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ST3243 Datenblatt(PDF) 4 Page - STMicroelectronics

Teilenummer ST3243
Bauteilbeschribung  3 to 5.5V, 400Kbps, RS-232 Transceiver with auto-powerdown
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST3243 Datenblatt(HTML) 4 Page - STMicroelectronics

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Pin configuration
ST3243
4/20
1.1
Truth table
Note:
If the part is in auto-powerdown mode (FORCE OFF = VCC, FORCE ON = GND) it is
shutdown, if no valid RS-232 levels are present on all receiver input
18
R2OUT
Second receiver output voltage
19
R1OUT
First receiver output voltage
20
R2OUTB
Non-inverting complementary receiver output, always active for wake-up
21
INVALID
Output of the valid signal detector. Indicates if a valid RS-232 level is present
on receiver inputs logic "1"
22
FORCEOFF
Drive low to shut down transmitters and on-board power supply. This over-
rides all automatic circuitry and FORCEON
23
FORCEON
Drive high to override automatic circuitry keeping transmitters on
(FORCEOFF must be high)
24
C1-
Negative terminal of voltage-charge pump capacitor
25
GND
Ground
26
VCC
Supply voltage
27
V+
5.5V Generated by the charge pump
28
C1+
Positive terminal of voltage-charge pump capacitor
Table 1.
Pin description
Pin n°
Symbol
Name and function
Table 2.
FORCE OFF
TOUT
ROUT
R2OUTB
0
HIGH Z
HIGH Z
ACTIVE Note:
1
ACTIVE Note:
ACTIVE Note:
ACTIVE Note:


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