IC TXRX RS232 DUAL 250KBPS 20DIP

MAX3235ECPP

Manufacturer Part NumberMAX3235ECPP
DescriptionIC TXRX RS232 DUAL 250KBPS 20DIP
ManufacturerMaxim Integrated Products
TypeTransceiver
MAX3235ECPP datasheet
 


Specifications of MAX3235ECPP

Number Of Drivers/receivers2/2ProtocolRS232
Voltage - Supply4.5 V ~ 5.5 VMounting TypeThrough Hole
Package / Case20-DIP (0.300", 7.62mm)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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19-1473; Rev 2; 8/04
±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors
________________General Description
The MAX3233E/MAX3235E are EIA/TIA-232 and V.28/V.24
communications interfaces with automatic shutdown/
wake-up 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 MAX3233E operates
from a +3.3V supply; the MAX3235E operates from +5.0V.
All devices achieve a 1µA supply current using Maxim’s
revolutionary AutoShutdown Plus™ feature. These
devices automatically enter a low-power shutdown
mode when the following two conditions occur: either
the RS-232 cable is disconnected or the transmitters of
the connected peripherals are inactive, and the UART
driving the transmitter inputs is inactive for more than
30 seconds. They turn on again when they sense a
valid transition at any transmitter or receiver input.
AutoShutdown Plus saves power without changes to
the existing BIOS or operating system.
The MAX3233E/MAX3235E have internal dual charge
pumps requiring no external capacitors. Both trans-
ceivers have a proprietary low-dropout transmitter out-
put stage that enables true RS-232 performance from a
+3.0V to +3.6V supply for the MAX3233E or a +4.5V to
+5.5V supply for the MAX3235E. These devices are
guaranteed to operate up to 250kbps. Both are avail-
able in space-saving 20-pin wide SO or plastic DIP
packages.
________________________Applications
Subnotebook and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Handheld Equipment
Peripherals
Embedded Systems
_______________Ordering Information
PART
TEMP RANGE
MAX3233ECWP
0°C to +70°C
MAX3233ECPP
0°C to +70°C
MAX3233EEWP
-40°C to +85°C
MAX3233EEPP
-40°C to +85°C
Ordering Information continued at end of data sheet.
AutoShutdown Plus is a trademark of Maxim Integrated Products, Inc.
Co7;
4,7er
pg.
________________________________________________________________ Maxim Integrated Products
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.
____________________________Features
♦ ESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
♦ Latchup Free
♦ 1µA Supply Current
♦ AutoShutdown Plus—1997 EDN Magazine
Innovation of the Year
♦ Single-Supply Operation
+3.0V to +3.6V (MAX3233E)
+4.5V to +5.5V (MAX3235E)
♦ 250kbps Guaranteed Data Rate
♦ 6V/µs Guaranteed Slew Rate
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
(MAX3233E)
♦ Internal Charge-Pump Capacitors
R2OUT
INVALID
T2IN
T1IN
FORCEON
R1OUT
T1OUT
R1IN
PIN-PACKAGE
V
CC
20 SO
20 Plastic DIP
FORCEOFF
20 SO
20 Plastic DIP
Typical Operating Circuit appears at end of data sheet.
Pin Configuration/
Functional Diagram
1
20
MAX3233E
MAX3235E
2
19
3
18
4
17
5
16
6
15
CHARGE
PUMP
7
14
13
8
9
12
10
11
SO/DIP
R2IN
T2OUT
GND
V-
C2-
C2+
C1-
C1+
V+
V+
1

MAX3235ECPP Summary of contents

  • Page 1

    ... MAX3233EEWP -40°C to +85°C MAX3233EEPP -40°C to +85°C Ordering Information continued at end of data sheet. AutoShutdown Plus is a trademark of Maxim Integrated Products, Inc. † Co7; 4,7er pg. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’ ...

  • Page 2

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors ABSOLUTE MAXIMUM RATINGS V to GND (MAX3233E).........................................-0. GND (MAX3235E).........................................-0. GND (Note 1) ..................................................-0. GND (Note ...

  • Page 3

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors ELECTRICAL CHARACTERISTICS (continued +3.0V to +3.6V for MAX3233E ues are +25°C.) A PARAMETER SYMBOL TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output ...

  • Page 4

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors TIMING CHARACTERISTICS (V = +3.0V to +3.6V for MAX3233E ues are +25°C.) A PARAMETER SYMBOL Maximum Data Rate t PHL Receiver Propagation Delay t ...

  • Page 5

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors ______________________________________________________________Pin Description PIN NAME 1 R2OUT 6 R1OUT INVALID 2 3 T2IN 4 T1IN 5 FORCEON 7 T1OUT 19 T2OUT 8 R1IN 20 R2IN FORCEOFF 10 ...

  • Page 6

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3233E/MAX3235E’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V ...

  • Page 7

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors Table 1. Output Control Truth Table OPERATION STATUS FORCEON Shutdown (Forced Off) Normal Operation (Forced On) Normal Operation (AutoShutdown Plus) Shutdown (AutoShutdown Plus) INVALID* Normal Operation INVALID* Normal Operation ...

  • Page 8

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors By connecting FORCEON to INVALID, the device shuts down when no valid receiver level and no receiver or transmitter edge is detected for 30sec. It wakes up when a ...

  • Page 9

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors POWER- MASTER SHDN LINE MANAGEMENT 0.1µF UNIT FORCEOFF MAX3233E MAX3235E Figure 4. AutoShutdown Plus Initial Turn-On to Wake Up Another System R 1MΩ R 1500Ω DISCHARGE CHARGE-CURRENT ...

  • Page 10

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors I 100% 90% 10 0.7ns to 1ns 30ns 60ns Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform 5V/div 0 FORCEON = FORCEOFF 2V/div ...

  • Page 11

    ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors Each transmitter is loaded with 3kΩ in parallel with 1000pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters ...

  • Page 12

    ... Maxim reserves the right to change the circuitry and specifications without notice at any time. ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 12 © 2004 Maxim Integrated Products Ordering Information (continued) PART MAX3235ECWP 11, 12 MAX3235ECPP V+ MAX3235EEWP MAX3235EEPP 17 V- ___________________Chip Information T1OUT ...