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MAX3248EEAI

P1-P3P4-P6P7-P9P10-P12P13-P14
________________________________________________________________ Maxim Integrated Products 1
General Description
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.
Applications
Features
♦ Enhanced ESD Protection on RS-232 I/O Pins and
All Logic Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—IEC 1000-4-2 Air-Gap Discharge
♦ Guaranteed Data Rate: 250kbps
♦ 10nA Low-Power Shutdown with Receivers Active
♦ Schmitt Triggers on All Inputs
♦ Flow-Through Pinout
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed 6V/µs Slew Rate
♦ Low-Level Logic Thresholds (MAX3248E)
♦ RS-232-Compatible Outputs to 2.7V
MAX3238E/MAX3248E
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C1+
V+
V
CC
C1-
T1IN
T2IN
INVALID
T3IN
R1OUT
R2OUT
T4IN
R3OUT
T5IN
R1OUTB
FORCEOFF
FORCEON
T5OUT
R3IN
T4OUT
R2IN
R1IN
T3OUT
T2OUT
T1OUT
V-
C2-
GND
C2+
SSOP
TOP VIEW
MAX3238E
MAX3248E
___________________Pin Configuration
19-1632; Rev 1; 6/01
Ordering Information
AutoShutdown Plus
i
s a trademark of Maxim Integrated Products.
TransZorb is a trademark of General Semiconductor Industries, Inc.
†
C4;
4,r
pg.
Cellular Data Cables
Modems
Battery-Powered Equipment
Peripherals
Data Cradles
Printers
Typical Operating Circuit appears at end of data sheet.
28 SSOP
28 SSOP
28 SSOP
28 SSOP
PIN-PACKAGETEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°CMAX3248EEAI
MAX3248ECAI
MAX3238EEAI
MAX3238ECAI
PART
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.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
MAX3238E/MAX3248E
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +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
C2–C4 = 0.33µF (tested at 5.0V ±10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
V
CC
...........................................................................-0.3V to +6V
V+ (Note 1) ...............................................................-0.3V to +7V
V- (Note 1) ................................................................+0.3V to -7V
V+ + |V-| (Note 1) .................................................................+13V
Input Voltages
T_IN, FORCEOFF, FORCEON ..............................-0.3V to +6V
R_IN .................................................................................±25V
Output Voltages
T_OUT...........................................................................±13.2V
R_OUT, INVALID ....................................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration
T_OUT (one at a time) ............................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
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
Note 1: V+ and V- can have a maximum magnitude of +7V, but their absolute difference can not exceed +13V.
1.10 1.2
1.15 1.6
0.95 1.2
MAX3248E
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 5.0V
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 3.3V
T_IN (active)
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 5.0V
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 3.3V
T_IN (active)
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 5.0V
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 3.3V
T_IN (active)
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 5.0V
FORCEON, FORCEOFF, and T_IN
wake-up threshold; V
CC
= 3.3V
T_IN (active)
PARAMETER MIN TYP MAX UNITS
Input Logic Threshold Low
0.8 1.20
V
Supply Current, AutoShutdown Plus
Disabled
0.5 2.0 mA
Supply Current, AutoShutdown Plus
Input Logic Threshold High
1.60 2.0
0.75 6 µA
V
10 300
2.10 2.4
1.30 2.0
MAX3238E
0.6 0.7
0.8 1.45
0.6 1.0
0.6 0.85
0.8 1.00
MAX3248E
Supply Current, Shutdown 10 300 nA
CONDITIONS
FORCEOFF = GND, R_IN = GND, T_IN = V
CC
or GND
MAX3238E
FORCEON = FORCEOFF = V
CC
, no load
Receivers idle, T_IN = V
CC
or GND, FORCEON =
GND, FORCEOFF = V
CC
R_IN = FORCEON = GND, FORCEOFF = V
CC,
T_IN = V
CC
or GND
nA
DC CHARACTERISTICS (V
CC
= +3.3V or +5.0V, T
A
= +25°C)
LOGIC INPUTS AND RECEIVER OUTPUTS
MAX3238E/MAX3248E
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +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
C2–C4 = 0.33µF (tested at 5.0V ±10%), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
Figure 4a
Figure 4a
Figure 4b
V
CC
= 5V, Figure 4b (Note 3)
V
CC
= 5V, Figure 4b
I
OUT
= 1.0mA
I
OUT
= -1.0mA
V
CC
= 5V, Figure 4b
V-0.3 0.3
Receiver Input Threshold to
INVALID Output Low
V
2.7
Receiver Input Threshold to
INVALID Output High
s15 30 60
Receiver or Transmitter Edge to
Shutdown (t
AUTOSHDN
)
µs25
Receiver or Transmitter Edge to
Transmitters Enabled (t
WU
)
µs60
Receiver Positive or Negative
Threshold to INVALID Low (t
INVL
)
V0.4
INVALID Output Voltage Low
V
V
CC -
0.6
INVALID Output Voltage High
µs0.3
Receiver Positive or Negative
Threshold to INVALID High (t
INVH
)
Positive threshold
Negative threshold -2.7
V-25 25
I
OUT
= -1.0mA
I
OUT
= 1.0mA
Input Voltage Range
V
CC
= 3.3V
Receivers disabled
T_IN, FORCEON, FORCEOFF (Note 2)
0.6 1.0
CONDITIONS
V
CC
= 5.0V
V
0.8 1.4
Input Threshold Low
V
CC
= 3.3V 1.5 2.4
V
CC
= 5.0V
V
2.0 2.4
Input Threshold High
V0.6Input Hysteresis
T
A
= +25°C kΩ357Input Resistance
V
V
CC
-V
CC
-
0.6 0.1
Output Voltage High
V0.4Output Voltage Low
µA±0.05 ±10Output Leakage Current
µA918Input Leakage Current
UNITSMIN TYP MAXPARAMETER
All transmitter outputs loaded with 3kΩ to ground V±5.0 ±5.4Output Voltage Swing
V
CC
= 0, T
OUT
= ±2V Ω300 50kOutput Resistance
V
CC
≤ 3.6V ±35 ±60
V
CC
> 3.6V
mA
±40 ±100
Output Short-Circuit Current
IEC 1000-4-2 Air-Gap Discharge Method ±15
IEC 1000-4-2 Contact Discharge Method ±8
Human Body Model
kV
±15
ESD Protection (R_IN, T_IN, R_OUT,
T_OUT, FORCEON, FORCEOFF,
INVALID, R_OUTB)
RECEIVER INPUTS
AutoShutdown (FORCEON = GND, FORCEOFF = V
CC
)
TRANSMITTER OUTPUTS
ESD PROTECTION
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX3248EEAI

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IC TXRX RS232 250KBPS 28-SSOP
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