ST3243B Просмотр технического описания (PDF) - STMicroelectronics
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ST3243B Datasheet PDF : 22 Pages
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ST3243B - ST3243C
Electrical characteristics
Table 7.
Symbol
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
Parameter
Test conditions
Min. Typ. Max. Unit
tinvh
Receiver positive or negative
threshold to INVALID HIGH
IOUT = -1mA
tinvL
Receiver positive or negative
threshold to INVALID LOW
1
ms
30
ms
Table 8.
Symbol
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
Parameter
Test conditions
Min. Typ. Max. Unit
VTOUT Output voltage swing
ROUT
ISC
Output Resistance
Output short circuit current
VOT Transmitter output voltage
All transmitter outputs are loaded with
3KΩ to GND
VCC = V+ = V- = 0V, VOUT = ± 2V
T1IN = T2IN = GND, T3IN = VCC
T3OUT loaded with 3KΩ to GND
T1OUT and T2OUT loaded with 2.5mA
each
± 5 ± 5.4
V
300 10M
Ω
± 35 ± 60 mA
±5
V
Table 9.
Symbol
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
Parameter
Test conditions
Min. Typ. Max. Unit
VRIN
Receiver input voltage
operating range
VRIL RS-232 Input threshold low
VRIH RS-232 Input threshold high
VRIHYS Input hysteresis
RRIN Input resistance
TA = 25°C, VCC = 3.3V
TA = 25°C, VCC = 5.0V
TA = 25°C, VCC = 3.3V
TA = 25°C, VCC = 5.0V
TA = 25°C
-25
25
V
0.6 1.2
0.8 1.2
V
1.5 2.4
1.8 2.4
V
0.5
V
3
5
7
kΩ
7/22
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