388
Table 12-34 SPI Timing (VDD = 1.8 V to 3.6 V, TA = -20oC to 75oC)
Characteristic
Conditions
Symbol
Min
*
1
Max
*
1
Unit
Operating Frequency
f
OP
t
CYC
t
LEAD1
t
LAG1
t
RDY
dc
1
MHz
Cycle Time
1000
ns
Select Lead Time
200
ns
De-select Lag Time
200
ns
Select-to-Ready Time
previous packet did not program an
address word
*
2
C
L
=50pf
previous packet programmed an address
word
*
2
C
L
=50pf
previous packet was a checksum/special
packet
*
3
C
L
=50pf
80
μ
s
Select-to-Ready Time
t
RDY
420
μ
s
Re-select Time
t
RS
30
μ
s
Ready High Time
t
RH
t
LEAD2
t
LAG2
t
SU
t
HI
t
AC
t
DIS
t
V
t
HO
t
SSH
t
SCKH
t
SCKL
t
R
t
F
50
μ
s
Ready Lead Time
200
ns
Not Ready Lag Time
C
L
=50pf
200
ns
MOSI Data Setup Time
200
ns
MOSI Data Hold Time
200
ns
MISO Access Time
C
L
=50pf
0
200
ns
MISO Disable Time
300
ns
MISO Data Valid Time
C
L
=50pf
200
ns
MISO Data Hold Time
0
ns
SS High Time
200
ns
SCK High Time
300
ns
SCK Low Time
300
ns
SCK Rise Time
20% to 70% V
DD
20% to 70% V
DD
1
μ
s
μ
s
SCK Fall Time
Notes: 1. The specifications given in this data sheet indicate the minimum performance level of
all FLEX decoders regardless of manufacturer. Individual manufacturers may have
better performance than indicated.
2. When the host re-programs an address word with a Host-to-Decoder packet ID > 127
(decimal), there may be an added delay before the FLEX decoder is ready for another
packet.
3. When the host sends a checksum packet (ID is 00) or a special packet (ID is 1C
through 1F hex) the t
specification applies, otherwise the timing specifications for t
LAG1
and t
SSH
govern the re-select timing.
1