DS36C279TM NSC [National Semiconductor], DS36C279TM Datasheet - Page 7

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DS36C279TM

Manufacturer Part Number
DS36C279TM
Description
Low Power EIA-RS-485 Transceiver with Sleep Mode
Manufacturer
NSC [National Semiconductor]
Datasheet

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Parameter Measurement Information
Typical Application Information
Unit Load
A unit load for an RS-485 receiver is defined by the input cur-
rent versus the input voltage curve. The gray shaded region
is the defined operating range from −7V to +12V. The top
border extending from −3V at 0 mA to +12V at +1 mA is de-
fined as one unit load. Likewise, the bottom border extending
from +5V at 0 mA to −7V at −0.8 mA is also defined as one
Pin
No.
1
2
3
4
5
6
7
8
DO*/RI*
DO/RI
Name
GND
RE*
V
RO
DE
DI
CC
Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI
DO*/RI* by 200 mV, RO will be HIGH. If DO/RI
RO will be HIGH for OPEN (Non-terminated) Inputs.
Receiver Output Enable: When RE* is LOW the receiver output is enabled. When RE* is HIGH, the
receiver output is in TRI-STATE (OFF). When RE* is HIGH and DE is LOW, the device will enter a
low-current sleep mode after 600 ns.
Driver Output Enable: When DE is HIGH, the driver outputs are enabled. When DE is LOW, the
driver outputs are in TRI-STATE (OFF). When RE* is HIGH and DE is LOW, the device will enter a
low-current sleep mode after 600 ns.
Driver Input: When DE (Driver Enable) is HIGH, the driver is enabled, if DI is LOW, then DO/RI will
be LOW and DO*/RI* will be HIGH. If DI is HIGH, then DO/RI is HIGH and DO*/RI* is LOW.
Ground Connection.
Driver Output/Receiver Input, 485 Bus Pin.
Driver Output/Receiver Input, 485 Bus Pin.
Positive Power Supply Connection: Recommended operating range for V
FIGURE 17. Entering Sleep Mode Conditions
FIGURE 18. Typical RS-485 Bus Interface
TABLE 1. Device Pin Descriptions
(Continued)
7
unit load (see Figure 19 ). An RS-485 driver is capable of
driving up to 32 unit loads. This allows up to 32 nodes on a
single bus. Although sufficient for many applications, it is
sometimes desirable to have even more nodes. For ex-
ample, an aircraft that has 32 rows with 4 seats per row
would benefit from having 128 nodes on one bus. This would
Description
DO*/RI* by 200 mV, RO will be LOW. Additionally
CC
is +4.75V to +5.25V.
DS012053-19
DS012053-18
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