DS89C420_05 Datasheet, PDF (9/47 Pages) Maxim Integrated Products – 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
t_CHCX
10
Clock Low Time
t_CLCX
10
Clock Rise Time
t_CLCH
Clock Fall Time
t_CHCL
DS89C420 Ultra-High-Speed Microcontroller
MAX
5
5
UNITS
ns
ns
ns
ns
SERIAL PORT MODE 0 TIMING CHARACTERISTICS
(V_CC = 4.5V to 5.5V; T_A = -40°C to +85°C.)* (Figure 4)
PARAMETER
SYMBOL CONDITIONS
33MHz
MIN
MAX
VARIABLE
MIN
MAX
UNITS
Clock Cycle Time
t_XLXL
SM2 = 0
SM2 = 1
360
120
12t_CLCL
4t_CLCL
ns
Output Data Setup to
Clock Rising
t_QVXH
SM2 = 0
SM2 = 1
200
40
10t_CLCL -
100
3t_CLCL -
10
ns
Output Data Hold to Clock
Rising
t_XHQX
SM2 = 0
50
SM2 = 1
20
2t_CLCL -
10
t_CLCL -
100
ns
Input Data Hold after
Clock Rising
t_XHDX
SM2 = 0
SM2 = 1
0
0
0
0
ns
Clock Rising Edge to Input
Data Valid
t_XHDV
SM2 = 0
SM2 = 1
200
40
10t_CLCL -
100
3t_CLCL -
ns
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.
*Specifications to -40°C are guaranteed by design and not production tested.
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