MAX1488E Datasheet by Maxim Integrated

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[MAXI/VI D {>w E )vman 1 E31 % 4 G E 353 mm. mm. :@ j E E: L L E j lVI/JXIIVI
_______________General Description
The MAX1488E quad, low-power line driver is designed
for EIA/TIA-232, EIA/TIA-562, and CCITT V.28 commu-
nications in harsh environments. Each transmitter out-
put is protected against ±15kV electrostatic discharge
(ESD) shocks. The inputs are TTL and CMOS compati-
ble with minimal loading. The outputs feature internally
controlled slew-rate limiting and current limiting. This
device has a guaranteed 120kbps data rate. Power-
supply current is less than 180µA over a ±4.5V to
±13.2V supply voltage range.
The MAX1488E is pin compatible with the MC1488,
MC14C88, SN75188, SN75C188, DS1488, and
DS14C88. It is available in 14-pin plastic DIP and SO
packages.
________________________Applications
PC Motherboards
Modems
Interface Data Terminal Equipment (DTE) with
Data Circuit-Terminating Equipment (DCE)
Equipment Meeting IEC1000-4-2
(formerly IEC801-2) or ±15kV ESD Protection
____________________________Features
ESD Protection:
±15kV—Human Body Model
±6kV—IEC801-2, Contact Discharge
±15kV—IEC801-2, Air-Gap Discharge
Latchup Free, Even During an ESD Event
Low 85µA Supply Current from IEE or ICC
Guaranteed 120kbps Data Rate
No External Capacitors Required for Slew-Rate
Limiting
Pin Compatible with MC1488, MC14C88, SN75188,
SN75C188, DS1488, and DS14C88
MAX1488E
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
________________________________________________________________
Maxim Integrated Products
1
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VCC
INPUT D1
INPUT D2
OUTPUT D
INPUT C1
INPUT C2
OUTPUT C
VEE
INPUT A
OUTPUT A
INPUT B1
INPUT B2
OUTPUT B
GND
TOP VIEW
MAX1488E
DIP/SO
__________________Pin Configuration
INTERCONNECTING
CABLE
SIGNAL GROUND
TTL/CMOS
LOGIC
PC
MOTHERBOARD
(DTE)
MODEM
(DCE)
TTL/CMOS
LOGIC
1
4
MAX1488E
1
4
MAX1489E
1
4
MAX1489E
1
4
MAX1488E
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-2403; Rev 0; 8/95
PART
MAX1488ECPD
MAX1488ECSD
MAX1488EC/D 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
14 Plastic DIP
14 SO
Dice*
______________Ordering Information
* Dice are specified at T
A
= +25°C.
MAX1488EEPD
MAX1488EESD -40°C to +85°C
-40°C to +85°C 14 Plastic DIP
14 SO
[MAXI/VI
MAX1488E
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = 4.5V to 13.2V, VEE = -4.5V to -13.2V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +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.
