MC1488
SEMICONDUCTOR
TECHNICAL DATA
QUAD MDTL LINE DRIVER
EIA232D
PIN CONNECTIONS
Order this document by MC1488/D
P SUFFIX
PLASTIC PACKAGE
CASE 646
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO14)
2
Output C
Input C2
Input C1
Output D
Input D2
VCC
14
Input D1
VEE
Input A
Output A
Input B1
Input B2
Gnd
Output B
8
9
10
11
12
13
7
5
3
4
1
6
1
MOTOROLA ANALOG IC DEVICE DATA
Quad Line Driver
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. EIA232D.
Features:
Current Limited Output
10 mA typical
PowerOff Source Impedance
300
mininum
Simple Slew Rate Control with External Capacitor
Flexible Operating Supply Range
Compatible with All Motorola MDTL and MTTL Logic Families
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC1488P
TA = 0 to + 75
C
Plastic
MC1488D
TA = 0 to + 75
C
SO14
Circuit Schematic
(1/4 of Circuit Shown)
GND 7
3.6 k
Pins 4, 9, 12 or 2
Input
Pins 5, 10, 13
Input
8.2 k
VCC 14
7.0 k
70
6.2 k
70
Output
300
10 k
VEE 1
Pins 6, 8, 11 or 3
MDTL Logic Output
Interconnecting
Cable
Interconnecting
Cable
MDTL Logic Input
Line Receiver
MC1489
Simplified Application
Line Driver
MC1488
Motorola, Inc. 1996
Rev 3
MC1488
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
(TA = + 25
C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Power Supply Voltage
VCC
VEE
+ 15
15
Vdc
Input Voltage Range
VIR
15
p
VIR
p
7.0
Vdc
Output Signal Voltage
VO
15
Vdc
Power Derating (Package Limitation, SO14
and Plastic DualInLine Package)
Derate above TA = + 25
C
PD
1/R
JA
1000
6.7
mW
mW/
C
Operating Ambient Temperature Range
TA
0 to + 75
C
Storage Temperature Range
Tstg
65 to + 175
C
ELECTRICAL CHARACTERISTICS
(VCC = + 9.0
1% Vdc, VEE = 9.0
1% Vdc, TA = 0 to 75
C, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Input Current Low Logic State (VIL = 0)
IIL
1.0
1.6
mA
Input Current High Logic State (VIH = 5.0 V)
IIH
10
A
Output Voltage High Logic State
(VIL = 0.8 Vdc, RL = 3.0 k
, VCC = + 9.0 Vdc, VEE = 9.0 Vdc)
(VIL = 0.8 Vdc, RL = 3.0 k
, VCC = + 13.2 Vdc, VEE = 13.2 Vdc)
VOH
+ 6.0
+ 9.0
+ 7.0
+ 10.5
Vdc
Output Voltage Low Logic State
(VIH = 1.9 Vdc, RL = 3.0 k
, VCC = + 9.0 Vdc, VEE = 9.0 Vdc)
(VIH = 1.9 Vdc, RL = 3.0 k
, VCC = + 13.2 Vdc, VEE = 13.2 Vdc)
VOL
6.0
9.0
7.0
10.5
Vdc
Positive Output ShortCircuit Current, Note 1
IOS +
+ 6.0
+ 10
+ 12
mA
Negative Output ShortCircuit Current, Note 1
IOS
6.0
10
12
mA
Output Resistance (VCC = VEE = 0,
VO
=
2.0 V)
ro
300
Ohms
Positive Supply Current (RI =
)
(VIH = 1.9 Vdc, VCC = + 9.0 Vdc)
(VIL = 0.8 Vdc, VCC = + 9.0 Vdc)
(VIH = 1.9 Vdc, VCC = + 12 Vdc)
(VIL = 0.8 Vdc, VCC = + 12 Vdc)
(VIH = 1.9 Vdc, VCC = + 15 Vdc)
(VIL = 0.8 Vdc, VCC = + 15 Vdc)
ICC
+ 15
+ 4.5
+ 19
+ 5.5
+ 20
+ 6.0
+ 25
+ 7.0
+ 34
+ 12
mA
Negative Supply Current (RL =
)
(VIH = 1.9 Vdc, VEE = 9.0 Vdc)
(VIL = 0.8 Vdc, VEE = 9.0 Vdc)
(VIH = 1.9 Vdc, VEE = 12 Vdc)
(VIL = 0.8 Vdc, VEE = 12 Vdc)
(VIH = 1.9 Vdc, VEE = 15 Vdc)
(VIL = 0.8 Vdc, VEE = 15 Vdc)
IEE
13
18
17
500
23
500
34
2.5
mA
A
mA
A
mA
mA
Power Consumption
(VCC = 9.0 Vdc, VEE = 9.0 Vdc)
(VCC = 12 Vdc, VEE = 12 Vdc)
PC
333
576
mW
SWITCHING CHARACTERISTICS
(VCC = + 9.0
1% Vdc, VEE = 9.0
1% Vdc, TA = + 25
C.)
