HCS500-I Datasheet, PDF (22/34 Pages) Microchip Technology – KEELOQ Code Hopping Decoder

HCS500
8.1 AC Electrical Characteristics
8.1.1 COMMAND MODE ACTIVATION
Standard Operating Conditions (unless otherwise specified):
Commercial (C): 0°C ≤ TA ≤ +70°C
Industrial (I):
-40°C ≤ TA ≤ +85°C
Symbol
Parameters
Min
Typ
Max
Units
TREQ Command request time
0.0150
TRESP Microcontroller request
—
acknowledge time
TACK Decoder acknowledge time
—
TSTART Start Command mode to first
20
command bit
TCLKH Clock high time
20
TCLKL Clock low time
20
FCLK Clock frequency
500
TDS Data hold time
14
TCMD Command validate time
—
TADDR Address validate time
—
TDATA Data validate time
—
* These parameters are characterized but not tested.
—
500
ms
—
1
ms
—
30
µs
—
1000
µs
—
1000
µs
—
1000
µs
—
25000
Hz
—
—
µs
—
10
µs
—
10
µs
—
10
µs
8.1.2 READ FROM USER EEPROM COMMAND
Standard Operating Conditions (unless otherwise specified):
Commercial (C): 0°C ≤ TA ≤ +70°C
Industrial (I):
-40°C ð TA ≤ +85°C
Symbol
Parameters
Min
Typ
Max
Units
TRD Decoder EEPROM read time
400
* These parameters are characterized but not tested.
—
1500
µs
8.1.3 WRITE TO USER EEPROM COMMAND
Standard Operating Conditions (unless otherwise specified):
Commercial (C): 0°C ≤ TA ≤ +70°C
Industrial (I):
-40°C ≤ TA ≤ +85°C
Symbol
Parameters
Min
Typ
Max
Units
TWR Write command activation time
20
TACK EEPROM write acknowledge time
—
TRESP
Microcontroller acknowledge
response time
20
—
1000
µs
—
10
ms
—
1000
µs
TACK2
Decoder response
acknowledge time
—
—
10
µs
* These parameters are characterized but not tested.
DS40153C-page 22
© 2002 Microchip Technology Inc.