ST72774 datasheet(134/144 Pages) STMICROELECTRONICS

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ST72774/ST727754/ST72734

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6.2 AC/DC ELECTRICAL CHARACTERISTICS

A = 0 to +70°C unless otherwise specified)

Note 1: HALT mode no longer exists.

Note 2: The USB cell must be put in suspend mode as well as the MCU in HALT mode. Since the latter no longer exists

for enhanced arcing protection, the measurement of the USB suspend consumption parameter is no longer relevant.

Note: : The minimum period tILIL should not be less than the number of cycle times it takes to execute the interrupt service

routine plus 21 cycles.

GENERAL

Symbol

Parameter

Conditions

Min

Typ.

Max

Unit

VDD

Operating Supply Voltage

RUN & WAIT mode

4.0

5.5

IDD

CPU RUN mode

I/O in input mode

VDD = 5V

fCPU = 8 MHz,

TA = 20

° C

CPU WAIT mode

CPU HALT mode (see Note 1)

N/A

USB Suspend mode (see Note 2)

N/A

CONTROL TIMING

Symbol

Parameter

Conditions

Value

Unit

Min

Typ.

Max

fOSC

fCPU

Frequency of Operation:

external frequency

internal frequency

fOSC= 24MHz

fOSC=12MHz

MHz

tBU

Startup Time Built-Up Time

Crystal Resonator

tRL

External RESET

Input pulse Width

1000

tPORL

Internal Power Reset Duration

4096

tCPU

tPOWL

Watchdog RESET

Output Pulse Width

500

tDOG

Watchdog Time-out

fCPU = 8 MHz

49152

3145728

384

tCPU

tILIL

Interrupt Pulse Period

(1)

tCPU

tOXOV

Crystal Oscillator

Start-up Time

tDDR

Power up rise time

VDD min

100

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