DS14C335
+3.3V Supply TIA/EIA-232 3 x 5 Driver/Receiver
General Description
The DS14C335 is three driver, five receiver device which
conforms to TIA/EIA-232-E and CCITT V.28 standard speci-
fications. This device employs an internal DC-DC converter
to generate the necessary output levels from a +3.3V power
supply. A SHUTDOWN (SD) mode reduces the supply cur-
rent to 10 A maximum. In the SD mode, one receiver is ac-
tive, allowing ring indicator (RI) to be monitored. PC Board
space consumption is minimized by the availability of Shrink
Small Outline Packaging (SSOP).
This device's low power requirement and small footprint
makes it an ideal choice for Laptop and Notebook applica-
tions.
Features
n
Conforms to TIA/EIA-232-E and CCITT V.28
specifications
n
Operates with single +3.3V power supply
n
Low power requirement -- I
CC
20 mA maximum
n
SHUTDOWN mode -- I
CX
10 A maximum
n
One Receiver (R5) active during SHUTDOWN
n
Operates up to 128 kbps -- Lap-Link
Compatible
n
Flow through pinout
n
4V/s minimum Slew Rate guaranteed
n
Inter-operates with +5V UARTs
n
Available in 28-lead SSOP EIAJ Type II package
Connection Diagram
Functional Diagram
Lap-Link
is a registered trademark of Traveling Software.
DS14C335
DS011734-1
Order Number DS14C335MSA
See NS Package Number MSA28
DS011734-2
March 2000
DS14C335
+3.3V
Supply
TIA/EIA-23
23x5
Driver/Receiver
2000 National Semiconductor Corporation
DS011734
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
)
-0.3V to + 6V
V
+
Pin
(V
CC
-0.3V) to +14V
V
-
Pin
+0.3V to -14V
Input Voltage (DIN, SD)
-0.3V to + 5.5V
Driver Output Voltage
(V
+
+ 0.3V) to (V
-
-0.3V)
Receiver Input Voltage
25V
Receiver Output Voltage
-0.3V to (V
CC
+ 0.3V)
Junction Temperature
+150C
Storage Temperature Range
-65C to +150C
Lead Temperature
(Soldering 4 sec.)
+260C
Short Circuit Duration (D
OUT
)
continuous
Maximum Package Power Dissipation
@
+25C
SSOP MSA Package
1286 mW
Derate MSA Package 10.3 mW/C above +25C
ESD Rating
(HBM, 1.5 k
, 100 pF)
2.0 kV
Recommended Operating
Conditions
Min
Max
Units
Supply Voltage (V
CC
)
3.0
3.6
V
DC-DC Converter Capacitors
(C1C5)
0.47
F
Operating Free Air Temperature (T
A
)
DS14C335
0
+70
C
Electrical Characteristics
(Notes 2, 3)
Over recommended operating conditions, SD = 0.8V, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
DEVICE CHARACTERISTICS
V+
Positive Power Supply
No Load
D
IN
= 0.8V
+9.3
V
V-
Negative Power Supply
C1C5 = 0.47
F
D
IN
= 2.0V
-9.0
V
I
CC
Supply Current
No Load
11.5
20
mA
I
CX
SHUTDOWN Supply
Current
R
L
= 3 k
, SD = V
CC
, 5.5V
1.0
10
A
V
IH
High Level Enable
Voltage
SD
2.0
V
V
IL
Low Level Enable
Voltage
GND
0.8
V
I
IH
High Level Enable
Current
2.0V
V
IN
5.5V
+2.0
A
I
IL
Low Level Enable
Current
GND
V
IN
0.8V
-2.0
A
DRIVER CHARACTERISTICS
V
IH
High Level Input Voltage
D
IN
2.0
V
V
IL
Low Level Input Voltage
GND
0.8
V
I
IH
High Level Input Current
2.0V
V
IN
5.5V
+1.0
A
I
IL
Low Level Input Current
GND
V
IN
0.8V
-1.0
A
V
OH
High Level Output
Voltage
R
L
= 3 k
+5.0
+7.1
V
V
OL
Low Level Output
Voltage
-6.3
-5.0
V
I
OS+
Output High Short
V
O
= 0V, V
IN
= 0.8V (Note 7)
-40
-16.5
-8
mA
Circuit Current
I
OS-
Output Low Short
V
O
= 0V, V
IN
= 2.0V (Note 7)
6
12.3
40
mA
Circuit Current
R
O
Output Resistance
-2V
V
O
+2V, V
CC
= GND = 0V
300
RECEIVER CHARACTERISTICS (Note 4)
V
TH
Input High Threshold
Voltage
R1R5, SD = 0.8V
1.4
2.4
V
DS14C335
www.national.com
2
Electrical Characteristics
(Notes 2, 3) (Continued)
Over recommended operating conditions, SD = 0.8V, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RECEIVER CHARACTERISTICS (Note 4)
R5, 2.0V
SD
5.5V
2.0
2.8
V
V
TL
Input Low Threshold
Voltage
R1R5, SD = 0.8V
0.4
1.1
V
R5, 2.0V
SD
5.5V
0.1
0.5
V
V
HY
Hysteresis
50
300
mV
R
IN
Input Resistance
V
IN
=
3V to
15V
3.0
3.8
7.0
k
I
IN
Input Current
V
IN
= +15V
2.14
5.0
mA
V
IN
= +3V
0.43
1.0
mA
V
IN
= -3V
-1.0
-0.43
mA
V
IN
= -15V
-5.0
-2.14
mA
V
OH
High Level Output
Voltage
V
IN
= -3V, I
OH
= -1 mA
2.4
3.1
V
V
IN
= -3V, I
OH
= -100 A
2.8
3.28
V
V
OL
Low Level Output
Voltage
V
IN
= +3V, I
OL
= +2 mA
0.23
0.4
V
