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PDF DS14C241 Data sheet ( Hoja de datos )
| Número de pieza | DS14C241 | |
| Descripción | Single Supply TIA/EIA-232 4 x 5 Driver/Receiver | |
| Fabricantes | National | |
| Logotipo |  |
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May 1998
DS14C241
Single Supply TIA/EIA-232 4 x 5 Driver/Receiver
General Description
The DS14C241 is four driver, five receiver device which con-
forms to the TIA/EIA-232-E standard and CCITT V.28 recom-
mendations. This device eliminates ±12V supplies by em-
ploying an internal DC–DC converter to generate the
necessary output levels from a single +5V supply. Driver
slew rate control and receiver noise filtering have also been
internalized to eliminate the need for external slew rate con-
trol and noise filtering capacitors. With the addition of TRI-
STATE®receiver outputs and a shutdown mode, device
power consumption is kept to a minimum.
Features
n Conforms to TIA/EIA-232-E and CCITT V.28
n Internal DC–DC converter
n Operates with single +5V supply
n Low power requirement — ICC 10 mA max
n Shutdown mode — ICX 10 µA max
n Internal driver slew rate control
n Receiver noise filtering
n Operates above 120 kbits/sec
n TRI-STATE receiver outputs
n Direct replacement for MAX241
Connection Diagram
Functional Diagram
DS011281-1
Order Number DS14C241WM
See NS Package Number M28B
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS011281
DS011281-2
www.national.com
1 page  
Parameter Measurement Information (Continued)
DS011281-10
FIGURE 7. Receiver TRI-STATE Timing (tPLZ, tPZL)
Pin Descriptions
VCC (pin 11) — Power supply pin for the device,
+5V (±10%).
V+ (pin 13) — Positive supply for TIA/EIA-232-E drivers.
Recommended external capacitor: C4 = 1.0 µF (6.3V). This
supply is not intended to be loaded externally.
V− (pin 17) — Negative supply for TIA/EIA-232-E drivers.
Recommended external capacitor: C3 = 1.0 µF (16V). This
supply is not intended to be loaded externally.
C1+, C1− (pins 12 and 14) — External capacitor connection
pins. Recommended capacitor — 1.0 µF (6.3V).
C2+, C2− (pins 15 and 16) — External capacitor connection
pins. Recommended capacitor — 1.0 µF (16V).
EN (pin 24) — Controls the Receiver output TRI-STATE Cir-
cuit. A HIGH level on this pin will disable the Receiver Out-
put.
DIN 1–4 (pins 7, 6, 20 and 21) — Driver input pins are TTL/
CMOS compatible. Inputs of unused drivers may be left
open, an internal pull-up resistor (500 kΩ minimum, typically
5 MΩ) pulls input to VCC. Output will be LOW for open inputs.
DOUT 1–4 (pins 2, 3, 1 and 28) — Driver output pins con-
form to TIA/EIA-232-E levels.
RIN 1–5 (pins 9, 4, 27, 23 and 18) — Receiver input pins ac-
cept TIA/EIA-232-E input voltages (±15V). Receivers fea-
ture a noise filter and guaranteed hysteresis of 200 mV. Un-
used receiver input pins may be left open. Internal input
resistor (5 kΩ) pulls input LOW, providing a failsafe HIGH
output.
ROUT 1–5 (pins 8, 5, 26, 22 and 19) — Receiver output pins
are TTL/CMOS compatible. Receiver output HIGH voltage is
specified for both CMOS and TTL load conditions.
GND (pin 10) — Ground pin.
SHUTDOWN (SD) (pin 25) — A High on the SHUTDOWN
pin will lower the total ICC current to less than 10 µA. Provid-
ing a low power state.
Typical Performance Characteristics
Slew Rate vs Cap. Load vs VCC
(Four Drivers)
Slew Rate vs Temperature vs
Cap. Load (Four Drivers Switching)
DS011281-11
5
DS011281-12
www.national.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS14C241.PDF ] | |
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