19-1289; Rev 1; 3/98
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 1µA Supply Current
The MAX3224–MAX3227/MAX3244/MAX3245 are 3V-
powered EIA/TIA-232 and V.28/V.24 communications
interfaces with automatic shutdown/wakeup features
and high data-rate capabilities.
♦ AutoShutdown Plus—EDN Innovation of the Year
♦ Guaranteed Data Rate:
All devices achieve a 1µA supply current using Maxim’s
re volutiona ry AutoShutd own Plus ™ fe a ture . The s e
d e vic e s a utoma tic a lly e nte r a low-p owe r s hutd own
mode when the RS-232 cable is disconnected or the
transmitters of the connected peripherals are inactive,
and the UART driving the transmitter inputs is inactive
for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiv-
e r inp ut. AutoShutd own Plus s a ve s p owe r without
changes to the existing BIOS or operating system.
250kbps (MAX3224/3226/3244)
1Mbps (MAX3225/3227/3245)
♦ Guaranteed Slew Rate:
6V/µs (MAX3224/3226/3244)
24V/µs (MAX3225/3227/3245)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed Mouse Driveability (MAX3244/3245)
♦ Ready-to-Transmit Logic-Level Output
The MAX3225/MAX3227/MAX3245 a ls o fe a ture
MegaBaud™ operation, guaranteeing 1Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224/MAX3226/MAX3244 guarantee
250kbps operation. The 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 charge pump requires only four
small 0.1µF capacitors for operation from a 3.3V supply.
The MAX3224–MAX3227 feature a logic-level output
(READY) that asserts when the charge pump is regulat-
ing and the device is ready to begin transmitting.
_______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 SSOP
MAX3224CPP
MAX3224CAP
MAX3224EPP
MAX3224EAP
MAX3225CPP
MAX3225CAP
MAX3225EPP
MAX3225EAP
20 Plastic DIP
20 SSOP
20 Plastic DIP
20 SSOP
All devices are available in a space-saving SSOP pack-
age.
20 Plastic DIP
20 SSOP
________________________Ap p lic a t io n s
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Ordering Information continued at end of data sheet.
_____________________ S e le c t o r Gu id e
Battery-Powered Equipment
Hand-Held Equipment
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
AUTO-
SHUTDOWN
PLUS
READY
OUTPUT
PART
Peripherals
Printers
✔
✔
✔
✔
—
—
✔
✔
✔
✔
✔
✔
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
2/2
2/2
1/1
1/1
3/5
3/5
250k
1M
250k
1M
250k
1M
AutoShutdownPlus and MegaBaud are trademarks of Maxim Integrated Products.
†
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.