ds485tn National Semiconductor Corporation, ds485tn Datasheet - Page 6

• Manufacturer Part Number: ds485tn
• Description: Low Power Rs-485/rs-422 Multipoint Transceiver
• Manufacturer: National Semiconductor Corporation

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DS36C278
DS36C278T
DS36C279
DS36C279T
DS36C280
DS36C280T
Pin #
Parameter Measurement Information
Pin Descriptions
Related National Low Power
RS-485 Transceivers
1
2
3
4
5
6
7
8
Part Number
NA
NA
I/O
I/O
I/O
O
I
I
I
Name
GND
RE*
V
RO
DE
DI
A
B
CC
Receiver Output: If A
be high also if the inputs (A and B) are open (non-terminated).
Receiver Output Enable: RO is enabled when RE* is low; RO is in TRI-STATE when RE* is high.
Driver Output Enable: The driver outputs (A and B) are enabled when DE is high; they are in
TRI-STATE when DE is low. Pins A and B also function as the receiver input pins (see below).
Driver Input: A low on DI forces A low and B high while a high on DI forces A high and B low when
the driver is enabled.
Ground
Non-inverting Driver Output and Receiver Input pin. Driver output levels conform to RS-485 signaling
levels.
Inverting Driver Output and Receiver Input pin. Driver output levels conform to RS-485 signaling
levels.
Power Supply: 4.75V ≤ V
−40˚C to +85˚C
−40˚C to +85˚C
−40˚C to +85˚C
Temperature
0˚C to +70˚C
0˚C to +70˚C
0˚C to +70˚C
Range
>
B by 200 mV, RO will be high; If A
CC
≤ 5.25V
FIGURE 13.
XCVRs on Bus
6
Number of
(Continued)
128
128
128
64
64
64
Function
Ultra Low Power Transceiver
Ultra Low Power Transceiver
Auto-Sleep Mode
Auto-Sleep Mode
Adjustable Slew Rate Control
Adjustable Slew Rate Control
<
B by 200 mV, RO will be low. RO will
01288014
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