SP3490 datasheet(3/11 Pages) SIPEX

3 / 11 page

Rev. 10/11/02

SP3490/3491 Low Power Full-Duplex RS485 Transceivers

SPECIFICATIONS (continued)

AMB = TMIN to TMAX and VCC = 3.3V ± 5% unless otherwise noted.

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP3490 RECEIVER

AC Characteristics

Maximum Data Rate

Mbps

Receiver Input to Output, t

PLH

120

Figures 6 and 11

AMB = 25

oC, V

CC = 3.3V, Figures 6 and 11

Receiver Input to Output, t

PHL

120

Figures 6 and 11

AMB = 25

oC, V

CC = 3.3V, Figures 6 and 11

Differential Receiver Skew

PHL(A) - tPLH(A) , tPHL(B) - tPLH(B) ,

Figures 6 and 11

POWER REQUIREMENTS

Supply Voltage

+3.0

+3.6

Volts

Supply Current

1000

2000

µA

DE = V

800

1500

DE = 0

Figure 4. Driver Enable and Disable Timing Circuit,

Output HIGH

Figure 5. Driver Enable and Disable Timing Circuit,

Output LOW

Figure 1. Driver DC Test Load Circuit

Figure 2. Driver Propagation Delay Test Circuit

GENERATOR

(NOTE 1)

50Ω

VCC

VDM

RL = 27Ω

OUT

CL = 15pF

(NOTE 2)

VOM =

1.5V

VOH + VOL

GENERATOR

(NOTE 1)

50Ω

RL = 110Ω

OUT

CL = 50pF

(NOTE 2)

VOM =

1.5V

VOH + VOL

GENERATOR

(NOTE 1)

50Ω

RL = 110Ω

OUT

CL = 50pF

(NOTE 2)

0V OR 3V

VCC

VOC

VCC

VOD

Figure 6. Receiver Propagation Delay Test Circuit

GENERATOR

(NOTE 1)

50Ω

1.5V

VID

OUT

CL = 15pF

(NOTE 2)

VOM = VCC

GENERATOR

(NOTE 1)

50Ω

OUT

VCC

RL =

60Ω

CL = 15pF (NOTE 2)

Figure 3. Driver Differential Output Delay and

Transition Time Circuit

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