DS89C420 Datasheet, PDF (52/59 Pages) Dallas Semiconductor – Ultra-High-Speed Microcontroller

EXTERNAL CLOCK CHARACTERISTICS
(V_CC = 4.5V to 5.5V; T_A = -40°C to +85°C)*
PARAMETER
SYMBOL
MIN
Clock High Time
Clock Low Time
Clock Rise Time
Clock Fall Time
t_CHCX
10
t_CLCX
10
t_CLCH
t_CHCL
MAX
5
5
*Specifications to -40°C are guaranteed by design and not production tested.
UNITS
ns
ns
ns
ns
DS89C420
SERIAL PORT MODE 0 TIMING CHARACTERISTICS
(V_CC = 4.5V to 5.5V; T_A = -40°C to +85°C)*
PARAMETER
33MHz
SYMBOL
MIN MAX
VARIABLE
MIN
MAX
Clock Cycle Time
SM2 = 0
SM2 = 1
t_XLXL
360
120
12t_CLCL
4t_CLCL
Output Data Setup to Clock Rising
SM2 = 0
SM2 = 1
Output Data Hold to Clock Rising
SM2 = 0
SM2 = 1
Input Data Hold after Clock Rising
SM2 = 0
SM2 = 1
200
t_QVXH
40
t_XHQX
50
20
t_XHDX
0
0
10t_CLCL -
100
3t_CLCL - 10
2t_CLCL - 10
t_CLCL - 100
0
0
MAX
ns
ns
ns
ns
Clock Rising Edge to Input Data Valid
SM2 = 0
t_XHDV
200
SM2 = 1
40
*Specifications to -40°C are guaranteed by design and not production tested.
10t_CLCL -
100
ns
3t_CLCL - 50
Note: SM2 is the serial port 0, mode bit 2. When serial port 0 is operating in mode 0 (SM0 = SM1 = 0), SM2 determines the number of crystal clocks in a
serial-port clock cycle.
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