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鈩?.
The MAX3228/MAX3229 achieve a 1碌A(chǔ) supply current
with Maxim鈥檚 AutoShutdown鈩?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 0.1碌F 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擄C to
+85擄C.
o
6
鉁?/div>
5 Chip-Scale Packaging (UCSP)
o
1碌A(chǔ) 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 0.1碌F Capacitors
o
Configurable Logic Levels
Features
MAX3228/MAX3229
Ordering Information
PART
MAX3228EBV
MAX3229EBV
TEMP. RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-
PACKAGE
6
鉁?/div>
5 UCSP*
6
鉁?/div>
5 UCSP*
*Requires solder temperature profile described in the Absolute
Maximum Ratings section.
*UCSP reliability is integrally linked to the user鈥檚 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
0.1碌F
C
BYPASS
0.1碌F
A1
C1
C1+
C1-
C2+
C2-
V
L
T1OUT
V
L
B6 T2IN
V
L
D6 R1OUT
R1IN
E6
T2OUT E4
E3
RS-232
OUTPUTS
V
CC
A5
V
L
V+
B1
C3
0.1碌F
A4
C4
0.1碌F
Applications
Personal Digital Assistants
Cell Phone Data Lump Cables
Set-Top Boxes
Hand-Held Devices
Cell Phones
C1
0.1碌F
D1
A2
MAX3228
V-
C2
0.1碌F
A3
A6 T1IN
TTL/CMOS
INPUTS
Typical Operating Circuits continued at end of data sheet.
Pin Configurations appear at end of data sheet.
TTL/CMOS
OUTPUTS
C6 R2OUT
V
L
5k鈩?/div>
R2IN E5
RS-232
INPUTS
5k鈩?/div>
UCSP is a trademark of Maxim Integrated Products, Inc.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
20碌A(chǔ)
B5 FORCEON
V
L
V
L
INVALID
20碌A(chǔ)
E2
TO POWER-
MANAGEMENT
UNIT
V
L
FORCEOFF C5
GND
E1
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
MAX3228 PDF文件相關(guān)型號
MAX3228EBV,MAX3228-MAX3229,MAX3229,MAX3229EBV
MAX3228相關(guān)型號PDF文件下載
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