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PDF MAX3221 Data sheet ( Hoja de datos )
| Número de pieza | MAX3221 | |
| Descripción | 1A Supply Current / True +3V to +5.5V RS 232 Transceiver with AutoShutdown | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX3221 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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MAX3221/MAX3223/MAX3243
+3V to +5.5V RS-232
Transceivers with AutoShutdown
General Description
The MAX3221/MAX3223/MAX3243 achieve 1µA supply
current with Maxim’s revolutionary AutoShutdown™
feature. When the MAX3221/MAX3223/MAX3243 do not
sense a valid signal level on their receiver inputs, the
on-board power supply and drivers shut down. This
occurs if the RS-232 cable is disconnected or if the
transmitters of the connected peripheral are turned off.
The system turns on again when a valid level is applied
to any RS-232 receiver input.
The MAX3221/MAX3223/MAX3243 require only 0.1µF
capacitors in 3.3V operation, and can operate from
input voltages ranging from +3.0V to +5.5V.
A proprietary, high-efficiency, dual charge-pump power
supply and a low-dropout transmitter combine to deliv-
er true RS-232 performance from a single +3.0V to
+5.5V supply.
The MAX3221 is a 1-driver/1-receiver 16-pin SSOP
version of the 20-pin 2-driver/2-receiver MAX3223.
The MAX3243 is a 3-driver/5-receiver with a comple-
mentary always-active receiver for external monitoring
in a variety of 28 pin packages. Please see order
information table for package offerings.
Applications
• Battery-Powered Equipment
• Hand-Held Equipment
• Peripherals
• Portable Diagnostics Equipment
Selector Guide
PART
Tx Rx VCC RANGE (V) AutoShutdown
MAX3221
MAX3223
1
2
1
2
3.0 to 5.5
3.0 to 5.5
Yes
Yes
MAX3243 3
5
3.0 to 5.5
Yes
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
Benefits and Features
• Integrated Charge Pump Circuitry Simplifies Power
Requirements
• Eliminates the Need for a ±12 Supply
• Operation From a Single +3.3V or +5V Supply
• 1µA Supply Current in Shutdown Mode Saves Power
• AutoShutdown Feature is Enabled After No Activity
on Receiver Inputs for 30µs
• Software Control Option for Shutdown
Ordering Information
PART
MAX3221CAE
MAX3221CUE†
MAX3221EAE
MAX3221EUE†
MAX3223CPP
MAX3223CAP
MAX3223CUP
MAX3223EPP
MAX3223EAP
MAX3223EUP
MAX3243CWI
MAX3243CAI
MAX3243CUI
MAX3243EWI
MAX3243EAI
MAX3243EUI
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 SSOP
16 TSSOP
16 SSOP
16 TSSOP
20 Plastic DIP
20 SSOP
20 TSSOP
20 Plastic DIP
20 SSOP
20 TSSOP
28 Wide SO
28 SSOP
28 TSSOP
28 Wide SO
28 SSOP
28 TSSOP
†Future product—contact factory for availability.
19-0306; Rev 9; 1/15
1 page  
MAX3221/MAX3223/MAX3243
+3V to +5.5V RS-232 Transceivers
with AutoShutdown
Pin Description
MAX3221
1
5
6
7
8
13
11
9
—
10
16
12
4
14
15
3
2
PIN
MAX3223
1
5
6
7
9, 16
8, 17
12, 13
10, 15
—
11
20
14
4
18
19
3
2
MAX3243
—
1
2
3
4–8
9, 10, 11
12, 13, 14
15–19
20
21
NAME
EN
C2+
C2-
V-
R_IN
T_OUT
T_IN
R_OUT
R2OUTB
INVALID
22 FORCEOFF
23 FORCEON
24 C1-
25 GND
26 VCC
27 V+
28 C1+
FUNCTION
Receiver Enable Control. Drive low for normal operation. Drive high to force
the receiver outputs into a high-Z state.
Positive terminal of inverting charge-pump capacitor
Negative terminal of inverting charge-pump capacitor
-5.5V generated by the charge pump
RS-232 Receiver Inputs
RS-232 Transmitter Outputs
TTL/CMOS Transmitter Inputs
TTL/CMOS Receiver Outputs
Noninverting Receiver Output—active in shutdown
Output of the valid signal detector. Indicates if a valid RS-232 level is pres-
ent on receiver inputs logic “1”.
Drive low to shut down transmitters and on-board power supply. This over-
rides all automatic circuitry and FORCEON (Table 1).
Drive high to override automatic circuitry keeping transmitters on
(FORCEOFF must be high) (Table 1).
Negative terminal of the voltage doubler charge-pump capacitor
Ground
+3.0V to +5.5V Supply Voltage
+5.5V generated by the charge pump
Positive terminal of the voltage doubler charge-pump capacitor
Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3221/MAX3223/MAX3243’s internal power
supply consists of a regulated dual charge pump that
provides output voltages of +5.5V (doubling charge
pump) and -5.5V (inverting charge pump), regardless
of the input voltage (VCC) over the +3.0V to +5.5V
range. The charge pumps operate in a discontinuous
mode: if the output voltages are less than 5.5V, the
charge pumps are enabled; if the output voltages
exceed 5.5V, the charge pumps are disabled. Each
charge pump requires a flying capacitor (C1, C2) and
a reservoir capacitor (C3, C4) to generate the V+ and
V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They
guarantee a 120kbps data rate with worst-case loads of
3kΩ in parallel with 1000pF, providing compatibility with
PC-to-PC communication software (such as Laplink™).
Typically, the MAX3221/MAX3223/MAX3243 can oper-
ate at data rates of 235kbps. Transmitters can be paral-
leled to drive multiple receivers or mice (MAX3243).
Figure 1 shows a complete system connection.
When FORCEOFF is driven to ground, or the Auto-
Shutdown circuitry senses invalid voltage levels at all
receiver inputs, the transmitters are disabled and the
outputs are forced into a high-impedance state.
LapLink is a trademark of Traveling Software.
www.maximintegrated.com
Maxim Integrated | 5
5 Page 
MAX3221/MAX3223/MAX3243
+3V to +5.5V RS-232 Transceivers
with AutoShutdown
VCC
0.1μF
C1+
C1
C1-
C2+
C2
C2-
T_ IN
VCC
MAX3221
MAX3223
MAX3243
V+
V-
T_ OUT
R_ OUT
0V EN (MAX3221/3)
R_ IN
5kΩ
VCC FORCEOFF
GND
C3
C4
1000pF
Figure 8. Loopback Test Circuit
Table 3. Required Capacitor Values
VCC
(V)
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
C1
(µF)
0.1
0.047
0.1
C2, C3, C4
(µF)
0.1
0.33
0.47
Table 4. Logic Family Compatibility with
Various Supply Voltages
SYSTEM
POWER-
SUPPLY
VOLTAGE
(V)
3.3
5
5
VCC SUPPLY
VOLTAGE
(V)
COMPATIBILITY
3.3
Compatible with all CMOS
families.
5
Compatible with all TTL and
CMOS-logic families.
Compatible with ACT and
3.3
HCT CMOS, and with TTL.
Incompatible with AC, HC,
or CD4000 CMOS.
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
VCC = +3.3V, 120kbps
C1–C4 = 0.1μF
5μs/div
Figure 9. Loopback Test Result at 120kbps
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
VCC = +3.3V, 235kbps
C1–C4 = 0.1μF
2μs/div
Figure 10. Loopback Test Result at 235kbps
www.maximintegrated.com
Maxim Integrated | 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX3221.PDF ] | |
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