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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. EIA-232D. Features: * Current Limited Output 10 mA typical * Power-Off Source Impedance 300 mininum * Simple Slew Rate Control with External Capacitor
MC1488
QUAD MDTL LINE DRIVER EIA-232D
SEMICONDUCTOR TECHNICAL DATA
* *
Flexible Operating Supply Range Compatible with All Motorola MDTL and MTTL Logic Families ORDERING INFORMATION
Device MC1488P MC1488D TA = 0 to + 75C Operating Temperature Range Package Plastic SO-14 D SUFFIX PLASTIC PACKAGE CASE 751A (SO-14) P SUFFIX PLASTIC PACKAGE CASE 646
PIN CONNECTIONS Simplified Application
Line Driver MC1488 Interconnecting Cable Line Receiver MC1489
VEE 1 Input A 2 Output A 3 Input B1 4 Input B2 5 Output B 6
14 VCC 13 Input D1 12 Input D2 11 Output D 10 Input C1 9 Input C2 8 Output C
MDTL Logic Input
Interconnecting Cable
MDTL Logic Output
Gnd 7
Circuit Schematic
(1/4 of Circuit Shown)
VCC 14 8.2 k Pins 4, 9, 12 or 2 Input Input Pins 5, 10, 13 6.2 k
70 300 Output Pins 6, 8, 11 or 3
3.6 k
GND 7
10 k 7.0 k VEE 1 70
(c) Motorola, Inc. 1996
Rev 3
MOTOROLA ANALOG IC DEVICE DATA
1
MC1488
MAXIMUM RATINGS (TA = + 25C, unless otherwise noted.)
Rating Power Supply Voltage Input Voltage Range Output Signal Voltage Power Derating (Package Limitation, SO-14 and Plastic Dual-In-Line Package) Derate above TA = + 25C Operating Ambient Temperature Range Storage Temperature Range Symbol VCC VEE VIR VO PD 1/RJA TA Tstg - 15 Value + 15 - 15 7.0 Unit Vdc Vdc Vdc mW mW/C C C
p VIR p
15 1000 6.7
0 to + 75 - 65 to + 175
ELECTRICAL CHARACTERISTICS (VCC = + 9.0 1% Vdc, VEE = - 9.0 1% Vdc, TA = 0 to 75C, unless otherwise noted.)
Characteristic Input Current - Low Logic State (VIL = 0) Input Current - High Logic State (VIH = 5.0 V) 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) 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) Positive Output Short-Circuit Current, Note 1 Negative Output Short-Circuit Current, Note 1 Output Resistance (VCC = VEE = 0, VO = 2.0 V) 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) 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) Power Consumption (VCC = 9.0 Vdc, VEE = - 9.0 Vdc) (VCC = 12 Vdc, VEE = - 12 Vdc) Symbol IIL IIH VOH + 6.0 + 9.0 VOL - 6.0 - 9.0 IOS + IOS - ro ICC - - - - - - IEE - - - - - - PC - - - - 333 576 - 13 - - 18 - - - - 17 - 500 - 23 - 500 - 34 - 2.5 mA A mA A mA mA mW + 15 + 4.5 + 19 + 5.5 - - + 20 + 6.0 + 25 + 7.0 + 34 + 12 + 6.0 - 6.0 300 - 7.0 - 10.5 + 10 - 10 - - - + 12 - 12 - mA mA Ohms mA + 7.0 + 10.5 - - Vdc Min - - Typ 1.0 - Max 1.6 10 Unit mA A Vdc
SWITCHING CHARACTERISTICS (VCC = + 9.0 1% Vdc, VEE = - 9.0 1% Vdc, TA = + 25C.)
Propagation Delay Time (zI = 3.0 k and 15 pF) Fall Time (zI = 3.0 k and 15 pF) tPLH tTHL tPHL tTLH - - - - 275 45 110 55 350 75 175 100 ns ns ns ns
Propagation Delay Time (zI = 3.0 k and 15 pF) Rise Time (zI = 3.0 k and 15 pF)
NOTE: 1. Maximum Package Power Dissipation may be exceeded if all outputs are shorted simultaneously.
