19-0144; Rev. 0; 9/93
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
_______________General Description
The MAX562 is designed specifically for notebook and
palmtop computers that need to transfer data quickly.
It runs at data rates up to 230kbps, and has a guaran-
teed 4V/µs slew rate. This device meets the new
EIA/TIA-562 standard that guarantees compatibility with
RS-232 interfaces.
The MAX562 has low-power shutdown and keep-awake
modes. In keep-awake mode, the transmitters are dis-
abled but all receivers are active, allowing unidirection-
al communication. In shutdown mode, the entire chip is
disabled and all outputs are in a high-impedance state.
The MAX562 is available in a standard 28-pin SO pack-
age, and in a smaller footprint shrink small-outline
package (SSOP).
____________________________Features
o
230kbps Data Rate, LapLink™ Compatible
o
Operates from a 2.7V to 5.25V Supply
o
Designed for EIA/TIA-562 and EIA/TIA-232 Applications
o
Guaranteed 4.0V/µs Slew Rate
o
3 Drivers, 5 Receivers
o
Flow Through Pinout
o
Low-Power Shutdown and Keep-Awake Modes
o
Low-Cost, Surface-Mount External Capacitors
MAX562
______________Ordering Information
PART
MAX562CWI
MAX562CAI
MAX562C/D
MAX562EWI
MAX562EAI
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SO
28 SSOP
Dice*
28 SO
28 SSOP
________________________Applications
Palmtop, Notebook, and Subnotebook
Computers
Peripherals
Battery-Powered Equipment
__________Typical Operating Circuit
0.33µF
+2.7V TO
+5.25V
0.33µF
2 C1A 5
3 C1B 4
C1A+ C1A-
C1B+ C1B- 28
1
VOLTAGE
V
CC
V+
0.33µF
DOUBLER/TRIPLER
INPUT
25
C2+
VOLTAGE
26
C2
V-
INVERTER
24 C2-
0.33µF
T1
IN
CMOS
INPUTS
T2
IN
T3
IN
R1
OUT
R2
OUT
CMOS
OUTPUTS
R3
OUT
R4
OUT
R5
OUT
EN
11
12
13
6
7
8
9
10
14
T1
T2
T3
R1
5k
R2
5k
R3
R4
5k
R5
5k
GND
27
19
15
21
5k
20
22
R2
IN
R3
IN
R4
IN
R5
IN
SHDN
EIA/TIA
-562
INPUTS
18
17
16
23
* Contact factory for dice specifications.
__________________Pin Configuration
MAX562
TOP VIEW
C3
C4
T1
OUT
T2
OUT
T3
OUT
R1
IN
EIA/TIA
-562
OUTPUTS
0.68µF
V
CC
1
0.33µF
C1A+
2
C1B+
3
C1B-
4
C1A-
5
R1
OUT
6
R2
OUT
7
R3
OUT
8
R4
OUT
9
R5
OUT
10
T1
IN
11
T2
IN
12
T3
IN
13
28
V+
27
GND
26
V-
25
C2+
MAX562
24
C2-
23
R1
IN
22
R2
IN
21
R3
IN
20
R4
IN
19
R5
IN
18
T1
OUT
17
T2
OUT
16
T3
OUT
15
SHDN
EN
14
SO/SSOP
™ LapLink is a registered trademark of Traveling Software, Inc.
