MC3487
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS098A – MAY 1980 – REVISED MAY 1995
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds Requirements of ANSI
EIA/TIA-422-B and ITU
Recommendation V.11
D
3-State, TTL-Compatible Outputs
D
Fast Transition Times
D
High-Impedance Inputs
D
Single 5-V Supply
D
Power-Up and Power-Down Protection
D
Designed to Be Interchangeable With
Motorola MC3487
description
The MC3487 offers four independent differential line drivers designed to meet the specifications of ANSI
EIA/TIA-422-B and ITU Recommendation V.11. Each driver has a TTL-compatible input buffered to reduce
current and minimize loading.
The driver outputs utilize 3-state circuitry to provide high-impedance states at any pair of differential outputs
when the appropriate output enable is at a low logic level. Internal circuitry is provided to ensure a
high-impedance state at the differential outputs during power-up and power-down transition times provided the
output enable is low. The outputs are capable of source or sink currents of 48 mA.
The MC3487 is designed for optimum performance when used with the MC3486 quadruple line receiver. It is
supplied in a 16-pin dual-in-line package and operates from a single 5-V supply.
The MC3487 is characterized for operation from 0°C to 70°C.
logic symbol
†
EN
EN
4Z
4Y
3Z
3Y
2Z
2Y
1Z
1Y
15
9
12
7
1
4
4A
3A
3,4EN
2A
1A
1,2EN
13
14
11
10
5
6
3
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram (positive logic)
4Z
4Y
3Z
3Y
2Z
2Y
1Z
1Y
15
9
12
7
1
4
4A
3A
3,4EN
2A
1A
1,2EN
13
14
11
10
5
6
3
2
Copyright 1995, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1A
1Y
1Z
1,2EN
2Z
2Y
2A
GND
V
CC
4A
4Y
4Z
3,4EN
3Z
3Y
3A
D OR N PACKAGE
(TOP VIEW)
MC3487
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS098A – MAY 1980 – REVISED MAY 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
(each driver)
OUTPUT
OUTPUTS
INPUT
ENABLE
Y Z
H H H L
L H L H
X L Z Z
H = TTL high level, L = TTL low level,
X = irrelevant, Z = High impedance
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
V
CC
Input
V
CC
9 Ω NOM
Output
TYPICAL OF ALL OUTPUTS
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 8 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage, V
O
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package 260°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 under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values, except differential output voltage, VOD, are with respect to the network ground terminal.
DISSIPATION RATING TABLE
T
≤ 25°C DERATING FACTOR T
= 70°C
PACKAGE
A
POWER RATING ABOVE TA = 25°C
A
POWER RATING
D 950 mW 7.6 mW/°C 608 mW
N 1150 mW 9.2 mW/°C 736 mW
MC3487
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS098A – MAY 1980 – REVISED MAY 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
2 V
Low-level input voltage, V
IL
0.8 V
Operating free-air temperature, T
A
0 70 °C
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN MAX UNIT
V
IK
Input clamp voltage II = –18 mA –1.5 V
V
OH
High-level output voltage VIL = 0.8 V, VIH = 2 V, IOH = –20 mA 2.5 V
V
OL
Low-level output voltage VIL = 0.8 V, VIH = 2 V, IOL = 48 mA 0.5 V
|VOD| Differential output voltage RL = 100 Ω, See Figure 1 2
Change in magnitude of
∆|VOD|
gg
differential output voltage
†
R
L
=
100 Ω
,
See Figure 1
±0.4
V
V
OC
Common-mode output voltage
‡
RL = 100 Ω, See Figure 1 3 V
Change in magnitude of
∆|VOC|
gg
common-mode output voltage
†
R
L
=
100 Ω
,
See Figure 1
±0.4
V
p
p
VO = 6 V 100
IOOutput current with power off
V
CC
=
0
VO = –0.25 V –100
µ
A
p
p
p
VO = 2.7 V 100
IOZHigh-impedance-state output current
Output enables at 0.8 V
VO = 0.5 V –100
µ
A
I
I
Input current at maximum input voltage
VI = 5.5 V 100 µA
I
IH
High-level input current VI = 2.7 V 50 µA
I
IL
Low-level input current VI = 0.5 V –400 µA
I
OS
Short-circuit output current
§
VI = 2 V –40 –140 mA
pp
Outputs disabled 105
ICCSupply current (all drivers)
Outputs enabled, No load 85
mA
†
∆ |VOD| and ∆ |VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low
level.
‡
In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage,
VOS.
§
Only one output at a time should be shorted, and duration of the short circuit should not exceed one second.
switching characteristics over recommended operating free-air temperature range , VCC = 5 V
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
PLH
Propagation delay time, low- to high-level output 20 ns
t
PHL
Propagation delay time, high- to low-level output CL = 15 pF, See Figure 2 20 ns
Skew time 6 ns
t
t(OD)
Differential-output transition time CL = 15 pF, See Figure 3 20 ns
t
PZH
Output enable time to high level 30 ns
t
PZL
Output enable time to low level
p
30 ns
t
PHZ
Output disable time from high level
C
L
= 50 F,
See Figure 4
25 ns
t
PLZ
Output disable time from low level 30 ns
MC3487
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS098A – MAY 1980 – REVISED MAY 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
V
OD
50 Ω
50 Ω
V
OC
Figure 1. Differential and Common-Mode Output Voltages
Skew
t
PLH
Generator
(see Note A)
50 Ω
3 V
SW1
200 Ω
5 V
Y Output
Z Output
Input
See Note C
1.5 V
t
PHL
1.5 V
V
OH
V
OL
VOLTAGE WAVEFORMS
3 V
0 V
V
OL
V
OH
Skew
1.5 V 1.5 V
1.5 V 1.5 V
TEST CIRCUIT
t
PHL
t
PLH
CL = 15 pF
(see Note B)
NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle = 50%,
ZO = 50 Ω.
B. CL includes probe and stray capacitance.
C. All diodes are 1N916 or 1N3064.
Figure 2. Test Circuit and Voltage Waveforms
C
L
3 V
50 Ω
Output
RL = 100 Ω
Input
Output
t
t(OD)
3 V
0 V
90%
10%
t
t(OD)
TEST CIRCUIT VOLTAGE WAVEFORMS
Generator
(see Note A)
CL = 15 pF
(see Note B)
NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle = 50%,
ZO = 50 Ω.
B. CL includes probe and stray capacitance.
Figure 3. Test Circuit and Voltage Waveforms
MC3487
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS098A – MAY 1980 – REVISED MAY 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
t
PLZ
1 kΩ
t
PHZ
VOLTAGE WAVEFORMS
50 Ω
0 V or 3 V
Output
See Note C
SW2
SW1
5 V
SW3
200 Ω
1.5 V
1.5 V
1.5 V
1.5 V
3 V
0 V
V
OL
V
OH
TEST CIRCUIT
t
PZL
t
PZH
SW1 Closed
SW2 Open
SW2 Closed
SW1 Open
Output
Output
3 V
0 V
0.5 V
0.5 V
V
OH
SW2 Closed
SW1 Closed
≈ 1.5 V
≈ 1.5 V
SW2 Closed
SW1 Closed
V
OL
Output
Enable Input
Generator
(see Note A)
CL = 15 pF
(see Note B)
Output
Output
Output
Enable Input
NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle = 50%,
ZO = 50 Ω.
B. CL includes probe and stray capacitance.
C. All diodes are 1N916 or 1N3064.
Figure 4. Driver Test Circuit and Voltage Waveforms
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