ST7540 datasheet(13/44 Pages) STMICROELECTRONICS

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ST7540

Electrical characteristics

13/44

5V Voltage regulator

VDC

Linear regulator output

voltage

0 < Io < 50mA

7.5V < VCC < 13.5V

-5%

5.05

+5%

3.3V Voltage regulator

VDD

Linear regulator output

voltage

0 < Io < 50mA

7.5V < VCC < 13.5V

-5%

3.3

+5%

Other functions

TRSTO

Reset time

See Figure 23;

Xtal = 16MHz

TWD

Watch-dog pulse width See Figure 23

125

TWM

Watch-dog pulse

period

Minimum value.

See Figure 23

250

Maximum value.

See Figure 23

1490

TWO

Watch-dog time out

See Figure 23

1.5

TOUT

TX time out

Control register bit 7

and bit 8

TOFF

Time Out OFF time

Figure 22

125

TOFFD

RxTx 0->1 vs. time out

delay

Figure 22

µs

TCD

Carrier detection time

selectable by register

Control register

bit 9 and bit10

Figure 14

500

µs

TDCD

CD_PD Propagation

delay

Figure 14

300

500

µs

MCLK

Master clock output

selectable by register

Control register

bit 15 and bit 16

See Table 12

fclock

fclock/2

fclock/4

off

MHz

BAUD

Baud rate

Control register

bit 3 and bit 4

See Table 12

600

1200

2400

4800

Baud

Table 5. Electrical characteristics (continued)

( VDD = +5V, VCC =+9 V, VSS = SVSS = GND = 0V,-40°C ≤TA ≤85°C, TJ < 125°C,

unless otherwise specified)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

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