SN65C23243, SN75C23243
3 V TO 5.5 V DUAL RS 232 PORT
SLLS513A - AUGUST 2001 - REVISED MARCH 2004
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Single-Chip and Single-Supply Interface for
Two IBM
PC/AT Serial Ports
D
Meet or Exceed the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
D
Operate With 3-V to 5.5-V V
CC
Supply
D
Always-Active Noninverting Receiver
Output (ROUT2) Per Port
D
Operate Up To 250 kbit/s
D
Low Standby Current . . . 1
A Typical
D
External Capacitors . . . 4
0.22
F
D
Accept 5-V Logic Input With 3.3-V Supply
D
Allow for Flexible Power Down of Either
Serial Port
D
Serial-Mouse Driveability
D
RS-232 Bus-Pin ESD Protection Exceeds
15 kV Using Human-Body Model (HBM)
D
Applications
- Battery-Powered Systems, Notebooks,
Laptops, Palmtop PCs, and Hand-Held
Equipment
description/ordering information
The SN65C23243 and SN75C23243 consist of
two ports, each containing three line drivers and
five line receivers, and a dual charge-pump circuit
with
15-kV ESD protection pin to pin (serial-port
connection pins, including GND). These devices meet the requirements of TIA/EIA-232-F and provide the
electrical interface between an asynchronous communication controller and the serial-port connector. This
combination of drivers and receivers matches that needed for two typical serial ports used in an IBM PC/AT, or
compatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V
supply. In addition, these devices include an always-active noninverting output (ROUT2) per port, which allows
applications using the ring indicator to transmit data while the devices are powered down. The devices operate
at data signaling rates up to 250 kbit/s and a maximum of 30-V/
s driver output slew-rate.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SSOP (DL)
Tube of 25
SN75C23243DL
75C23243
-0
C to 70
C
SSOP (DL)
Reel of 1000
SN75C23243DLR
75C23243
-0 C to 70 C
TSSOP (DGG)
Reel of 2000
SN75C23243DGGR
75C23243
SSOP (DL)
Tube of 25
SN65C23243DL
65C23243
-40
C to 85
C
SSOP (DL)
Reel of 1000
SN65C23243DLR
65C23243
-40 C to 85 C
TSSOP (DGG)
Reel of 2000
SN65C23243DGGR
65C23243
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright
2004, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DGG OR DL PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
RIN5A
RIN4A
RIN3A
RIN2A
RIN1A
INVA
DOUT3A
DOUT2A
DOUT1A
FORCEOFFA
C2-
C2+
GND
V
CC
FORCEOFFB
DOUT1B
DOUT2B
DOUT3B
INVB
RIN1B
RIN2B
RIN3B
RIN4B
RIN5B
ROUT5A
ROUT4A
ROUT3A
ROUT2A
ROUT1A
ROUT2A
DIN3A
DIN2A
DIN1A
FORCEON
V-
V+
C1+
C1-
GND
DIN1B
DIN2B
DIN3B
ROUT2B
ROUT1B
ROUT2B
ROUT3B
ROUT4B
ROUT5B
IBM is a trademark of International Business Machines Corporation.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN65C23243, SN75C23243
3 V TO 5.5 V DUAL RS 232 PORT
SLLS513A - AUGUST 2001 - REVISED MARCH 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
Flexible control options for power management are available when either or both serial ports are inactive. The
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the device does not sense a valid RS-232 signal, the driver outputs of its respective port are
disabled. If FORCEOFF is set low, both drivers and receivers (except ROUT2) are shut off, and the supply
current is reduced to 1
A. Disconnecting the serial port or turning off the peripheral drivers causes the
auto-powerdown condition to occur.
Auto-powerdown can be disabled when FORCEON and FORCEOFF are high and should be done when driving
a serial mouse. With auto-powerdown enabled, the RS-232 port is activated automatically when a valid signal
is applied to any respective receiver input. The INV output is used to notify the user if an RS-232 signal is present
at any receiver input. INV is high (valid data) if any receiver input voltage is greater than 2.7 V or less than -2.7
V
or has been between -0.3 V and 0.3 V for less than 30
s. INV is low (invalid data) if all receiver input voltages
are between -0.3 V and 0.3 V for more than 30
s. Refer to Figure 5 for receiver input levels.
