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DS14C535
+5V Supply EIA/TIA-2323x5Driver/Receiver
General Description
The DS14C535 is three driver, five receiver device which
conforms to EIA/TIA-232-E and CCITT (ITU-T) V.28 standard specifications. This device employs an internal DC-DC
converter to generate the necessary output levels from a
+5V power supply. A SHUTDOWN (SD) mode reduces the
supply current to 10 µA maximum. In the SD mode, one receiver is active, allowing ring indicator (RI) to be monitored.
PC Board space consumption isminimizedbythe availability
of Shrink Small Outline Packaging (SSOP).
The DS14C535 provides a one-chipsolution for the common
9-pin serial RS-232 interface between data terminal and
data circuit-terminating equipment.
This device allows an easy migration path to the 3.3V
DS14C335. The packages are the same. The N/C pins on
the DS14C535 are not physically connected to the chip.
Board layout for the DS14C335 will accommodate both devices.
This device’s low power requirement and small footprint
makes it an ideal choice for Laptop and Notebook applications.
Features
n Pin compatible with DS14C335
n Conforms to EIA/TIA-232-E and CCITT (ITU-T) V.28
specifications
n Failsafe receiver outputs high when inputs open
n Operates with single +5V power supply
n Low power requirement — I
CC
12 mA maximum
n SHUTDOWN mode—I
CX
10 µA maximum
n One Receiver (R5) active during SHUTDOWN
n Operates up to 128 kbps—Lap-Link
®
Compatible
n 4V/µs minimum Slew Rate guaranteed
n ESD rating of 3 kV on all pins (H, B, M)
n Available in 28-lead SSOP EIAJ Type II package
n Only four 0.1 µF capacitors required for the DC-DC
converter
Connection Diagram Functional Diagram
Lap-Link®is a registered trademark of Traveling Software Inc.
DS14C535
DS011910-1
Order Number DS14C535MSA
See NS Package Number MSA28
DS011910-2
May 1998
DS14C535 +5V Supply EIA/TIA-2323x5Driver/Receiver
© 1999 National Semiconductor Corporation DS011910 www.national.com
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National SemiconductorSales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.3V to +6V
V
+
Pin (VCC− 0.3V) to +14V
V
−
Pin +0.3V to −14V
Input Voltage (D
IN
, 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 +150˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering 4
sec.) +260˚C
Short Circuit Duration (D
OUT
) Continuous
Maximum Package Power Dissipation
@
+25˚C
SSOP MSAPackage 1286 mW
Derate MSA Package 10.3 mW/˚C above +25˚C
ESD Rating (HBM, 1.5 kΩ, 100
pF) ≥ 3.0 kV
Recommended Operating
Conditions
Min Max Units
Supply Voltage (V
CC
) 4.5 5.5 V
Operating Free Air Temperature (T
A
)
DS14C535 0 +70 ˚C
DC-DC Converter Capacitors (C1–C4)
Recommended range of values is 0.1 µF to 0.68 µF,
±
20%.
For more detail referto application informationsection ofthis
data sheet.
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 +8.5 V
V
−
Negative Power Supply C1–C4=0.1 µF D
IN
=
2.0V −7.0 V
I
CC
Supply Current No Load 12 mA
I
CX
SHUTDOWN Supply Current R
L
=
3kΩ,SD=V
CC
1.0 10 µA
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 ≤ VIN≤ 5.5V +2.0 µA
I
IL
Low Level Enable Current GND ≤ VIN≤ 0.8V −2.0 µA
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 ≤ VIN≤ 5.5V +1.0 µA
I
IL
Low Level Input Current GND ≤ VIN≤ 0.8V −1.0 µA
V
OH
High Level Output Voltage R
L
=
3kΩ +5.0 8 V
V
OL
Low Level Output Voltage −6.7 −5.0 V
I
OS+
Output High Short V
O
=
0V, V
IN
=
0.8V (Note 7) −40 −20 −8 mA
Circuit Current
I
OS−
Output Low Short V
O
=
0V, V
IN
=
2.0V (Note 7) 6 15 40 mA
Circuit Current
R
O
Output Resistance −2V ≤ VO≤ +2V, V
CC
=
GND=0V 300 1200 Ω
RECEIVER CHARACTERISTICS (Note 4)
V
TH
Input High Threshold Voltage R1–R5, SD=0.8V (Active Mode) 1.4 2.4 V
R5, 2.0V ≤ SD ≤ 5.5V (Shutdown Mode) 2.0 2.8 V
V
TL
Input Low Threshold Voltage R1–R5, SD=0.8V (Active Mode) 0.8 1.1 V
R5, 2.0V ≤ SD ≤ 5.5V (Shutdown Mode) 0.8 1.1 V
V
HY
Hysteresis (Note 4) 0.15 1.0 V
R
IN
Input Resistance V
IN
=
±
3V to±15V 3.0 5.4 7.0 kΩ
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
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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)
V
OH
High Level Output Voltage V
IN
=
−3V, I
OH
=
−2.0 mA 3.8 V
V
IN
=
−3V, I
OH
=
−20 µA 4.0 V
V
OL
Low Level Output Voltage V
IN
=
+3V, I
OL
=
+2.0 mA 0.23 0.4 V
Switching Characteristics (Note 4)
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
=
3kΩ 0.1 0.6 1.0 µs
t
PHL
Propagation Delay HIGH to LOW C
L
=
50 pF 0.1 0.6 1.0 µs
t
SK
Skew |t
PLH–tPHL
|(
Figures 1, 2
) 0 0.2 µs
SR1 Output Slew Rate R
L
=
3kΩto7kΩ,C
L
=
50 pF (
Figure 2
) 4 13 30 V/µs
SR2 Output Slew Rate R
L
=
3kΩ,C
L
=
2500 pF (
Figure 2
) 4 10 30 V/µs
t
PLS
Propagation Delay LOW to SD (
Figures 5, 6
) 0.48 ms
t
PSL
Propagation Delay SD to LOW R
L
=
3kΩ 1.88 ms
t
PHS
Propagation Delay HIGH to SD C
L
=
50 pF 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 0.1 0.4 1.0 µs
t
PHL
Propagation Delay HIGH to LOW (
Figures 3, 4
) 0.1 0.6 1.0 µs
t
SK
Skew |t
PLH–tPHL
| 0.1 0.5 µs
t
PLS
Propagation Delay LOW to SD (
Figures 7, 8
) 0.13 µs
t
PSL
Propagation Delay SD to LOW R
L
=
1kΩ 1.0 µs
t
PHS
Propagation Delay HIGH to SD C
L
=
50 pF 0.19 µs
t
PSH
Propagation Delay SD to HIGH R1–R4 Only 0.58 µs
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
=
5V and T
A
=
+25˚C.
