MAX3320ACAP 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3320ACAP

3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power-On Reset

Maxim Integrated 

3V to 5.5V, up to 250kbps True RS-232 Transceiver

with 4µA AutoShutdown Plus and Power-On Reset

____________________________Typical Operating Characteristics (continued)

(VCC = 3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ. Typical values are at TA = +25°C, unless

otherwise noted.)

MAXIMUM TRANSIENT DURATION

vs. RESET COMPARATOR OVERDRIVE

300

250

SHUTDOWN MODE

200

150

100

NOT IN

SHUTDOWN

50

MODE

CBYPASS = 0.1µF

0

10

100

1000

RESET COMPARATOR OVERDRIVE (mV)

NORMALIZED POWER-UP RESET

DELAY vs. TEMPERATURE

1.040

1.030

1.020

1.010

1.000

0.990

0.980

0.970

0.960

-40 -20 0

20 40 60 80

TEMPERATURE (°C)

______________________________________________________________Pin Description

PIN

1

2

3

4

5, 6

7, 8

9

10

11

12

13, 14

15, 16

17

18

19

20

NAME

V+

C2+

C2-

V-

T_IN

R_OUT

INVALID

RESET

FORCEOFF

FORCEON

R_IN

T_OUT

GND

C1-

VCC

C1+

FUNCTION

5.5V generated by the charge pump

Positive terminal of inverting charge-pump capacitor

Negative terminal of inverting charge-pump capacitor

-5.5V generated by the charge pump

TTL/CMOS Transmitter Inputs (T1IN and T2IN)

TTL/CMOS Receiver Outputs (R1OUT and R2OUT)

Output of the Valid Signal Detector. Asserts when no valid RS-232 levels are present on any of

the receiver inputs for 90µs.

RESET Output. RESET remains low while VCC is below the reset threshold, and for 280ms (max)

after VCC rises above the reset threshold.

Force-Off Input. Drive FORCEOFF low to shut down transmitters and on-board power supply.

This overrides AutoShutdown Plus and FORCEON (Table 1).

Force-On Input. Drive FORCEON high to override AutoShutdown Plus, keeping transmitters on

(FORCEOFF must be high) (Table 1).

RS-232 Receiver Inputs (R2IN and R1IN)

RS-232 Transmitter Outputs (T2OUT and T1OUT)

Ground

Negative terminal of voltage-doubler charge-pump capacitor

+3V to +5.5V Supply Voltage

Positive terminal of voltage-doubler charge-pump capacitor

_______________________________________________________________________________________ 5

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