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MAX218CPP

P1-P3P4-P6P7-P8
_______________General Description
The MAX218 RS-232 transceiver is intended for battery-
powered EIA/TIA-232E and V.28/V.24 communications
interfaces that need two drivers and two receivers with
minimum power consumption. It provides a wide +1.8V
to +4.25V operating voltage range while maintaining
true RS-232 and EIA/TIA-562 voltage levels. The
MAX218 runs from two alkaline, NiCd, or NiMH cells
without any form of voltage regulator.
A shutdown mode reduces current consumption to
1µA, extending battery life in portable systems. While
shut down, all receivers can remain active or can be
disabled under logic control, permitting a system incor-
porating the CMOS MAX218 to monitor external
devices while in low-power shutdown mode.
A guaranteed 120kbps data rate provides compatibility
with popular software for communicating with personal
computers. Three-state drivers are provided on all
receiver outputs so that multiple receivers, generally of
different interface standards, can be wire-ORed at the
UART. The MAX218 is available in 20-pin DIP, SO, and
SSOP packages.
________________________Applications
Battery-Powered Equipment
Computers
Printers
Peripherals
Instruments
Modems
____________________________Features
BETTER THAN BIPOLAR!
♦ Operates Directly from Two Alkaline, NiCd,
or NiMH Cells
♦ +1.8V to +4.25V Supply Voltage Range
♦ 120kbps Data Rate
♦ Low-Cost Surface-Mount Components
♦ Meets EIA/TIA-232E Specifications
♦ 1µA Low-Power Shutdown Mode
♦ Both Receivers Active During Low-Power Shutdown
♦ Three-State Receiver Outputs
♦ Flow-Through Pinout
♦ On-Board DC-DC Converters
♦ 20-Pin SSOP, Wide SO, or DIP Packages
______________Ordering Information
*Contact factory for dice specifications.
MAX218
1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
GND
V+
C1+
GND
EN
SHDN
N.C.
LX
TOP VIEW
C1-
V-
T1OUT
T2OUT
T2IN
T1IN
V
CC
GND
12
11
9
10
R1IN
R2IN
R2OUT
R1OUT
DIP/SO/SSOP
MAX218
__________________Pin Configuration
R1
R2
T1
T2
T1OUT
T2OUT
T1IN
T2IN
R1OUT
R2OUT
R1IN
R2IN
GND
EN
V
CC
SHDN
LX
C1+
C1-
V-
6
3
7
8
9
10
11
12
13
14
16
18
15
4
5, 17, 20
MAX218
ENABLE
ON/OFF
1.8V
TO
4.25V
1
V+
19
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0246; Rev 1; 7/95
PART TEMP. RANGE
MAX218CPP 0°C to +70°C
MAX218C/D 0°C to +70°C Dice*
20 Plastic DIP
PIN-PACKAGE
MAX218CAP 0°C to +70°C 20 SSOP
MAX218EPP -40°C to +85°C
MAX218EAP -40°C to +85°C 20 SSOP
20 Plastic DIP
MAX218EWP -40°C to +85°C 20 Wide SO
MAX218CWP 0°C to +70°C 20 Wide SO
MAX218
1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
CC
= 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
CC
= 3.0V, 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.
Supply Voltages
V
CC
....................................................................-0.3V to +4.6V
V+.......................................................... (V
CC
- 0.3V) to +7.5V
V-.......................................................................+0.3V to -7.4V
V
CC
to V-..........................................................................+12V
LX ................................................................-0.3V to (1V + V+)
Input Voltages
T_IN, EN, S
—
H
—
D
—
N
–
................................................. -0.3V to +7V
R_IN.................................................................................±25V
Output Voltages
T_OUT.............................................................................±15V)
R_OUT....................................................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration, R_OUT, T_OUT to GND ....... Continuous
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 11.11mW/°C above +70°C) ..........889mW
