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)
INPUT
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
VCC
Input
VCC
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
PACKAGE
TA
≤
25
°
C
DERATING FACTOR
TA = 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, VCC
4.75
5
5.25
V
High-level input voltage, VIH
2
V
Low-level input voltage, VIL
0.8
V
Operating free-air temperature, TA
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
VIK
Input clamp voltage
II = – 18 mA
– 1.5
V
VOH
High-level output voltage
VIL = 0.8 V,
VIH = 2 V,
IOH = – 20 mA
2.5
V
VOL
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
∆
|VOD|
Change in magnitude of
RL = 100
Ω
See Figure 1
±
0 4
V
∆
|VOD|
g
g
differential output voltage†
RL = 100
Ω
,
See Figure 1
±
0.4
V
VOC
Common-mode output voltage‡
RL = 100
Ω
,
See Figure 1
3
V
∆
|VOC|
Change in magnitude of
RL = 100
Ω
See Figure 1
±
0 4
V
∆
|VOC|
g
g
common-mode output voltage†
RL = 100
Ω
,
See Figure 1
±
0.4
V
IO
Output current with power off
VCC = 0
VO = 6 V
100
µ
A
IO
Output current with power off
VCC = 0
VO = – 0.25 V
– 100
µ
A
IOZ
High impedance state output current
Output enables at 0 8 V
VO = 2.7 V
100
µ
A
IOZ
High-impedance-state output current
Output enables at 0.8 V
VO = 0.5 V
– 100
µ
A
II
Input current at maximum input volt-
age
VI = 5.5 V
100
µ
A
IIH
High-level input current
VI = 2.7 V
50
µ
A
IIL
Low-level input current
VI = 0.5 V
– 400
µ
A
IOS
Short-circuit output current §
VI = 2 V
– 40
– 140
mA
ICC
Supply current (all drivers)
Outputs disabled
105
mA
ICC
Supply 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 , V
CC
= 5 V
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
tPLH
Propagation delay time, low- to high-level output
20
ns
tPHL
Propagation delay time, high- to low-level output
CL = 15 pF,
See Figure 2
20
ns
Skew time
6
ns
tt(OD)
Differential-output transition time
CL = 15 pF,
See Figure 3
20
ns
tPZH
Output enable time to high level
30
ns
tPZL
Output enable time to low level
CL = 50 pF
See Figure 4
30
ns
tPHZ
Output disable time from high level
CL = 50 F,
See Figure 4
25
ns
tPLZ
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
VOD
50
Ω
50
Ω
VOC
Figure 1. Differential and Common-Mode Output Voltages
Skew
tPLH
Generator
(see Note A)
50
Ω
3 V
SW1
200
Ω
5 V
Y Output
Z Output
Input
See Note C
1.5 V
tPHL
1.5 V
VOH
VOL
VOLTAGE WAVEFORMS
3 V
0 V
VOL
VOH
Skew
1.5 V
1.5 V
1.5 V
1.5 V
TEST CIRCUIT
tPHL
ÏÏ
tPLH
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
CL
3 V
50
Ω
Output
RL = 100
Ω
Input
Output
tt(OD)
3 V
0 V
90%
10%
tt(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
tPLZ
1 k
Ω
tPHZ
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
VOL
VOH
TEST CIRCUIT
tPZL
tPZH
SW1 Closed
SW2 Open
SW2 Closed
SW1 Open
Output
Output
3 V
0 V
0.5 V
0.5 V
VOH
SW2 Closed
SW1 Closed
≈
1.5 V
≈
1.5 V
SW2 Closed
SW1 Closed
VOL
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
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright
1998, Texas Instruments Incorporated