MAXIM MAX562 User Manual
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 guaranteed 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 disabled but all receivers are active, allowing unidirectional 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 package, and in a smaller footprint shrink small-outline
package (SSOP).
________________________Applications
Palmtop, Notebook, and Subnotebook
Computers
Peripherals
Battery-Powered Equipment
__________Typical Operating Circuit
0.33µF 0.33µF
+2.7V TO
+5.25V
INPUT
CMOS
INPUTS
CMOS
OUTPUTS
0.33µF
R1
R2
R3
R4
R5
0.33µF
T1
IN
T2
IN
T3
IN
OUT
OUT
OUT
OUT
OUT
EN
2
C1A C1B
C1A+ C1A- C1B+ C1B-
1
V
CC
DOUBLER/TRIPLER
25
C2+
C2
24
C2-
11
12
13
6
7
8
9
10
14
VOLTAGE
VOLTAGE
INVERTER
T1
T2
T3
R1
R2
R3
R4
R5
GND
27
MAX562
453
28
V+
C3 0.68µF
26
V-
5k
5k
5k
5k
5k
18
17
16
23
22
21
20
19
15
C4 0.33µF
T1
OUT
T2
OUT
T3
OUT
R1
IN
R2
IN
R3
IN
R4
IN
R5
IN
SHDN
EIA/TIA
-562
OUTPUTS
EIA/TIA
-562
INPUTS
____________________________Features
♦ 230kbps Data Rate, LapLink™ Compatible
♦ Operates from a 2.7V to 5.25V Supply
♦ Designed for EIA/TIA-562 and EIA/TIA-232 Applications
♦ Guaranteed 4.0V/µs Slew Rate
♦ 3 Drivers, 5 Receivers
♦ Flow Through Pinout
♦ Low-Power Shutdown and Keep-Awake Modes
♦ Low-Cost, Surface-Mount External Capacitors
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX562CWI 0°C to +70°C 28 SO
MAX562CAI 0°C to +70°C 28 SSOP
MAX562C/D 0°C to +70°C Dice*
MAX562EWI -40°C to +85°C 28 SO
MAX562EAI -40°C to +85°C 28 SSOP
* Contact factory for dice specifications.
__________________Pin Configuration
TOP VIEW
V+
28
GND
27
V-
26
C2+
25
C2-
24
R1
23
IN
22
R2
IN
21
R3
IN
20
R4
IN
19
R5
IN
18
T1
OUT
T2
17
OUT
T3
16
OUT
15
SHDN
C1A+
C1B+
C1BC1A-
R1
R2
R3
R4
R5
1
V
CC
2
3
4
5
OUT
OUT
OUT
OUT
OUT
T1
T2
T3
EN
MAX562
6
7
8
9
10
IN
11
12
IN
13
IN
14
SO/SSOP
MAX562
™ LapLink is a registered trademark of Traveling Software, Inc.
________________________________________________________________
Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
VCC......................................................................... -0.3V to +6V
V+ ................................................................ (V
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
MAX562
T
, EN,
SHDN
IN
R
....................................................................................±25V
IN
Output Voltages
T
OUT
R
OUT
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.
........................................ -0.3V to (VCC+ 0.3V)
............................................................................... ±15V
...................................................... -0.3V to (VCC+ 0.3V)
- 0.3V) to +6V
CC
ELECTRICAL CHARACTERISTICS
(VCC= 2.7V to 5.25V, C1A = C1B = C2 = C4 = 0.33µF, C3 = 0.68µF, TA= T
PARAMETER MIN TYP MAX UNITS
EIA/TIA-562 TRANSMITTERS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND ±3.7 ±4.5 ±6.0 V
Input Logic Threshold Low
Input Logic Threshold High
Output Leakage Current ±10 µA
Output Resistance VCC= V+ = V- = 0V, V
Output Short-Circuit Current V
EIA/TIA-562 RECEIVERS
Input Voltage Operating Range ±25 V
Input Threshold Low 0.8 V
Input Threshold High 2.4 V
Input Hysteresis
Input Resistance -15V < VIN< 15V 3 5 7 kΩ
Output Voltage Low I
Output Voltage High I
Output Leakage Current
POWER SUPPLY
Operating Supply Voltage 2.7 5.25 V
VCCPower-Supply Current VCC= 3.3V
Shutdown Supply Current with
Receivers Active
Shutdown Supply Current
TIN, EN,
SHDN
TIN, EN,
SHDN
= 0V ±60 mA
OUT
No hysteresis when
= 1.6mA 0.4 V
OUT
= -1.0mA V
OUT
EN = GND, 0V ≤ R
EN = VCC,
SHDN
= EN = GND, TA= +25°C
CONDITIONS
OUT
SHDN
≤ V
OUT
SHDN
= GND, TA= +25°C
Short-Circuit Duration
to GND........................................................ Continuous
T
OUT
R
to GND, VCC................................................ Continuous
OUT
Continuous Power Dissipation (T
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
to T
MIN
VCC= 2.7V to 3.6V 0.6
VCC= 5.0V +5%, -10% 0.8
VCC= 2.7V to 3.6V 1.8
VCC= 5.0V +5%, -10% 3.0
= ±2V 300 Ω
= 0V
CC
No load 20 33
All outputs loaded 3kΩ 24
, unless otherwise noted.)
MAX
VCC-0.5
= +70°C)
A
0.3 V
0.05 ±10 µA
45 130 µA
1 50 µA
mA
V
V
2 _______________________________________________________________________________________
Complete 230kbps, 2.7V to 5.25V
Serial Interface for Notebook Computers
AC CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Data Rate
Transmitter Slew Rate
Transmitter Rise/Fall Time
Transmitter Propagation Delay
Transmitter-Output Enable Time 100 µs
Transmitter-Output Disable Time Figure 3 600 ns
Receiver Propagation Delay,
Normal Operation
Receiver Propagation Delay,
Keep-Awake Mode
Receiver-Output Enable Time Figure 4 100 250 ns
Receiver-Output Disable Time Figure 4 250 500 ns
1000pF || 3kΩ load each transmitter output,
150pF load each receiver output
CL= 50pF to 2500pF,
RL= 3kΩ to 7kΩ. Measured from +3V to -3V, or
-3V to +3V
RL= 3kΩ measured
from +3.3V to -3.3V
or -3.3V to +3.3V
2500pF || 3kΩ load,
Figure 1
CL= 150pF,
SHDN
= VCCFigure 2
CL= 150pF,
SHDN
= GND
Figure 2
CL= 2500pF 0.22 3.1
CL= 1000pF 0.22 2.1
t
PHLT
t
PLHT
t
ET
t
DT
t
PHLR
t
PLHR
t
PHLS
t
PLHS
t
ER
t
DR
230.4 280.0 kbits/sec
4 6 30 V/µs
900 1700
1000 1700
100 250
250 500
3000 4000
2000 3000
MAX562
µs
ns
ns
ns
_______________________________________________________________________________________ 3
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