T
C
ON Semiconductor
Quad Line Driver
MC1488
The MC1488 is a monolithic quad line driver designed to interface
data terminal equipment with data communications equipment in
conformance with the specifications of EIA Standard No. EIA–232D.
Features:
• Current Limited Output
±10 mA typical
• Power–Off Source Impedance
300 Ω minimum
• Simple Slew Rate Control with External Capacitor
• Flexible Operating Supply Range
• Compatible with All ON Semiconductor MDTL and MTTL Logic
Families
ORDERING INFORMATION
Operating
Device
MC1488P
MC1488D
Line Driver
MC1488
Temperature Range
= 0 to + 75°
A
°
Simplified Application
Interconnecting
Cable
Package
Plastic
SO–14
Line Receiver
MC1489
QUAD MDTL LINE DRIVER
EIA–232D
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 646
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
PIN CONNECTIONS
V
Input A
Output A
1
EE
2
3
14
13
12
V
CC
Input D1
Input D2
MDTL Logic Input
V
14
CC
Pins 4, 9, 12 or 2
Input
Input
Pins 5, 10, 13
GND 7
1
V
EE
Interconnecting
Cable
8.2 k
10 k
MDTL Logic Output
Circuit Schematic
(1/4 of Circuit Shown)
6.2 k
3.6 k
70
7.0 k 70
Input B1
Input B2
Output B
Gnd
Output
11
10
9
8
Output D
Input C1
Input C2
Output C
4
5
6
7
300
Pins 6, 8, 11 or 3
Semiconductor Components Industries, LLC, 2001
May, 2001 – Rev. 4
1 Publication Order Number:
MC1488/D
MC1488
MAXIMUM RATINGS (T
= +25°C, unless otherwise noted.)
A
Rating
Power Supply Voltage V
Input Voltage Range V
Output Signal Voltage V
Power Derating (Package Limitation, SO–14
and Plastic Dual–In–Line Package)
Derate above T
= + 25°C
A
Operating Ambient Temperature Range T
Storage Temperature Range T
ELECTRICAL CHARACTERISTICS (V
Characteristic
Input Current – Low Logic State (VIL = 0) I
Input Current – High Logic State (VIH = 5.0 V) I
Output Voltage – High Logic State
(V
= 0.8 Vdc, RL = 3.0 kΩ, VCC = + 9.0 Vdc, VEE = – 9.0 Vdc)
IL
= 0.8 Vdc, RL = 3.0 kΩ, VCC = + 13.2 Vdc, VEE = – 13.2 Vdc)
(V
IL
Output Voltage – Low Logic State
(V
= 1.9 Vdc, RL = 3.0 kΩ, VCC = + 9.0 Vdc, VEE = – 9.0 Vdc)
IH
= 1.9 Vdc, RL = 3.0 kΩ, VCC = + 13.2 Vdc, VEE = – 13.2 Vdc)
(V
IH
Positive Output Short–Circuit Current, Note 1 I
Negative Output Short–Circuit Current, Note 1 I
Output Resistance (VCC = VEE = 0, VO = ± 2.0 V) r
Positive Supply Current (RI = ∞)
(V
= 1.9 Vdc, VCC = + 9.0 Vdc)
IH
= 0.8 Vdc, VCC = + 9.0 Vdc)
(V
IL
= 1.9 Vdc, VCC = + 12 Vdc)
(V
IH
(V
= 0.8 Vdc, VCC = + 12 Vdc)
IL
= 1.9 Vdc, VCC = + 15 Vdc)
(V
IH
(V
= 0.8 Vdc, VCC = + 15 Vdc)
IL
Negative Supply Current (RL = ∞)
(V
= 1.9 Vdc, VEE = – 9.0 Vdc)
IH
= 0.8 Vdc, VEE = – 9.0 Vdc)
(V
IL
(V
= 1.9 Vdc, VEE = – 12 Vdc)
IH
= 0.8 Vdc, VEE = – 12 Vdc)
(V
IL
= 1.9 Vdc, VEE = – 15 Vdc)
(V
IH
(V
= 0.8 Vdc, VEE = – 15 Vdc)
IL
Power Consumption
(V
= 9.0 Vdc, VEE = – 9.0 Vdc)
CC
= 12 Vdc, VEE = – 12 Vdc)
(V
CC
SWITCHING CHARACTERISTICS (V
Propagation Delay Time (zI = 3.0 k and 15 pF) t
Fall Time (zI = 3.0 k and 15 pF) t
Propagation Delay Time (zI = 3.0 k and 15 pF) t
Rise Time (zI = 3.0 k and 15 pF) t
NOTE: 1. Maximum Package Power Dissipation may be exceeded if all outputs are shorted simultaneously.