2
MOTOROLA ANALOG IC DEVICE DATA
MC1488
CHARACTERISTIC DEFINITIONS Figure 1. Input Current
9.0 V 14 -9.0 V 1 1.9 V 2 4 9 13 12 0.8 V 7 IIL IIH 5.0 V 12 7 11 VOH VOL 5 10 VOL 4 VOH 9 6 8 2
Figure 2. Output Voltage
9.0 V 14 -9.0 V 1
3 3.0 k
Figure 3. Output Short-Circuit Current
VCC 14 VEE
Figure 4. Output Resistance (Power Off)
14 7 1
1.9 V 2 IOS + 4 9 12
1 2 3 6 8 10 11 7 12 13 IOS 4 6 5 8 9 11 3 VO 2.0 Vdc 6.6 mA Max
IOS -
0.8 V
Figure 5. Power Supply Currents
VCC ein 1.9 V 2 VIH 4 7 9 VIL 12 1 VO 0.8 V IEE ein ICC
Figure 6. Switching Response
VO 3.0 k 15 pF
14 3.0 V 1.5 V tPHL tPLH 50% tTHL tTHL and tTLH Measured 10% to 90% VEE tTLH 0V
MOTOROLA ANALOG IC DEVICE DATA
3
MC1488
TYPICAL CHARACTERISTICS (TA = +25C, unless otherwise noted.) Figure 7. Transfer Characteristics versus Power Supply Voltage
12 9.0 V O , OUTPUT VOLTAGE (V) 6.0 3.0 0 - 3.0 - 6.0 - 9.0 -12 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Vin, INPUT VOLTAGE (V) VI VO 3.0 k VCC = VEE = 12 V VCC = VEE = 9.0 V VCC = VEE = 6.0 V
I SC , SHORT CIRCUIT OUTPUT CURRENT (mA)
Figure 8. Short Circuit Output Current versus Temperature
12 9.0 6.0 3.0 0 - 3.0 - 6.0 - 9.0 -12 -55 0 25 T, TEMPERATURE (C) 75 125 IOS - 1.9 V VI 0.8 V VEE = 9.0 V VCC = 9.0 V IOS +
Figure 9. Output Slew Rate versus Load Capacitance
1000 IO, OUTPUT CURRENT (mA) 20 16 12 8.0 4.0 0 - 4.0 - 8.0 -12 1.9 V VI SLEW RATE (V/ s)
Figure 10. Output Voltage and Current-Limiting Characteristics
100
3.0 k LOAD LINE
10
VI CL
VO
IOS
1.0 1.0 10 100 CL, CAPACITANCE (pF) 1,000 10,000
+ VO -16 0.8 V VCC = VEE = 9.0 V - -20 -16 -12 -8.0 -4.0 0 4.0 VO, OUTPUT VOLTAGE (V)
8.0
12
16
Figure 11. Maximum Operating Temperature versus Power Supply Voltage
VCC, V EE, POWER SUPPLY VOLTAGE (V) 16 14 12 10 8.0 6.0 4.0 2.0 0 -55 7 1 VEE 0 25 75 125 T, TEMPERATURE (C) VCC 14 3 3.0 k 6 3.0 k 8 3.0 k 11 3.0 k
4
MOTOROLA ANALOG IC DEVICE DATA
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 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 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. 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
VCC 14 MC1488 14 MC1488 14 MC1488
1000
Figure 12. Slew Rate versus Capacitance for ISC = 10 mA
7 VEE
1
7
1
7
1
SLEW RATE (V/s)
100
30 V/s
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 EIA-232D lines, the remainder could be used for DTL to MOS or even DTL to DTL translation. Figure 15 shows one such combination.
10 333 pF 1.0 1.0
10
100 C, CAPACITANCE (pF)
1,000
10,000
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 9.0 V; VEE - 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
q
p
MOTOROLA ANALOG IC DEVICE DATA
5
MC1488
Figure 14. MDTL/MTTL-to-MOS Translator
12 V MDTL 2 Input 1/4 MC1488 MDTL MTTL Input MOS Output (with VSS = GND) 10 k MDTL 4 NAND Gate Input 5 9 MDTL MHTL Input 10 12 MDTL MMOS Input 13 1 6 3.0 V MDTL Output - 0.7 V to + 5.7 V 3 MRTL Output - 0.7 V to + 3.7 V
Figure 15. Logic Translator Applications
1.0 k
MC1488 8 5.0 V MHTL Output - 0.7 V to 10 V
- 12 V
- 12 V
11 1.0 k 10 k 7 14
MOS Output -10 V to 0 V
-12 V
12 V
6
MOTOROLA ANALOG IC DEVICE DATA
MC1488
OUTLINE DIMENSIONS
P SUFFIX PLASTIC PACKAGE CASE 646-06 ISSUE L
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. DIM A B C D F G H J K L M N INCHES MIN MAX 0.715 0.770 0.240 0.260 0.145 0.185 0.015 0.021 0.040 0.070 0.100 BSC 0.052 0.095 0.008 0.015 0.115 0.135 0.300 BSC 0_ 10_ 0.015 0.039 MILLIMETERS MIN MAX 18.16 19.56 6.10 6.60 3.69 4.69 0.38 0.53 1.02 1.78 2.54 BSC 1.32 2.41 0.20 0.38 2.92 3.43 7.62 BSC 0_ 10_ 0.39 1.01
14
8
B
1 7
A F C N H G D
SEATING PLANE
L
J K M
D SUFFIX PLASTIC PACKAGE CASE 751A-03 (SO-14) ISSUE F -A-
14 8 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.
-B-
1 7
P 7 PL 0.25 (0.010)
M
B
M
G C
R X 45 _
F
-T-
SEATING PLANE
D 14 PL 0.25 (0.010)
M
K TB
S
M A
S
J
DIM A B C D F G J K M P R
MILLIMETERS MIN MAX 8.55 8.75 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50
INCHES MIN MAX 0.337 0.344 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.228 0.244 0.010 0.019
MOTOROLA ANALOG IC DEVICE DATA
7
MC1488
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MOTOROLA ANALOG IC DEVICE DATA MC1488/D
*MC1488/D*

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