DS14185WM/NOPB National Semiconductor, DS14185WM/NOPB Datasheet - Page 5

• Manufacturer Part Number: DS14185WM/NOPB
• Description: IC DVR/RCVR EIA/TIA-232 20-SOIC
• Manufacturer: National Semiconductor
• Type: Transceiverr

Specifications of DS14185WM/NOPB

• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *DS14185WM/NOPB

Pin Descriptions
Applications Information
In a typical Data Terminal Equipment (DTE) to Data Circuit-
Terminating Equipment (DCE) 9-pin de-facto interface imple-
mentation, 2 data lines and 6 control lines are required. 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.
LapLink COMPATIBILITY
The DS14185 can easily provide 128 kbps data rate under
maximum driver load conditions of C
kΩ, while power supplies are:
12, 14, 17, 18, 19
2, 3, 4, 7, 9
13, 15, 16
5, 6, 8
Pin #
11
10
20
1
L
= 2500 pF and R
D
D
R
R
GND
V
V
V
IN
OUT
IN
OUT
+
−
CC
FIGURE 5. Typical DTE Application
Name
01193807
L
Driver Input Pins
Driver Output Pins, RS-232 Levels
Receiver Input Pins, RS-232 Levels
Receiver Output Pins
Ground
Positive Power Supply Pin (+9.0 ≤ V
Negative Power Supply Pin (−9.0 ≤ V
Positive Power Supply Pin (+5V
= 3
5
MOUSE DRIVING
A typical mouse can be powered from the drivers. Two driver
outputs connected in parallel and set to V
supply power to the V
output is set to V
Refer to typical curves of V
cations are:
V
Description
CC
= 4.75V, V
OL
to sink the current from the V
±
+
10 mA at +6V
5 mA at −6V
5%)
pin of the mouse. The third driver
+
+
−
≤ +13.2)
= 10.8V, V
OUT
≤ −13.2)
/I
OUT
.Typical mouse specifi-
−
= −10.8V
OH
can be used to
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−
terminal.