Datasheet

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DIN
DOUT
Auto-Powerdown
Plus
INVALID
RIN
FORCEOFF
FORCEON
ROUT
11
16
9
13
10
8
1
12
READY
MAX3227
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV ESD PROTECTION
SLLS673A – AUGUST 2005 – REVISED FEBRUARY 2006
TERMINAL FUNCTIONS
TERMINAL
DESCRIPTION
NAME NO.
C1+ 2 Positive terminal of voltage-doubler charge-pump capacitor
C1– 4 Negative terminal of voltage-doubler charge-pump capacitor
C2+ 5 Positive terminal of inverting charge-pump capacitor
C2– 6 Negative terminal of inverting charge-pump capacitor
DIN 11 CMOS driver input
DOUT 13 RS-232 driver output
Force-off input, active low. Drive low to shut down drivers, receivers, and charge pump. This overrides auto-shutdown
FORCEOFF 16
and FORCEON (see Function Table).
Force-on input, active high. Drive high to override powerdown, keeping drivers and receivers on (FORCEOFF must be
FORCEON 12
high) (see Function Table).
GND 14 Ground
INVALID 10 Valid signal detector output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input.
Ready to transmit output, active high. READY is enabled high when V– goes below –3.5 V and the device is ready to
READY 1
transmit.
RIN 8 RS-232 receiver input
ROUT 9 CMOS receiver output
V+ 3 +2 × V
CC
generated by the charge pump
V– 7 –2 × V
CC
generated by the charge pump
V
CC
15 3-V to 5.5-V single-supply voltage
LOGIC DIAGRAM (POSITIVE LOGIC)
3
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