MAX3228 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – +2.5V to +5.5V RS-232 Transceivers in UCSP

19-2140; Rev 0; 8/01
+2.5V to +5.5V RS-232 Transceivers
in UCSP
General Description
The MAX3228/MAX3229 are +2.5V to +5.5V powered
EIA/TIA-232 and V.28/V.24 communications interfaces
with low power requirements, and high data-rate capa-
bilities, in a chip-scale package (UCSP™).
The MAX3228/MAX3229 achieve a 1µA supply current
with Maxim’s AutoShutdown™ feature. They save
power without changes to existing BIOS or operating
systems by entering low-power shutdown mode when
the RS-232 cable is disconnected, or when the trans-
mitters of the connected peripherals are off.
The transceivers have a proprietary low-dropout trans-
mitter output stage, delivering RS-232 compliant perfor-
mance from a +3.1V to +5.5V supply, and RS-232
compatible performance with a supply voltage as low
as +2.5V. The dual charge pump requires only four
small 0.1µF capacitors for operation from a +3.0V sup-
ply. Each device is guaranteed to run at data rates of
250kbps while maintaining RS-232 output levels.
The MAX3228/MAX3229 offer a separate power-supply
input for the logic interface, allowing configurable logic
levels on the receiver outputs and transmitter inputs.
Operating over a +1.65V to V_CC range, V_L provides the
MAX3228/MAX3229 compatibility with multiple logic
families.
The MAX3229 contains one receiver and one transmit-
ter. The MAX3228 contains two receivers and two
transmitters. The MAX3228/MAX3229 are available in
tiny chip-scale packaging and are specified across the
extended industrial temperature range of -40°C to
+85°C.
Applications
Personal Digital Assistants
Cell Phone Data Lump Cables
Set-Top Boxes
Hand-Held Devices
Cell Phones
Typical Operating Circuits continued at end of data sheet.
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Features
o 6 ✕ 5 Chip-Scale Packaging (UCSP)
o 1µA Low-Power AutoShutdown
o 250kbps Guaranteed Data Rate
o Meets EIA/TIA-232 Specifications Down to +3.1V
o RS-232 Compatible to +2.5V Allows Operation
from Single Li+ Cell
o Small 0.1µF Capacitors
o Configurable Logic Levels
Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
MAX3228EBV
MAX3229EBV
-40°C to +85°C
-40°C to +85°C
6 ✕ 5 UCSP*
6 ✕ 5 UCSP*
*Requires solder temperature profile described in the Absolute
Maximum Ratings section.
*UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. Refer to the
UCSP Reliabilitly Notice in the UCSP Reliability section of this
data sheet for more information.
Typical Operating Circuits
2.5V TO 5.5V 1.65V TO 5.5V
CBYPASS
C1
0.1µF
C2
0.1µF
TTL/CMOS
INPUTS
0.1µF
A1
C1 _C1+
VCC
0.1µF
A5
VL
B1
V+
D1 _C1-
A2 _C2+
MAX3228
A4
V-
A3 _C2-
A6 T1IN
VL
T1OUT E3
B6 T2IN
VL
T2OUT E4
D6 R1OUT
VL
R1IN E6
C3
0.1µF
C4
0.1µF
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
C6 R2OUT
5kΩ
VL
RS-232
INPUTS
R2IN E5
VL
20µA
B5 FORCEON
5kΩ
VL
INVALID ^E2
20µA
FORCEOFF C5
GND
E1
TO POWER-
MANAGEMENT
UNIT
VL
________________________________________________________________ Maxim Integrated Products 1
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