MAX3230E Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 15kV ESD-Protected +2.5V to +5.5V RS-232 Transceivers in UCSP

19-3250; Rev 0; 5/04
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
General Description
The MAX3230E/MAX3231E 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 MAX3230E/MAX3231E achieve a 1µA supply cur-
rent with Maxim’s AutoShutdown™ feature. They save
power without changing the 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 MAX3230E/MAX3231E 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 MAX3230E/MAX3231E compatibility with mul-
tiple logic families.
The MAX3231E contains one receiver and one transmit-
ter. The MAX3230E contains two receivers and two trans-
mitters. The MAX3230E/MAX3231E are available in tiny
chip-scale packaging and are specified across the
extended industrial (-40°C to +85°C) temperature range.
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 x 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
♦ Meet 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
MAX3230EEBV-T
MAX3231EEBV-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
BUMP-PACKAGE
6 x 5 UCSP
6 x 5 UCSP
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
MAX3230E
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
B5 FORCEON
5kΩ
INVALID ^E2
FORCEOFF C5
GND
E1
TO POWER-
MANAGEMENT
UNIT
VL
________________________________________________________________ Maxim Integrated Products 1
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