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General Description
The MAX3316MAX3319 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 PlusTM 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).
________________________Applications
Palmtop Computers
Hand-Held Instruments
Pagers
Cellular Phones
GPS
Handy Terminals
Hand-Held Electronic Books
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
MAX3316MAX3319
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
________________________________________________________________ Maxim Integrated Products
1
MAX3319
FORCEON
READY
AutoShutdown
Plus
12
1
R1OUT
9
FORCEOFF 16
INVALID
10
GND
14
T1IN
11
C2-
6
C2+
5
C1-
4
C1+
2
R1IN 8
T1OUT 13
V-
7
V+
3
V
CC
V
CC
C4
0.1
µF
C3
0.1
µF
0.1
µF
15
C1
0.1
µF
C2
0.1
µF
C
BYPASS
+2.5V
TO POWER-
MANAGEMENT
UNIT
5k
CMOS
INPUT
RS-232-
COMPATIBLE
OUTPUT
RS-232-
COMPATIBLE
INPUT
CMOS
OUTPUT
Typical Application Circuits
19-1751; Rev 0; 6/00
Ordering Information
AutoShutdown Plus is a trademark of Maxim Integrated Products.
Pin Configurations appear at end of data sheet.
Typical Application Circuits continued at end of data sheet.
PIN-PACKAGE
TEMP. RANGE
PART
MAX3316CUP
0°C to +70°C
20 TSSOP
16 SSOP
0°C to +70°C
MAX3316CAE
MAX3316EUP
-40°C to +85°C
20 TSSOP
16 SSOP
-40°C to +85°C
MAX3316EAE
PART
NO. OF DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE (kbps)
READY OUTPUT
SHUTDOWN
--
--
460
460
--
--
--
460
460
2/2
2/2
2/2
1/1
MAX3316
MAX3317
MAX3318
MAX3319
AutoShutdown
Plus
--
--
Selector Guide
Ordering Information continued 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.
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.25V to +3.0V, C1C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
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
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.
MAX3316MAX3319
TRANSMITTER OUTPUTS
PARAMETER
RECEIVER INPUTS
RECEIVER OUTPUTS
LOGIC INPUTS
SYMBOL
MIN
TYP
MAX
UNITS
Input Logic Threshold High
0.7
V
CC
V
Input Logic Threshold Low
0.3
V
CC
V
Supply Current
0.3
1
mA
Transmitter Input Hysteresis
0.3
V
Input Leakage Current
±0.01
±1
µA
Output Leakage Current
±0.05
±10
µA
AutoShutdown Plus Supply
Current
1
10
µA
Shutdown Supply Current
1
10
µA
Output Voltage Low
0.1
V
CC
V
Output Voltage High
0.9
V
CC
V
Input Voltage Range
-25
+25
V
Input Threshold Low
0.3
V
CC
V
Input Threshold High
0.7
V
CC
V
Input Hysteresis
0.3
V
Input Resistance
3
5
7
k
Output Voltage Swing
±3.7
±4
V
CONDITIONS
I
OUT
= 0.5mA
T_IN, EN, SHDN, FORCEON, FORCEOFF
I
OUT
= -0.5mA
T_IN, EN, SHDN, FORCEON, FORCEOFF
SHDN = V
CC
, no load (MAX3317),
FORCEON = FORCEOFF = V
CC
, no load
(MAX3318/MAX3319)
T_IN, EN, SHDN, FORCEON, FORCEOFF
EN = V
CC
(MAX3317), receivers disabled
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
FORCEON = GND, FORCEOFF = V
CC
,
all R_IN idle, all T_IN idle
(MAX3318/MAX3319)
All transmitter outputs loaded with 3k
to
ground
SHDN = GND (MAX3317), FORCEOFF = GND
(MAX3318/MAX3319)
DC CHARACTERISTICS (V
CC
= +2.5V, T
A
= +25°C)
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
TRANSMITTER OUTPUTS
MAX3316MAX3319
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.25V to +3.0V, C1C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
TIMING CHARACTERISTICS
(V
CC
= +2.25V to +3.0V, C1C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
R_IN to R_OUT, C
L
= 150pF
R
L
= 3k
, C
L
= 1000pF, one transmitter
switching
Normal operation (MAX3317)
Normal operation (MAX3317)
(Note 3)
CONDITIONS
0.175
t
PLH
µs
0.175
t
PHL
kbps
460
Maximum Data Rate
Receiver Propagation Delay
ns
250
Receiver Output Enable Time
ns
250
Receiver Output Disable Time
ns
100
|t
PHL
- t
PLH
|
Transmitter Skew
ns
50
|t
PHL
- t
PLH
|
Receiver Skew
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Receiver Positive or Negative
Threshold to INVALID Low
t
INVL
30
µs
Receiver or Transmitter Edge to
Transmitters Enabled
t
WU
100
µs
