Datasheet MC1488M, MC1488MEL, MC1488ML1, MC1488DR2 Datasheet (MOTOROLA)



SEMICONDUCTOR

TECHNICAL DATA

QUAD MDTL LINE DRIVER

EIA–232D

PIN CONNECTIONS

Order this document by MC1488/D

P SUFFIX

PLASTIC PACKAGE

CASE 646

D SUFFIX

PLASTIC PACKAGE

CASE 751A

(SO–14)

2

Output C

Input C2

Input C1

Output D

Input D2

V

CC

14

Input D1

V

EE

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

  

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 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

°

Plastic

MC1488D

T

A

=

0 to

+

75°C

SO–14

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 (T

A

= +25°C, unless otherwise noted.)

Rating Symbol Value Unit

Power Supply Voltage V

CC

V

EE

+ 15
– 15

Vdc

Input Voltage Range V

IR

– 15 p VIR

p

7.0

Vdc

Output Signal Voltage V

O

±15 Vdc

Power Derating (Package Limitation, SO–14

and Plastic Dual–In–Line Package)
Derate above TA = + 25°C

P

D

1/R

θJA

1000

6.7

mW

mW/°C

Operating Ambient Temperature Range T

A

0 to + 75 °C

Storage Temperature Range T

stg

– 65 to + 175 °C

ELECTRICAL CHARACTERISTICS (V

CC

= + 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) I

IL

– 1.0 1.6 mA

Input Current – High Logic State (VIH = 5.0 V) I

IH

– – 10 µA

Output Voltage – High Logic State

(VIL = 0.8 Vdc, RL = 3.0 kΩ, VCC = + 9.0 Vdc, VEE = – 9.0 Vdc)
(VIL = 0.8 Vdc, RL = 3.0 kΩ, VCC = + 13.2 Vdc, VEE = – 13.2 Vdc)

V

OH

+ 6.0
+ 9.0

+7.0

+10.5

–
–

Vdc

Output Voltage – Low Logic State

(VIH = 1.9 Vdc, RL = 3.0 kΩ, VCC = + 9.0 Vdc, VEE = – 9.0 Vdc)
(VIH = 1.9 Vdc, RL = 3.0 kΩ, VCC = + 13.2 Vdc, VEE = – 13.2 Vdc)

V

OL

– 6.0
– 9.0

– 7.0

– 10.5

–
–

Vdc

Positive Output Short–Circuit Current, Note 1 I

OS+

+ 6.0 + 10 + 12 mA

Negative Output Short–Circuit Current, Note 1 I

OS–

– 6.0 – 10 – 12 mA

Output Resistance (VCC = VEE = 0, VO = ± 2.0 V) r

o

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)

I

CC

–
–
–
–
–
–

+ 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)

I

EE

–
–
–
–
–
–

– 13

–

– 18

–
–
–

– 17

– 500

– 23

– 500

– 34

– 2.5

mA

µA

mA

µA
mA
mA

Power Consumption

(VCC = 9.0 Vdc, VEE = – 9.0 Vdc)
(VCC = 12 Vdc, VEE = – 12 Vdc)

P

C

–
–

–
–

333
576

mW

SWITCHING CHARACTERISTICS (V

CC

= +9.0 ± 1% Vdc, VEE = –9.0 ± 1% Vdc, TA = +25°C.)

Propagation Delay Time (zI = 3.0 k and 15 pF) t

PLH

– 275 350 ns

Fall Time (zI = 3.0 k and 15 pF) t

THL

– 45 75 ns

Propagation Delay Time (zI = 3.0 k and 15 pF) t

PHL

– 110 175 ns

Rise Time (zI = 3.0 k and 15 pF) t

TLH

– 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 Short–Circuit 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

I

IH

I

IL

–9.0 V

7

1.9 V

7

V

OL

9.0 V

V

OH

0.8 V
V

OL

3.0 k

V

OH

14 1

–9.0 V

2

4

9

12

3

6

8

11

9

2

14

4
5

I

OS+

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

V

EE

V

CC

7

10

12

I

OS

±

V

O

±

2.0 Vdc

I

OS–

t

THL

and t

TLH

Measured 10% to 90%

V

O

15 pF3.0 k

50%

t

PHL

t

PLH

t

TLH

t

THL

e

in

0 V

3.0 V

1.5 V

e

in

V

O

I

CC

V

IL

2

V

CC

1

14

7

12

4

9

I

EE

V

EE

1.9 V

V

IH

0.8 V

MC1488

4

MOTOROLA ANALOG IC DEVICE DATA

TYPICAL CHARACTERISTICS

(TA = +25°C, unless otherwise noted.)

2.01.81.61.41.20.40.2 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 TAGE (V)

O

VCC = VEE = ± 9.0 V

VCC = VEE = ± 6.0 V

Figure 7. Transfer Characteristics

versus Power Supply Voltage

V

I

V

O

3.0 k

I

OS–

12

9.0

6.0

3.0
0

–3.0
–6.0

–9.0

–12

125

I

OS+

75–55 0 25

T, TEMPERATURE (

°

C)

I , SHORT CIRCUIT OUTPUT CURRENT (mA)

SC

Figure 8. Short Circuit Output Current

versus Temperature

VEE = 9.0 V

0.8 V

V

I

1.9 V

VCC = 9.0 V

1000

1.0 100 10,0001,000
CL, CAPACITANCE (pF)

10

10

100

1.0

SLEW RATE (V/ s)

µ

Figure 9. Output Slew Rate

versus Load Capacitance

V

I

V

O

C

L

12

0

–4.0

–8.0

–12
–16
–20

4.0

8.0

16–16 –12 –8.0 12–4.0 4.0168.0

20

0

3.0 kΩ LOAD LINE

VO, OUTPUT VOLTAGE (V)

I , OUTPUT CURRENT (mA)

O

V

O

I

OS

1.9 V

VCC = VEE = ± 9.0 V

0.8 V

V

I

+
–

Figure 10. Output Voltage and

Current–Limiting Characteristics

25

4.0

6.0

8.0

10

12

14

–55 12575

2.0
0

16

T, TEMPERATURE (

°

C)

V , V , POWER SUPPLY VOLTAGE (V)

CC

EE

0

V

EE

1

3.0 k

3.0 k

3.0 k

3.0 k

14

V

CC

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 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 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 Ω res istor. 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 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/µs

Figure 12. Slew Rate versus Capacitance

for ISC = 10 mA

C, CAPACITANCE (pF)

10,000100 1,0001.0

SLEW RATE (V/ s)

µ

The interface driver is also required to withstand an acc idental
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

CC

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 Ω output
resistors to ground. If all four outputs

were the n sh ort ed 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 EIA–232B.) 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

V

CC

14

MC1488

V

EE

7

MC1488

14

MC1488

14

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 circ uit 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 EIA–232D
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/MTTL–to–MOS 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

147

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.

17

14 8

B

A
F

HG D

K

C

N

L

J

M

SEATING
PLANE

DIM MIN MAX MIN MAX

MILLIMETERSINCHES

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

71

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

INCHESMILLIMETERS

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 646–06

ISSUE L

D SUFFIX

PLASTIC PACKAGE

CASE 751A–03

(SO–14)
ISSUE F

MC1488

8

MOTOROLA ANALOG IC DEVICE DATA

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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
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MC1488/D

*MC1488/D*

◊