Timing characteristics – Rainbow Electronics MAX3420E User Manual
Page 10
MAX3420E
USB Peripheral Controller
with SPI Interface
10
______________________________________________________________________________________
Note 1: Parameters are 100% production tested at T
A
= +25°C, and guaranteed by correlation over temperature.
Note 2: Design guaranteed by bench testing. Limits are not production tested.
Note 3: At V
L
= 1.71V to 2.5V, derate all of the SPI timing characteristics by 50%. Not production tested.
Note 4: The minimum period is derived from SPI timing parameters.
Note 5: Time-to-exit suspend is dependent on the crystal used.
Note 6: Redesign in progress to meet USB specification.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
USB TRANSMITTER TIMING CHARACTERISTICS
D+, D- Rise Time
t
RISE
C
L
= 50pF, Figures 6 and 7
4
20
ns
D+, D- Fall Time
t
FALL
C
L
= 50pF, Figures 6 and 7
4
20
ns
Rise-/Fall-Time Matching
C
L
= 50pF, Figures 6 and 7 (Note 2)
90
110
%
Output-Signal Crossover Voltage
C
L
= 50pF, Figures 6 and 7 (Note 2)
1.3
2.0
V
SPI BUS TIMING CHARACTERISTICS (V
L
= 2.5V, C
SS
= 33pF*) (Figures 8 and 9) (Note 3)
V
L
= 1.71V
77.0
S eri al C l ock ( SC LK) P eri od ( N ote 4)
t
CP
V
L
= 2.5V
38.4
ns
SCLK Pulse-Width High
t
CH
17
ns
SCLK Pulse-Width Low
t
CL
17
ns
SS Fall-to-MISO Valid
t
CSS
20
ns
SS Leading Time Before the First
SCLK Edge
t
L
30
ns
SS Trailing Time After the Last
SCLK Edge
t
T
30
ns
Data-In Setup Time
t
DS
5
ns
Data-In Hold Time
t
DH
10
ns
SS Pulse High
t
CSW
200
ns
SCLK Fall-to-MISO Propagation
Delay
t
DO
14.2
ns
SCLK Fall-to-MOSI Propagation
Delay
t
DI
14.2
ns
SCLK Rise-to-MOSI Drive
t
ON
3.5
ns
SS High-to-MOSI High
Impedance
t
OFF
20
ns
SUSPEND TIMING CHARACTERISTICS
Time-to-Enter Suspend
PWRDOWN = 1 to oscillator stop
5
µs
Time-to-Exit Suspend
PWRDOWN = 1 to 0 to OSCOKIRQ (Note 5)
3
ms
TIMING CHARACTERISTICS
(
V
CC
= +3V to +3.6V, V
L
= +1.71V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V, V
L
=
+2.5V, T
A
= +25
°C.) (Note 1
)
*33pF capacitor will not be required after redesign.