGH Z
SDO
t
CSS
t
SSS
t
SSH
t
SRF
t
SLH
t
LSC
t
CM
t
SSV
t
SSH
t
CSH
HIGH Z
LSB
LSB
LSB MSB
MSB
MSB
NOTE 1: OCES =1 AND ICES = 0.
NOTE 2: OCES = 0 AND ICES = 1.