DS8935WM National Semiconductor, DS8935WM Datasheet - Page 8

• Manufacturer Part Number: DS8935WM
• Description: IC LOCAL TALK W/TRI-STATE SO20
• Manufacturer: National Semiconductor
• Type: Transceiverr

Specifications of DS8935WM

• Number Of Drivers/receivers: 2/3
• Protocol: RS422, RS423
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DS8935WM

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Typical Application Information
DRIVER OUTPUT WAVEFORMS
The driver configuration on the DS8935 is unique among
TIA/EIA-422 devices in that it utilizes −5V V
cal TIA/EIA-422 driver uses +5V only and generates signal
swings of approximately 0V–5V.
By utilizing V
much larger differential signal. The typical output voltage is
about |4| V, which gives |8| V differentially, thus providing a
Note 9: V
Note 10: D1 Enabled (Active)
CC
= +5V, V
EE
5, 6, 7
17, 18
13, 15
16, 14
10, 11
Pin #
2, 4
, the differential driver is able to generate a
19
12
20
3
9
8
1
EE
= −5V
D
D
D
D
R
R
R
R
R
N/C
GND
V
V
EE
CC
Name
IN
EN1
OUT
OUT
IN
IN
OUT
EN
EN
+
−
+
−
TTL Driver Input Pins
Active Low Driver Enable Pin. A High on this Pin TRI-STATEs the Driver
Outputs (D1 Only)
Non-Inverting Driver Output Pin
Inverting Driver Output Pin
Non-Inverting Receiver Input Pin
Inverting Receiver Input Pin
Receiver Output Pin
Active Low Receiver Enable
Active High Receiver Enable
Not Connected
Ground Pin
Negative Power Supply Pin, −5V
Positive Power Supply Pin, +5V
FIGURE 13. Typical Driver Output Waveforms
EE
TABLE 1. Device Pin Descriptions
supply. A typi-
DS012066-15
(Continued)
8
much greater noise margin than +5V drivers. See Figure 13 .
The receiver therefore has a range of +8V to −8V or V
16V (V
Each side of the differential driver operates similar to a TIA/
EIA-423 driver. The output voltages are slightly different due
to the loading: the differential driver has differential termina-
tion, the single-ended driver is terminated with a resistor to
ground.
Description
±
±
5%
5%
SS
= V
OD
–V
OD
*
).
DS012066-16
SS
of