Datasheet

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DIN
DOUT
Auto-Powerdown
Plus
INVALID
RIN
FORCEOFF
FORCEON
ROUT
11
16
9
13
10
8
1
12
READY
MAX3227E
3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV IEC ESD PROTECTION
SLLS715A – FEBRUARY 2006 – REVISED JUNE 2007
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
FORCEON 12
be 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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