Datasheet

21
2487D–MICRO–6/08
AT89S51
21. Serial Programming Characteristics
Figure 21-1. Serial Programming Timing
MOSI
MISO
SCK
t
OVSH
t
SHSL
t
SLSH
t
SHOX
t
SLIV
Table 21-1. Serial Programming Characteristics, T
A
= -40⋅ C to 85⋅ C, V
CC
= 4.0 - 5.5V (Unless Otherwise Noted)
Symbol Parameter Min Typ Max Units
1/t
CLCL
Oscillator Frequency 3 33 MHz
t
CLCL
Oscillator Period 30 ns
t
SHSL
SCK Pulse Width High 8 t
CLCL
ns
t
SLSH
SCK Pulse Width Low 8 t
CLCL
ns
t
OVSH
MOSI Setup to SCK High t
CLCL
ns
t
SHOX
MOSI Hold after SCK High 2 t
CLCL
ns
t
SLIV
SCK Low to MISO Valid 10 16 32 ns
t
ERASE
Chip Erase Instruction Cycle Time 500 ms
t
SWC
Serial Byte Write Cycle Time 64 t
CLCL
+ 400 µs
22. Absolute Maximum Ratings*
Operating Temperature.................................. -55°C to +125°C
*NOTICE: Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability.
Storage Temperature ..................................... -65°C to +150°C
Voltage on Any Pin
with Respect to Ground .....................................-1.0V to +7.0V
Maximum Operating Voltage ............................................ 6.6V
DC Output Current...................................................... 15.0 mA