ST3243B datasheet(7/22 Pages) STMICROELECTRONICS

7 / 22 page

ST3243B - ST3243C

Electrical characteristics

7/22

tinvh

Receiver positive or negative

threshold to INVALID HIGH

IOUT = -1mA

tinvL

Receiver positive or negative

threshold to INVALID LOW

Table 7.

Auto-power-down electrical characteristics

(C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical

values are referred to TA = 25 °C

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Table 8.

Transmitter electrical characteristics

(C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85°C, unless otherwise specified. Typical

values are referred to TA = 25 °C

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTOUT

Output voltage swing

All transmitter outputs are loaded with

Ω to GND

± 5

± 5.4

ROUT

Output Resistance

VCC = V+ = V- = 0V, VOUT = ± 2V

300

10M

ISC

Output short circuit current

± 35

± 60

VOT

Transmitter output voltage

T1IN = T2IN = GND, T3IN = VCC

T3OUT loaded with 3K

Ω to GND

T1OUT and T2OUT loaded with 2.5mA

each

± 5V

Table 9.

Receiver electrical characteristics

(C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical

values are referred to TA = 25 °C

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VRIN

Receiver input voltage

operating range

-25

VRIL

RS-232 Input threshold low

TA = 25°C, VCC = 3.3V

TA = 25°C, VCC = 5.0V

0.6

0.8

1.2

VRIH

RS-232 Input threshold high

TA = 25°C, VCC = 3.3V

TA = 25°C, VCC = 5.0V

1.5

1.8

2.4

VRIHYS

Input hysteresis

0.5

RRIN

Input resistance

TA = 25°C

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