Positive Supply Voltage (VCC).............................................+14V
Negative Supply Voltage (VEE).............................................-14V
Input Voltage (VIN) .................................................-0.3V to +15V
Driver Output Voltage..........................................................±15V
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 10.00mW/°C above +70°C) ..........800mW
SO (derate 8.7mW/°C above +70°C)...........................695mW
Operating Temperature Ranges
MAX1488EC_D ...................................................0°C to +70°C
MAX1488EE_D ................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Output shorted to ground (Note 1)
No load
VCC = VEE = 0V
I
VO
I
2.0V
No load
CONDITIONS
300RO
Output Resistance
µA2I
IN1
Input Current
V0.8VIL
Input Low Voltage
V2.0VIH
Input High Voltage
mA±4 ±20 ±45IOS
Output Short-Circuit Current
µA-180 -85IEE
Negative Supply Current
4.5 13.2VCC V
-13.2 -4.5VEE
Operating Voltage Range
µA85 180ICC
Positive Supply Current
UNITSMIN TYP MAXSYMBOLPARAMETER
VCC = -VEE = 5.0V, RL= 3k
V
3.7 4.0
VOH
Output Voltage High
VCC = 12.0V, VEE = -12.0V, CL= 50pF
VCC = 9.0V, VEE = -9.0V, CL= 50pF
VCC = 4.5V, VEE = -4.5V, CL= 50pF
µs
3.1 4.2
tPLH 2.8 3.9
2.4 3.5
VCC = 12.0V, VEE = -12.0V, CL= 50pF
VCC = 9.0V, VEE = -9.0V, CL= 50pF
VCC = 4.5V, VEE = -4.5V, CL= 50pF
µs
2.6 5.4
tPHL 2.4 5.1
2.1 4.5
Output Propagation Delay,
Low to High
Output Propagation Delay,
High to Low
VCC = 12.0V, VEE = -12.0V, CL= 50pF
VCC = 9.0V, VEE = -9.0V, CL= 50pF
VCC = 4.5V, VEE = -4.5V, CL= 50pF
µs
0.42
tSK 0.42
0.25
Propagation Delay Skew,
I
tPLH - tPHL
I
ESD CHARACTERISTICS
±15Human Body Model
IEC-1000-4-2 (Contact Discharge) ±6
IEC-1000-4-2 (Air-Gap Discharge)
kV
±15
ESD Protection
DC CHARACTERISTICS
TIMING CHARACTERISTICS (see Figure 1)
Output Voltage Low VOL V
-4.5 -3.7
10 10.5
5 5.4
13.2
-10.8 -10
-5.8 -5
-13.2
VCC = -VEE = 5.0V, RL= 3k
VCC = -VEE = 13.2V, RL= open
VCC = -VEE = 13.2V, RL= open
VCC = -VEE = 12.0V, RL= 3k
VCC = -VEE = 6.5V, RL= 3k
VCC = -VEE = 12.0V, RL= 3k
VCC = -VEE = 6.5V, RL= 3k
awswim M m: llfl/JXIIVI
MAX1488E
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
_______________________________________________________________________________________ 3
Note 1: The IOS value is for one output at a time. If more than one output is shorted simultaneously, damage may occur.
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 4.5V to 13.2V, VEE = -4.5V to -13.2V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
CL= 1500pF, RL= 5k,
VOUTPUT_ from -3.3V to 3.3V 850tR1
CL= 15pF to 2500pF, RL= 3kto 7k,
VCC = 12V, VEE = -12V, TA= +25°C
CL= 15pF to 2500pF, RL= 3kto 7k,
VCC = 12V, VEE = -12V, TA= +25°C,
VOUTPUT_ from -3.0V to 3.0V
CL= 1500pF, RL= 5k,
VOUTPUT_ from -3.0V to 3.0V
CL= 1500pF, RL= 5k,
VOUTPUT_ from -3.3V to 3.3V
CL= 1500pF, RL= 5k,
VOUTPUT_ from -3.0V to 3.0V
CONDITIONS
kbps120Guaranteed Data Rate
V/µs430SROutput Slew Rate
ns
765tF2
Output Fall Time 860tF1
ns
740tR2
Output Rise Time
UNITSMIN TYP MAXSYMBOLPARAMETER
__________________________________________Typical Operating Characteristics
(VCC = 12V, VEE = -12V, TA = +25°C, unless otherwise noted.)
15
10
-15 4
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
5
MAX1488E TOC-1
VCC AND -VEE SUPPLIES (V)
OUTPUT VOLTAGE (V)
10
-5
-10
68 14
0
1251179 13
V
OH RL= 3k
RL= 3k
RL= 5k
RL= 5k
VOL
9
8
11
10
30
SLEW RATE vs.
