NSC DS34C87T

DS34C87T
CMOS Quad TRISTATE Differential Line Driver
General Description
Features
The DS34C87T is a quad differential line driver designed for
digital data transmission over balanced lines. The
DS34C87T meets all the requirements of EIA standard
RS-422 while retaining the low power characteristics of
CMOS. This enables the construction of serial and terminal
interfaces while maintaining minimal power consumption.
The DS34C87T accepts TTL or CMOS input levels and
translates these to RS-422 output levels. This part uses special output circuitry that enables the individual drivers to
power down without loading down the bus. This device has
separate enable circuitry for each pair of the four drivers.
The DS34C87T is pin compatible to the DS3487T.
All inputs are protected against damage due to electrostatic
discharge by diodes to VCC and ground.
n
n
n
n
n
n
n
n
n
TTL input compatible
Typical propagation delays: 6 ns
Typical output skew: 0.5 ns
Outputs won’t load line when VCC = 0V
Meets the requirements of EIA standard RS-422
Operation from single 5V supply
TRI-STATE outputs for connection to system buses
Low quiescent current
Available in surface mount
Connection and Logic Diagrams
Dual-In-Line Package
DS008576-2
Truth Table
Input
DS008576-1
Top View
Order Number DS34C87TM or DS34C87TN
See NS Package Number M16A or N16E
Control
Non-Inverting
Inverting
Input
Output
Output
H
H
H
L
L
H
L
H
X
L
Z
Z
L = Low logic state
H = High logic state
X = Irrelevant
Z = TRI-STATE (high performance)
TRI-STATE ® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS008576
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DS34C87T CMOS Quad TRI-STATE™ Differential Line Driver
May 1998
Absolute Maximum Ratings (Notes 1, 2)
Plastic “N” Package
1736 mW
SOIC Package
1226 mW
Lead Temperature (TL)
(Soldering 4 sec)
260˚C
This device does not meet 2000V ESD rating. (Note 12)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
DC Voltage (VIN)
−0.5 to 7.0V
−1.5 to VCC
+1.5V
−0.5 to 7V
± 20 mA
Operating Conditions
DC Output Voltage (VOUT )
Clamp Diode Current (IIK , IOK)
DC Output Current, per pin (I
± 150 mA
OUT)
± 150 mA
DC VCC or GND Current (ICC)
Storage Temperature Range (T
STG)
−65˚C to +150˚C
Maximum Power Dissipation (PD) @ 25˚C (Note 3)
DC Electrical Characteristics
Supply Voltage (VCC)
DC Input or Output Voltage (VIN, VOUT)
Operating Temperature Range (TA)
DS34C87T
Input Rise or Fall Times (tr, tf)
Min
4.50
0
Max
5.50
VCC
Units
V
V
−40
+85
500
˚C
ns
(Note 4)
VCC = 5V ± 10% (unless otherwise specified)
Symbol
Parameter
Conditions
High Level Input
VIH
Min
Typ
Max
Units
2.0
V
Voltage
VIL
Low Level Input
0.8
V
Voltage
VOH
VOL
VT
|VT|–| V T|
High Level Output
V
Voltage
I
V
I
R
(Note 5)
R L = 100 Ω
Common Mode
OS|
Difference In
Common Mode Output
IIN
Input Current
ICC
Quiescent Supply
Current
IOZ
TRI-STATE ™ Output
Leakage Current
ISC
IOFF
3.4
0.3
= 100 Ω
Differential Output
Difference In
2.5
IN
Voltage
Output Voltage
|VOS– V
= VIH or VIL,
= −20 mA
= VIH or VIL,
OUT = 48 mA
Low Level Output
Voltage
Differential Output
VOS
IN
V
OUT
L
2.0
(Note 5)
R L = 100 Ω
3.1
2.0
(Note 5)
R L = 100 Ω
(Note 5)
V IN = VCC, GND, VIH, or VIL
I OUT = 0 µA,
= VCC or GND
= 2.4V or 0.5V (Note 6)
V OUT = VCC or GND
Control = VIL
0.5
V
V
0.4
V
3.0
V
0.4
V
± 1.0
µA
V
IN
200
500
µA
V
IN
0.8
2.0
mA
± 0.5
± 5.0
µA
−150
mA
= VCC or GND
Output Short
V
Circuit Current
Power Off Output
(Notes 5, 7)
VCC = 0V
Leakage Current
(Note 5)
IN
−30
VOUT = 6V
VOUT = −0.25V
100
−100
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device
should be operated at these limits. The table of “Electrical Characteristics” provide conditions for actual device operation.
Note 2: Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive; all currents out of device pins are negative.
