XRT73LC00A
20
REV. 1.0.2
E3/DS3/STS-1 LINE INTERFACE UNIT
AC ELECTRICAL CHARACTERISTICS (CONT.)
(Ta = 25°C, Vdd = 3.3V + 5%, unless otherwise specified)
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNITS
Microprocessor Serial Interface Timing (see
Figure 10)t21
CS Low to Rising Edge of SCLK Setup Time
5
ns
t22
SCLK Falling Edge to CS Low Assertion Time
20
ns
t23
SDI to Rising Edge of SCLK Setup Time
50
ns
t24
SDI to Rising Edge of SCLK Hold Time
50
ns
t25
SCLK “Low” Time
240
ns
t26
SCLK “High” Time
240
ns
t27
SCLK Period
500
ns
t28
CS Low to Rising Edge of SCLK Hold Time
5
ns
t29
CS Inactive Time
250
ns
t30
Falling Edge of SCLK to SDO Valid Time
200
ns
t31
Falling Edge of SCLK to SDO Invalid Time
100
ns
t32
Falling Edge of SCLK or Rising Edge of CS to High Z
100
ns
t33
Rise/Fall time of SDO Output
40
ns
FIGURE 10. TIMING DIAGRAM FOR THE MICROPROCESSOR SERIAL INTERFACE
SDI
R/W
A1
A0
CS
SCLK
CS
SCLK
SDI
SDO
D0
D1
D2
D7
t22
t21
t23
t24
t25
t26
t27
t28
t29
t30
t31
t32
t33
Hi-Z