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DS14C232 Schematic ( PDF Datasheet ) - National

Teilenummer DS14C232
Beschreibung Low Power +5V Powered TIA/EIA-232 Dual
Hersteller National
Logo National Logo 




Gesamt 12 Seiten
DS14C232 Datasheet, Funktion
October 1999
DS14C232
Low Power +5V Powered TIA/EIA-232 Dual
Driver/Receiver
General Description
The DS14C232 is a low power dual driver/receiver featuring
an onboard DC to DC converter, eliminating the need for
±12V power supplies. The device only requires a +5V power
supply. ICC is specified at 3.0 mA maximum, making the de-
vice ideal for battery and power conscious applications. The
drivers’ slew rate is set internally and the receivers feature
internal noise filtering, eliminating the need for external slew
rate and filter capacitors. The device is designed to interface
data terminal equipment (DTE) with data circuit-terminating
equipment (DCE). The driver inputs and receiver outputs are
TTL and CMOS compatible. DS14C232C driver outputs and
receiver inputs meet TIA/EIA-232-E (RS-232) and CCITT
V.28 standards.
Features
n Pin compatible with industry standard MAX232, LT1081,
ICL232 and TSC232
n Single +5V power supply
n Low power — ICC 3.0 mA maximum
n DS14C232C meets TIA/EIA-232-E (RS-232) and CCITT
V.28 standards
n CMOS technology
n Receiver Noise Filter
n Package efficiency — 2 drivers and 2 receivers
n Available in Plastic DIP, Narrow and Wide SOIC
packages
n TIA/EIA-232 compatible extended temperature range
option:
DS14C232T −40˚C to +85˚C
DS14C232E/J: −55˚C to +125˚C
Connection Diagram
Functional Diagram
DS010744-1
Order Number DS14C232CN, DS14C232CM, or
DS14C232TM
See NS Package Number N16E, or M16A
© 1999 National Semiconductor Corporation DS010744
DS010744-2
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DS14C232 Datasheet, Funktion
Parameter Measurement Information (Continued)
DS010744-5
FIGURE 3. Receiver Load Circuit
FIGURE 4. Receiver Propagation Delays and Noise Rejection (Note 4)
DS010744-6
Pin Descriptions
VCC (Pin 16)
Power supply pin for the device, +5V (±10%).
V+ (Pin 2)
Positive supply for TIA/EIA-232-E drivers. Recommended
external capacitor: C4-1.0 µF (6.3V). Capacitor value should
be larger than 1 µF. This supply is not intended to be loaded
externally.
V− (Pin 6)
Negative supply for TIA/EIA-232-E drivers. Recommended
external capacitor: C3-1.0 µF (16V). Capacitor value should
be larger than 1 µF. This supply is not intended to be loaded
externally.
C1+, C1− (Pins 1, 3)
External capacitor connection pins. Recommended capaci-
tor: 1.0 µF (6.3V). Capacitor value should be larger than
1 µF.
C2+, C2− (Pins 4, 5)
External capacitor connection pins. Recommended capaci-
tor: 1.0 µF (16V). Capacitor value should be greater than
1 µF.
DIN1, DIN2 (Pins 11, 10)
Driver input pins are TTL/CMOS compatible. Inputs of un-
used drivers may be left open, an internal active pull-up re-
sistor (500 kminimum, typically 5 M) pulls input HIGH.
Output will be LOW for open inputs.
DOUT1, DOUT2 (Pins 14, 7)
Driver output pins conform to TIA/EIA-232-E levels.
RIN1, RIN2 (Pins 13, 8)
Receiver input pins accept TIA/EIA-232-E input voltages
(±25V). Receivers feature a noise filter and guaranteed hys-
teresis of 100 mV. Unused receiver input pins may be left
open. Internal input resistor 4.7 kpulls input low, providing
a failsafe high output.
ROUT1, ROUT2 (Pins 12, 9)
Receiver output pins are TTL/CMOS compatible. Receiver
output HIGH voltage is specified for both CMOS and TTL
load conditions.
GND (Pin 15)
Ground Pin.
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DS14C232 pdf, datenblatt
Notes
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
Fax: 1-800-737-7018
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
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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