19-1616; Rev 1; 6/00
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
________________General Description
The MAX3316E–MAX3319E are 2.5V powered RS-232
compatible transceivers. These devices feature shut-
down (MAX3317E), AutoShutdown Plus™ (MAX3318E/
MAX3319E), and enhanced electrostatic discharge
(ESD) protection integrated into the chip. All transmitter
outputs and receiver inputs are protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method,
±8kV using the IEC 1000-4-2 Contact Discharge
method, and ±15kV using the Human Body Model.
All devices are guaranteed at a data rate of 460kbps.
The transceivers have a proprietary low-dropout trans-
mitter output stage enabling RS-232 compatible opera-
tion from a +2.25V to +3.0V supply with a dual charge
pump. The charge pump requires only four 0.1µF
capacitors. The MAX3318E/MAX3319E feature a logic-
level output (READY) that asserts when the charge
pump is regulating and the device is ready to begin
transmitting.
The MAX3318E/MAX3319E achieve a 1µA supply current
using Maxim’s revolutionary AutoShutdown Plus feature.
These devices automatically enter a low-power shut-
down mode when the RS-232 cable is disconnected or
the transmitters of the connected peripherals are inactive
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
MAX3317E also features a 1µA shutdown mode that
can be entered by driving
SHDN
low. The MAX3317E’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:
MAX3316E (16-pin SSOP and 20-pin TSSOP), MAX3317E/
MAX3318E (20-pin SSOP and 20-pin TSSOP), and
MAX3319E (16-pin SSOP).
____________________________Features
o
ESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
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
MAX3316E–MAX3319E
Ordering Information
PART
MAX3316ECUP
MAX3316ECAE
MAX3316EEUP
MAX3316EEAE
MAX3317ECUP
MAX3317ECAP
MAX3317EEUP
MAX3317EEAP
MAX3318ECUP
MAX3318ECAP
MAX3318EEUP
MAX3318EEAP
MAX3319ECAE
MAX3319EEAE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
16 SSOP
20 TSSOP
16 SSOP
20 TSSOP
20 SSOP
20 TSSOP
20 SSOP
20 TSSOP
20 SSOP
20 TSSOP
20 SSOP
16 SSOP
16 SSOP
Pin Configurations
READY 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R2IN 9
R2OUT 10
20 FORCEOFF
19 V
CC
18 GND
17 T1OUT
________________________Applications
Palmtop Computers
Hand-Held Instruments
Pagers
Cellular Phones
GPS
Handy Terminals
Hand-Held Electronic Books
Selector Guide and Typical Application Circuits appear at
end of data sheet.
AutoShutdown Plus is a trademark of Maxim Integrated Products.
MAX3318E
16 R1IN
15 R1OUT
14 FORCEON
13 T1IN
12 T2IN
11 INVALID
SSOP/TSSOP
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
MAX3316E–MAX3319E
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 Range
MAX331_EC_ _ .................................................0°C to +70°C
MAX331_EE_ _ ..............................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +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
(MAX3318E/MAX3319E)
SHDN
= GND (MAX3317E);
FORCEOFF
=
GND (MAX3318E/MAX3319E)
SHDN
= V
CC
, no load (MAX3317E);
FORCEON =
FORCEOFF
= V
CC
, no load
(MAX3318E/MAX3319E)
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
T_IN,
EN, SHDN,
FORCEON,
FORCEOFF
EN
= V
CC
(MAX3317E), 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
_______________________________________________________________________________________
±15kV ESD-Protected, 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
ESD PROTECTION
Human Body Model
R_IN, T_OUT
IEC 1000-4-2 Air-Gap Discharge method
IEC 1000-4-2 Contact Discharge method
AutoShutdown Plus
(FORCEON = GND,
FORCEOFF
= V
CC
) (MAX3318E/MAX3319E)
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
MAX3316E–MAX3319E
SYMBOL
CONDITIONS
V
CC
= 0, transmitter output = ±2V
V
CC
= 0 or 2.25V to 3.0V, V
OUT
= ±12V,
transmitters disabled
MIN
300
TYP
10M
±25
MAX
±60
±25
UNITS
Ω
mA
µA
±15
±15
±8
2.7
-2.7
-0.3
0.3
0.1
·
V
CC
0.9
·
V
CC
1
30
100
15
30
60
kV
Figure 4a
Figure 4a
I
OUT
= 0.5mA
I
OUT
= -0.5mA
V
CC
= 2.5V, Figure 4b
V
CC
= 2.5V, Figure 4b
Positive threshold
Negative threshold
V
V
V
V
µs
µs
µs
s
V
CC
= 2.5V, Figure 4b (Note 2)
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 (MAX3317E)
Normal operation (MAX3317E)
|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
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
MAX3316E–MAX3319E
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
Transition-Region Slew Rate
SYMBOL
CONDITIONS
V
CC
= 2.5V, T
A
= +25°C, R
L
= 3kΩ to 7kΩ,
measured from +3V to -3V or -3V to +3V,
C
L
= 150pF to 2500pF
MIN
4
TYP
MAX
30
UNITS
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.)
MAX3316E/MAX3317E
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316E TOC01
10
460kbps
230kbps
6
MAX3316E/MAX3317E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
T_OUT+
TRANSMITTER OUTPUT VOLTAGE (V)
4
2
0
-2
-4
-6
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
MAX3316E TOC02
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
3.45
3.65
V
CC
(V)
2
0
MAX3316E/MAX3317E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316E TOC03
MAX3316E/MAX3317E
SLEW RATE vs. LOAD CAPACITANCE
FOR DATA RATES UP TO 460kps
-SLEW
MAX3316E 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
_______________________________________________________________________________________
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
Typical Operating Characteristics (continued)
(V
CC
= +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, T
A
= +25°C, unless otherwise noted.)
MAX3316E–MAX3319E
MAX3316E/MAX3317E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3316E TOC05
MAX3318E/MAX3319E
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316E TOC06
MAX3318E/MAX3319E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
4
2
0
-2
-4
-6
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
C
L
= 1000pF
MAX3316E TOC07
35
30
SUPPLY CURRENT (mA)
25
T1 TRANSMITTING AT SPECIFIED DATA RATE
T2 TRANSMITTING AT 20kbps
15
460kbps
12
SUPPLY CURRENT (mA)
230kbps
9
20kbps
6
460kbps
20
15
10
5
0
0
1000
2000
LOAD CAPACITANCE (pF)
3000
20kbps
230kbps
6
3
0
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
3.45
3.65
2.25
2.45
2.65
2.85
3.05
3.25
3.45
3.65
V
CC
(V)
V
CC
(V)
MAX3318E/MAX3319E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316E TOC08
MAX3318E/MAX3319E
SLEW RATE vs. LOAD CAPACITANCE
MAX3316E TOC09
MAX3318E/MAX3319E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
460kbps
20
230kbps
15
10
5
20kbps
MAX3316E TOC10
5
TRANSMITTER OUTPUT VOLTAGE (V)
4
3
2
1
0
-1
-2
-3
-4
-5
0
1000
2000
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
T_OUT+
10
35
30
SUPPLY CURRENT (mA)
25
8
SLEW RATE (V/µs)
-SLEW
6
+SLEW
4
2
T_OUT-
0
3000
0
LOAD CAPACITANCE (pF)
FOR DATA RATES UP TO 460kbs
1000
2000
3000
0
0
1000
2000
LOAD CAPACITANCE (pF)
3000
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
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