DS34C87T
DS34C87T CMOS Quad TRI-STATE Differential Line Driver
Literature Number: SNLS376A
DS34C87T
CMOS Quad TRI-STATE Differential Line Driver
General Description
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 V
CC
and ground.
Features
nTTL input compatible
nTypical propagation delays: 6 ns
nTypical output skew: 0.5 ns
nOutputs won’t load line when V
CC
=0V
nMeets the requirements of EIA standard RS-422
nOperation from single 5V supply
nTRI-STATE outputs for connection to system buses
nLow quiescent current
nAvailable in surface mount
Connection and Logic Diagrams
Dual-In-Line Package
00857601
See Pin Description Table for details
Top View
Order Number DS34C87TM or DS34C87TN
See NS Package Number M16A or N16E
00857602
Truth Table
Input Control Non-Inverting Inverting
Input Output Output
HH H L
LH L H
XL Z Z
L = Low logic state
H = High logic state
X = Irrelevant
Z = TRI-STATE (high performance)
April 2002
DS34C87T CMOS Quad TRI-STATE Differential Line Driver
© 2002 National Semiconductor Corporation DS008576 www.national.com
Absolute Maximum Ratings (Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5 to 7.0V
DC Voltage (V
IN
) −1.5 to V
CC
+1.5V
DC Output Voltage (V
OUT
) −0.5 to 7V
Clamp Diode Current (I
IK
,I
OK
)±20 mA
DC Output Current, per pin (I
OUT
)±150 mA
DC V
CC
or GND Current (I
CC
)±150 mA
Storage Temperature Range (T
STG
)−65˚C to
+150˚C
Maximum Power Dissipation (P
D
)@25˚C (Note
3)
Plastic “N” Package 1736 mW
SOIC Package 1226 mW
Lead Temperature (T
L
)
(Soldering 4 sec) 260˚C
This device does not meet 2000V ESD rating. (Note 12)
Operating Conditions
Min Max Units
Supply Voltage (V
CC
) 4.50 5.50 V
DC Input or Output Voltage (V
IN
,V
OUT
)0V
CC
V
Operating Temperature Range (T
A
)
DS34C87T −40 +85 ˚C
Input Rise or Fall Times (t
r
,t
f
) 500 ns
DC Electrical Characteristics (Note 4)
V
CC
=5V±
10% (unless otherwise specified)
Symbol Parameter Conditions Min Typ Max Units
V
IH
High Level Input 2.0 V
Voltage
V
IL
Low Level Input 0.8 V
Voltage
V
OH
High Level Output V
IN
=V
IH
or V
IL
, 2.5 3.4 V
Voltage I
OUT
= −20 mA
V
OL
Low Level Output V
IN
=V
IH
or V
IL
, 0.3 0.5 V
Voltage I
OUT
=48mA
V
T
Differential Output R
L
= 100 Ω2.0 3.1 V
Voltage (Note 5)
|V
T
|–| V
T
|Difference In R
L
= 100 Ω0.4 V
Differential Output (Note 5)
V
OS
Common Mode R
L
= 100 Ω2.0 3.0 V
Output Voltage (Note 5)
|V
OS
–V
OS
| Difference In R
L
= 100 Ω0.4 V
Common Mode Output (Note 5)
I
IN
Input Current V
IN
=V
CC
, GND, V
IH
,orV
IL
±1.0 µA
I
CC
Quiescent Supply I
OUT
= 0 µA,
Current V
IN
=V
CC
or GND 200 500 µA
V
IN
= 2.4V or 0.5V (Note 6) 0.8 2.0 mA
I
OZ
TRI-STATE ™Output V
OUT
=V
CC
or GND ±0.5 ±5.0 µA
Leakage Current Control = V
IL
I
SC
Output Short V
IN
=V
CC
or GND −30 −150 mA
Circuit Current (Notes 5, 7)
I
OFF
Power Off Output V
CC
=0V V
OUT
= 6V 100 µA
Leakage Current (Note 5) V
OUT
= −0.25V −100 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.
DS34C87T
www.national.com 2
DC Electrical Characteristics (Note 4) (Continued)
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.
