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19-1751; Rev 0; 6/00
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
General Description
The MAX3316–MAX3319 transceivers have a proprietary
low-dropout transmitter output stage enabling RS-232-
compatible performance from +2.25V to +3.0V with a
dual-charge pump. These devices require only four
0.1µF capacitors, and are guaranteed to operate at data
rates up to 460kbps.
The MAX3318/MAX3319 achieve a 1µA supply current
using Maxim’s revolutionary AutoShutdown Plus™ fea-
ture. These devices automatically enter a low-power
shutdown mode when the RS-232 cable is disconnected
or the transmitters of the connected peripherals are inac-
tive for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiver
input. AutoShutdown Plus saves power without changes
to the existing BIOS or operating system. The MAX3318
is a 2-Tx/2-Rx device while the MAX3319 is a 1-Tx/1-Rx
device. These devices also feature a logic-level output
(READY) that asserts when the charge pump is regulat-
ing and the device is ready to begin transmitting.
The MAX3316/MAX3317 are 2-Tx/2-Rx transceivers. The
MAX3317 features a 1µA shutdown mode that can be
entered by driving
SHDN
low. The MAX3317’s receivers
remain active while in shutdown mode, allowing external
devices such as modems to be monitored using only
1µA supply current.
These devices are available in space-saving packages:
MAX3316 (16-pin SSOP and 20-pin TSSOP), MAX3317/
MAX3318 (20-pin SSOP and 20-pin TSSOP), and
MAX3319 (16-pin SSOP).
Features
o
AutoShutdown Plus (MAX3318/MAX3319)
o
300µA Operating Supply Current
o
1µA Low-Power Shutdown with Receivers Active
o
Guaranteed 460kbps Data Rate
o
Guaranteed 4V/µs Slew Rate
o
RS-232 Compatible Down to 2.25V
MAX3316–MAX3319
Ordering Information
PART
MAX3316CUP
MAX3316CAE
MAX3316EUP
MAX3316EAE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
16 SSOP
20 TSSOP
16 SSOP
Ordering Information continued at end of data sheet.
Typical Application Circuits
+2.5V
C
BYPASS
C1
0.1µF
0.1µF
2 C1+
4 C1-
5
C2
0.1µF
CMOS
INPUT
CMOS
OUTPUT
6
C2+
C2-
T1OUT 13
15
V
CC
V+
3
C3
0.1µF
7
C4
0.1µF
RS-232-
COMPATIBLE
OUTPUT
RS-232-
COMPATIBLE
INPUT
MAX3319
V-
________________________Applications
Palmtop Computers
Hand-Held Instruments
Pagers
Cellular Phones
GPS
Handy Terminals
Hand-Held Electronic Books
AutoShutdown Plus is a trademark of Maxim Integrated Products.
Pin Configurations appear at end of data sheet.
11 T1IN
9 R1OUT
R1IN 8
5k
1
READY
AutoShutdown
Plus
INVALID 10
TO POWER-
MANAGEMENT
UNIT
V
CC
12
FORCEON
GND
14
FORCEOFF 16
Typical Application Circuits continued at end of data sheet.
Selector Guide
PART
MAX3316
MAX3317
MAX3318
MAX3319
NO. OF DRIVERS/
RECEIVERS
2/2
2/2
2/2
1/1
GUARANTEED
DATA RATE (kbps)
460
460
460
460
READY OUTPUT
—
—
SHUTDOWN
—
—
—
AutoShutdown
Plus
—
—
1
________________________________________________________________
Maxim Integrated Products
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.
