MAX1480ACPI datasheet(5/21 Pages) MAXIM

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Complete, Isolated RS-485/RS-422

Data Interface

_______________________________________________________________________________________

Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to logic-

side ground (GND_), unless otherwise specified.

Note 2: For DE´ and DI´ pin descriptions, see Detailed Block Diagram and Typical Application Circuit (Figure 1 for MAX1480A/

MAX1480B/MAX1480C, Figure 2 for MAX1490A/MAX1490B).

Note 3: Shutdown supply current is the current at VCC1 and VCC2 when shutdown is enabled.

Note 4: Applies to peak current (see Typical Operating Characteristics). Although the MAX1480A/B/C and MAX1490A/B provide

electrical isolation between logic ground and signal paths, they do not provide isolation between external shields and the

signal paths (see Isolated Common Connection section).

SWITCHING CHARACTERISTICS—MAX1480B/MAX1480C/MAX1490B (continued)

(VCC_ = 5V ±10%, FS = VCC_, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC_ = 5V and TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Driver Disable Time from Low

(MAX1480C Only)

tLZ

Figures 6 and 8, CL = 15pF, S1 closed

2.0

4.5

µs

Driver Disable Time from High

(MAX1480C Only)

tHZ

Figures 6 and 8, CL = 15pF, S2 closed

2.0

4.5

µs

tPLH

3.0

Receiver Input to Output

Propagation Delay

tPHL

Figures 5 and 10, RDIFF = 54

Ω,

CL1 = CL2 = 100pF

3.0

µs

|tPLH - tPHL| Differential Receiver

Skew

tSKD

Figures 5 and 10, RDIFF = 54

Ω,

CL1 = CL2 = 100pF

1200

Maximum Data Rate

fMAX

tPLH, tPHL < 50% of data period

0.25

Mbps

Time to Shutdown

tSHDN

100

µs

Shutdown to Driver Output High

tZH(SHDN)

Figures 6 and 9, CL = 100pF, S2 closed

100

µs

Shutdown to Driver Output Low

tZL(SHDN)

Figures 6 and 9, CL = 100pF, S1 closed

100

µs

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