Switching Characteristics (Note 4)
V
CC
=5V±
10%, t
r
,t
f
≤6ns(
Figures 1, 2, 3, 4
)
Symbol Parameter Conditions Min Typ Max Units
t
PLH
,t
PHL
Propagation Delay S1 Open 6 11 ns
Input to Output
Skew (Note 8) S1 Open 0.5 3 ns
t
TLH
,t
THL
Differential Output Rise S1 Open 6 10 ns
And Fall Times
t
PZH
Output Enable Time S1 Closed 12 25 ns
t
PZL
Output Enable Time S1 Closed 13 26 ns
t
PHZ
Output Disable Time (Note 9) S1 Closed 4 8 ns
t
PLZ
Output Disable Time (Note 9) S1 Closed 6 12 ns
C
PD
Power Dissipation 100 pF
Capacitance (Note 10)
C
IN
Input Capacitance 6 pF
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=C
PD V2CCf+I
CC VCC, and the no load dynamic current consumption, IS=C
PD VCC f
+I
CC.
Comparison Table of Switching Characteristics into “LS-Type” Load(Note 11)
V
CC
= 5V, T
A
= +25˚C, t
r
≤6 ns, t
f
≤6ns(
Figures 4, 5, 6, 7, 8, 9
)
Symbol Parameter Conditions DS34C87 DS3487 Units
Typ Max Typ Max
t
PLH
,t
PHL
Propagation Delay 6 10 10 15 ns
Input to Output
Skew (Note 8) 1.5 2.0 ns
t
THL
,t
TLH
Differential Output Rise 4 7 10 15 ns
and Fall Times
t
PHZ
Output Disable Time C
L
= 50 pF, R
L
= 200Ω, 8 11 17 25 ns
(Note 9) S1 Closed, S2 Closed
t
PLZ
Output Disable Time C
L
= 50 pF, R
L
= 200Ω, 7 10 15 25 ns
(Note 9) S1 Closed, S2 Closed
t
PZH
Output Enable Time C
L
= 50 pF, R
L
=∞, 11191125 ns
S1 Open, S2 Closed
t
PZL
Output Enable Time C
L
= 50 pF, R
L
= 200Ω, 14211525 ns
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
DS34C87T
www.national.com3
AC Test Circuit and Switching Time Waveforms
00857603
Note: C1 = C2 = C3 = 40 pF (including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3 = 500Ω
FIGURE 1. AC Test Circuit
00857604
FIGURE 2. Propagation Delays
00857605
FIGURE 3. Enable and Disable Times
00857607
Input pulse; f = 1 MHz, 50%, tr≤6 ns, tf≤6ns
FIGURE 4. Differential Rise and Fall Times
00857608
FIGURE 5. Propagation Delays Test Circuit
for “LS-Type” Load
DS34C87T
www.national.com 4
AC Test Circuit and Switching
Time Waveforms (Continued)
Typical Applications
00857612
*RTis optional although highly recommended to reduce reflection.
00857606
FIGURE 6. Differential Rise and Fall Times
Test Circuit for “LS-Type” Load
00857609
FIGURE 7. Load Enable and Disable Times
Test Circuit for “LS-Type” Load
00857610
FIGURE 8. Load Propagation Delays for “LS-Type” Load
00857611
FIGURE 9. Load Enable and Disable Times for “LS-Type” Load
DS34C87T
www.national.com5
Pin Description Table
Pin Number
(DIP or SOP
package)
Pin Name Function
1 INPUT A Channel A - TTL/CMOS input
2 OUTPUT A - True True Output for Channel A,
RS422 Levels
3 OUTPUT A - Inverting Inverting Output for Channel A,
RS422 Levels
4 A/B CONTROL Enable Pin for Channels A and B,
Active High, TTL/CMOS Levels
5 OUTPUT B - Inverting Inverting Output for Channel B,
RS422 Levels
6 OUTPUT B - True True Output for Channel B,
RS422 Levels
7 INPUT B Channel B - TTL/CMOS input
8 GND Ground Pin (0 V)
9 INPUT C Channel C - TTL/CMOS input
10 OUTPUT C - True True Output for Channel C,
RS422 Levels
11 OUTPUT C - Inverting Inverting Output for Channel C,
RS422 Levels
12 C/D CONTROL Enable Pin for Channels C and D,
Active High, TTL/CMOS Levels
13 OUTPUT D - Inverting Inverting Output for Channel D,
RS422 Levels
14 OUTPUT D - True True Output for Channel D,
RS422 Levels
15 INPUT D Channel D - TTL/CMOS input
16 V
CC
Power Supply Pin, 5.0V typical
DS34C87T
www.national.com 6
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
DS34C87T
www.national.com7
Notes
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www.national.com
DS34C87T CMOS Quad TRI-STATE Differential Line Driver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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