ST3243B_11 datasheet(8/17 Pages) STMICROELECTRONICS

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Electrical characteristics

ST3243B ST3243C

8/17

Doc ID 7539 Rev 10

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.

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.

tWU

Receiver threshold to

transmitter enabled

IOUT = 1.6 mA

250

µs

tINVH

Receiver positive or negative

threshold to INVALID HIGH

IOUT = -1 mA

µs

tINVL

Receiver positive or negative

threshold to INVALID LOW

µs

Table 7.

Auto-power-down electrical characteristics (continued)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Table 8.

Transmitter electrical characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTOUT

Output voltage swing

All transmitter outputs are loaded with

3 k

Ω to GND

± 5

± 5.4

ROUT

Output resistance

VCC = V+ = V- = 0 V, VOUT = ± 2 V

300

10 M

ISC

Output short-circuit current

± 35

± 60

VOT

Transmitter output voltage

T1IN = T2IN = GND, T3IN = VCC

T3OUT loaded with 3 k

Ω to GND

T1OUT and T2OUT loaded with 2.5 mA

each

± 5V

Table 9.

Receiver electrical characteristics

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 = 3.3 V

TA = 25 °C, VCC = 5.0 V

0.6

0.8

1.2

VRIH

RS-232 Input threshold high

TA = 25 °C, VCC = 3.3 V

TA = 25 °C, VCC = 5.0 V

1.5

1.8

2.4

VRIHYS

Input hysteresis

0.5

RRIN

Input resistance

TA = 25 °C

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