LOAD CAPACITANCE
7
MAX1488E TOC-2
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
1500
5
4
500 1000
6
25002000 3000
RISING EDGE
FALLING EDGE
RL= 3k15
10
-15 -40
OUTPUT VOLTAGE
vs. TEMPERATURE
5
MAX1488E TOC-3
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
20
-5
-10
-20 0 100
0
6040 80
VOH @ VCC = -VEE = 12V
VOH @ VCC = -VEE = 4.5V
VOL @ VCC = -VEE = 4.5V
VOL @ VCC = -VEE = 12V
RL= 3k
MAX1488E
_______________Detailed Description
The MAX1488E provides ±15kV of ESD protection when
operating or when powered down. After an ESD event,
the MAX1488E will not latch up. Internal slew-rate-limit-
ing circuitry eliminates the need for external capacitors.
The MAX1488E has a guaranteed 120kbps data rate.
Outputs
Tables 1 and 2 describe the output states. The output
voltage level is affected by both the load current and
supply voltage, and is stable over temperature. Refer to
the
Typical Operating Characteristics
to see how the
output voltage varies with supply voltage, load capaci-
tance, and temperature.
Table 1. Driver A Functions
Table 2. Driver B–D Functions
Inputs
The driver inputs determine the driver output states
(Tables 1 and 2). Driver inputs B, C, and D have two
inputs. Connect unused inputs to ground or VCC.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX1488E driver outputs have extra
protection against static electricity found in normal
operation. Maxim’s engineers developed state-of-the-
art structures to protect these pins against ESD of
±15kV, without damage. After an ESD event, the
MAX1488E keeps working without latchup.
ESD protection can be tested in various ways; the
transmitter outputs are characterized for protection to
the following:
1) ±15kV using the Human Body Model
2) ±6kV using the Contact-Discharge Method specified
in IEC1000-4-2 (formerly IEC801-2)
3)±15kV using the Air-Gap Method specified in
IEC1000-4-2 (formerly IEC801-2).
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kresistor.
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
4 _______________________________________________________________________________________
_____________________Pin Description
NAME FUNCTION
1 VEE -4.5V to -13.2V Supply Voltage Input
2, 4, 5, 9,
10, 12, 13 INPUT_ Driver Inputs
PIN
3, 6, 8, 11 OUTPUT_ Driver Outputs
7 GND Ground
14 VCC +4.5V to +13.2V Supply Voltage Input
tF2
tF1
TPHL TPLH
tR1
tR2
1.5V
3.0V
0V
0V
DRIVER
INPUT
VOUT
VOH
VOL
3.3V
3.0V
-3.0V
-3.3V
RLCL
SIGNAL
GENERATOR
Figure 1. Slew-Rate Test Circuit and Timing Diagram
INPUT A OUTPUTA
HL
LH
INPUT_1 INPUT_2 OUTPUT_
HHL
LXH
XLH
llfl/JXIIVI
IEC1000-4-2
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX1488E helps you
design equipment that meets Level 4 (the highest level)
of IEC1000-4-2, without additional ESD-protection com-
ponents.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2. Because series resistance is
lower in the IEC1000-4-2 ESD test model (Figure 3a),
the ESD withstand voltage measured to this standard is
generally lower than that measured using the Human
Body Model. Figure 3b shows the current waveform for
the ±6kV IEC1000-4-2 Level 4 ESD Contact-Discharge
test.
The Air-Gap test involves approaching the device with
a charged probe. The Contact-Discharge method con-
nects the probe to the device before the probe is ener-
gized.
Machine Model
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. Its objec-
tive is to mimic the stress caused by contact that
occurs with handling and assembly during manufactur-
ing. Of course, all pins (not just RS-232 inputs and out-
puts) require this protection during manufacturing.
Therefore, the Machine Model is less relevant to the I/O
ports than the Human Body Model and IEC1000-4-2.
__________Applications Information
Use proper layout to ensure other devices on your
board are not damaged in an ESD strike. Currents as
high as 60A can instantaneously pass into the ground,
so it is important to minimize the ground-lead return
path to the power supply. A separate return path to the
power supply is recommended. Trace widths should be
greater than 40 mils. VCC and VEE must be bypassed
with 0.1µF capacitors as close to the part as possible to
ensure maximum ESD protection.
