MAX3311 Maxim, MAX3311 Datasheet - Page 5

• Manufacturer Part Number: MAX3311
• Description: 460kbps / 1A Supply Current / RS-232-Compatible Transceivers in MAX
• Manufacturer: Maxim

The MAX3311/MAX3313 internal power supply has a
single inverting charge pump that provides a negative
voltage from a single +5V supply. The charge pump
operates in a discontinuous mode and requires a flying
capacitor (C1) and a reservoir capacitor (C2) to gener-
ate the V- supply.
The transmitter is an inverting level translator that con-
verts CMOS-logic levels to EIA/TIA-232-compatible lev-
els. It guarantees data rates up to 460kbps with
worst-case loads of 3kΩ in parallel with 1000pF. When
SHDN is driven low, the transmitter is disabled and put
into three state. The transmitter input does not have an
internal pullup resistor.
The MAX3311/MAX3313 receiver converts RS-232 sig-
nals to CMOS-logic output levels. The MAX3311 receiv-
er will remain active during shutdown mode. The
MAX3313 INVALID indicates when an RS-232 signal is
present at the receiver input, and therefore when the
port is in use.
The MAX3313 INVALID output is pulled low when no
valid RS-232 signal level is detected on the receiver
input.
In shutdown mode, the charge pump is turned off, V- is
pulled to ground, and the transmitter output is disabled
(Table 1). This reduces supply current typically to 1µA.
The time required to exit shutdown is typically less than
100µs.
The capacitor type used for C1 and C2 is not critical for
proper operation; either polarized or nonpolarized
capacitors are acceptable. If polarized capacitors are
used, connect polarity as shown in the Typical
Operating Circuit. The charge pump requires 0.1µF
capacitors. Increasing the capacitor values (e.g., by a
Table 1. MAX3311 Shutdown Logic Truth
Table
SHDN
H
L
Single Charge-Pump Voltage Converter
TRANSMITTER
OUTPUT
High Z
Active
RS-232-Compatible Transceivers in µMAX
Applications Information
_______________________________________________________________________________________
MAX3311 Shutdown Mode
RS-232-Compatible Driver
Detailed Description
RECEIVER
OUTPUT
Capacitor Selection
Active
Active
RS-232 Receiver
460kbps, 1µA Supply Current,
CHARGE
Inactive
PUMP
Active
factor of 2) reduces power consumption. C2 can be
increased without changing C1’s value. However, do
not increase C1’s value without also increasing the
value of C2 and C
(C1 to the other capacitors).
When using the minimum 0.1µF capacitors, make sure
the capacitance does not degrade excessively with
temperature. If in doubt, use capacitors with a larger
nominal value. The capacitor’s equivalent series resis-
tance (ESR) usually rises at low temperatures and influ-
ences the amount of ripple on V-.
To reduce the output impedance at V-, use larger
capacitors (up to 10µF).
Bypass V
tions sensitive to power-supply noise generated by the
charge pump, decouple V
tor the same size as (or larger than) charge-pump
capacitors C1 and C2.
Figure 1 shows the transmitter output when exiting
shutdown mode. The transmitter is loaded with 3kΩ in
parallel with 1000pF. The transmitter output displays no
ringing or undesirable transients as the MAX3311
comes out of shutdown. Note that the transmitter is
enabled only when the magnitude of V- exceeds
approximately -3V.
Figure 1. Transmitter Output when Exiting Shutdown or
Powering Up
1.5V/div
5V/div
0
0
CC
Transmitter Output when Exiting
to ground with at least 0.1µF. In applica-
BYPASS
10µs/div
CC
to maintain the proper ratios
to ground with a capaci-
TIN = GND
TIN = V
CC
Shutdown
TOUT
SHDN
5