Rainbow-electronics MAX3430 Manual do Utilizador descarregar pdf (Página 8)

MAX3430

±80V Fault-Protected, Fail-Safe,

1/4-Unit Load, +3.3V RS-485 Transceiver

8 _______________________________________________________________________________________

Pin Description

PIN NAME FUNCTION

1 RO Receiver Output

2 RE

Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. The

device enters a low-power shutdown mode if RE is high and DE is low.

3DE

Driver Output Enable. Driving DE high enables the driver outputs. Pulling DE low puts the driver

outputs in a high-impedance state. If RE is high and DE is low, the device enters a low-power

shutdown mode. If the driver outputs are enabled, the device functions as a line driver, and when

they are high impedance it functions as a line receiver if RE is low.

4DI

Driver Input. A logic low on DI forces output A low and output B high, while a logic high on DI forces

output A high and output B low.

5 GND Ground

6 A Noninverting Receiver Input/Driver Output

7 B Inverting Receiver Input/Driver Output

Positive Supply, V

= +3.3V ±10%. Bypass V

to GND with a 0.1µF ceramic capacitor.

Function Tables

Table 1. Transmitting

INPUTS OUTPUTS

RE DE DI B A

MODE

X 1 1 0 1 Normal

X 1 0 1 0 Normal

0 0 X High-Z High-Z Normal

1 0 X High-Z High-Z Shutdown

Table 2. Receiving

INPUTS OUTPUTS

RE DE (A - B) RO

MODE

00≥ -50mV 1 Normal

00≤ -200mV 0 Normal

Inputs

open

1 Normal

1 0 X High-Z Shutdown

X = Don’t care.

1 2 3 4 5 6 7 8 9 10 11 12 13

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