Datasheet

MAX3421E
USB Peripheral/Host Controller
with SPI Interface
13
Maxim Integrated
Note 3: Parameters are 100% production tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 4: Guaranteed by bench testing. Limits are not production tested.
Note 5: At V
L
= 1.4V to 2.5V, derate all the SPI timing characteristics by 50%. Not production tested.
Note 6: The minimum period is derived from SPI timing parameters.
Note 7: Time-to-exit suspend is dependent on the crystal used.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
USB TRANSMITTER TIMING CHARACTERISTICS (FULL-SPEED MODE)
D+, D- Rise Time t
RISE
C
L
= 50pF, Figures 8 and 9 4 20 ns
D+, D- Fall Time t
FALL
C
L
= 50pF, Figures 8 and 9 4 20 ns
Rise-/Fall-Time Matching C
L
= 50pF, Figures 8 and 9 (Note 4) 90 110 %
Output-Signal Crossover Voltage C
L
= 50pF, Figures 8 and 9 (Note 4) 1.3 2.0 V
USB TRANSMITTER TIMING CHARACTERISTICS (HOST LOW-SPEED MODE)
D+, D- Rise Time t
RISE
200pF ≤ C
L
≤ 600pF, Figures 8 and 9 75 300 ns
D+, D- Fall Time t
FALL
200pF ≤ C
L
≤ 600pF, Figures 8 and 9 75 300 ns
Rise-/Fall-Time Matching 200p F ≤ C
L
≤ 600p F, Fi g ur es 8 and 9 80 120 %
Output-Signal Crossover Voltage 200p F ≤ C
L
≤ 600p F, Fi g ur es 8 and 9 1.3 2.0 V
SPI BUS TIMING CHARACTERISTICS (V
L
= 2.5V) (Figures 10 and 11) (Note 5)
V
L
> 2.5V 38.4
S eri al C l ock ( SC LK) P eri od ( N ote 6) t
CP
V
L
= 1.4V 77.7
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
5ns
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 Fall 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 7) 3 ms
TIMING CHARACTERISTICS
(V
CC
= +3V to +3.6V, V
L
= +1.4V 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 3)