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
MAX562
ABSOLUTE MAXIMUM RATINGS
V
CC
......................................................................... -0.3V to +6V
V+ ................................................................ (V
CC
- 0.3V) to +6V
V- ............................................................................ +0.3V to -6V
C1A+, C1B+.................................................. -6V to (V+ + 0.3V)
C1A-, C1B-, C2+ ........................................ -0.3V to (V+ + 0.3V)
C2- .................................................................. (V- - 0.3V) to +6V
Input Voltages
T
IN
, EN,
SHDN
........................................ -0.3V to (V
CC
+ 0.3V)
R
IN
....................................................................................±25V
Output Voltages
T
OUT
............................................................................... ±15V
R
OUT
...................................................... -0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration
T
OUT
to GND ........................................................ Continuous
R
OUT
to GND, V
CC
................................................ Continuous
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 12.50mW/°C above +70°C) .................. 1000mW
SSOP (derate 9.52mW/°C above +70°C) ................. 762mW
Operating Temperature Ranges:
MAX562C_ _ ..................................................... 0°C to +70°C
MAX562E_ _ .................................................. -40°C to +85°C
Storage Temperature Range ........................... -65°C to +160°C
Lead Temperature (soldering, 10sec) ........................... +300°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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 5.25V, C1A = C1B = C2 = C4 = 0.33µF, C3 = 0.68µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
EIA/TIA-562 TRANSMITTERS
Output Voltage Swing
Input Logic Threshold Low
Input Logic Threshold High
Output Leakage Current
Output Resistance
Output Short-Circuit Current
EIA/TIA-562 RECEIVERS
Input Voltage Operating Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
Output Voltage Low
Output Voltage High
Output Leakage Current
POWER SUPPLY
Operating Supply Voltage
V
CC
Power-Supply Current
Shutdown Supply Current with
Receivers Active
Shutdown Supply Current
V
CC
= 3.3V
No load
All outputs loaded 3kΩ
2.7
20
24
45
1
130
50
5.25
33
V
mA
µA
µA
No hysteresis when
SHDN
= 0V
-15V < V
IN
< 15V
I
OUT
= 1.6mA
I
OUT
= -1.0mA
EN = GND, 0V
≤
R
OUT
≤
V
CC
V
CC
-0.5
0.05
±10
3
0.3
5
7
0.4
0.8
2.4
±25
V
V
V
V
kΩ
V
V
µA
V
CC
= V+ = V- = 0V, V
OUT
= ±2V
V
OUT
= 0V
300
±60
All transmitter outputs loaded with 3kΩ to GND
T
IN
, EN,
SHDN
T
IN
, EN,
SHDN
V
CC
= 2.7V to 3.6V
V
CC
= 5.0V +5%, -10%
V
CC
= 2.7V to 3.6V
V
CC
= 5.0V +5%, -10%
1.8
3.0
±10
±3.7
±4.5
±6.0
0.6
0.8
V
V
V
µA
Ω
mA
CONDITIONS
MIN
TYP
MAX
UNITS
EN = V
CC
,
SHDN
= GND, T
A
= +25°C
SHDN
= EN = GND, T
A
= +25°C
2
_______________________________________________________________________________________
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
AC CHARACTERISTICS
PARAMETER
Data Rate
Transmitter Slew Rate
CONDITIONS
1000pF
||
3kΩ load each transmitter output,
150pF load each receiver output
C
L
= 50pF to 2500pF,
R
L
= 3kΩ to 7kΩ. Measured from +3V to -3V, or
-3V to +3V
R
L
= 3kΩ measured
from +3.3V to -3.3V
or -3.3V to +3.3V
2500pF
||
3kΩ load,
Figure 1
Figure 3
C
L
= 150pF,
SHDN
= VCC Figure 2
C
L
= 150pF,
SHDN
= GND
Figure 2
Figure 4
Figure 4
C
L
= 2500pF
C
L
= 1000pF
t
PHLT
t
PLHT
t
ET
t
DT
t
PHLR
t
PLHR
t
PHLS
t
PLHS
t
ER
t
DR
MIN
230.4
4
0.22
0.22
900
1000
100
600
100
250
3000
2000
100
250
250
ns
500
4000
ns
3000
250
500
ns
ns
TYP
280.0
6
30
3.1
µs
2.1
1700
1700
ns
µs
ns
MAX
UNITS
kbits/sec
V/µs
MAX562
Transmitter Rise/Fall Time
Transmitter Propagation Delay
Transmitter-Output Enable Time
Transmitter-Output Disable Time
Receiver Propagation Delay,
Normal Operation
Receiver Propagation Delay,
Keep-Awake Mode
Receiver-Output Enable Time
Receiver-Output Disable Time
_______________________________________________________________________________________
3
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
MAX562
__________________________________________Typical Operating Characteristics
(V
CC
= 3.3V, C1A = C1B = C2 = C4 = 0.33µF, C3 = 0.68µF, T
A
=+25°C, unless otherwise noted.)
