MAX218EWP 查看數據表（PDF） - Maxim Integrated

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MAX218EWP

1.8V to 4.25V-Powered, True RS-232 Dual Transceiver

Maxim Integrated 

1.8V to 4.25V-Powered,

True RS-232 Dual Transceiver

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.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Data Rate

1000pF || 3kΩ load each transmitter,

120

150pF load each receiver

kbps

Receiver Output Enable Time

Receiver Output Disable Time

Transmitter Output Enable Time

Transmitter Output Disable Time

Receiver Propagation Delay

Transmitter Propagation Delay

tER

tDR

tET

tDT

tPHLR

tPLHR

tPHLT

tPLHT

Transition Region Slew Rate

150pF load

150pF load

2500pF || 3kΩ load

2500pF || 3kΩ load

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

CL = 50pF to 2500pF, measured from

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

90

300

ns

200

500

ns

140

450

µs

500

ns

290

700

ns

260

700

1.9

2.7

µs

1.8

2.7

3.0

30

V/µs

______________________________________________________________Pin Description

PIN

1

2

3

4

5, 17, 20

6

7, 8

9, 10

11, 12

13, 14

15

16, 18

19

NAME

LX

N.C.

S—H—D—N–

EN

GND

VCC

T1IN, T2IN

R1OUT, R2OUT

R2IN, R1IN

T2OUT, T1OUT

V-

C1-, C1+

V+

Inductor/Diode Connection Point

Not internally connected

FUNCTION

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.

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

force the receiver outputs into high-Z state.

Ground. Connect all GND pins to ground.

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

Selection section.

Transmitter Inputs

Receiver Outputs; swing between GND and VCC.

Receiver Inputs

Transmitter Outputs; swing between V+ and V-.

Negative Supply generated on-board

Terminals for Negative Charge-Pump Capacitor

Positive Supply generated on-board

_______________________________________________________________________________________ 3

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