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PDF DS14C335 Data sheet ( Hoja de datos )

Número de pieza DS14C335
Descripción +3.3V Supply TIA/EIA-232 3 x 5 Driver/Receiver
Fabricantes National 
Logotipo National Logotipo



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No Preview Available ! DS14C335 Hoja de datos, Descripción, Manual

March 2000
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 µA 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 — ICC 20 mA maximum
n SHUTDOWN mode — ICX 10 µA maximum
n One Receiver (R5) active during SHUTDOWN
n Operates up to 128 kbps — Lap-Link® Compatible
n Flow through pinout
n 4V/µs minimum Slew Rate guaranteed
n Inter-operates with +5V UARTs
n Available in 28-lead SSOP EIAJ Type II package
Connection Diagram
DS14C335
Functional Diagram
DS011734-1
Order Number DS14C335MSA
See NS Package Number MSA28
Lap-Link® is a registered trademark of Traveling Software.
© 2000 National Semiconductor Corporation DS011734
DS011734-2
www.national.com

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DS14C335 pdf
Parameter Measurement Information (Continued)
DS011734-8
FIGURE 6. Driver SHUTDOWN (SD) Delay Timing
DS011734-9
FIGURE 7. Receiver SHUTDOWN (SD) Delay Test Circuit
FIGURE 8. Receiver SHUTDOWN (SD) Delay Timing
DS011734-10
Pin Descriptions
VCC (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 µF (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 µF (16V). This supply
is not intended to be loaded externally.
C1+, C1− (Pins 6, 24). External capacitor connection pins.
Recommended capacitor — 0.47 µF (6.3V).
C2+, C2− (Pins 2, 4). External capacitor connection pins.
Recommended capacitor — 0.47 µF (16V).
C3+, C3− (Pins 28, 26). External capacitor connection pins.
Recommended capacitor — 0.47 µF (6.3V).
SHUTDOWN (SD) (Pin 23). A High on the SHUTDOWN pin
will lower the total ICC current to less than 10 µA, 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.
DIN 1–3 (Pins 7, 8, 9). Driver input pins are JEDEC 3.3V
standard compatible.
DOUT 1–3 (Pins 22, 21, 20). Driver output pins conform to
TIA/ElA-232 -E levels.
RIN 1–5 (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.
ROUT 1–5 (Pins 10, 11, 12, 13, 14). Receiver output pins are
JEDEC 3.3V standard compatible.
GND (Pin 27). Ground Pin.
5 www.national.com

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