Propagation Delay Time (zI = 3.0 k and 15 pF)
tPLH
275
350
ns
Fall Time
(zI = 3.0 k and 15 pF)
tTHL
45
75
ns
Propagation Delay Time (zI = 3.0 k and 15 pF)
tPHL
110
175
ns
Rise Time
(zI = 3.0 k and 15 pF)
tTLH
55
100
ns
NOTE: 1. Maximum Package Power Dissipation may be exceeded if all outputs are shorted simultaneously.
MC1488
3
MOTOROLA ANALOG IC DEVICE DATA
CHARACTERISTIC DEFINITIONS
Figure 1. Input Current
Figure 2. Output Voltage
Figure 3. Output ShortCircuit Current
Figure 4. Output Resistance (Power Off)
Figure 5. Power Supply Currents
Figure 6. Switching Response
10
13
9
4
12
5
1
2
14
9.0 V
5.0 V
IIH
IIL
9.0 V
7
1.9 V
7
VOL
9.0 V
VOH
0.8 V
VOL
3.0 k
VOH
14
1
9.0 V
2
4
9
12
3
6
8
11
9
2
14
4
5
IOS +
1
11
6
8
13
9
4
12
3
1
6.6 mA Max
3
7
8
6
11
0.8 V
2
1.9 V
14
VEE
VCC
7
10
12
IOS
VO
2.0 Vdc
IOS
tTHL and tTLH Measured 10% to 90%
VO
15 pF
3.0 k
50%
tPHL
tPLH
tTLH
tTHL
ein
0 V
3.0 V
1.5 V
ein
VO
ICC
VIL
2
VCC
1
14
7
12
4
9
IEE
VEE
1.9 V
VIH
0.8 V
MC1488
4
MOTOROLA ANALOG IC DEVICE DATA
TYPICAL CHARACTERISTICS
(TA = +25
C, unless otherwise noted.)
2.0
1.8
1.6
1.4
1.2
0.4
0.2
0.6
0.8
1.0
9.0
3.0
0
3.0
6.0
12
9.0
12
6.0
0
VCC = VEE =
12 V
Vin, INPUT VOLTAGE (V)
V , OUTPUT
VOL
T
AGE
(V)
O
VCC = VEE =
9.0 V
VCC = VEE =
6.0 V
Figure 7. Transfer Characteristics
versus Power Supply Voltage
VI
VO
3.0 k
IOS
12
9.0
6.0
3.0
0
3.0
6.0
9.0
12
125
IOS +
75
55
0
25
T, TEMPERATURE (
C)
I , SHOR
T
CIRCUIT
OUTPUT
CURRENT
(mA)
SC
Figure 8. Short Circuit Output Current
versus Temperature
VEE = 9.0 V
0.8 V
VI
1.9 V
VCC = 9.0 V
1000
1.0
100
10,000
1,000
CL, CAPACITANCE (pF)
10
10
100
1.0
SLEW RA
TE
(V/
s)
Figure 9. Output Slew Rate
versus Load Capacitance
VI
VO
CL
12
0
4.0
8.0
12
16
20
4.0
8.0
16
16
12
8.0
12
4.0
4.0
16
8.0
20
0
3.0 k
LOAD LINE
VO, OUTPUT VOLTAGE (V)
I , OUTPUT
CURRENT
(mA)
O
VO
IOS
1.9 V
VCC = VEE =
9.0 V
0.8 V
VI
+
Figure 10. Output Voltage and
CurrentLimiting Characteristics
25
4.0
6.0
8.0
10
12
14
55
125
75
2.0
0
16
T, TEMPERATURE (
C)
V , V , POWER SUPPL
Y
VOL
T
AGE
(V)
CC
EE
0
VEE
1
3.0 k
3.0 k
3.0 k
3.0 k
14
VCC
8
6
3
11
7
Figure 11. Maximum Operating Temperature
versus Power Supply Voltage
MC1488
5
MOTOROLA ANALOG IC DEVICE DATA
APPLICATIONS INFORMATION
The Electronic Industries Association EIA232D 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 EIA232D defined
levels. The EIA232D requirements as applied to drivers are
discussed herein.
