ST7FLCD1 datasheet(88/95 Pages) STMICROELECTRONICS

88 / 95 page

Electrical Characteristics

ST7FLCD1

88/95

For most applications PI/O<PINT and may be neglected. PI/O may be significant if the device is

configured to drive Darlington bases or sink LED Loads. An approximate relationship between PD

and TJ (if PI/O is neglected) is given by:

PD = K÷ (TJ + 273°C) (2)

Therefore:

K = PD x (TA + 273°C) + θJA x PD

2 (3)

Where:

● K is a constant for the particular part, which may be determined from equation (3) by

measuring PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ ay

be obtained by solving equations (1) and (2) iteratively for any value of TA.

17.3

Thermal Characteristics

17.4

AC/DC Electrical Characteristics

All voltages are referred to VSS and TA = 0 to +70°C (unless otherwise specified)

Table 33: Thermal Characteristics

Symbol

Package

Value

Unit

θJA

28-pin Small Outline Packqge (SO28)

°C/W

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

General

VDD

Operating Supply Voltage

4.5

5.5

Operating Voltage for FLASH access

READ

3.8

WRITE/ERASE

4.5

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

Control Timing

fOSC

External frequency

MHz

fCPU

Internal frequency

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

50000

6.25

3200000

400

tCPU

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