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PDF MAX3311 Data sheet ( Hoja de datos )
| Número de pieza | MAX3311 | |
| Descripción | 460kbps / 1A Supply Current / RS-232-Compatible Transceivers in MAX | |
| Fabricantes | Maxim Integrated | |
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19-1901; Rev 0; 2/01
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
General Description
The MAX3311/MAX3313 are low-power, +5V EIA/TIA-
232-compatible transceivers. Both devices have one
transmitter and one receiver. The transceivers have a
proprietary low-dropout transmitter output stage
enabling RS-232-compatible operation from a +5V sup-
ply with a single inverting charge pump. These devices
require only three 0.1µF capacitors and will run at data
rates up to 460kbps while maintaining RS-232-compati-
ble output levels.
The MAX3311 features a 1µA shutdown mode. In shut-
down the device turns off the charge pump, pulls V- to
ground, and the transmitter output is disabled. The
MAX3313 features an INVALID output that asserts high
when an active RS-232 cable signal is connected, sig-
naling to the host that a peripheral is connected to the
communication port.
________________________Applications
Digital Cameras
PDAs
GPS
POS
Telecommunications
Handy Terminals
Set-Top Boxes
Pin Configurations
TOP VIEW
VCC 1
C1- 2
SHDN 3
TIN 4
ROUT 5
MAX3311
µMAX
10 GND
9 C1+
8 V-
7 TOUT
6 RIN
Pin Configurations continued at end of data sheet.
Features
o 1µA Low-Power Shutdown (MAX3311)
o INVALID Output (MAX3313)
o Receiver Active in Shutdown (MAX3311)
o Single Transceiver (1Tx/1Rx) in 10-Pin µMAX
o RS-232-Compatible Operation
PART
MAX3311CUB
MAX3311EUB
MAX3313CUB
MAX3313EUB
Ordering Information
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Typical Operating Circuit
+5V
CBYPASS
0.1µF
C1
0.1µF
9 C1+
2 C1-
4 TIN
1
VCC V- 8
MAX3311
MAX3313
TOUT 7
C2
0.1µF
5 ROUT
RIN 6
5kΩ
SHDN (MAX3311) 3
INVALID (MAX3313)
GND
10
CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
Detailed Description
Single Charge-Pump Voltage Converter
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.
RS-232-Compatible Driver
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.
RS-232 Receiver
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.
MAX3311 Shutdown Mode
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.
Applications Information
Capacitor Selection
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
L
H
TRANSMITTER
OUTPUT
High Z
Active
RECEIVER
OUTPUT
Active
Active
CHARGE
PUMP
Inactive
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 CBYPASS to maintain the proper ratios
(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 VCC to ground with at least 0.1µF. In applica-
tions sensitive to power-supply noise generated by the
charge pump, decouple VCC to ground with a capaci-
tor the same size as (or larger than) charge-pump
capacitors C1 and C2.
Transmitter Output when Exiting
Shutdown
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.
5V/div
0
1.5V/div
0
TIN = GND
SHDN
TOUT
TIN = VCC
10µs/div
Figure 1. Transmitter Output when Exiting Shutdown or
Powering Up
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX3311.PDF ] | |
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