= + 9.0 ± 1% Vdc, VEE = –9.0 ± 1% Vdc, TA = 0 to 75°C, unless otherwise noted.)
CC
Symbol Min Typ Max Unit
IL
IH
V
OH
– 1.0 1.6 mA
– – 10 µA
+ 6.0
+ 9.0
V
OL
– 6.0
– 9.0
OS+
OS–
o
I
CC
+ 6.0 + 10 + 12 mA
– 6.0 – 10 – 12 mA
300 – – Ohms
–
–
–
–
–
–
I
EE
–
–
–
–
–
–
P
C
–
–
= +9.0 ± 1% Vdc, VEE = –9.0 ± 1% Vdc, TA = +25°C.)
CC
PLH
THL
PHL
TLH
– 275 350 ns
– 45 75 ns
– 110 175 ns
– 55 100 ns
Symbol Value Unit
CC
V
EE
IR
+ 15
– 15
– 15 VIR
Vdc
Vdc
7.0
±15 Vdc
1000
6.7
mW
mW/°C
0 to + 75 °C
– 65 to + 175 °C
1/R
O
P
D
θ
JA
A
stg
Vdc
+7.0
+10.5
–
–
Vdc
– 7.0
– 10.5
–
–
mA
+ 15
+ 4.5
+ 19
+ 5.5
–
–
– 13
–
– 18
–
–
–
+ 20
+ 6.0
+ 25
+ 7.0
+ 34
+ 12
– 17
– 500
– 23
– 500
– 34
– 2.5
mA
µA
mA
µA
mA
mA
mW
–
–
333
576
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2
9.0 V
MC1488
CHARACTERISTIC DEFINITIONS
-9.0 V
1
14
1.9 V
9.0 V
-9.0 V
14 1
2
4
9
12
7
I
IL
I
IH
5
V
10
OL
V
OH
13
0.8 V
2
4
9
12
3
6
3.0 k
8
11
V
7
OH
V
OL
5.0 V
Figure 1. Input Current Figure 2. Output Voltage
V
V
EE
CC
14
1.9 V
2
I
OS+
I
OS-
4
9
12
1
3
6
I
±
OS
8
11
14
2
4
5
9
10
1
7
3
6
8
V
O
± 2.0 Vdc
± 6.6 mA Max
11
13
12
0.8 V
7
Figure 3. Output Short–Circuit Current Figure 4. Output Resistance (Power Off)
V
CC
e
I
1.9 V
2
V
IH
V
IL
4
9
12
0.8 V
CC
14
7
1
I
EE
V
EE
in
15 pF3.0 k
3.0 V
1.5 V
e
in
V
O
t
PHL
t
PLH
50%
t
THL
t
and t
THL
Measured 10% to 90%
TLH
t
TLH
Figure 5. Power Supply Currents Figure 6. Switching Response
V
O
0 V
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MC1488
TYPICAL CHARACTERISTICS
= +25°C, unless otherwise noted.)
