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PDF MAX3243E Data sheet ( Hoja de datos )
| Número de pieza | MAX3243E | |
| Descripción | RS-232 Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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1. MAX3243E  Hay una vista previa y un enlace de descarga de MAX3243E (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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MAX3221E/
AVAILABLE
MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
General Description Next Generation Device Features
The MAX3221E/MAX3223E/MAX3243E are 3V-powered
EIA/TIA-232 and V.28/V.24 communications interfaces
with automatic shutdown/wakeup features, high data-
rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-
Gap Discharge, to ±8kV using IEC 1000-4-2 Contact
Discharge, and to ±15kV using the Human Body Model.
The MAX3221E/MAX3223E/MAX3243E achieve a
1µA supply current with Maxim’s revolutionary
AutoShutdown™ feature. They save power without
changes to the existing BIOS or operating system by enter-
ing low-power shutdown mode when the RS-232 cable is
disconnected, or when the transmitters of the connected
peripherals are off.
The transceivers have a proprietary low-dropout trans-
mitter output stage, delivering true RS-232 performance
from a +3.0V to +5.5V supply with a dual charge pump.
The charge pump requires only four small 0.1µF capaci-
tors for operation from a +3.3V supply. Each device is
guaranteed to run at data rates of 250kbps while main-
taining RS-232 output levels.
The MAX3221E contains just one driver and one receiver,
making it the smallest single-supply RS-232 transceiver.
The MAX3223E has two drivers and two receivers. The
MAX3243E is a complete 3-driver/5-receiver serial port
ideal for notebook or subnotebook computers. It also
includes two noninverting receiver outputs that are always
active, allowing
forward biasing
tehxeteprnroaFtledcuteinovniccedtsioiotdoenbs eainlmcoDirnciiutaoitrrgeydtrhawatimthmoasuyt
be powered down.
The MAX3221E, MAX3223E, and MAX3243E are avail-
able in space-saving TQFN, SSOP, and TSSOP pack-
ages.
Applications
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Handheld Equipment
Peripherals
Printers
o For Space-Constrained Applications:
MAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V
to +5.5V RS-232 Transceivers in UCSP™
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: ±15kV ESD-Protected Down to 10nA,
+3.0V to +5.5V, Up to 1Mbps, True RS-232
Transceivers (MAX3246E Available in a UCSP
Package)
o For Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with ±15kV ESD-
Protected I/O and Logic Pins
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3221ECTE+
0°C to +70°C
16 TQFN-EP*
MAX3221ECUE+
0°C to +70°C
16 TSSOP
MAX3221ECAE+
0°C to +70°C
16 SSOP
MAX3221EEAE+
-40°C to +85°C 16 SSOP
MAX3221EETE+
-40°C to +85°C 16 TQFN-EP*
MAX3221EEUE+
-40°C to +85°C 16 TSSOP
MAX3223ECPP+
0°C to +70°C
20 PDIP
MAX3223ECAP+
0°C to +70°C
20 SSOP
MAX3223ECUP+
0°C to +70°C
20 TSSOP
MAX3223ECTP+
0°C to +70°C
20 TQFN-EP*
MAX3223EEPP+
-40°C to +85°C 20 PDIP
MAX3223EEAP+
-40°C to +85°C 20 SSOP
MAX3223EEUP+
-40°C to +85°C 20 TSSOP
MAX3223EETP+
-40°C to +85°C 20 TQFN-EP*
MAX3223EEUP/V+ -40°C to +85°C 20 TSSOP
*Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Ordering Information continued at end of data sheet.
PART
NO. OF
DRIVERS/
RECEIVERS
Selector Guide
VCC
RANGE
(V)
AutoShutdown
MAX3221E
1/1 +3.0 to +5.5
Pin Configurations appear at end of data sheet.
MAX3223E
2/2 +3.0 to +5.5
TPyinpiCcaolnOfigpuerationngsCaiprcpueiatsr atpepnedaroaf tdeantadsohfedeat.ta sheet.
MAX3243E
3/5 +3.0 to +5.5
Functional Diagrams continued at end of data sheet.
UAuCtSoPShisutadtorwadneamnadrkUoCfSMPaaxrime tIrnatdeegmraaterkdsPorof dMuacxtism, InInct.egrated Products, Inc.
†Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1283; Rev 7; 8/11
1 page  
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
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.)
MAX3221E/MAX3223E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
45
40
250kbps
35
30 120kbps
25
20
20kbps
15
10
5 T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
0
0 1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3243E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5
4 VOUT+
3
1 TRANSMITTER AT 250kbps
2
2 TRANSMITTERS AT 15.6kbps
1
0
-1
-2
-3
-4 VOUT-
-5
-6
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3243E
SLEW RATE vs. LOAD CAPACITANCE
14
12
10
8
6
4
2
0
0
1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
MAX3243E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
60
50
250kbps
40
120kbps
30
20kbps
20
10 T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
0
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
Maxim Integrated
5
5 Page 
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
RC 1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
RD 1500Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
RC 50MΩ to 100MΩ RD 330Ω
CHARGE CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 6a. Human Body ESD Test Models
Figure 7a. IEC1000-4-2 ESD Test Model
IP 100%
90%
AMPERES
36.8%
10%
0
0
tRL
Ir PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
TIME
tDL
CURRENT WAVEFORM
Figure 6b. Human Body Model Current Waveform
Level 4 (the highest level) of IEC1000-4-2, without the
need for additional ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
lower in the IEC1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 7a shows the IEEE1000-4-2 model and
Figure 7b shows the current waveform for the ±8kV
IEC1000-4-2 Level 4 ESD contact-discharge test.
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method connects
the probe to the device before the probe is energized.
Machine Model
The Machine Model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. Its
objective is to emulate the stress caused by contact that
occurs with handling and assembly during manufactur-
ing. Of course, all pins require this protection during
manufacturing, not just RS-232 inputs and outputs.
I
100%
90%
10%
tr = 0.7ns to 1ns
30ns
60ns
t
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
Therefore, after PC board assembly, the Machine Model
is less relevant to I/O ports.
___________Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; either polarized or nonpolarized
capacitors may be used. The charge pump requires
0.1µF capacitors for 3.3V operation. For other supply
voltages, refer to Table 3 for required capacitor values.
Do not use values smaller than those listed in Table 3.
Increasing the capacitor values (e.g., by a factor of 2)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. C2, C3, and C4 can be
increased without changing C1’s value. However, do
not increase C1 without also increasing the values of
C2, C3, and C4 to maintain the proper ratios (C1 to
the other capacitors).
Maxim Integrated
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX3243E.PDF ] | |
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