MAX3238EAI 반도체 회로 부품 판매점
+3.0V to +5.5V / 1A / up to 250kbps / True RS-232 Transceiver with AutoShutdown Plus
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 Maxim Integrated |
19-1144; Rev 0; 9/96
+3.0V to +5.5V, 1µA, up to 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
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 VCC 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
Typical Operating Circuit appears at end of data sheet.
AutoShutdown Plus is a trademark of Maxim Integrated Products.
*Patents Pending
____________________________Features
o 1µA Supply Current Achieved with
AutoShutdown Plus
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
PART
MAX3238CAI
MAX3238EAI
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
__________________Pin Configuration
TOP VIEW
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
FORCEON 13
FORCEOFF 14
MAX3238
SSOP
28 C1+
27 V+
26 VCC
25 C1-
24 T1IN
23 T2IN
22 T3IN
21 R1OUT
20 R2OUT
19 T4IN
18 R3OUT
17 T5IN
16 R1OUTB
15 INVALID
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
+3.0V to +5.5V, 1µA, up to 250kbps, True
RS-232 Transceiver with AutoShutdown Plus™
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-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 (VCC + 0.3V)
Short-Circuit Duration
T_OUT (one at a time) ............................................Continuous
Continuous Power Dissipation (TA = +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, 10sec) ............................+300°C
Note 1: V+ and V- can have a maximum magnitude of +7V, but their absolute difference can not exceed +13V.
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.
ELECTRICAL CHARACTERISTICS
(VCC = +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%); TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
DC CHARACTERISTICS
Supply Current, AutoShutdown Plus
Supply Current, Shutdown
CONDITIONS
VCC = 3.3V or 5.0V, TA = +25°C, receivers idle,
transmitters idle, FORCEON = GND,
FORCEOFF = VCC
FORCEOFF = GND, TA = +25°C
MIN TYP MAX UNITS
1.0 10 µA
1.0 10 µA
Supply Current, AutoShutdown Plus
Disabled
FORCEON = FORCEOFF = VCC, no load
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
T_IN, FORCEON, FORCEOFF
Input Logic Threshold High
Input Leakage Current
VCC = 3.3V
VCC = 5.0V
T_IN, FORCEON, FORCEOFF
Output Leakage Current
Receivers disabled
Output Voltage Low
IOUT = 1.6mA
Output Voltage High
IOUT = -1.0mA
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
VCC = 3.3V
VCC = 5.0V
VCC = 3.3V
VCC = 5.0V
TA = +25°C
0.5 2.0 mA
2.0
2.4
±0.01
±0.05
VCC -
0.6
VCC -
0.1
0.8
±1.0
±10
0.4
-25 25
0.6 1.2
0.8 1.5
1.5 2.4
1.8 2.4
0.3
357
V
V
µA
µA
V
V
V
V
V
V
kΩ
2 _______________________________________________________________________________________
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MAX3238EAI transceiver
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MAX3238EAI
+3.0V to +5.5V / 1A / up to 250kbps / True RS-232 Transceiver with AutoShutdown Plus - Maxim Integrated