The required driver voltages are defined as between 5.0 and 15 V
in magnitude and are positive for a Logic "0" and negative for a Logic
"1." These voltages are so defined when the drivers are terminated
with a 3000 to 7000
resistor. The MC1488 meets this voltage
requirement by converting a DTL/TTL logic level into EIA232D
levels with one stage of inversion.
The EIA232D specification further requires that during transitions,
the driver output slew rate must not exceed 30 V per microsecond.
The inherent slew rate of the MC1488 is much too fast for this
requirement. The current limited output of the device can be used to
control this slew rate by connecting a capacitor to each driver output.
The required capacitor can be easily determined by using the
relationship C = IOS x
T/
V from which Figure 12 is derived.
Accordingly, a 330 pF capacitor on each output will guarantee a
worst case slew rate of 30 V per microsecond.
1000
10
100
1.0
10
333 pF
30 V/
s
Figure 12. Slew Rate versus Capacitance
for ISC = 10 mA
C, CAPACITANCE (pF)
10,000
100
1,000
1.0
SLEW RA
TE
(V/
s)
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., VCC
q
9.0 V; VEE
p
9.0 V). In some power supply designs, a loss of
system power causes a low impedance on the power supply outputs.
When this occurs, a low impedance to ground would exist at the
power inputs to the MC1488 effectively shorting the 300
output
resistors to ground. If all four outputs were then shorted 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 in the earlier Standard EIA232B.) The
addition of the diodes also permits the MC1488 to withstand faults
with power supplies of less than the 9.0 V stated above.
Figure 13. Power Supply Protection
to Meet Power Off Fault Conditions
VCC
14
MC1488
VEE
7
MC1488
14
MC1488
14
7
1
1
7
1
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
define the output voltage levels independent of power supplies and
can be accomplished by diode clamping of the output pins. Figure 14
shows 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 is used to reduce the output voltage below the
300 mV above ground MOS input level limit.
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 can vary from a minimum
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 the minimum specified 15 V. The MC1488
will drive the output to within 2.0 V of the positive or negative supplies
as long as the current output limits are not exceeded. The combination
of the current limiting and supply voltage features allow a wide
combination of possible outputs within the same quad package. Thus
if only a portion of the four drivers are used for driving EIA232D
lines, the remainder could be used for DTL to MOS or even DTL to
DTL translation. Figure 15 shows one such combination.
MC1488
6
MOTOROLA ANALOG IC DEVICE DATA
Figure 14. MDTL/MTTLtoMOS Translator
Figure 15. Logic Translator Applications
MOS Output
(with VSS = GND)
10 k
1.0 k
MDTL
MTTL
Input
1/4 MC1488
12 V
12 V
12 V
MOS Output
10 V to 0 V
MDTL Output
0.7 V to + 5.7 V
MHTL Output
0.7 V to 10 V
MRTL Output
0.7 V to + 3.7 V
12 V
10 k
1.0 k
5.0 V
8
1
11
6
3.0 V
3
MC1488
13
12
10
9
5
4
MDTL
MMOS
Input
MDTL
MHTL
Input
2
MDTL
NAND
Gate
Input
MDTL
Input
12 V
14
7
MC1488
7
MOTOROLA ANALOG IC DEVICE DATA
OUTLINE DIMENSIONS
NOTES:
1. LEADS WITHIN 0.13 (0.005) RADIUS OF TRUE
POSITION AT SEATING PLANE AT MAXIMUM
MATERIAL CONDITION.
2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
3. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
4. ROUNDED CORNERS OPTIONAL.
1
7
14
8
B
A
F
H
G
D
K
C
N
L
J
M
SEATING
PLANE
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
0.715
0.770
18.16
19.56
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
0.300 BSC
7.62 BSC
M
0
10 0 10
N
0.015
0.039
0.39
1.01
_
_
_
_
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.
A
B
G
P
7 PL
14
8
7
1
M
0.25 (0.010)
B
M
S
B
M
0.25 (0.010)
A
S
T
T
F
R
X 45
SEATING
PLANE
D
14 PL
K
C
J
M
_
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
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
_
_
_
_
P SUFFIX
PLASTIC PACKAGE
CASE 64606
ISSUE L
D SUFFIX
PLASTIC PACKAGE
CASE 751A03
(SO14)
ISSUE F
MC1488
8
MOTOROLA ANALOG IC DEVICE DATA
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