MAX3420E Просмотр технического описания (PDF) - Maxim Integrated
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MAX3420E Datasheet PDF : 23 Pages
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MAX3420E
USB Peripheral Controller with SPI Interface
Timing Characteristics
(VCC = +3V to +3.6V, VL = +1.71V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V,
VL = +2.5V, TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
USB TRANSMITTER TIMING CHARACTERISTICS
D+, D- Rise Time
tRISE CL = 50pF, Figures 6 and 7
D+, D- Fall Time
tFALL CL = 50pF, Figures 6 and 7
Rise/Fall-Time Matching
CL = 50pF, Figures 6 and 7 (Note 2)
Output-Signal Crossover Voltage
CL = 50pF, Figures 6 and 7 (Note 2)
SPI BUS TIMING CHARACTERISTICS (VL = 2.5V) (Figures 8 and 9) (Note 3)
Serial Clock (SCLK) Period (Note 4)
tCP
VL = 1.71V
VL = 2.5V
SCLK Pulse-Width High
tCH
SCLK Pulse-Width Low
tCL
SS Fall to MISO Valid
tCSS
SS Leading Time Before the First
SCLK Edge
tL
MIN TYP MAX UNITS
4
20
ns
4
20
ns
90
110
%
1.3
2.0
V
77.0
ns
38.4
17
ns
17
ns
20
ns
30
ns
SS Trailing Time After the Last
SCLK Edge
tT
30
ns
Data-In Setup Time
Data-In Hold Time
SS Pulse High
SCLK Fall to MISO Propagation
Delay
tDS
tDH
tCSW
tDO
5
ns
10
ns
200
ns
14.2
ns
SCLK Fall to MOSI Propagation
Delay
tDI
14.2
ns
SCLK Fall to MOSI Drive
tON
SS High to MOSI High Impedance tOFF
SUSPEND TIMING CHARACTERISTICS
3.5
ns
20
ns
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
Note 1: Parameters are 100% production tested at TA = +25°C, and guaranteed by correlation over temperature.
Note 2: Design guaranteed by bench testing. Limits are not production tested.
Note 3: At VL = 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.
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