DS89C420_02 Datasheet, PDF (52/58 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

Table 18. EXTERNAL CLOCK CHARACTERISTICS
(V_CC = 4.5V to 5.5V; T _A = -40°C to +85°C)*
PARAMETER
SYMBOL MIN MAX
UNITS
Clock High Time
t_CHCX
10
ns
Clock Low Time
t_CLCX
10
ns
Clock Rise Time
t_CLCH
5
ns
Clock Fall Time
t_CHCL
5
ns
*Specifications to -40°C are guaranteed by design and not production tested.
DS89C420
Table 19. SERIAL PORT MODE 0 TIMING CHARACTERISTICS
(V_CC = 4.5V to 5.5V; T _A = -40°C to +85°C)*
PARAMETER
33MHz
VARIABLE
SYMBOL
MAX
MIN MAX MIN
MAX
Clock Cycle Time
SM2 = 0
SM2 = 1
t_XLXL ³⁶⁰
120
Output Data Setup to Clock Rising
SM2 = 0
SM2 = 1
t_QVXH ²⁰⁰
40
Output Data Hold to Clock Rising
SM2 = 0
SM2 = 1
t_XHQX ⁵⁰
20
Input Data Hold after Clock Rising
SM2 = 0
SM2 = 1
t_XHDX ⁰
0
Clock Rising Edge to Input Data Valid
SM2 = 0
t_XHDV
SM2 = 1
*Specifications to -40°C are guaranteed by design and not production tested.
12t_CLCL
ns
4t_CLCL
10t_CLCL - 100
ns
3t_CLCL - 10
2t_CLCL - 10
ns
t_CLCL - 100
0
ns
0
200
10t_CLCL - 100 _ns
40
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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