MAX1488E
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
_______________________________________________________________________________________ 5
CHARGE-CURRENT
LIMIT RESISTOR DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC 1M RD 1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 2a. Human Body ESD Test Model
IP 100%
90%
36.8%
tRL TIMEtDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
00
AMPERES
Figure 2b. Human Body Model Current Waveform
CHARGE-CURRENT
LIMIT RESISTOR DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC 50M to 100M RD 330
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 3a. IEC1000-4-2 ESD Test Model
tr = 0.7ns to 1ns 30ns 60ns
t
100%
90%
10%
IPEAK
I
Figure 3b. IEC1000-4-2 ESD Generator Current Waveform
MAXIIVI
MAX1488E
___________________Chip Topography
TRANSISTOR COUNT: 95
SUBSTRATE CONNECTED TO GND
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
6 _______________________________________________________________________________________
INPUT D1
INPUT B1
INPUT B2
OUTPUT B
0.134"
(3.40mm)
0.070"
(1.78mm)
GND
INPUT D2
OUTPUT D
INPUT C1
INPUT C2
OUTPUT C
VSS VDD
OUTPUT A
INPUT A
LJL /L j ‘ J L” llfl/JXIIVI
MAX1488E
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
_______________________________________________________________________________________ 7
________________________________________________________Package Information
DIM
A
A1
B
C
E
e
H
L
MIN
0.053
0.004
0.014
0.007
0.150
0.228
0.016
MAX
0.069
0.010
0.019
0.010
0.157
0.244
0.050
MIN
1.35
0.10
0.35
0.19
3.80
5.80
0.40
MAX
1.75
0.25
0.49
0.25
4.00
6.20
1.27
INCHES MILLIMETERS
21-0041A
Narrow SO
SMALL-OUTLINE
PACKAGE
(0.150 in.)
DIM
D
D
D
MIN
0.189
0.337
0.386
MAX
0.197
0.344
0.394
MIN
4.80
8.55
9.80
MAX
5.00
8.75
10.00
INCHES MILLIMETERS
PINS
8
14
16
1.270.050
L
0°-8°
HE
D
e
A
A1 C
0.101mm
0.004in.
B
+H+ E mm) a 325 762 225 ea, own mus MAXI/Ill
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
MAX1488E
±15kV ESD-Protected, Quad, Low-Power
RS-232 Line Driver
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
___________________________________________Package Information (continued)
DIM
A
A1
A2
A3
B
B1
C
D1
E
E1
e
eA
eB
L
MIN
–
0.015
0.125
0.055
0.016
0.045
0.008
0.005
0.300
0.240
0.100
0.300
0.115
MAX
0.200
–
0.175
0.080
0.022
0.065
0.012
0.080
0.325
0.310
–
–
0.400
0.150
MIN
–
0.38
3.18
1.40
0.41
1.14
0.20
0.13
7.62
6.10
2.54
7.62
2.92
MAX
5.08
–
4.45
2.03
0.56
1.65
0.30
2.03
8.26
7.87
–
–
10.16
3.81
INCHES MILLIMETERS
Plastic DIP
PLASTIC
DUAL-IN-LINE
PACKAGE
(0.300 in.)
DIM
D
D
D
D
D
D
PKG.
P
P
P
P
P
N
MIN
0.348
0.735
0.745
0.885
1.015
1.14
MAX
0.390
0.765
0.765
0.915
1.045
1.265
MIN
8.84
18.67
18.92
22.48
25.78
28.96
MAX
9.91
19.43
19.43
23.24
26.54
32.13
INCHES MILLIMETERS
PINS
8
14
16
18
20
24
C
AA2
E1
D
E
eA
eB
A3
B1
B
0° - 15°
A1
L
D1
e
21-0043A

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