3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers
Using Four 0.1µF External Capacitors
General Description
The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary
low-dropout transmitter output stage enabling true RS-232
performance from a 3.0V to 5.5V supply with a dual charge pump. The
devices require only four small 0.1µF external chargepump
capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run
at data rates of 120kbps while maintaining RS-232 output levels.
The MAX3237 is guaranteed to run at data rates of 250kbps in the
normal operating mode and 1Mbps in the MegaBaud™ operating mode,
while maintaining RS-232 output levels.
The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222
features a 1µA shutdown mode that reduces power consumption and
extends battery life in portable systems. Its receivers remain
active in shutdown mode, allowing external devices such as modems
to be monitored using only 1µA supply current. The MAX3222 and
MAX3232 are pin, package, and functionally compatible with the
industry-standard MAX242 and MAX232, respectively.
The MAX3241 is a complete serial port (3 drivers/ 5 receivers)
designed for notebook and subnotebook computers. The MAX3237 (5
drivers/3 receivers) is ideal for fast modem applications. Both
these devices feature a shutdown mode in which all receivers can
remain active while using only 1µA supply current. Receivers R1
(MAX3237/MAX3241) and R2 (MAX3241) have extra outputs in addition
to their standard outputs. These extra outputs are always active,
allowing external devices such as a modem to be monitored without
forward biasing the protection diodes in circuitry that may have VCC completely removed.
The MAX3222, MAX3237, and MAX3241 are available in space-saving
TSSOP and SSOP packages.
Applications
- Notebook, Subnotebook, and Palmtop Computers
- High-Speed Modems
- Battery-Powered Equipment
- Hand-Held Equipment
- Peripherals
- Printers
Features
♦ Low Supply Current:
300µA (MAX3222/MAX3232/MAX3241)
500µA (MAX3237)
♦ Guaranteed Data Rate:
120kbps (MAX3222/MAX3232/MAX3241)
250kbps (MAX3237—Normal Operation)
1Mbps (MAX3237—MegaBaud Operation)
♦ 1µA Low-Power Shutdown with Receivers Active
(MAX3222/MAX3237/MAX3241)
♦ Flow-Through Pinout (MAX3237)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed Mouse Driveability (MAX3241)
♦ Pin Compatible with Industry-Standard MAX232 (MAX3232)
Pin Compatible with Industry-Standard MAX242 (MAX3222)
♦ Guaranteed Slew Rate:
6V/µs (MAX3222/MAX3232/MAX3237/MAX3241)
24V/µs (MAX3237—MegaBaud Operation)
ABSOLUTE MAXIMUM RATINGS
VCC...........................................................................-0.3V
to +6V
V+ (Note
1)...............................................................-0.3V
to +7V
V- (Note 1)
................................................................+0.3V
to -7V
V+ + V- (Note
1)...................................................................+13V
Input Voltages
T_IN, SHDN, EN
...................................................-0.3V to +6V
MBAUD...................................................-0.3V to
(VCC + 0.3V)
R_IN
.................................................................................±25V
Output Voltages
T_OUT...........................................................................±13.2V
R_OUT....................................................-0.3V to
(VCC + 0.3V)
Short-Circuit Duration
T_OUT
....................................................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ....696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW
16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ..889mW
18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
20-Pin TSSOP (derate 7.0mW/°C above +70°C).............559mW
28-Pin SO (derate 12.50mW/°C above +70°C).....................1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW
Operating Temperature Ranges
MAX32_ _C_
_.....................................................0°C to +70°C
MAX32_ _E_ _ .................................................-40°C
to +85°C
Storage Temperature Range .............................-65°C to
+150°C
Lead Temperature (soldering, 10sec)
.............................+300°C
Note 1: V+ and V- can have a maximum magnitude of 7V, but their
absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may
cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of
the specifications is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Ordering Information
| PART TEMP.RANGE PIN-PACKAGE |
| MAX3222CUP 0°C to +70°C 20 TSSOP |
| MAX3222CAP 0°C to +70°C 20 SSOP |
| MAX3222CWN 0°C to +70°C 18 SO |
| MAX3222CPN 0°C to +70°C 18 Plastic DIP |
Pin Configurations