Receiver or Transmitter Edge to
Transmitters Shutdown
t
AUTO-
SHDN
15
30
60
s
Negative threshold
Figure 4b
Figure 4b (Note 2)
V
CC
= 2.5V, Figure 4b (Note 2)
Positive threshold
Receiver Input Threshold to
INVALID Output High
2.7
V
-2.7
Receiver Input Threshold to
INVALID Output Low
-0.3
0.3
V
INVALID, READY Output
Voltage Low
0.1
V
CC
V
INVALID, READY Output
Voltage High
0.9
V
CC
V
Receiver Positive or Negative
Threshold to INVALID High
t
INVH
1
µs
Figure 4a
Figure 4a
I
OUT
= 0.5mA
I
OUT
= -0.5mA
Figure 4b
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Output Resistance
300
10M
Output Short-Circuit Current
±25
±60
mA
Output Leakage Current
±25
µA
CONDITIONS
V
CC
= 0, transmitter output = ±2V
V
CC
= 0 or 2.25V to 3.0V, V
OUT
= ±12V,
transmitters disabled
AutoShutdown Plus (FORCEON = GND, FORCEOFF = V
CC
) (MAX3318/MAX3319)
MAX3316MAX3319
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= +2.5V, C1C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3k
, T
A
= +25°C, unless otherwise noted.)
0
2
6
4
8
10
2.25
2.65
2.45
2.85
3.05
3.25
3.45
3.65
MAX3316/MAX3317
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316 TOC01
V
CC
(V)
SUPPLY CURRENT (mA)
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
460kbps
230kbps
20kbps
-6
-2
-4
2
0
4
6
2.25
2.85
3.05
2.45
2.65
3.25
3.45
3.65
MAX3316/MAX3317
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX3316 TOC02
V
CC
(V)
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
-5
-2
-3
-4
-1
0
1
2
3
4
5
0
1000
2000
3000
MAX3316/MAX3317
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316 TOC03
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
0
2
6
4
8
10
MAX3316/MAX3317
SLEW RATE vs. LOAD CAPACITANCE
MAX3316 TOC04
LOAD CAPACITANCE (pF)
SLEW RATE (V/
µ
s)
0
2000
1000
3000
-SLEW
+SLEW
FOR DATA RATES UP TO 460kbps
TIMING CHARACTERISTICS (continued)
(V
CC
= +2.25V to +3.0V, C1C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +2.5V,
T
A
= +25°C.)
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.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V/µs
4
30
V
CC
= 2.5V, T
A
= +25°C, R
L
= 3k
to 7k,
one transmitter switching, measured from +3V
to -3V or -3V to +3V, C
L
= 150pF to 2500pF
Transition-Region Slew Rate
MAX3316MAX3319
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
_______________________________________________________________________________________
5
0
3
9
6
12
15
2.25
2.65
2.45
2.85
3.05
3.25
3.45
3.65
MAX3318/MAX3319
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316 TOC06
V
CC
(V)
SUPPLY CURRENT (mA)
460kbps
230kbps
20kbps
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
-6
-2
-4
2
0
4
6
2.25
2.85
3.05
2.45
2.65
3.25
3.45
3.65
MAX3318/MAX3319
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX3316 TOC07
V
CC
(V)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
T_OUT+
T_OUT-
-5
-2
-3
-4
-1
0
1
2
3
4
5
0
1000
2000
3000
MAX3318/MAX3319
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316 TOC08
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
0
2
6
4
8
10
MAX3318/MAX3319
SLEW RATE vs. LOAD CAPACITANCE
MAX3316 TOC09
LOAD CAPACITANCE (pF)
SLEW RATE (V/
µ
s)
0
2000
1000
3000
-SLEW
+SLEW
FOR DATA RATES UP TO 460kbps
0
10
5
20
15
30
25
35
MAX3318/MAX3319
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3316 TOC10
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
0
1000
2000
3000
460kbps
230kbps
20kbps
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
Typical Operating Characteristics (continued)
(V
CC
= +2.5V, C1C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3k
, T
A
= +25°C, unless otherwise noted.)
0
10
5
20
15
30
25
35
MAX3316/MAX3317
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3316 TOC05
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
0
1000
2000
3000
T1 TRANSMITTING AT SPECIFIED DATA RATE
T2 TRANSMITTING AT 20kbps
460kbps
230kbps
20kbps
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