
CS4299
7
AC ’97 SERIAL PORT TIMING Standard test conditions unless otherwise noted: T
ambient = 25° C,
AVdd = 5.0 V, DVdd = 3.3 V; CL = 55 pF load.
Parameter
Symbol
Min
Typ
Max
Unit
RESET Timing
RESET# active low pulse width
Trst_low
1.0
-
s
RESET# inactive to BIT_CLK start-up delay
Trst2clk
-
40.0
-
s
1st SYNC active to CODEC READY set
Tsync2crd
-
62.5
-
s
Vdd stable to Reset inactive
Tvdd2rst#
100
-
s
Clocks
BIT_CLK frequency
Fclk
-
12.288
-
MHz
BIT_CLK period
Tclk_period
-
81.4
-
ns
BIT_CLK output jitter (depends on XTAL_IN source)
-
750
ps
BIT_CLK high pulse width
Tclk_high
36
40.7
45
ns
BIT_CLK low pulse width
Tclk_low
36
40.7
45
ns
SYNC frequency
Fsync
-48
-
kHz
SYNC period
Tsync_period
-
20.8
-
s
SYNC high pulse width
Tsync_high
-1.3
-
s
SYNC low pulse width
Tsync_low
-
19.5
-
s
Data Setup and Hold
Output Propagation delay from rising edge of BIT_CLK
Tco
810
12
ns
Input setup time from falling edge of BIT_CLK
Tisetup
10
-
ns
Input hold time from falling edge of BIT_CLK
Tihold
0-
-
ns
Input Signal rise time
Tirise
2-
6
ns
Input Signal fall time
Tifall
2-
6
ns
Output Signal rise time
Torise
24
6
ns
Output Signal fall time
Tofall
24
6
ns
Misc. Timing Parameters
End of Slot 2 to BIT_CLK, SDATA_IN low (PR4)
Ts2_pdown
-.28
1.0
s
SYNC pulse width (PR4) Warm Reset
Tsync_pr4
1.0
-
s
SYNC inactive (PR4) to BIT_CLK start-up delay
Tsync2clk
162.8
285
-
ns
Setup to trailing edge of RESET# (ATE test mode) (Note
4)Tsetup2rst
15
-
ns
Rising edge of RESET# to Hi-Z delay
Toff
-
25
ns
DS319PP6
7
CS4299