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
MAX3316–MAX3319
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
V+ to GND (Note 1) ..................................................-0.3V to +7V
V- to GND (Note 1) ...................................................-7V to +0.3V
V+ + |V-| (Note 1) .................................................................+13V
Input Voltages
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
to GND ..................................................-0.3V to +6V
R_IN to GND .....................................................................±25V
Output Voltages
T_OUT to GND ...............................................................±13.2V
R_OUT,
INVALID,
READY to GND ..........-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration, T_OUT to GND.......................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C).........571mW
20-Pin SSOP (derate 8.00mW/°C above +70°C).........640mW
20-Pin TSSOP (derate 7.00mW/°C above +70°C).......559mW
Operating Temperature Ranges
MAX331_C_ _.....................................................0°C to +70°C
MAX331_E_ _ ..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Die Temperature ..............................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot 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
(V
CC
= +2.25V to +3.0V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
FORCEON = GND,
FORCEOFF
= V
CC
,
all R_IN idle, all T_IN idle
(MAX3318/MAX3319)
SHDN
= GND (MAX3317),
FORCEOFF
= GND
(MAX3318/MAX3319)
SHDN
= V
CC
, no load (MAX3317),
FORCEON =
FORCEOFF
= V
CC
, no load
(MAX3318/MAX3319)
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
EN
= V
CC
(MAX3317), receivers disabled
I
OUT
= 0.5mA
I
OUT
= -0.5mA
0.9
✕
V
CC
-25
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
All transmitter outputs loaded with 3kΩ to
ground
0.7
✕
V
CC
0.3
3
5
7
+25
0.3
✕
V
CC
0.7
✕
V
CC
0.3
±0.01
±0.05
±1
±10
0.1
✕
V
CC
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
(V
CC
= +2.5V, T
A
= +25°C)
AutoShutdown Plus Supply
Current
Shutdown Supply Current
1
10
µA
1
10
µA
Supply Current
LOGIC INPUTS
Input Logic Threshold Low
Input Logic Threshold High
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Current
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
0.3
1
mA
0.3
✕
V
CC
V
V
V
µA
µA
V
V
V
V
V
V
kΩ
±3.7
±4
V
2
_______________________________________________________________________________________
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.25V to +3.0V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
PARAMETER
Output Resistance
Output Short-Circuit Current
Output Leakage Current
V
CC
= 0 or 2.25V to 3.0V, V
OUT
= ±12V,
transmitters disabled
Positive threshold
Negative threshold
-2.7
-0.3
0.3
0.1
✕
V
CC
0.9
✕
V
CC
1
30
100
15
30
60
SYMBOL
CONDITIONS
V
CC
= 0, transmitter output = ±2V
MIN
300
TYP
10M
±25
±60
±25
MAX
UNITS
Ω
mA
µA
MAX3316–MAX3319
AutoShutdown Plus
(FORCEON = GND,
FORCEOFF
= V
CC
) (MAX3318/MAX3319)
Receiver Input Threshold to
INVALID
Output High
Receiver Input Threshold to
INVALID
Output Low
INVALID,
READY Output
Voltage Low
INVALID,
READY Output
Voltage High
Receiver Positive or Negative
Threshold to
INVALID
High
Receiver Positive or Negative
Threshold to
INVALID
Low
Receiver or Transmitter Edge to
Transmitters Enabled
Receiver or Transmitter Edge to
Transmitters Shutdown
t
INVH
t
INVL
t
WU
t
AUTO-
SHDN
Figure 4a
Figure 4a
I
OUT
= 0.5mA
I
OUT
= -0.5mA
Figure 4b
Figure 4b
Figure 4b (Note 2)
2.7
V
V
V
V
µs
µs
µs
s
V
CC
= 2.5V, Figure 4b (Note 2)
TIMING CHARACTERISTICS
(V
CC
= +2.25V to +3.0V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
|t
PHL
- t
PLH
|
t
PHL
t
PLH
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF, one transmitter
switching
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3317)
Normal operation (MAX3317)
|t
PHL
- t
PLH
|
(Note 3)
MIN
460
0.175
0.175
250
250
100
50
TYP
MAX
UNITS
kbps
µs
ns
ns
ns
ns
_______________________________________________________________________________________
3
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
MAX3316–MAX3319
TIMING CHARACTERISTICS (continued)
(V
CC
= +2.25V to +3.0V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
V
CC
= 2.5V, T
A
= +25°C, R
L
= 3kΩ to 7kΩ,
one transmitter switching, measured from +3V
to -3V or -3V to +3V, C
L
= 150pF to 2500pF
MIN
TYP
MAX
UNITS
Transition-Region Slew Rate
4
30
V/µs
Note 2:
A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3:
Transmitter skew is measured at the transmitter zero crosspoints.
Typical Operating Characteristics
(V
CC
= +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, T
A
= +25°C, unless otherwise noted.)
MAX3316/MAX3317
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
T_OUT+
TRANSMITTER OUTPUT VOLTAGE (V)
4
2
0
-2
-4
-6
3.45
3.65
2.25
2.45
2.65
2.85
3.05
3.25
3.45
3.65
V
CC
(V)
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
MAX3316 TOC02
MAX3316/MAX3317
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316 TOC01
10
460kbps
230kbps
6
6
8
SUPPLY CURRENT (mA)
4
20kbps
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
2.25
2.45
2.65
2.85
3.05
3.25
V
CC
(V)
2
0
MAX3316/MAX3317
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316 TOC03
MAX3316/MAX3317
SLEW RATE vs. LOAD CAPACITANCE
FOR DATA RATES UP TO 460kbps
-SLEW
MAX3316 TOC04
5
TRANSMITTER OUTPUT VOLTAGE (V)
4
3
2
1
0
-1
-2
-3
-4
-5
0
1000
2000
T_OUT-
T_OUT+
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
10
8
SLEW RATE (V/µs)
6
+SLEW
4
2
0
3000
0
1000
2000
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
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