ST7293 datasheet(56/69 Pages) STMICROELECTRONICS

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ST72E94 - ST72T94

2.4 AC ELECTRICAL CHARACTERISTICS (T

A = -40°C to +85°C unless otherwise specified)

Notes:

1. RUN (Operating) IDD, WAIT IDD measured using external square wave clock all inputs 0.2V from rail, no DC load, less than 50pF on all

outputs, CI = 20pF on OSCout.

2. WAIT, HALT all I/O configured as inputs, VIL = 0.2V, VIH =VDD -0.2V.

3. HALT, OSCin = VSS.

2.5 Control Timing (T

A = -40°C to +85°C unless otherwise specified)

Note 1. 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.

Symbol

Parameter

Test Conditions

Value

Unit

Min.

Typ.

Max.

VDD

Operating Supply Voltage

RUN Mode

HALT Mode

EEPROM Write

EEPROM Read

3.0

2.0

3.0

5.5

IDD

Supply Current (1) (2) (3)

RUN Mode

VDD=5V,fOSC=4MHz

VDD=3.0V,fOSC=455KHz

WAIT Mode

VDD=5V,fOSC=4MHz

VDD=3.0V,fOSC=455KHz

HALT MODE

VDD=5V,TA=70°C

1.8

0.9

2.5

0.7

1.5

500

µA

Symbol

Parameter

Test Condition s

Value

Unit

Min.

Typ.

Max.

OSC

Frequency of Operation

VDD=5V

VDD=3.0V

MHz

tILCH

HALT Mode Recovery

Startup Time

Crystal Oscillator

tRL

External RESET Input

Pulse Width

1.5

tCYC

tPORL

Power RESET Output

4096

tCYC

tDOGL

Watchdog RESET

Output Pulse Width

1.5

tDOG

Watchdog Time-out

6144

7168

tCYC

tILIH

Interrupt Pulse Width

INT

PORTC

125

tILIL

Interrupt Pulse Period

(1)

tCYC

tOXOV

Crystal Oscillator

Startup Time

tDDR

Supply Rise Time

10% to 90%

0.01

100

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