Wide SO (derate 10.00mW/°C above +70°C)..............800mW
SSOP (derate 8.00mW/°C above +70°C) ...................640mW
Operating Temperature Ranges
MAX218C_ P..................................................... 0°C to +70°C
MAX218E_ P................................................... -40°C to +85°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10sec) ........................... +300°C
All transmitter outputs loaded with 3kΩ to ground
-15V < R_IN < +15V
No load, V
CC
= EN = S
—
H
—
D
—
N
–
= 3.0V, T
A
= +25°C
V
CC
= 1.8V to 3.6V
V
CC
= 1.8V to 4.25V
V
CC
= 1.8V to 4.25V
V
CC
= 2.0V to 4.25V
R_OUT, I
OUT
= 1.0mA
T_IN, EN, S
—
H
—
D
—
N
–
= 0V or V
CC
T_IN
T_IN, EN, S
—
H
—
D
—
N
–
S
—
H
—
D
—
N
–
= EN = 0V, all R_INs static
S
—
H
—
D
—
N
–
= 0V, EN = V
CC
, all R_INs static
R_OUT, 0V ≤ R_OUT ≤ V
CC
, EN = 0V
T_IN, EN, S
—
H
—
D
—
N
–
R_OUT, I
OUT
= -0.4mA
CONDITIONS
V±5 ±6Output Voltage Swing
kΩ357Input Resistance
V0.7Input Hysteresis
V
2.8
Input Threshold High
3.0
V
0.3
Input Threshold Low
0.4
V-25 +25Input Voltage Range
µA0.05 ±10Output Leakage Current
VV
CC
- 0.25 V
CC
- 0.08Output Voltage High
mA1.9 3.0Supply Current (Note 1)
V1.8 4.25Operating Voltage Range
V0.4Output Voltage Low
µA0.001 ±1Input Leakage Current
V0.1Input Hysteresis
V0.67 x V
CC
Input Logic Threshold High
0.04 10
µA
0.04 10
Shutdown Supply Current
V0.33 x V
CC
Input Logic Threshold Low
UNITSMIN TYP MAXPARAMETER
V
CC
= 0V, -2V < T_OUT < +2V
mA±24 ±100Output Short-Circuit Current
Ω300Output Resistance
DC CHARACTERISTICS
EIA/TIA-232E RECEIVER INPUTS
LOGIC
EIA/TIA-232E TRANSMITTER OUTPUTS
Note 1: Entire supply current for the circuit of Figure 1.
MAX218
1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
_______________________________________________________________________________________ 3
TIMING CHARACTERISTICS
(Circuit of Figure 1, V
CC
= 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
CC
= 3.0V, T
A
= +25°C.)
1000pF || 3kΩ load each transmitter,
150pF load each receiver
T
A
= +25°C, V
CC
= 3.0V, R
L
= 3kΩ to 7kΩ,
C
L
= 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
2500pF || 3kΩ load
150pF load
150pF load
2500pF || 3kΩ load
CONDITIONS
ns200 500t
DR
Receiver Output Disable Time
ns90 300t
ER
kbps120Data Rate
Receiver Output Enable Time
V/µs3.0 30Transition Region Slew Rate
1.8 2.7t
PLHT
Transmitter Propagation Delay
µs140 450t
ET
Transmitter Output Enable Time
ns
290 700t
PHLR
260 700t
PLHR
Receiver Propagation Delay
µs
1.9 2.7t
PHLT
UNITS
MIN TYP MAX
SYMBOLPARAMETER
ns500t
DT
Transmitter Output Disable Time
______________________________________________________________Pin Description
Receiver InputsR2IN, R1IN11, 12
Transmitter Outputs; swing between V+ and V-.T2OUT, T1OUT13, 14
Negative Supply generated on-boardV-15
Terminals for Negative Charge-Pump CapacitorC1-, C1+16, 18
Positive Supply generated on-boardV+19
Ground. Connect all GND pins to ground.GND5, 17, 20
Supply Voltage Input; 1.8V to 4.25V. Bypass to GND with at least 1µF. See
Capacitor
Selection
section.
V
CC
6
Transmitter InputsT1IN, T2IN7, 8
Receiver Outputs; swing between GND and V
CC.
R1OUT, R2OUT9, 10
Receiver Output Enable Control. Connect to V
CC
for normal operation. Connect to GND to
force the receiver outputs into high-Z state.
EN4
Shutdown Control. Connect to V
CC
for normal operation. Connect to GND to shut down the
power supply and to disable the drivers. Receiver status is not changed by this control.
S
—
H
—
D
—
N
–
3
PIN
Not internally connectedN.C.2
Inductor/Diode Connection PointLX1
FUNCTIONNAME
P1-P3P4-P6P7-P8

MAX218CPP

Mfr. #:
Buy MAX218CPP
Manufacturer:
Maxim Integrated
Description:
RS-232 Interface IC 1.8-4.25V True RS232 Dual Transceiver
Lifecycle:
New from this manufacturer.
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