MAX14780E_1110 Datasheet, PDF (9/14 Pages) Maxim Integrated Products – 5.0V, 30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver

+5.0V, ±30kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
Pin Configuration
+
RO _{1 R}
RE 2
DE 3
DI 4 D
8 VCC
7B
6A
5 GND
SO/PDIP
Pin Description
PIN
NAME
FUNCTION
1
RO
Receiver Output. When RE is low and if (A - B) R -50mV, RO is high; if (A - B) P -200mV, RO is low.
Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive
2
RE
RE high and DE low to enter low-power shutdown mode. RE is a hot-swap input (see the Hot-Swap
Capability section for details).
Driver Output Enable. Drive DE high to enable driver outputs. These outputs are high impedance
3
DE
when DE is low. Drive RE high and DE low to enter low-power shutdown mode. DE is a hot-swap
input (see the Hot-Swap Capability section for details).
4
DI
Driver Input. With DE high, a low on DI forces noninverting output low and inverting output high.
Similarly, a high on DI forces noninverting output high and inverting output low.
5
GND
Ground
6
A
Noninverting Receiver Input and Noninverting Driver Output
7
B
Inverting Receiver Input and Inverting Driver Output
8
VCC
Positive Supply VCC = +5.0V Q10%. Bypass VCC to GND with a 0.1FF capacitor.
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
B
A
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z High-Z
1
0
X
Shutdown
Function Tables
RECEIVING
INPUTS
OUTPUTS
RE
DE
A-B
RO
0
X
R -50mV
1
0
X
P -200mV
0
0
X
Open/shorted
1
1
1
X
High-Z
1
0
X
Shutdown
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