MAX218CSLASHD datasheet(3/8 Pages) MAXIM

3 / 8 page

1.8V to 4.25V-Powered,

True RS-232 Dual Transceiver

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TIMING CHARACTERISTICS

(Circuit of Figure 1, VCC = 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, TA = TMIN to TMAX, unless otherwise noted.

Typical values are at VCC = 3.0V, TA = +25°C.)

1000pF

|| 3k

Ω load each transmitter,

150pF load each receiver

TA = +25°C, VCC = 3.0V, RL = 3kΩ to 7kΩ,

CL = 50pF to 2500pF, measured from

+3V to -3V or -3V to +3V

2500pF

|| 3k

Ω load

150pF load

2500pF

|| 3k

Ω load

CONDITIONS

200

500

tDR

Receiver Output Disable Time

300

tER

kbps

120

Data Rate

Receiver Output Enable Time

V/µs

3.0

Transition Region Slew Rate

1.8

2.7

tPLHT

Transmitter Propagation Delay

µs

140

450

tET

Transmitter Output Enable Time

290

700

tPHLR

260

700

tPLHR

Receiver Propagation Delay

µs

1.9

2.7

tPHLT

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

500

tDT

Transmitter Output Disable Time

______________________________________________________________Pin Description

Receiver Inputs

R2IN, R1IN

11, 12

Transmitter Outputs; swing between V+ and V-.

T2OUT, T1OUT

13, 14

Negative Supply generated on-board

V-

Terminals for Negative Charge-Pump Capacitor

C1-, C1+

16, 18

Positive Supply generated on-board

V+

Ground. Connect all GND pins to ground.

GND

5, 17, 20

Supply Voltage Input; 1.8V to 4.25V. Bypass to GND with at least 1µF. See

Capacitor

Selection section.

VCC

Transmitter Inputs

T1IN, T2IN

7, 8

Receiver Outputs; swing between GND and VCC.

R1OUT, R2OUT

9, 10

Receiver Output Enable Control. Connect to VCC for normal operation. Connect to GND to

force the receiver outputs into high-Z state.

Shutdown Control. Connect to VCC for normal operation. Connect to GND to shut down the

power supply and to disable the drivers. Receiver status is not changed by this control.

—

–

Not internally connected

N.C.

Inductor/Diode Connection Point

FUNCTION

NAME

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