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UM3243 Datasheet(PDF) 7 Page - Union Semiconductor, Inc.

Part No. UM3243
Description  Low Supply Current, 3V to 5.5V, 250kbps, 3-Driver/5-Receiver, Enhanced ESD Protection Smart RS-232 Transceivers
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Maker  UNIONSEMI [Union Semiconductor, Inc.]
Homepage  http://www.union-ic.com
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UM3243 Datasheet(HTML) 7 Page - Union Semiconductor, Inc.

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http://www.union-ic.com Rev.01 Mar.2015
7/22
UM3243
Pin Configurations
C2+
C2-
V-
RIN1
RIN2
RIN3
RIN4
RIN5
TOUT1
TOUT2
TOUT3
TIN3
TIN2
TIN1
ROUT5
ROUT4
ROUT3
ROUT2
ROUT1
ROUT2B
INVALID
FORCEOFF
FORCEON
C1-
GND
VCC
V+
C1+
27
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
28
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
32 31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RIN1
RIN2
RIN3
RIN4
RIN5
TOUT1
TOUT2
TOUT3
ROUT2
ROUT1
ROUT2B
INVALID
FORCEOFF
FORCEON
C1-
GND
SSOP28/TSSOP28/SOP28 (Top View)
QFN32 5.0×5.0 (Top View)
Pin Description
Pin No.
Pin Name
Function
UM3243EEAS/EEUS/EESS
UM3243EEQA
1
29
C2+
Positive terminal of inverting charge-pump
capacitor
2
30
C2-
Negative terminal of inverting charge-pump
capacitor
3
31
V-
Negative voltage generated by the charge pump
4-8
1-5
RIN_
RS-232 Receiver Inputs
9,10,11
6,7,8
TOUT_
RS-232 Transmitter Outputs
12,13,14
10,11,12
TIN_
TTL/CMOS Transmitter Inputs
15-19
13,14,15,17,18
ROUT_
TTL/CMOS Receiver Outputs
20
19
ROUT2B
Non-Inverting
Receiver
Output—active
in
Power-Off
21
20
INVALID
_______________
Output of the valid signal detector. INVALID
_______________
is enabled high if a valid RS-232 level is
present on any receiver inputs.
22
21
FORCEOFF
__________________
Drive low to shut down transmitters and
on-board power supply. This overrides all
Automatic
circuitry
and
FORCEON
(See
Function Tables).
23
22
FORCEON
Drive high to override automatic circuitry
keeping transmitters on
( FORCEOFF
__________________
must be high) (See Function
Tables).
24
23
C1-
Negative terminal of the voltage doubler
charge-pump capacitor
25
24
GND
Ground
26
26
VCC
+3.0V to +5.5V Supply Voltage
27
27
V+
Positive voltage generated by the charge pump
28
28
C1+
Positive
terminal
of
the
voltage
doubler
charge-pump capacitor
-
9,16,25,32
NC
No connected.


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