MAX3318 Datasheet, PDF (5/18 Pages) Texas Instruments – 2.5-V 460-kbps RS-232 TRANSCEIVER WITH ±15-kV ESD PROTECTION

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TERMINAL
NAME
NO.
C1+
2
C1–
4
C2+
5
C2–
6
DIN
12, 13
DOUT
8, 17
FORCEOFF
20
FORCEON
14
GND
18
INVALID
11
READY
RIN
ROUT
V+
V–
V_CC
1
9, 16
10, 15
3
7
19
MAX3318
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ±15-kV ESD PROTECTION
SLLS687 – OCTOBER 2005
TERMINAL FUNCTIONS
DESCRIPTION
Positive voltage-doubler charge-pump capacitor
Negative voltage-doubler charge-pump capacitor
Positive inverting charge-pump capacitor
Negative inverting charge-pump capacitor
CMOS driver inputs
RS-232 driver outputs
Force-off input, active low. Drive low to power down transmitters, receivers, and charge pump. This overrides
auto power down and FORCEON (see Function Table).
Force-on input, active high. Drive high to override auto power down, keeping transmitters and receivers on
(FORCEOFF must be high) (see Function Table).
Ground
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 transmit.
RS-232 receiver inputs
CMOS receiver outputs
2 × V_CC generated by the charge pump
–2 × V_CC generated by the charge pump
2.25-V to 3-V single-supply voltage
5