XR20M1280 Datasheet, PDF (56/63 Pages) Exar Corporation – I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS

XR20M1280
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
REV. 1.0.0
AC ELECTRICAL CHARACTERISTICS - SPI-BUS TIMING SPECIFICATIONS
Unless otherwise noted: TA=-40^o to +85^oC, Vcc=1.62 - 3.63V
SYMBOL
f_SCL
T_TR
T_CSS
T_CSH
T_DO
T_DS
T_DH
T_CP
T_CH
T_CL
T_CSW
T_D9
T_D10
T_D11
T_D12
T_D13
T_D14
Operating frequency
PARAMETER
CS# HIGH to SO three-state time
CS# to SCL setup time
CS# to SCL hold time
SCL fall to SO valid time
SI to SCL setup time
SI to SCL hold time
SCL period
SCL HIGH time
SCL LOW time
CS# HIGH pulse width
SPI output data valid
SPI modem output data valid
SPI transmit interrupt clear
SPI modem input interrupt clear
SPI input pin interrupt clear
SPI receive interrupt clear
MIN
25
20
10
10
40
20
20
25
200
200
200
200
200
200
MAX
26
100
100
UNIT
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CONDITIONS
C_L = 15 pF
C_L = 15 pF
T_CH + T_CL
FIGURE 29. SPI-BUS TIMING
CS#
TCSH
TCSS
SCL
SI
TDS
TDH
...
TCL
TCH
...
...
SO
...
TCSH
TCSW
TDO
TTR
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