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EP7209 Datasheet, PDF (95/128 Pages) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip
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EP7209
6.4 AC Characteristics
All characteristics are specified at VDD = 2.3 to 2.7 volts and VSS = 0 volts over an operating temperature
of 0°C to +70°C. Those characteristics marked with a # will be significantly different for 13 MHz mode
because the EXPCLK is provided as an input rather than generated internally. These timings are estimated
at present. The timing values are referenced to 1/2 VDD.
Symbol
Parameter
13 MHz
18/36 MHz
Min
Max
Min
Max
t1
Falling CS to data bus Hi-Z
0
35
0
25
t2
Address change to valid write data
0
45
0
35
t3
DATA in to falling EXPCLK setup time
0#
—
18
—
t4
DATA in to falling EXPCLK hold time
10 #
—
0
—
t5
EXPRDY to falling EXPCLK setup time
0#
—
18
—
t6
Falling EXPCLK to EXPRDY hold time
10 #
50
0
50
t7
Rising nMWE to data invalid hold time
10
—
5
—
t8
Sequential data valid to falling NMWE setup time
–10
10
–10
10
t15 LCD CL2 low time
80
3,475
80
3,475
t16 LCD CL2 high time
80
3,475
80
3,475
t17 LCD falling CL[2] to rising CL[1] delay
0
25
0
25
t18 LCD falling CL[1] to rising CL[2]
80
3,475
80
3,475
t19 LCD CL[1] high time
80
3,475
80
3,475
t20 LCD falling CL[1] to falling CL[2]
200
6,950
200
6,950
t21 LCD falling CL[1] to FRM toggle
300
10,425
300
10,425
t22 LCD falling CL[1] to M toggle
–10
20
–10
20
t23 LCD rising CL[2] to display data change
–10
20
–10
20
t24 Falling EXPCLK to address valid
—
33 #
—
5
t25 Data valid to falling nMWE for non sequential access only 5
—
5
—
t31 SSICLK period (slave mode)
0
512
0
512
t32 SSICLK high
925
1025
925
1025
t33 SSICLK low
925
1025
925
1025
t34 SSICLK rise/fall time
7
7
t35 SSICLK rising to RX and/or TX frame sync
528
528
t36 SSICLK rising edge to frame sync low
448
448
t37 SSICLK rising edge to TX data valid
80
80
t38 SSIRXDA data set-up time
30
30
t39 SSIRXDA data hold time
40
40
t40 SSITXFR and/or SSIRXFR period
750
750
The values for 36 MHz include 1 wait state, the 18 MHz values have 0 wait states.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
Table 55. AC Timing Characteristics
DS453PP2
95
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