MAX3248EEAI-T Maxim Integrated, MAX3248EEAI-T Datasheet

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MAX3248EEAI-T

Manufacturer Part Number
MAX3248EEAI-T
Description
RS-232 Interface IC
Manufacturer
Maxim Integrated
Series
MAX3238E, MAX3248Er
Datasheet
The MAX3238E/MAX3248E transceivers use Maxim’s
revolutionary AutoShutdown Plus™ feature to achieve
10nA supply current. These devices shut down the on-
board power supply and drivers when they do not sense
a valid signal transition on either the receiver or transmit-
ter inputs. This occurs if the RS-232 cable is disconnect-
ed or if the transmitters of the connected peripheral are
turned off. The devices turn on again when a valid transi-
tion is applied to any RS-232 receiver or transmitter input.
AutoShutdown Plus automatically achieves this power
savings through its on-board circuitry, as no changes are
required to the existing BIOS or operating system.
All RS-232 inputs and outputs, as well as the logic I/O
pins, have enhanced ESD protection to ±15kV. The addi-
tional ESD protection on the logic I/O pins makes the
MAX3238E/MAX3248E ideal for cell phone data cable
applications because it eliminates the need for costly
external TransZorb ™ or protection schemes.
The MAX3238E/MAX3248E contain five drivers and three
receivers and are 3V-powered EIA/TIA-232 and V.28/V.24
communication interfaces intended for cell phones, data
cables, and modem applications. A proprietary, high-effi-
ciency, 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 popular software for communicating with personal
computers.
The MAX3238E and the MAX3248E differ only in their
input logic thresholds. The MAX3238E has standard logic
thresholds, while the MAX3248E has low-level logic
thresholds of 0.6V to 1.2V, which are ideal for 1.8V sys-
tems.
The transmitter inputs, FORCEON, and FORCEOFF have
a 400kΩ active positive feedback resistor. Once driven to
a valid logic level, they will retain this level if the driving
signal is removed or goes high impedance. Unused
transmitter and logic inputs may be left unconnected. The
MAX3238E/MAX3248E can operate with supply voltages
ranging from +3.0V to +5.5V.
AutoShutdown Plus is a trademark of Maxim Integrated Products.
TransZorb is a trademark of General Semiconductor Industries, Inc.
4,r
pg.
19-1632; Rev 1; 6/01
Cellular Data Cables
Modems
Battery-Powered Equipment
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.
C4;
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
________________________________________________________________ Maxim Integrated Products
General Description
Peripherals
Data Cradles
Printers
Applications
o Enhanced ESD Protection on RS-232 I/O Pins and
o Guaranteed Data Rate: 250kbps
o 10nA Low-Power Shutdown with Receivers Active
o Schmitt Triggers on All Inputs
o Flow-Through Pinout
o Meets EIA/TIA-232 Specifications Down to 3.0V
o Guaranteed 6V/µs Slew Rate
o Low-Level Logic Thresholds (MAX3248E)
o RS-232-Compatible Outputs to 2.7V
___________________Pin Configuration
Typical Operating Circuit appears at end of data sheet.
MAX3238ECAI
MAX3238EEAI
MAX3248ECAI
MAX3248EEAI
All Logic Pins
TOP VIEW
±15kV—Human Body Model
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—IEC 1000-4-2 Air-Gap Discharge
PART
FORCEOFF
FORCEON
T1OUT
T2OUT
T3OUT
T4OUT
T5OUT
GND
R1IN
R2IN
R3IN
C2+
C2-
V-
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
10
11
12
13
14
1
2
3
4
5
6
7
8
9
0°C to +70°C
0°C to +70°C
Ordering Information
MAX3238E
MAX3248E
SSOP
15
28
27
26
25
24
23
22
21
20
19
18
17
16
R3OUT
R1OUTB
INVALID
28 SSOP
28 SSOP
28 SSOP
28 SSOP
C1+
V+
V
C1-
T1IN
T2IN
T3IN
R1OUT
R2OUT
T4IN
T5IN
PIN-PACKAGE
CC
Features
1

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MAX3248EEAI-T Summary of contents

Page 1

... Low-Level Logic Thresholds (MAX3248E) o RS-232-Compatible Outputs to 2.7V Ordering Information PART TEMP. RANGE MAX3238ECAI 0°C to +70°C MAX3238EEAI -40°C to +85°C MAX3248ECAI 0°C to +70°C MAX3248EEAI -40°C to +85°C Typical Operating Circuit appears at end of data sheet. ___________________Pin Configuration TOP VIEW C2 GND 2 27 ...

Page 2

... Short-Circuit Duration T_OUT (one at a time) ............................................Continuous Continuous Power Dissipation (T 28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW Operating Temperature Ranges MAX3238ECAI/MAX3248ECAI ...........................0°C to +70°C MAX3238EEAI/MAX3248EEAI .........................-40°C to +85°C Storage Temperature Range ............................-65°C to +150°C Lead Temperature (soldering, 10s) ................................+300°C + 0.3V unless otherwise noted ...

Page 3

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins 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 ...

Page 4

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins 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 ...

Page 5

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins (V = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ TRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE ...

Page 6

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Table 1. Output Control Truth Table AutoShutdown FORCEOFF FORCEON Don’t care *Time since last receiver or ...

Page 7

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins POWER FORCEOFF MANAGEMENT FORCEON UNIT OR KEYBOARD INVALID CONTROLLER MAX3238E/ MAX3248E I/O CHIP CPU WITH UART Figure 1. Interface Under Control of PMU AutoShutdown Plus Mode ...

Page 8

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Table 2. INVALID Truth Table RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT Yes No Tables 1 and 2 and Figure 3 summarize the MAX3238E/ MAX2348Es’ operating ...

Page 9

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins 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 est, which is then discharged into ...

Page 10

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins R 1MΩ R 1500Ω DISCHARGE CHARGE-CURRENT RESISTANCE LIMIT RESISTOR HIGH STORAGE VOLTAGE 100pF CAPACITOR DC SOURCE Figure 5a. Human Body ESD Test ...

Page 11

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins 5V/div 2V/div 4µs/div V = 3.3V, C1–C4 = 0.1µ 3kΩ LOAD Figure 7. Transmitter Outputs when Recovering from Shutdown or Powering Up ...

Page 12

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins + C1 0.1µF C3 0.1µF TVS C5 0.1µF SUB- MINIATURE CONNECTOR Figure 11. Data Cable Application Example 12 ______________________________________________________________________________________ 28 C1+ 25 C1- MAX3238E MAX3248E 27 ...

Page 13

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Typical Operating Circuit +3.3V 1µ C1+ 0.1µF 25 C1- MAX3238E MAX3248E 1 C2+ 0.1µF 3 C2- 24 T1IN T1 23 T2IN T2 ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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