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
8.0
TRANSMITTER OUTPUT VOLTAGE (V-, V+)
7.5
7.0
SLEW RATE (V/µs)
6.5
6.0
5.5
5.0
4.5
4.0
0
1000
2000
3000
4000
5000
SLEW-
SLEW+
ALL OUTPUTS LOADED
3kΩ II C
L
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
TRANSMITTER OUTPUT VOLTAGE
vs. TEMPERATURE
T_
OUT
+
+3.7V EIA/TIA-562
TRANSMITTER OUTPUT VOLTAGE (V-, V+)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE, TO 231kbps
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
T_
OUT
+
ALL TRANSMITTERS
LOADED 3kΩ II C
L
.....
ALL TRANSMITTERS LOADED 3kΩ
-3.7V EIA/TIA-562
T_
OUT
-
-40
0
40
80
.....
T_
OUT
-
0
1000
2000
3000
4000
5000
C
L
(pF)
TEMPERATURE (°C)
C
L
(pF)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
38
36
34
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
32
30
28
26
24
22
20
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
5.5
ALL TRANSMITTERS LOADED 3kΩ
38
36
SUPPLY CURRENT
vs. TEMPERATURE
55
50
SUPPLY CURRENT (mA)
V
CC
= +2.7V
45
40
35
30
25
20
-40
0
40
80
0
SUPPLY CURRENT
vs. TRANSMITTER DATA RATE
34
32
30
28
26
24
22
3 OUTPUTS LOADED
3kΩ II 2500pF
ALL TRANSMITTERS LOADED 3kΩ
2 OUTPUTS LOADED
3kΩ II 2500pF
1 OUTPUT LOADED
3kΩ II 2500pF
50
100
150
200
250
DATA RATE (kbps)
V
CC
= +3.3V
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE
60
SHDN = 0, EN = 1
ALL TRANSMITTERS LOADED 3kΩ
55
SUPPLY CURRENT (µA)
50
V
CC
= +3.3V
V
CC
= +2.7V
40
45
35
-40
0
40
80
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
______________________________________________________________Pin Description
PIN
NAME
V+
C1A+, C1A-
C1B+, C1B-
R_
OUT
T_
IN
EN
SHDN
T_
OUT
R_
IN
C2+, C2-
V-
GND
V
CC
FUNCTION
Positive charge-pump output, typically 5.8V
Terminals for positive charge-pump capacitor
Terminals for positive charge-pump capacitor
TTL/CMOS Receiver Outputs.
TTL/CMOS Driver Inputs
Receiver Enable, see
Shutdown and Enable Control
section.
Shutdown Control, see
Shutdown and Enable Control
section.
EIA/TIA-562 Driver Outputs
EIA/TIA-562 Receiver Inputs
Terminals for negative charge-pump capacitor
Negative charge-pump output, typically -5.2V
Ground
+2.7V to +5.25V Supply Voltage
MAX562
28
2, 5
3, 4
6, 7, 8, 9, 10
11, 12, 13
14
15
16, 17, 18
19, 20, 21, 22, 23
24, 25
26
27
1
+3V
INPUT
0V
INPUT
+3V
50%
50%
0V
V
CC
50%
50%
GND
t
PLHR
t
PLHS
OUTPUT
V
OH
0V
V
OL
t
PHLT
OUTPUT
t
PLHT
t
PHLR
t
PHLS
Figure 1. Transmitter Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
_______________________________________________________________________________________
5
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