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PDF DS14C535 Data sheet ( Hoja de datos )
| Número de pieza | DS14C535 | |
| Descripción | +5V Supply EIA/TIA-232 3 x 5 Driver/Receiver | |
| Fabricantes | National | |
| Logotipo |  |
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May 1998
DS14C535
+5V Supply EIA/TIA-232 3 x 5 Driver/Receiver
General Description
The DS14C535 is three driver, five receiver device which
conforms to EIA/TIA-232-E and CCITT (ITU-T) V.28 stan-
dard 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 re-
ceiver is active, allowing ring indicator (RI) to be monitored.
PC Board space consumption is minimized by the availability
of Shrink Small Outline Packaging (SSOP).
The DS14C535 provides a one-chip solution 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 de-
vices.
This device’s low power requirement and small footprint
makes it an ideal choice for Laptop and Notebook applica-
tions.
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 — ICC 12 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 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
DS14C535
Functional Diagram
DS011910-1
Order Number DS14C535MSA
See NS Package Number MSA28
Lap-Link® is a registered trademark of Traveling Software Inc.
© 1999 National Semiconductor Corporation DS011910
DS011910-2
www.national.com
1 page  
Parameter Measurement Information (Continued)
DS011910-9
FIGURE 7. Receiver SHUTDOWN (SD) Delay Test Circuit
DS011910-10
FIGURE 8. Receiver SHUTDOWN (SD) Delay Timing
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 for EIA/TIA-232-E drivers. Rec-
ommended 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). 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.
DOUT 1–3 (Pins 22, 21, 20). Driver output pins conform to
EIA/TlA-232 -E levels.
RIN 1–5 (Pins 19, 18, 17, 16, 15). Receiver input pins 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, pro-
viding a failsafe HIGH output.
ROUT 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 to-
gether on the chip.
Application Information
In a typical Data Terminal Equipment (DTE) to Data
Circuit-Terminating Equipment (DCE) 9-pin de-facto inter-
face implementation, 2 data lines and 6 control lines are re-
quired. 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 offers a single chip
solution for the DTE interface as shown in Figure 9 .
Ring Indicator (RI) is used to inform the DTE that an incom-
ing call is coming from a remote DCE. When the DS14C535
is in SHUTDOWN (SD) mode, receiver five (R5) remains ac-
tive and monitors RI circuit. This active receiver (R5) alerts
the DTE to switch the DS14C535 from SHUTDOWN to ac-
tive mode.
To achieve minimum power consumption, the DS14C535
can be in SHUTDOWN mode and only activated when com-
munications are needed.
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS14C535.PDF ] | |
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