Datasheet

DS485
www.ti.com SNLS122C –JULY 1998–REVISED APRIL 2013
Figure 14.
PIN DESCRIPTIONS
Pin # I/O Name Function
1 O RO Receiver Output: If A > B by 200 mV, RO will be high; If A < B by 200 mV, RO will be low. RO will be high also if
the inputs (A and B) are open (non-terminated).
2 I RE* Receiver Output Enable: RO is enabled when RE* is low; RO is in TRI-STATE when RE* is high.
3 I DE 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).
4 I DI 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.
5 NA GND Ground
6 I/O A Non-inverting Driver Output and Receiver Input pin. Driver output levels conform to RS-485 signaling levels.
7 I/O B Inverting Driver Output and Receiver Input pin. Driver output levels conform to RS-485 signaling levels.
8 NA V
CC
Power Supply: 4.75V ≤ V
CC
≤ 5.25V
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Part Number Temperature Range Number of XCVRs on Bus Comments
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DS36C279 0°C to +70°C 128 Auto-Sleep Mode
DS36C279T −40°C to +85°C 64 Auto-Sleep Mode
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DS36C280T −40°C to +85°C 64 Adjustable Slew Rate Control
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