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PDF MAX3229EEBV Data sheet ( Hoja de datos )
| Número de pieza | MAX3229EEBV | |
| Descripción | 15kV ESD-Protected @.5V to %.5V RS-232 Transceivers in UCSP | |
| Fabricantes | Maxim Integrated | |
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19-2139; Rev 0; 8/01
±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 VCC range, VL 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
o 6 ✕ 5 Chip-Scale Packaging (UCSP)
o 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
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
MAX3228EEBV
MAX3229EEBV
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
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
0.1µF
C1 C1+
A1
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
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.)
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MAX3229E)
20
18
16
14
12
10
8
6
4
2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
TRANSMITTER OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE (VCC RISING)
10
8
6
4
VOH
2
0
-2 VOL
-4
-6
-8
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
TRANSMITTER OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE (VCC FALLING)
10
8
6
4
VOH
2
0
-2 VOL
-4
-6
-8
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
Pin Description
PIN
MAX3228E MAX3229E
A1 A1
A2 A2
A3 A3
A4 A4
A5 A5
A6, B6
B1
A6
B1
B2, B3, B4,
C2, C3, C4,
D2, D3, D4,
D5
B2, B3, B4,
C2, C3, C4,
D2, D3, D4,
D5
B5 B5
—
B6, D6,
E4, E6
C1 C1
NAME
VCC
C2+
C2-
V-
VL
T_IN
V+
N.C.
FORCEON
N.C.
C1+
FUNCTION
+2.5V to +5.5V Supply Voltage
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V/-4.0V Generated by Charge Pump
Logic-Level Input for Receiver Outputs and Transmitter Inputs. Connect VL to the
system logic supply voltage or VCC if no logic supply is required.
Transmitter Input(s)
+5.5V/+4.0V Generated by Charge Pump. If charge pump is generating +4.0V, the part
has switched from RS-232 compliant to RS-232 compatible mode.
No Connection. These locations are not populated with solder bumps.
FORCEON Input, Active-High. Drive FORCEON high to override automatic circuitry,
keeping transmitters and charge pumps on. Pulls itself high internally if not connected.
No Connection. These locations are populated with solder bumps, but are electrically
isolated.
Positive Terminal of Positive Regulated Charge-Pump Capacitor
_______________________________________________________________________________________ 5
5 Page 
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
Transmitter Outputs when
Exiting Shutdown
Figure 7 shows a transmitter output when exiting shut-
down mode. The transmitter is loaded with 3kΩ in par-
allel with 1000pF. The transmitter output displays no
ringing or undesirable transients as it comes out of
shutdown, and is enabled only when the magnitude of
V- exceeds approximately -3V.
High Data Rates
The MAX3228E/MAX3229E maintain the RS-232 ±5.0V
minimum transmitter output voltage even at high data
rates. Figure 8 shows a transmitter loopback test cir-
cuit. Figure 9 shows a loopback test result at 120kbps,
and Figure 10 shows the same test at 250kbps. For
Figure 9, the transmitter was driven at 120kbps into an
RS-232 load in parallel with 1000pF. For Figure 10, a
single transmitter was driven at 250kbps, and loaded
with an RS-232 receiver in parallel with 1000pF.
FORCEON =
FORCEOFF
5V/div
0
TOUT
2V/div
0
4µs/div
Figure 7. Transmitter Outputs Exiting Shutdown or Powering Up
VCC VL
0.1µF
C1
C2
C1+ VCC
VL V+
C1-
MAX3229E
C2+
V-
C2- VL
T1IN T1OUT
R1OUT
VL
R1IN
0.1µF
C3
C4
1000pF
5kΩ
FORCEON
INVALID
GND FORCEOFF
TO POWER-
MANAGEMENT UNIT
VL
T_IN
T_OUT
R_OUT
4µs/div
Figure 9. Loopback Test Result at 120kbps
5V
0
5V
0
-5V
5V
0
T_IN
T_OUT
R_OUT
4µs/div
Figure 10. Loopback Test Result at 250kbps
5V
0
5V
0
-5V
5V
0
Figure 8. Transmitter Loopback Test Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX3229EEBV.PDF ] | |
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