DS36C280TM National Semiconductor, DS36C280TM Datasheet - Page 8

• Manufacturer Part Number: DS36C280TM
• Description: BUS TRANSCEIVER RS485, SMD, 36C280
• Manufacturer: National Semiconductor

Specifications of DS36C280TM

• Supply Voltage Range: 4.75V To 5.25V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Operating Temperature Max: 85°C
• Operating: RoHS Compliant
• Base Number: 36
• Ic Generic Number: 36C280
• Rohs Compliant: Yes

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Unit Load
Slew Rate Control
The DS36C280 features an adjustable slew rate control.
This feature allows more control over EMl levels than tradi-
FIGURE 18. Input Current vs Input Voltage
(Continued)
Operating Range
FIGURE 19. Slew Rate Resistor
Differential Rise/Fall Time
01205219
vs Slew Rate Resistor
vs Rise/Fall Time
8
tion fixed edge rate devices. The slew rate control may be
adjusted with or without any external components. The
DS36C280 offers both low power (I
EMI for an RS-485 interface.
The slew rate control is located at pin two of the device and
only controls the driver output edges. The slew rate control
pin (SR) may be left open or shorted to ground, with or
without a resistor. When the SR pin is shorted to ground
without a resistor, the driver output edges will transition
typically 350 ns. When the SR pin is left open, the driver
output edges will transition typically 3 µs. When the SR pin is
shorted to ground with a resistor, the driver output edges will
transition between 350 ns and 3 µs depending on the resis-
tor value. Refer to the slew rate versus resistor value curve
in this datasheet for determining resistor values and ex-
pected typical slew rate value. Please note, when slowing
the edge rates of the device (see Figure 19 ) will decrease
the maximum data rate also.
01205220
CC
500 µA max) and low