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MAX3218CAP

P1-P3P4-P6P7-P9P10-P12
_______________General Description
The MAX3218 RS-232 transceiver is intended for bat -
tery-powered EIA/TIA-232E and V.28/V.24 communica-
tions interfaces that need two drivers and two receivers
with minimum power consumption from a single low-
voltage supply. It provides a wide +1.8V to +4.25V
operating voltage range while maintaining true RS-232
and EIA/TIA-562 voltage levels. The MAX3218 runs
from two alkaline, NiCd, or NiMH cells without any form
of voltage regulator. A guaranteed 120kbps data rate
provides compatibility with popular software for com -
municating with personal computers.
Supply current is reduced to 1 µA with Maxim’s new
AutoShutdown™ feature. When the MAX3218 does not
sense a valid signal level on the receiver inputs, the on-
board power-supply and drivers shut down. This
occurs if the RS-232 cable is disconnected or if the
transmitters of the connected peripheral are turned off.
The system turns on again when a valid level is applied
to either RS-232 receiver input. As a result, the system
saves power without changes to the existing software.
Additionally, the MAX3218 can be forced into or out of
shutdown, under logic control.
While shut down, all receivers can remain active or can
be disabled under logic control, permitting a system
incorporating the CMOS MAX3218 to monitor external
devices while in low-power shutdown. Three-state dri -
vers are provided on both receiver outputs so that multi -
ple receivers, generally of different interface standards,
can be on the same bus. The MAX3218 is available in
20-pin DIP and SSOP packages.
________________________Applications
Battery-Powered Equipment
Subnotebook Computers
PDAs
Hand-Held Equipment
Peripherals
Cellular Phones
____________________________Features
BETTER THAN BIPOLAR!
♦ 1µA Supply Current Using AutoShutdown™
♦ Operates Directly from Two Alkaline,
NiCd or NiMH Cells
♦ +1.8V to +4.25V Single-Supply Voltage Range
♦ 120kbps Data Rate Guaranteed
♦ Low-Cost Surface-Mount Components
♦ Meets EIA/TIA-232E Specifications
♦ Three-State Receiver Outputs
♦ Flow-Through Pinout
♦ On-Board DC-DC Converters
♦ 20-Pin SSOP and DIP Packages
______________Ordering Information
†
Contact factory for dice specifications.
MAX3218*
1µA Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown™
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
PART
MAX3218CPP
MAX3218CAP 0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 Plastic DIP
20 SSOP
19-0380; Rev 0; 3/95
MAX3218C/D
MAX3218EPP -40°C to +85°C
0°C to +70°C Dice
†
20 Plastic DIP
*
™ AutoShutdown is a trademark of Maxim Integrated Products.
MAX3218EAP -40°C to +85°C 20 SSOP
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
GND
V+
C1+
GND
FORCEON
FORCEOFF
INVALID
LX
TOP VIEW
C1-
V-
T1OUT
T2OUT
T2IN
T1IN
V
CC
GND
12
11
9
10
R1IN
R2IN
R2OUT
R1OUT
DIP/SSOP
MAX3218
__________________Pin Configuration
MAX3218
1µA Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown™
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, FORCEON, FORCEOFF
............................ -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
SSOP (derate 8.00mW/°C above +70°C) ..................640mW
Operating Temperature Ranges
MAX3218C_ P................................................... 0°C to +70°C
MAX3218E_ P ................................................. -40°C to +85°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10sec) ........................... +300°C
V
CC
= 3.0V, T
A
= +25°C, all R_IN open,
FORCEON = GND, FORCEOFF = V
CC
I
OUT
= -0.4mA,
|
R_IN
|
> 2.8V
I
OUT
= 1.0mA, -0.3V < R_IN < 0.3V
1µA supply current, Figure 4a
Figure 4a
R_OUT, I
OUT
= 1.0mA
T_IN, FORCEON = FORCEOFF = 0V or V
CC
T_IN, FORCEON, FORCEOFF
FORCEOFF = GND, T
A
= +25°C, V
CC
= 3.0V
R_OUT, 0V ≤ R_OUT ≤ V
CC
,
FORCEON = FORCEOFF = 0V
T_IN, FORCEON, FORCEOFF
R_OUT, I
OUT
= -0.4mA
CONDITIONS
V
V
CC
- 0.25
INVALID Output Low Voltage 0.4
V-0.3 0.3
Receiver Input Thresholds
Transmitters Disabled
V
2.8
Receiver Input Thresholds,
Transmitters Enabled
µA0.05 ±10Output Leakage Current
VV
CC
- 0.25 V
CC
- 0.08Output Voltage High
µA1.0 10Supply Current, AutoShutdown™
V1.8 4.25Operating Voltage Range
V0.4Output Voltage Low
µA0.001 ±1Input Leakage Current
V0.67 x V
CC
Input Logic Threshold High
1.0 10
V0.33 x V
CC
Input Logic Threshold Low
UNITSMIN TYP MAXPARAMETER
FORCEON = FORCEOFF = V
CC
= 3.0V, no load mA2.0 3.0
Supply Current,
AutoShutdown™ Disabled
Supply Current, Shutdown µA
INVALID Output High Voltage V
DC CHARACTERISTICS
AUTOSHUTDOWN (FORCEON = GND, FORCEOFF = V
CC
)
LOGIC INPUTS AND RECEIVER OUTPUTS
Positive threshold
Negative threshold -2.8
MAX3218
1µA Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown™
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(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.)
ns500t
DT
Transmitter Output Disable Time
2500pF || 3kΩ load each transmitter, one trans-
mitter switching, 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
kbps120 235Data Rate
Receiver Output Enable Time
V/µs3.0 30Transition Region Slew Rate
1.8 2.7t
PLHT
Transmitter Propagation Delay
µs250 450t
ET
Transmitter Output Enable Time
ns
290 1000t
PHLR
260 1000t
PLHR
Receiver Propagation Delay
µs
1.9 2.7t
PHLT
UNITSMIN TYP MAXSYMBOLPARAMETER
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.)
V
CC
= 2.0V to 4.25V
CONDITIONS
0.4
UNITSMIN TYP MAXPARAMETER
V
CC
= 1.8V to 4.25V
V
CC
= 1.8V to 4.25V
V
0.3
Input Threshold Low
3.0
-15V < R_IN < 15V kΩ357
V
CC
= 1.8V to 3.6V
Input Resistance
Input Hysteresis V
V
2.8
Input Threshold High
0.7
V
CC
= 0V, -2V < T_OUT < 2V
Output Short-Circuit Current mA
Ω300Output Resistance
±24 ±100
All transmitter outputs loaded with 3kΩ to groundOutput Voltage Swing V±5 ±6
V-25 +25Input Voltage Range
EIA/TIA-232E RECEIVER INPUTS
EIA/TIA-232E TRANSMITTER OUTPUTS
Figure 4b µs250t
WU
Receiver Threshold to
Transmitters Enabled
Figure 4b µs1t
INVH
Receiver Positive or Negative
Threshold to INVALID High
Figure 4b µs30t
INVL
Receiver Positive or Negative
Threshold to INVALID Low
AUTOSHUTDOWN TIMING
P1-P3P4-P6P7-P9P10-P12

MAX3218CAP

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IC TXRX RS232 120KBPS SD 20-SSOP
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