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MAX203E Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer MAX203E
Beschreibung 5V RS-232 Transceivers
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 25 Seiten
MAX203E Datasheet, Funktion
MAX202E–MAX213E,
MAX232E/MAX241E
EVALUATION KIT AVAILABLE
±15kV ESD-Protected,
5V RS-232 Transceivers
General Description
The MAX202E-MAX213E, MAX232E, and MAX241E are a
family of RS-232 and V.28 transceivers with high ±15kV
ESD HBM protection and integrated charge pump circuit-
ry for single +5V supply operation. The various combina-
tions of features are outlined in the Selector Guide. The
drivers and receivers for all ten devices meet all EIA/TIA-
232E and CCITT V.28 specifications at data rates up to
120kbps when loaded.
The MAX211E/MAX213E/MAX241E are available in 28-
pin SO and SSOP packages. The MAX202E/MAX232E
come in 16-pin TSSOP, narrow SO, wide SO, and DIP
packages. The MAX203E comes in a 20-pin DIP/SO
package, and needs no external charge-pump capaci-
tors. The MAX205E comes in a 24-pin wide DIP pack-
age, and also eliminates external charge-pump
capacitors.
Applications
Battery-Powered Equipment
Hand-Held Equipment
Portable Diagnostics Equipment
Benefits and Features
Saves Board Space
Integrated High ±15kV HBM ESD Protection
Integrated Charge Pump Circuitry
Eliminates the Need for a Bipolar ±12V Supply
Enables Single Supply Operation From +5V Supply
Integrated 0.1µF Capacitors (MAX203E, MAX205E)
24 pin SSOP Package Saves up to 40% Versus SO
Package
Saves Power for Reduced Power Requirements
1µA Shutdown Mode
15µA Shutdown Mode for MAX213E
Ordering Information
PART
MAX202ECPE
MAX202ECSE
TEMP RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Ordering Information continued at end of data sheet.
Pin Configurations and Typical Operating Circuits appear at
end of data sheet.
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
PART
MAX202E
MAX203E
MAX205E
MAX206E
MAX207E
MAX208E
MAX211E
MAX213E
MAX232E
MAX241E
NO. OF RS-232 NO. OF RS-232
DRIVERS
RECEIVERS
22
22
55
43
53
44
45
45
22
45
RECEIVERS
ACTIVE IN
SHUTDOWN
0
0
0
0
0
0
0
2
0
0
NO. OF
EXTERNAL
CAPACITORS
(µF)
4 (0.1)
None
None
4 (0.1)
4 (0.1)
4 (0.1)
4 (0.1)
4 (0.1)
4 (1)
4 (1)
LOW-POWER
SHUTDOWN
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
TTL TRI-
STATE
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
19-0175; Rev 7; 1/15






MAX203E Datasheet, Funktion
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
Pin Descriptions
MAX202E/MAX232E
PIN
DIP/SO/TSSOP
LCC
1, 3 2, 4
23
4, 5 5, 7
68
7, 14
9, 18
8, 13
10, 17
9, 12
12, 15
10, 11
13, 14
15 19
16 20
__ 1, 6, 11, 16
NAME
C1+, C1-
V+
C2+, C2-
V-
T_OUT
R_IN
R_OUT
T_IN
GND
VCC
N.C.
FUNCTION
Terminals for Positive Charge-Pump Capacitor
+2VCC Voltage Generated by the Charge Pump
Terminals for Negative Charge-Pump Capacitor
-2VCC Voltage Generated by the Charge Pump
RS-232 Driver Outputs
RS-232 Receiver Inputs
RS-232 Receiver Outputs
RS-232 Driver Inputs
Ground
+4.5V to +5.5V Supply-Voltage Input
No Connection—Not Internally Connected
MAX203E
PIN
DIP SO
1, 2 1, 2
3, 20
3, 20
4,19 4, 19
5,18 5, 18
6, 9 6, 9
77
8 13
10, 16
11, 16
12, 17
10, 17
13 14
14 8
11, 15
12, 15
NAME
T_IN
R_OUT
R_IN
T_OUT
GND
VCC
C1+
C2-
V-
C1-
V+
C2+
FUNCTION
RS-232 Driver Inputs
RS-232 Receiver Outputs
RS-232 Receiver Inputs
RS-232 Transmitter Outputs
Ground
+4.5V to +5.5V Supply-Voltage Input
Make no connection to this pin.
Connect pins together.
-2VCC Voltage Generated by the Charge Pump. Connect pins together.
Make no connection to this pin.
+2VCC Voltage Generated by the Charge Pump
Connect pins together.
MAX205E
PIN
1–4, 19
5, 10, 13, 18, 24
6, 9, 14, 17, 23
7, 8, 15, 16, 22
11
12
20
21
NAME
T_OUT
R_IN
R_OUT
T_IN
GND
VCC
EN
SHDN
RS-232 Driver Outputs
FUNCTION
RS-232 Receiver Inputs
TTL/CMOS Receiver Outputs. All receivers are inactive in shutdown.
TTL/CMOS Driver Inputs. Internal pullups to VCC.
Ground
+4.75V to +5.25V Supply Voltage
Receiver Enable—Active Low
Shutdown Control—Active High
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MAX203E pdf, datenblatt
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
RC 1MΩ
CHARGE-CURRENT-
LIMIT RESISTOR
RD 1500Ω
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
Figure 6a. Human Body ESD Test Model
RC 50MΩ to 100MΩ
RD 330Ω
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
DEVICE
UNDER
TEST
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
I
100%
90%
Figure 7a. IEC1000-4-2 ESD Test Model
est, which is then discharged into the test device
through a 1.5kΩ resistor.
IEC1000-4-2
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The
MAX202E/MAX203E–MAX213E, MAX232E/MAX241E
help you design equipment that meets level 4 (the high-
est level) of IEC1000-4-2, without the need for addition-
al 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
10%
tr = 0.7ns to 1ns
30ns
60ns
t
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
Model. Figure 7b shows the current waveform for the
8kV IEC1000-4-2 level-four ESD contact-discharge test.
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method con-
nects the probe to the device before the probe is ener-
gized.
Machine Model
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and
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