14
FN8171.4
October 12, 2006
EQUIVALENT A.C. LOAD CIRCUIT
AC TIMING
Symbol
Parameter
Min.
Max.
Units
fSCK
SSI/SPI clock frequency
2
MHz
tCYC
SSI/SPI clock cycle rime
500
ns
tWH
SSI/SPI clock high rime
200
ns
tWL
SSI/SPI clock low time
200
ns
tLEAD
Lead time
250
ns
tLAG
Lag time
250
ns
tSU
SI, SCK, HOLD and CS input setup time
50
ns
tH
SI, SCK, HOLD and CS input hold time
50
ns
tRI
SI, SCK, HOLD and CS input rise time
2
μs
tFI
SI, SCK, HOLD and CS input fall time
2
μs
tDIS
SO output disable time
0
250
ns
tV
SO output valid time
200
ns
tHO
SO output hold time
0
ns
tRO
SO output rise time
100
ns
tFO
SO output fall time
100
ns
tHOLD
HOLD time
400
ns
tHSU
HOLD setup time
100
ns
tHH
HOLD hold time
100
ns
tHZ
HOLD low to output in high Z
100
ns
tLZ
HOLD high to output in low Z
100
ns
TI
Noise suppression time constant at SI, SCK, HOLD and CS inputs
10
ns
tCS
CS deselect time
2
μs
tWPASU
WP, A0, A1 setup time
0
ns
tWPAH
WP, A0, A1 hold time
0
ns
RH
10pF
CL
RW
RTOTAL
CW
25pF
10pF
RL
SPICE Macromodel
5V
1462
Ω
100pF
SO pin
2714
Ω
3V
1382
Ω
100pF
SO pin
1217
Ω
X9261