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 specified. For voltage logic levels, the more positive value is designated as maximum. For example, if −5V is a maximum, the typical value (−6.7V) is more negative.
Note 4: Receiver characteristics are guaranteed for SD=0.8V. When SD=2.0V, receiver five (R5) is activeand meets receiverparameters 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
<
10 ns, V
IH
=
3V, V
IL
=
−3V, duty cycle=50%.
Note 7: Only one driver output shorted at a time.
Parameter Measurement Information
DS011910-3
FIGURE 1. Driver Propagation Delay and Slew Rate Test Circuit
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Parameter Measurement Information (Continued)
DS011910-4
FIGURE 2. Driver Propagation Delay and Slew Rate Timing
DS011910-5
FIGURE 3. Receiver Propagation Delay Test Circuit
DS011910-6
FIGURE 4. Receiver Propagation Delay Timing
DS011910-7
FIGURE 5. Driver SHUTDOWN (SD) Delay Test Circuit
DS011910-8
FIGURE 6. Driver SHUTDOWN (SD) Delay Timing
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Parameter Measurement Information (Continued)
Pin Descriptions
VCC(Pin 3). Power supply pin for the device, +5V (±0.5V).
V+ (Pin 1). Positive supply for EIA/TIA-232-E drivers. Rec-
ommended external capacitor — 0.1 µF (16V).This supply is
not intended to be loaded externally.
V− (Pin 25). Negative supply forEIA/TIA-232-E drivers. Recommended external capacitor — 0.1 µF (16V).This supply is
not intended to be loaded externally.
C1+, C1− (Pins 2, 4). External capacitor connection pins.
C2+, C2− (Pins 28, 26). External capacitor connection pins.
SHUTDOWN (SD) (Pin 23). AHigh on the SHUTDOWN pin
will lower thetotal I
CC
current to lessthan 10 µA, providing a
low power state. In this mode receiver R5 remains active.
The SD pin shouldbe drivenor tied low (GND)to disablethe
shutdown mode.
D
IN
1–3 (Pins 7, 8, 9). Driver input pins.
D
OUT
1–3 (Pins 22, 21, 20). Driver output pins conform to
EIA/TlA-232 -E levels.
R
IN
1–5 (Pins19, 18,17, 16, 15).Receiver inputpins accept
EIA/TIA-232-E input voltages(
±
25V). Receivers guarantees
hysteresis of TBD mV. Unused receiver input pins may be
left open. Internal input resistor (5 kΩ) pulls input LOW, providing a failsafe HIGH output.
R
OUT
1–5 (Pins 10, 11, 12, 13, 14). Receiver output pins.
GND (Pins 5, 27). Ground Pins. Both pins must be con-
nected to external ground. These pins are not connected together on the chip.
Application Information
In a typical Data Terminal Equipment (DTE) to Data
Circuit-Terminating Equipment (DCE) 9-pin de-facto interface implementation, 2 data lines and 6 control lines are required. The data lines are TXD and RXD and the control
lines are RTS, DTR, DSR, DCD, CTS and RI. The
DS14C535 is a 3 x 5 Driver/Receiver and offersa single chip
solution for the DTE interface as shown in
Figure 9
.
Ring Indicator (RI) is used to inform the DTE that an incoming call is coming froma remote DCE. When the DS14C535
is in SHUTDOWN (SD) mode, receiver five(R5) remainsactive and monitors RI circuit. This active receiver (R5) alerts
the DTE to switch the DS14C535 from SHUTDOWN to active mode.
To achieve minimum power consumption, the DS14C535
can be in SHUTDOWN modeand only activated when communications are needed.
DS011910-9
FIGURE 7. Receiver SHUTDOWN (SD) Delay Test Circuit
DS011910-10
FIGURE 8. Receiver SHUTDOWN (SD) Delay Timing
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Application Information (Continued)
DS011910-11
FIGURE 9. Typical DTE Application
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Application Information (Continued)
Capacitors:
Capacitors can be ceramic or tantalum. Standard surface
mount in the range of 0.1 µF to 0.68 µF are readily available
from several manufacturers. A minimum 20V rating isrecommended. Contact manufacturers for specific detail on surface mounting and dielectrics. Apartial list of manufacturers
include:
Manufacturer Phone Number
KEMET 803-963-6300
AVX 803-448-9411
MURATA-ERIE 800-831-9172
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Physical Dimensions inches (millimeters) unless otherwise noted
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
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Email: support@nsc.com
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Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
Order Number DS14C535MSA
NS Package Number MSA28
DS14C535 +5V Supply EIA/TIA-2323x5Driver/Receiver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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