Note 3: Ratings apply to ambient temperature at 25˚C. Above this temperature derate N Package 13.89 mW/˚C, and M Package 9.80 mW/˚C.
Note 4: Unless otherwise specified, min/max limits apply across the −40˚C to 85˚C temperature range. All typicals are given for VCC = 5V and TA = 25˚C.
Note 5: See EIA Specification RS-422 for exact test conditions.
Note 6: Measured per input. All other inputs at VCC or GND.
Note 7: This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted.
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2
Switching Characteristics (Note 4)
VCC = 5V ± 10%, t r, tf ≤ 6 ns (Figures 1, 2, 3, 4)
Symbol
tPLH, tPHL
Parameter
Propagation Delay
Typ
Max
Units
S1 Open
Conditions
Min
6
11
ns
Input to Output
Skew
(Note 8)
S1 Open
0.5
3
ns
tTLH, tTHL
Differential Output Rise
S1 Open
6
10
ns
ns
And Fall Times
tPZH
Output Enable Time
S1 Closed
12
25
tPZL
Output Enable Time
S1 Closed
13
26
ns
tPHZ
Output Disable Time (Note 9)
S1 Closed
4
8
ns
tPLZ
Output Disable Time (Note 9)
S1 Closed
6
12
CPD
Power Dissipation
ns
100
pF
6
pF
Capacitance (Note 10)
CIN
Input Capacitance
Note 8: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point.
Note 9: Output disable time is the delay from the control input being switched to the output transistors turning off. The actual disable times are less than indicated
due to the delay added by the RC time constant of the load.
Note 10: CPD determines the no load dynamic power consumption, PD = CPD V2CC f + ICC VCC, and the no load dynamic current consumption, IS = CPD VCC f +
ICC.
Comparison Table of Switching Characteristics into “LS-Type” Load(Note
11)
VCC = 5V, TA = +25˚C, tr ≤ 6 ns, tf ≤ 6 ns (Figures 4, 5, 6, 7, 8, 9)
Symbol
tPLH, tPHL
Parameter
Conditions
Propagation Delay
DS34C87
DS3487
Units
Typ
Max
Typ
Max
6
10
10
15
ns
1.5
2.0
4
7
10
15
ns
Input to Output
Skew
(Note 8)
tTHL, tTLH
Differential Output Rise
ns
and Fall Times
tPHZ
tPLZ
Output Disable Time
CL = 50 pF, RL = 200Ω,
8
11
17
25
ns
(Note 9)
S1 Closed, S2 Closed
CL = 50 pF, RL = 200Ω,
7
10
15
25
ns
Output Enable Time
S1 Closed, S2 Closed
CL = 50 pF, RL = ∞,
11
19
11
25
ns
Output Enable Time
S1 Open, S2 Closed
CL = 50 pF, RL = 200Ω,
14
21
15
25
ns
Output Disable Time
(Note 9)
tPZH
tPZL
S1 Closed, S2 Open
Note 11: This table is provided for comparison purposes only. The values in this table for the DS34C87 reflect the performance of the device but are not tested or
guaranteed.
Note 12: ESD Rating: HBM (1.5 kΩ, 100 pF)
Inputs ≥ 1500V
Outputs ≥ 1000V
EIAJ (0Ω, 200 pF)
All Pins ≥ 350V
3
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AC Test Circuit and Switching Time Waveforms
DS008576-3
Note: C1 = C2 = C3 = 40 pF (including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3 = 500Ω
FIGURE 1. AC Test Circuit
DS008576-8
FIGURE 5. Propagation Delays Test Circuit
for “LS-Type” Load
DS008576-4
FIGURE 2. Propagation Delays
DS008576-6
FIGURE 6. Differential Rise and Fall Times
Test Circuit for “LS-Type” Load
DS008576-5
FIGURE 3. Enable and Disable Times
DS008576-9
DS008576-7
FIGURE 7. Load Enable and Disable Times
Test Circuit for “LS-Type” Load
Input pulse; f = 1 MHz, 50%, tr ≤ 6 ns, tf ≤ 6 ns
FIGURE 4. Differential Rise and Fall Times
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4
AC Test Circuit and Switching Time Waveforms
(Continued)
DS008576-10
FIGURE 8. Load Propagation Delays for “LS-Type” Load
DS008576-11
FIGURE 9. Load Enable and Disable Times for “LS-Type” Load
Typical Applications
DS008576-12
*RT is optional although highly recommended to reduce reflection.
5
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Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Molded Package
Small Outline (M)
Order Number DS34C87TM
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DS34C87TN
NS Package Number N16E
7
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DS34C87T CMOS Quad TRI-STATE™ Differential Line Driver
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ure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
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