(T
A
12
9.0
6.0
3.0
-3.0
-6.0
O
V , OUTPUT VOLTAGE (V)
V
I
0
3.0 k
V
O
-9.0
-12
0
Vin, INPUT VOLTAGE (V)
Figure 7. Transfer Characteristics
versus Power Supply Voltage
1000
100
10
V
SLEW RATE (V/s)µ
I
1.0
1.0 100 10,0001,000
10
C
V
O
C
L
, CAPACITANCE (pF)
L
Figure 9. Output Slew Rate
versus Load Capacitance
VCC = V
VCC = V
VCC = V
= ± 12 V
EE
EE
EE
= ± 9.0 V
= ± 6.0 V
12
9.0
I
OS+
6.0
V
3.0
-3.0
1.9 V
0
V
I
0.8 V
= 9.0 V
CC
VEE = 9.0 V
-6.0
I
-9.0
-12
SC
2.01.81.61.41.20.40.2 0.6 0.8 1.0
I , SHORT CIRCUIT OUTPUT CURRENT (mA)
OS-
75-55 0 25
125
T, TEMPERATURE (°C)
Figure 8. Short Circuit Output Current
versus Temperature
20
12
8.0
3.0 kΩ LOAD LINE
4.0
0
-4.0
1.9 V
-8.0
O
I , OUTPUT CURRENT (mA)
-12
-16
-20
0.8 V
V
I
VCC = V
I
OS
+
= ± 9.0V
EE
-
0
V
, OUTPUT VOLTAGE (V)
O
V
O
16-16 -12 -8.0 12-4.0 4.0168.0
Figure 10. Output Voltage and
Current–Limiting Characteristics
16
14
V
CC
12
10
8.0
6.0
4.0
EE
2.0
CC
V , V , POWER SUPPLY VOLTAGE (V)
0
14
3.0 k
3
3.0 k
6
3.0 k
8
3.0 k
11
7
1
V
EE
25
-55 12575
0
T, TEMPERATURE (°C)
Figure 11. Maximum Operating Temperature
versus Power Supply Voltage
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MC1488
APPLICATIONS INFORMATION
The Electronic Industries Association EIA–232D
specification details the requirements for the interface
between data processing equipment and data
communications equipment. This standard specifies not
only the number and type of interface leads, but also the
voltage levels to be used. The MC1488 quad driver and its
companion circuit, the MC1489 quad receiver, provide a
complete interface system between DTL or TTL logic levels
and the EIA–232D defined levels. The EIA–232D
requirements as applied to drivers are discussed herein.
The required driver voltages are defined as between
5.0 and 1 5 V in magnitude and are positive for a L ogic “0”
and negative f or a Logic “ 1.” T hese voltages are so defined
when the drivers are terminated with a 3000 to 7000 Ω
resistor. The MC1488 meets this voltage requirement by
converting a DTL/TTL logic level into EIA–232D levels
with one stage of inversion.
The EIA–232D specification further requires that
during transitions, the driver output slew rate must not
exceed 30 V per microsecond. The i nherent s lew r ate of the
MC1488 is m uch too fast for this requirement. The current
limited output of the d evice c an be used t o c ontrol t his slew
rate by connecting a capacitor to each driver output. The
required capacitor can be easily determined by using the
relationship C = I
x ∆T/∆V from which Figure 12 is
OS
derived. Accordingly, a 330 pF capacitor on each output
will guarantee a worst case slew rate of 30 V per
microsecond.
power supply d esigns, a loss of system power causes a low
impedance on the power s upply outputs. When t his o ccurs,
a low i mpedance to ground would exist at the power inputs
to the MC1488 effectively shorting the 300 Ω output
resistors to ground. If all four outputs
were then s horted to
plus or minus 15 V, the power dissipation in these resistors
would be excessive. Therefore, if the system is designed to
permit low impedances to ground at the power supplies of
the drivers, a diode should be placed in each power supply
lead to prevent overheating in this fault condition. These two
diodes, as shown in Figure 13, could be used to decouple all
the driver packages in a system. (These same diodes will
allow the MC1488 to withstand momentary shorts to the
±25 V limits specified i n the earlier Standard EIA–232B.)
The addition of the diodes also permits the MC1488 to
withstand faults with power supplies of less t han the 9.0 V
stated above.