Switching Characteristics
(Note 2)
Over recommended operating conditions, SD = 0.8V, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
DRIVER CHARACTERISTICS
t
PLH
Propagation Delay LOW to
HIGH
R
L
= 3 k
C
L
= 50 pF
(
Figures 1, 2)
0.1
0.6
1.0
s
t
PHL
Propagation Delay HIGH to
LOW
0.1
0.6
1.0
s
t
SK
Skew |t
PLH
t
PHL
|
0
0.2
s
SR1
Output Slew Rate
R
L
= 3 k
to 7 k
, C
L
= 50 pF (
Figure 2)
4
13
30
V/s
SR2
Output Slew Rate
R
L
= 3 k
, C
L
= 2500 pF (
Figure 2)
4
10
30
V/s
t
PLS
Propagation Delay LOW to SD
(
Figures 5, 6)
R
L
= 3 k
C
L
= 50 pF
0.48
ms
t
PSL
Propagation Delay SD to LOW
1.88
ms
t
PHS
Propagation Delay HIGH to SD
0.62
ms
t
PSH
Propagation Delay SD to HIGH
1.03
ms
RECEIVER CHARACTERISTICS
t
PLH
Propagation Delay LOW to
HIGH
C
L
= 50 pF
(
Figures 3, 3)
0.1
0.4
1.0
s
t
PHL
Propagation Delay HIGH to
LOW
0.1
0.6
1.0
s
t
SK
Skew |t
PLH
t
PHL
|
0.2
0.8
s
t
PLS
Propagation Delay LOW to SD
(
Figures 7, 8)
R
L
= 1 k
C
L
= 50 pF
R1R4 Only
0.13
s
t
PSL
Propagation Delay SD to LOW
1.0
s
t
PHS
Propagation Delay HIGH to SD
0.19
s
t
PSH
Propagation Delay SD to HIGH
0.58
s
Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of "Electrical Characteristics" specify conditions for device operation.
Note 2: Typical values are given for V
CC
= 3.3V and T
A
= +25C.
Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise speci-
fied.
Note 4: Receiver characteristics are guaranteed for SD = 0.8V. When SD = 2.0V, receiver five (R5) is active and meets receiver parameters in SHUTDOWN (SD)
mode, unless otherwise specified.
Note 5: Generator characteristics for driver input: f = 64 kHz (128 kbits/sec), t
r
= t
f
<
10 ns, V
IH
= 3V, V
IL
= 0V, duty cycle = 50%.
Note 6: Generator characteristics for receiver input: f = 64 kHz (128 kbits/sec), t
r
= t
f
= 200 ns, V
IH
= 3V, V
IL
= -3V, duty cycle = 50%.
DS14C335
www.national.com
3
Switching Characteristics
(Note 2) (Continued)
Note 7: Only one driver output shorted at a time.
Parameter Measurement Information
DS011734-3
FIGURE 1. Driver Propagation Delay and Slew Rate Test Circuit
DS011734-4
FIGURE 2. Driver Propagation Delay and Slew Rate Timing
DS011734-5
FIGURE 3. Receiver Propagation Delay Test Circuit
DS011734-6
FIGURE 4. Receiver Propagation Delay Timing
DS011734-7
FIGURE 5. Driver SHUTDOWN (SD) Delay Test Circuit
DS14C335
www.national.com
4
Parameter Measurement Information
(Continued)
Pin Descriptions
V
CC
(Pin 3). Power supply pin for the device, +3.3V (
0.3V).
V+ (Pin 1). Positive supply for TIA/EIA-232-E drivers. Rec-
ommended external capacitor -- 0.47 F (16V). This supply
is not intended to be loaded externally.
V- (Pin 25). Negative supply for TIA/EIA-232-E drivers. Rec-
ommended external capacitor -- 0.47 F (16V). This supply
is not intended to be loaded externally.
C1+, C1- (Pins 6, 24). External capacitor connection pins.
Recommended capacitor -- 0.47 F (6.3V).
C2+, C2- (Pins 2, 4). External capacitor connection pins.
Recommended capacitor -- 0.47 F (16V).
C3+, C3- (Pins 28, 26). External capacitor connection pins.
Recommended capacitor -- 0.47 F (6.3V).
SHUTDOWN (SD) (Pin 23). A High on the SHUTDOWN pin
will lower the total I
CC
current to less than 10 A, providing a
low power state. In this mode receiver R5 remains active.
The SD pin should be driven or tied low (GND) to disable the
shutdown mode.
D
IN
13 (Pins 7, 8, 9). Driver input pins are JEDEC 3.3V
standard compatible.
D
OUT
13 (Pins 22, 21, 20). Driver output pins conform to
TIA/ElA-232 -E levels.
R
IN
15 (Pins 19, 18, 17, 16, 15). Receiver input pins accept
TIA/EIA-232-E input voltages (
25V). Receivers guarantees
hysteresis of TBD mV. Unused receiver input pins may be
left open. Internal input resistor (5 k
) pulls input LOW, pro-
viding a failsafe HIGH output.
R
OUT
15 (Pins 10, 11, 12, 13, 14). Receiver output pins are
JEDEC 3.3V standard compatible.
GND (Pin 27). Ground Pin.
DS011734-8
FIGURE 6. Driver SHUTDOWN (SD) Delay Timing
DS011734-9
FIGURE 7. Receiver SHUTDOWN (SD) Delay Test Circuit
DS011734-10
FIGURE 8. Receiver SHUTDOWN (SD) Delay Timing
DS14C335
www.national.com
5
PDF 
ZIP