Function Tables
EACH DRIVER
(each port)
INPUTS
OUTPUT
DIN
FORCEON
FORCEOFF
VALID RIN
RS-232 LEVEL
OUTPUT
DOUT
DRIVER STATUS
X
X
L
X
Z
Powered off
L
H
H
X
H
Normal operation with
H
H
H
X
L
Normal operation with
auto-powerdown disabled
L
L
H
Yes
H
Normal operation with
H
L
H
Yes
L
Normal operation with
auto-powerdown enabled
L
L
H
No
Z
Powered off by
H
L
H
No
Z
Powered off by
auto-powerdown feature
H = high level, L = low level, X = irrelevant, Z = high impedance
EACH RECEIVER
(each port)
INPUTS
OUTPUTS
RIN2
RIN1,
RIN3-RIN5
FORCEOFF
VALID RIN
RS-232 LEVEL
ROUT2
ROUT
RECEIVER STATUS
L
X
L
X
L
Z
Powered off while
H
X
L
X
H
Z
Powered off while
ROUT2 is active
L
L
H
Yes
L
H
L
H
H
Yes
L
L
Normal operation with
H
L
H
Yes
H
H
Normal operation with
auto-powerdown
disabled/enabled
H
H
H
Yes
H
L
auto-powerdown
disabled/enabled
Open
Open
H
No
L
H
H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected
driver off
SN65C23243, SN75C23243
3 V TO 5.5 V DUAL RS 232 PORT
SLLS513A - AUGUST 2001 - REVISED MARCH 2004
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic diagram (positive logic)
Auto-powerdown
Charge
Pump
48
ROUT5A
47
ROUT4A
46
ROUT3A
45
ROUT2A
44
ROUT1A
43
ROUT2A
42
DIN3A
41
DIN2A
40
DIN1A
39
FORCEON
Auto-powerdown
25
ROUT5B
26
ROUT4B
27
ROUT3B
28
ROUT2B
29
ROUT1B
30
ROUT2B
31
DIN3B
32
DIN2B
33
DIN1B
24
23
22
21
20
RIN5B
RIN4B
RIN3B
RIN2B
RIN1B
18
17
16
19
DOUT3B
DOUT2B
DOUT1B
INVB
15
10
FORCEOFFB
FORCEOFFA
7
8
9
DOUT3A
DOUT2A
DOUT1A
6
INVA
1
2
3
4
5
RIN5A
RIN4A
RIN3A
RIN2A
RIN1A
SN65C23243, SN75C23243
3 V TO 5.5 V DUAL RS 232 PORT
SLLS513A - AUGUST 2001 - REVISED MARCH 2004
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing
Figure 1 shows how the two independent serial ports can be enabled or disabled. As shown by the logic states,
depending on the FORCEOFF, FORCEON, and receiver input levels, either port can be powered down.
Intermediate receiver input levels indicate a 0-V input. Also, it is assumed a pulldown resistor to ground is used
for the receiver outputs. The INV pin goes low when its respective receiver input does not supply a valid RS-232
level. For simplicity, voltage levels, timing differences, and input/output edge rates are not shown.
DINB
DINA
RIN2B
RIN2A
FORCEON
FORCEOFFB
FORCEOFFA
ROUT2A
ROUT2A
ROUT2B
ROUT2B
DOUTA
DOUTB
INVA
INVB
0 V
0 V
0 V
0 V
NOTES: A. Ports A and B manually powered off
B. Port A manually powered off, port B in normal operation with auto-powerdown enabled
C. Port B powered off by auto-powerdown, port A in normal operation with auto-powerdown enabled
D. Port A in normal operation with auto-powerdown disabled, port B manually powered off
E. Ports A and B in normal operation with auto-powerdown disabled
A
B
C
D
E
Figure 1. Timing Diagram
SN65C23243, SN75C23243
3 V TO 5.5 V DUAL RS 232 PORT
SLLS513A - AUGUST 2001 - REVISED MARCH 2004
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
(see Note 1)
-0.3 V to 6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive output supply voltage range, V+ (see Note 1)
-0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Negative output supply voltage, V- (see Note 1)
0.3 V to -7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage difference, V+
-
V- (see Note 1)
13 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
: Driver (FORCEOFF, FORCEON)
-0.3 V to 6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver
-25 V to 25 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
: Driver
-13.2 V to 13.2 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver (INV)
-0.3 V to V
CC
+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Notes 2 and 3): DGG package
70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . .
DL package
63
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating virtual junction temperature, T
J
150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
-65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. All voltages are with respect to network GND.
2. Maximum power dissipation is a function of TJ(max),
JA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) - TA)/
JA. Operating at the absolute maximum TJ of 150
C can affect reliability.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 4 and Figure 7)
MIN
NOM
MAX
UNIT
Supply voltage
VCC = 3.3 V
3
3.3
3.6
V
Supply voltage
VCC = 5 V
4.5
5
5.5
V
Driver and control high-level input voltage, VIH
DIN, FORCEOFF, FORCEON
VCC = 3.3 V
2
V
Driver and control high-level input voltage, VIH
DIN, FORCEOFF, FORCEON
VCC = 5 V
2.4
V
Driver and control low-level input voltage, VIL
DIN, FORCEOFF, FORCEON
0.8
V
Driver and control input voltage, VI
DIN, FORCEOFF, FORCEON
0
5.5
V
Receiver input voltage, VI
RIN
-25
25
V
Operating free-air temperature, TA
SN75C23243
0
70
C
Operating free-air temperature, TA
SN65C23243
-40
85
C
NOTE 4: Test conditions are C1-C4 = 0.22
F at VCC = 3.3 V
0.3 V; C1 = 0.047
F, C2-C4 = 0.33
F at VCC = 5 V
0.5 V.
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 4 and Figure 7)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
II
Input leakage current
FORCEOFF, FORCEON
0.01
1
A
Auto-powerdown disabled
No load,
FORCEOFF and FORCEON at VCC
0.6
2
mA
ICC
Supply current
(T = 25 C)
Powered off
No load, FORCEOFF at GND
1
20
ICC
Supply current
(TA = 25
C)
Auto-powerdown enabled
No load, FORCEOFF at VCC,
FORCEON at GND,
All RIN are open or grounded
1
20
A
All typical values are at VCC = 3.3 V or VCC = 5 V and TA = 25
C.
NOTE 4: Test conditions are C1-C4 = 0.22
F at VCC = 3.3 V
0.3 V; C1 = 0.047
F, C2-C4 = 0.33
F at VCC = 5 V
0.5 V.
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