MAX3238CAIT Maxim Integrated Products, Inc., MAX3238CAIT Datasheet

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MAX3238CAIT

Manufacturer Part Number
MAX3238CAIT
Description
Max3238 +3.0v To +5.5v, 1?a, Up To 250kbps, True Rs-232 Transceiver With Autoshutdown Plus
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
The MAX3238 true RS-232 transceiver achieves a
1µA supply current with Maxim’s revolutionary
AutoShutdown Plus™ feature. When the device does
not sense a valid signal transition on either the receiver
or transmitter inputs within 30sec, the on-board power
supply and drivers shut down. This occurs if the RS-232
cable is disconnected or if the transmitters of the con-
nected peripheral are inactive. The system turns on
again when a valid transition is applied to any RS-232
receiver or transmitter input, saving power without
changes to the existing BIOS or operating system.
The MAX3238 5-driver/3-receiver complete serial port is
a 3V-powered EIA/TIA-232 and V.28/V.24 communica-
tions interface intended for notebook or subnotebook
computer applications. A proprietary, high-efficiency,
dual charge-pump power supply and a low-dropout
transmitter combine to deliver true RS-232 performance
from a single +3.0V to +5.5V supply. A guaranteed
data rate of 250kbps provides compatibility with popu-
lar software for communicating with personal comput-
ers. The MAX3238 requires only 0.1µF capacitors in
3.3V operation. It is ideal for 3.3V-only systems, mixed
3.3V and 5.0V systems, or 5V-only systems that require
true RS-232 performance.
Receiver R1 has an extra, always-active output (in addi-
tion to its standard output), which allows external
devices, such as a modem, to be monitored without for-
ward biasing the protection diodes in circuitry that may
have V
The MAX3238 is available in a space-saving SSOP
package.
Typical Operating Circuit appears at end of data sheet.
AutoShutdown Plus is a trademark of Maxim Integrated Products.
*Patents Pending
________________________Applications
19-1144; Rev 1; 10/02
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.
_______________General Description
Notebook, Subnotebook, and Palmtop
Computers
High-Speed Modems
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
CC
RS-232 Transceiver with AutoShutdown Plus
completely removed.
+3.0V to +5.5V, 1µA, up to 250kbps, True
________________________________________________________________ Maxim Integrated Products
____________________________Features
o 1µA Supply Current Achieved with
o Guaranteed Data Rate: 250kbps
o 1µA Low-Power Shutdown
o Receivers Active in AutoShutdown Plus Mode
o Flow-Through Pinout
o Meets EIA/TIA-232 Specifications Down to 3.0V
o Guaranteed 6V/µs Slew Rate
______________Ordering Information
__________________Pin Configuration
MAX3238CAI
MAX3238EAI
AutoShutdown Plus
TOP VIEW
PART
FORCEOFF
FORCEON
T1OUT
T2OUT
T3OUT
T4OUT
T5OUT
GND
R1IN
R2IN
R3IN
C2+
C2-
V-
TEMP RANGE
-40°C to +85°C
10
11
12
13
14
1
2
3
4
5
6
7
8
9
0°C to +70°C
MAX3238
SSOP
25
24
23
19
18
17
16
15
28
27
26
22
21
20
28 SSOP
28 SSOP
PIN-PACKAGE
R3OUT
R1OUTB
INVALID
C1+
V+
V
C1-
T1IN
T2IN
T3IN
R1OUT
R2OUT
T4IN
T5IN
CC
1

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MAX3238CAIT Summary of contents

Page 1

Rev 1; 10/02 +3.0V to +5.5V, 1µ 250kbps, True RS-232 Transceiver with AutoShutdown Plus _______________General Description The MAX3238 true RS-232 transceiver achieves a 1µA supply current with Maxim’s revolutionary AutoShutdown Plus™ feature. When the device does not ...

Page 2

True RS-232 Transceiver with AutoShutdown Plus ABSOLUTE MAXIMUM RATINGS V ...........................................................................-0. (Note 1) ...............................................................-0.3V to +7V V- (Note 1) ................................................................+0. |V-| (Note 1) .................................................................+13V Input ...

Page 3

True RS-232 Transceiver with AutoShutdown Plus ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V; C1–C4 = 0.1µF (tested at 3.3V ±5%), C1–C4 = 0.22µF (tested at 3.3V ±10%), C1 = 0.047µF and CC ...

Page 4

True RS-232 Transceiver with AutoShutdown Plus __________________________________________Typical Operating Characteristics (V = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 7.5 V ...

Page 5

True RS-232 Transceiver with AutoShutdown Plus Table 1. Output Control Truth Table AUTOSHUTDOWN FORCEON ...

Page 6

True RS-232 Transceiver with AutoShutdown Plus POWER FORCEOFF MANAGEMENT FORCEON UNIT OR KEYBOARD INVALID CONTROLLER MAX3238 I/O T4 CPU CHIP WITH UART T5 Figure 1. Interface Under Control of PMU ...

Page 7

True RS-232 Transceiver with AutoShutdown Plus Table Truth Table RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT Yes No ...

Page 8

True RS-232 Transceiver with AutoShutdown Plus INVALID HIGH +2.7V INDETERMINATE +0.3V 0V INVALID LOW -0.3V INDETERMINATE -2.7V INVALID HIGH Figure 4a. Receiver Positive/Negative Thresholds for INVALID INVALID REGION * ** RECEIVER INPUTS VOLTAGE ...

Page 9

True RS-232 Transceiver with AutoShutdown Plus Power-Supply Decoupling In applications that are sensitive to power-supply noise, decouple V to ground with a capacitor of the same CC value as capacitors C2, C3, and ...

Page 10

True RS-232 Transceiver with AutoShutdown Plus T1IN T1OUT R1OUT V = 3.3V 2 s/div 0 1000pF LOAD Figure 7. Loopback Test Result at 120kbps 10 ...

Page 11

True RS-232 Transceiver with AutoShutdown Plus __________Typical Operating Circuit 0 C1+ 0 C1- MAX3238 1 C2+ 0 C2- 24 T1IN T1 23 T2IN T2 ...

Page 12

True RS-232 Transceiver with AutoShutdown Plus (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ...

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