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MAX3238EEAI+T

P1-P3P4-P6P7-P9P10-P12
_______________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 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
CC
completely removed.
The MAX3238 is available in a space-saving SSOP
package.
________________________Applications
Notebook, Subnotebook, and Palmtop
Computers
High-Speed Modems
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
AutoShutdown Plus
i
s a trademark of Maxim Integrated Products.
*P
____________________________Features
♦ 1µA Supply Current Achieved with
AutoShutdown Plus
♦ Guaranteed Data Rate: 250kbps
♦ 1µA Low-Power Shutdown
♦ Receivers Active in AutoShutdown Plus Mode
♦ Flow-Through Pinout
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed 6V/µs Slew Rate
MAX3238
+3.0V to +5.5V, 1µA, up to 250kbps, True
RS-232 Transceiver with AutoShutdown Plus
________________________________________________________________ Maxim Integrated Products 1
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
MAX3238
__________________Pin Configuration
19-1144; Rev 1; 10/02
PART
MAX3238CAI
MAX3238EAI -40°C to +85°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
28 SSOP
28 SSOP
______________Ordering Information
Typical Operating Circuit appears at end of data sheet.
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.
MAX3238
+3.0V to +5.5V, 1µA, up to 250kbps, True
RS-232 Transceiver with AutoShutdown Plus
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.)
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.
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)
SSOP (derate 9.52mW/°C above +70°C) ....................762mW
Operating Temperature Ranges
MAX3238CAI ......................................................0°C to +70°C
MAX3238EAI....................................................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10s) ................................+300°C
FORCEOFF = GND, T
A
= +25°C
V
CC
= 3.3V or 5.0V, T
A
= +25°C, receivers idle,
transmitters idle, FORCEON = GND,
FORCEOFF = V
CC
I
OUT
= -1.0mA
I
OUT
= 1.6mA
Receivers disabled
T_IN, FORCEON, FORCEOFF
FORCEON = FORCEOFF = V
CC
, no load
T_IN, FORCEON, FORCEOFF
V
CC
= 3.3V
CONDITIONS
µA
1.0 10
Supply Current, Shutdown
µA
1.0 10
Supply Current, AutoShutdown Plus
V
V
CC
-V
CC
-
0.6 0.1
Output Voltage High
V0.4Output Voltage Low
µA±0.05 ±10Output Leakage Current
µA±0.01 ±1.0Input Leakage Current
mA0.5 2.0
Supply Current, AutoShutdown Plus
Disabled
V0.8Input Logic Threshold Low
V
2.0
Input Logic Threshold High
UNITSMIN TYP MAXPARAMETER
Note 1: V+ and V- can have a maximum magnitude of +7V, but their absolute difference can not exceed +13V.
V
CC
= 5.0V 2.4
V-25 25Input Voltage Range
V
CC
= 3.3V 0.6 1.2
V
CC
= 5.0V
V
0.8 1.5
Input Threshold Low
V
CC
= 3.3V 1.5 2.4
V
CC
= 5.0V
V
1.8 2.4
Input Threshold High
V0.3Input Hysteresis
T
A
= +25°C kΩ357Input Resistance
DC CHARACTERISTICS
LOGIC INPUTS AND RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3238
+3.0V to +5.5V, 1µA, up to 250kbps, True
RS-232 Transceiver with AutoShutdown Plus
_______________________________________________________________________________________ 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 7a
Figure 4b (Note 2)
V
CC
= 5V, Figure 4b (Note 2)
V
CC
= 5V, Figure 4b
I
OUT
= 1.6mA
I
OUT
= -1.0mA
V
CC
= 5V, Figure 4b
CONDITIONS
V-0.3 0.3
Receiver Input Threshold to
INVALID Output Low
V
2.7
Receiver Input Threshold to
INVALID Output High
sec15 30 60
Receiver or Transmitter Edge to
Shutdown (t
AUTOSHDN
)
µs25
Receiver or Transmitter Edge to
Transmitters Enabled (t
WU
)
µs50
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
µs0.1
Receiver Positive or Negative
Threshold to INVALID High (t
INVH
)
UNITSMIN TYP MAXPARAMETER
Positive threshold
Negative threshold -2.7
Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±5.4 V
Output Resistance V
CC
= V+ = V- = GND, T
OUT
= 2V 300 10M Ω
V
CC
≤ 3.6V ±35 ±60
Output Leakage Current
V
OUT
= ±12V, V
CC
= 0V to 5.5V,
transmitters disabled
±25 µA
| t
PHL
- t
PLH
|
430
t
PHL
R_IN to R_OUT,
C
L
= 150pF
t
PLH
C
L
= 150pF to 1000pF
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching
C
L
= 150pF to 2500pF
0.15
V
CC
= 3.3V,
T
A
= +25°C,
R
L
= 3Ω to 7kΩ,
measured from +3V to
-3V or -3V to +3V
Normal operation
Normal operation
| t
PHL
- t
PLH
|
µs
0.15
Receiver Propagation Delay
kbps250Maximum Data Rate
V/µs
630
Transition-Region Slew Rate
ns200Receiver Output Enable Time
ns200Receiver Output Disable Time
ns100Transmitter Skew
ns50Receiver Skew
TIMING CHARACTERISTICS
Output Short-Circuit Current
V
CC
> 3.6V ±40 ±100
AutoShutdown (FORCEON = GND, FORCEOFF = V
CC
)
TRANSMITTER OUTPUTS
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
mA
P1-P3P4-P6P7-P9P10-P12

MAX3238EEAI+T

Mfr. #:
Buy MAX3238EEAI+T
Manufacturer:
Maxim Integrated
Description:
RS-232 Interface IC 3-5.5V 250kbps Transceiver
Lifecycle:
New from this manufacturer.
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