MAX3228E-MAX3229E Datasheet, PDF (1/15 Pages) Maxim Integrated Products – ±15kV ESD-Protected +2.5V to +5.5V RS-232 Transceivers in UCSP

19-2139; Rev 1; 5/04
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
General Description
The MAX3228E/MAX3229E are +2.5V to +5.5V pow-
ered EIA/TIA-232 and V.28/V.24 communications inter-
faces with low power requirements, high data-rate
capabilities, and enhanced electrostatic discharge
(ESD) protection, in a chip-scale package (UCSP™).
All transmitter outputs and receiver inputs are protect-
ed to ±15kV using IEC 1000-4-2 Air-Gap Discharge,
±8kV using IEC 1000-4-2 Contact Discharge, and
±15kV using the Human Body Model.
The MAX3228E/MAX3229E achieve a 1µA supply cur-
rent 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 MAX3228E/MAX3229E offer a separate power-sup-
ply 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 pro-
vides the MAX3228E/MAX3229E compatibility with mul-
tiple logic families.
The MAX3229E contains one receiver and one transmit-
ter. The MAX3228E contains two receivers and two
transmitters. The MAX3228E/MAX3229E 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
♦ 6 ✕ 5 Chip-Scale Packaging (UCSP)
♦ ESD Protection for RS-232 I/O Pins:
±15kV—IEC 1000-4-2 Air-Gap Discharge
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—Human Body Model
♦ 1µA Low-Power AutoShutdown
♦ 250kbps Guaranteed Data Rate
♦ Meets EIA/TIA-232 Specifications Down to +3.1V
♦ RS-232 Compatible to +2.5V Allows Operation
from Single Li+ Cell
♦ Small 0.1µF Capacitors
♦ Configurable Logic Levels
Ordering Information
PART
MAX3228EEBV
MAX3229EEBV
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 x 5 UCSP*
6 x 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
0.1µF
A1
C1 _C1+
VCC
A5
VL
B1
V+
D1 _C1-
A2 _C2+
A3 _C2-
A6 T1IN
MAX3228E
VL
V- ^A4
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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