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PDF DS14185 Data sheet ( Hoja de datos )
| Número de pieza | DS14185 | |
| Descripción | EIA/TIA-232 3 Driver x 5 Receiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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April 1999
DS14185
EIA/TIA-232 3 Driver x 5 Receiver
General Description
The DS14185 is a three driver, five receiver device which
conforms to the EIA/TIA-232-E standard.
The flow-through pinout facilitates simple non-crossover
board layout. The DS14185 provides a one-chip solution for
the common 9-pin serial RS-232 interface between data ter-
minal and data communications equipment.
Features
n Replaces one 1488 and two 1489s
n Conforms to EIA/TIA-232-E
n 3 drivers and 5 receivers
n Flow through pinout
n Failsafe receiver outputs
n 20-pin SOIC package
n LapLink® compatible −200 kbps data rate
www.DataSheet4U.comConnection Diagram
SOIC
Functional Diagram
DS011938-1
Order Number DS14185WM
See NS Package M20B
DS011938-2
LapLink® is a registered trademark of Travelling Software.
© 1999 National Semiconductor Corporation DS011938
www.national.com
1 page  
Pin Descriptions (Continued)
Pin #
10
20
Name
V−
VCC
Description
Negative Power Supply Pin (−9.0 ≤ V− ≤ −13.2)
Positive Power Supply Pin (+5V ±5%)
Applications 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. The control lines
are RTS, DTR, DSR, DCD, CTS, and RI.
The DS14185 is a 3 x 5 Driver/Receiver and offers a single
chip solutuion for this DTE interface. As shown in Figure 5,
this interface allows for direct flow-thru interconnect. For a
more conservative design, the user may wish to insert
ground traces between the signal lines to minimize cross
talk.
www.DataSheet4U.com
LapLink COMPATIBILITY
The DS14185 can easily provide 128 kbps data rate under
maximum driver load conditions of CL = 2500 pF and RL = 3
kΩ, while power supplies are:
VCC = 4.75V, V+ = 10.8V, V− = −10.8V
MOUSE DRIVING
A typical mouse can be powered from the drivers. Two driver
outputs connected in parallel and set to VOH can be used to
supply power to the V+ pin of the mouse. The third driver out-
put is set to VOL to sink the current from the V− terminal. Re-
fer to typical curves of VOUT/IOUT.Typical mouse specifica-
tions are:
10 mA at +6V
5 mA at −6V
FIGURE 5. Typical DTE Application
DS011938-7
5 www.national.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS14185.PDF ] | |
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