Cirrus Logic CS4391 - Manual (Page 11)

CS4391
DS335PP4 11
SWITCHING CHARACTERISTICS - SPI CONTROL PORT
(T
A
= 25° C; VL = 5.5 to 1.8 Volts; Inputs: logic 0 = AGND, logic 1 = VL, C
L
= 30 pF)
Notes: 24. t
spi
only needed before first falling edge of CS after RST rising edge. t
spi
= 0 at all other times.
25. Data must be held for sufficient time to bridge the transition time of CCLK.
26. For F
SCK
< 1 MHz
Parameter Symbol Min Max Unit
SPI Mode
CCLK Clock Frequency f
sclk
- 6 MHz
RST Rising Edge to CS Falling t
srs
500 - ns
CCLK Edge to CS Falling (Note 24) t
spi
500 - ns
CS High Time Between Transmissions t
csh
1.0 - µs
CS Falling to CCLK Edge t
css
20 - ns
CCLK Low Time t
scl
66 - ns
CCLK High Time t
sch
66 - ns
CDIN to CCLK Rising Setup Time t
dsu
40 - ns
CCLK Rising to DATA Hold Time (Note 25) t
dh
15 - ns
Rise Time of CCLK and CDIN (Note 26) t
r2
- 100 ns
Fall Time of CCLK and CDIN (Note 26) t
f2
- 100 ns
t r2 t f2
t dsu t
dh
t sch t scl
C S
C C L K
C D IN
t css
t csh
t spi
t srs R S T
Figure 4. SPI Control Port Timing