Rainbow Electronics DS89C450 - Manual (Page 11)

DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
11 of 48
POWER-CYCLE TIMING CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
O
= -40°C to +85°C.)
PARAMETER SYMBOL MIN TYP MAX UNITS
Crystal Startup Time (Note 18) t
CSU
8 ms
Power-On Reset Delay (Note 19) t
POR
65,536 t
CLCL
Note 18: Startup time for a crystal varies with load capacitance and manufacturer. The time shown is for an 11.0592MHz crystal manufactured
by Fox Electronics.
Note 19: Reset delay is a synchronous counter of crystal oscillations after crystal startup. Counting begins when the level on the XTAL1 pin
meets the V
IH2
criteria. At 33MHz, this time is 1.99ms.
FLASH MEMORY PROGRAMMING CHARACTERISTICS
(V
CC
= 4.5V to 5.5V)
PARAMETER SYMBOL MIN TYP MAX UNITS
Data Retention (Note 20) t
DR
100 years
Write/Erase Endurance t
ENDURE
20,000 cycles
Program/Time t
PROG
40 ms
Erase Time t
ERASE
4 ms
Note 20: At room temperature.