V
CC
14
MC1488
MC1488
14
14
MC1488
1000
100
30 V/µs
10
SLEW RATE (V/s)µ
333 pF
1.0
Figure 12. Slew Rate versus Capacitance
10
C, CAPACITANCE (pF)
for I
SC
= 10 mA
10,000100 1,0001.0
The interface driver is also required to withstand an
accidental short to any other conductor in an
interconnecting cable. The worst possible signal on any
conductor would be another driver using a plus or minus
15 V, 500 mA source. The MC1488 is designed to
indefinitely withstand such a short to all four outputs in a
package as long as the power supply voltages are greater
than 9.0 V (i.e., V
9.0 V; VEE – 9.0 V). In some
CC
V
7
EE
Figure 13. Power Supply Protection
to Meet Power Off Fault Conditions
71 171
The maximum short circuit current allowable under
fault conditions is more than guaranteed by the previously
mentioned 10 mA output current limiting.
Other Applications
The MC1488 is an extremely versatile line driver with
a myriad of possible applications. Several features of the
drivers enhance this versatility:
1. Output Current Limiting – this enables the circuit
designer to d efine t he output voltage levels independent of
power supplies and can be accomplished by diode
clamping of the output pins. Figure 14 s hows the MC1488
used as a DTL to MOS translator where the high level
voltage output is clamped one diode above ground. The
resistor divider shown i s used to reduce the o utput voltage
below the 300 mV above ground MOS input level limit.
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MC1488
2. Power Supply Range – as can be seen from the
schematic drawing of the drivers, the positive and negative
driving elements of the device are essentially independent
and do not require matching power supplies. In fact, the
positive supply c an v ary f rom a m inimum 7 .0 V (required for
driving the negative pulldown section) to the maximum
specified 15 V. The negative supply can vary from
approximately – 2.5 V to t he minimum s pecified – 15 V. The
12 V
MDTL
MTTL
Input
1/4 MC1488
1.0 k
10 k
MOS Output
(with V
SS
= GND)
MC1488 will drive the output to within 2.0 V o f the p ositive
or negative s upplies a s l ong a s t he c urrent o utput l imits a re n ot
exceeded. The c ombination o f t he c urrent l imiting a nd s upply
voltage features allow a w ide c ombination o f p ossible outputs
within the same quad package. Thus if only a portion of the
four drivers are used for driving EIA–232D lines, the
remainder could be used for DTL to MOS or even DTL to
DTL translation. Figure 15 shows one such combination.
MDTL
Input
MDTL
NAND
Gate
Input
MDTL
MHTL
Input
MDTL
MMOS
Input
2
4
5
MC1488
9
10
12
13
1
3
6
8
11
147
3.0 V
5.0 V
1.0 k
10 k
MRTL Output
-0.7 V to +3.7 V
MDTL Output
-0.7 V to +5.7 V
MHTL Output
-0.7 V to 10 V
MOS Output
-10 V to 0 V
-12 V-12 V
-12 V
12 V
Figure 14. MDTL/MTTL–to–MOS Translator Figure 15. Logic Translator Applications
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MC1488
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 646–06
ISSUE M
14 8
B
17
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
–T–
SEATING
PLANE
–T–
SEATING
PLANE
N
HG
–A–
14 8
G
D 14 PL
0.25 (0.010) A
A
F
L
C
D
14 PL
0.13 (0.005)
K
J
M
M
DIM MIN MAX MIN MAX
A 0.715 0.770 18.16 18.80
B 0.240 0.260 6.10 6.60
C 0.145 0.185 3.69 4.69
D 0.015 0.021 0.38 0.53
F 0.040 0.070 1.02 1.78
G 0.100 BSC 2.54 BSC
H 0.052 0.095 1.32 2.41
J 0.008 0.015 0.20 0.38
K 0.115 0.135 2.92 3.43
L
0.290 0.310 7.37 7.87
M --- 10 --- 10
N 0.015 0.039 0.38 1.01
MILLIMETERSINCHES
D SUFFIX
PLASTIC PACKAGE
CASE 751A–03
(SO–14)
ISSUE F
–B–
P
7 PL
M
71
0.25 (0.010) B
C
R
X 45
K
M
S
B
T
S
M
M
J
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
F
DIM MIN MAX MIN MAX
A 8.55 8.75 0.337 0.344
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC 0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 5.80 6.20 0.228 0.244
R 0.25 0.50 0.010 0.019
INCHESMILLIMETERS
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MC1488
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MC1488/D
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