MAX3480ACPI datasheet(7/16 Pages) MAXIM

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Complete, Isolated, 3.3V

RS-485/RS-422 Data Interface

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______________________________________________________________Pin Description

Driver Input. With DE

´ high, a low on DI´ forces output A low and output B high. Similarly, a high on DI´

forces output A high and output B low. Drives internal LED cathode through R1 (Table 1 of Figure 2).

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 14.

VCC4

Boosted V+ Voltage Input. Must be connected as shown in Figures 1 and 2.

VCC3

Frequency Switch Input. If FS = VCC, switch frequency is high; if FS = 0V, switch frequency is low

(normal connection).

Boost-Voltage Generator Outputs. See Figures 1 and 2.

D1, D2

Logic-Side Ground Inputs. Must be connected; not internally connected.

GND1,

GND2

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 10, and 14.

VCC2

5, 12

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 2, 10, and 14.

VCC1

3, 4

FUNCTION

NAME

Driver-Enable Input. The driver outputs, A and B, are enabled by bringing DE

´ high. The driver outputs

are high impedance when DE

´ is low. If the driver outputs are enabled, the device functions as a line

driver. While the driver outputs are high impedance, the device functions as a line receiver. Drives

internal LED cathode through R2 (Table 1 of Figure 2).

Receiver Output. If A > B by 200mV, RO will be low; if A < B by 200mV, RO will be high. Open collector;

must have pull-up (R3) to VCC (Table 1 of Figure 2).

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 10.

VCC5

Power-Supply Shutdown Input. Must be connected to logic ground.

PINS ON THE NON-ISOLATED SIDE

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