DS34C86T
DS34C86T Quad CMOS Differential Line Receiver
Literature Number: SNLS379B
DS34C86T
Quad CMOS Differential Line Receiver
General Description
The DS34C86T is a quad differential line receiver designed
to meet the RS-422, RS-423, and Federal Standards 1020
and 1030 for balanced and unbalanced digital data transmis-
sion, while retaining the low power characteristics of CMOS.
The DS34C86T has an input sensitivity of 200 mV over the
common mode input voltage range of ±7V. Hysteresis is
provided to improve noise margin and discourage output
instability for slowly changing input waveforms.
The DS34C86T features internal pull-up and pull-down re-
sistors which prevent output oscillation on unused channels.
Separate enable pins allow independent control of receiver
pairs. The TRI-STATE®outputs have 6 mA source and sink
capability. The DS34C86T is pin compatible with the
DS3486.
Features
nCMOS design for low power
n±0.2V sensitivity over the input common mode voltage
range
nTypical propagation delays: 19 ns
nTypical input hysteresis: 60 mV
nInputs won’t load line when V
CC
=0V
nMeets the requirements of EIA standard RS-422
nTRI-STATE outputs for system bus compatibility
nAvailable in surface mount
nOpen input Failsafe feature, output high for open input
Logic Diagram
00869901
Connection Diagram
Dual-In-Line Package
00869902
Top View
Order Number DS34C86TM, and DS34C86TN
See NS Package Number M16A and N16E
Truth Table
Enable Input Output
LXZ
HV
ID
≥V
TH
(Max) H
HV
ID
≤V
TH
(Min) L
H Open* H
*Open, not terminated
Z = TRI-STATE
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
June 1998
DS34C86T Quad CMOS Differential Line Receiver
© 2004 National Semiconductor Corporation DS008699 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
)7V
Input Common Mode Range (V
CM
)±14V
Differential Input Voltage (V
DIFF
)±14V
Enable Input Voltage (V
IN)
7V
Storage Temperature Range (T
STG
)
−65˚C to
+150˚C
Lead Temperature (Soldering 4
sec) 260˚C
Maximum Power Dissipation at 25˚C (Note 5)
Plastic “N” Package 1645 mW
SOIC Package 1190 mW
Current Per Output ±25 mA
This device does not meet 2000V ESD rating. (Note 4)
Operating Conditions
Min Max Unit
Supply Voltage (V
CC
) 4.50 5.50 V
Operating Temperature Range (T
A
) −40 +85 ˚C
Enable Input Rise or Fall Times 500 ns
DC Electrical Characteristics (Note 3)
V
CC
=5V±10% (unless otherwise specified)
Symbol Parameter Conditions Min Typ Max Units
V
TH
Minimum Differential V
OUT
=V
OH
or V
OL
−200 35 +200 mV
Input Voltage −7V <V
CM
<+7V
R
IN
Input Resistance V
IN
= −7V, +7V 5.0 6.8 10 kΩ
(Other Input = GND)
I
IN
Input Current V
IN
= +10V, Other Input = GND +1.1 +1.5 mA
(Under Test) V
IN
= −10V, Other Input = GND −2.0 −2.5 mA
V
OH
Minimum High Level V
CC
= Min., V
(DIFF)
= +1V 3.8 4.2 V
Output Voltage I
OUT
= −6.0 mA
V
OL
Maximum Low Level V
CC
= Max., V
(DIFF)
= −1V 0.2 0.3 V
Output Voltage I
OUT
= 6.0 mA
V
IH
Minimum Enable High 2.0 V
Input Level Voltage
V
IL
Maximum Enable Low 0.8 V
Input Level Voltage
I
OZ
Maximum TRI-STATE V
OUT
=V
CC
or GND,
Output Leakage Current TRI-STATE Control = V
IL
±0.5 ±5.0 µA
I
I
Maximum Enable Input V
IN
=V
CC
or GND ±1.0 µA
Current
I
CC
Quiescent Power V
CC
= Max., V
(DIFF)
= +1V 16 23 mA
Supply Current
V
HYST
Input Hysteresis V
CM
=0V 60 mV
AC Electrical Characteristics (Note 3)
V
CC
=5V±10% (unless otherwise specified) (Figures 1, 2, 3)
Symbol Parameter Conditions Min Typ Max Units
t
PLH
, Propagation Delay C
L
=50pF
t
PHL
Input to Output V
DIFF
= 2.5V 19 30 ns
V
CM
=0V
t
RISE
, Output Rise and C
L
=50pF
t
FALL
Fall Times V
DIFF
= 2.5V 4 9 ns
V
CM
=0V
t
PLZ
, Propagation Delay C
L
=50pF
t
PHZ
ENABLE to Output R
L
= 1000Ω13 18 ns
DS34C86T
www.national.com 2
AC Electrical Characteristics (Note 3) (Continued)
V
CC
=5V±10% (unless otherwise specified) (Figures 1, 2, 3)
Symbol Parameter Conditions Min Typ Max Units
V
DIFF
= 2.5V
t
PZL
, Propagation Delay C
L
=50pF
t
PZH
ENABLE to Output R
L
= 1000Ω13 21 ns
V
DIFF
= 2.5V
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” provides conditions for actual device operation.
Note 2: Unless otherwise specified, all voltages are referenced to ground.
Note 3: Unless otherwise specified, Min/Max limits apply across the operating temperature range.
All typicals are given for VCC = 5V and TA= 25˚C.
Note 4: ESD Rating; HBM (1.5kΩ, 100 pF)
Inputs ≥2000V
All other pins ≥1000V
EIAJ (0Ω, 200 pF) ≥350V
Note 5: Ratings apply to ambient temperature at 25˚C. Above this temperature derate N Package 13.16 mW/˚C, and M Package 9.52 mW/˚C.
Comparison Table of Switching Characteristics into “LS-Type” Load (Note 6)
V
CC
= 5V, T
A
= 25˚C (Figures 4, 5)
Symbol Parameter DS34C86 DS3486 Units
Typ Max Typ Max
t
PHL(D)
Propagation Delay Time 17 19 ns
Output High to Low
t
PLH(D)
Propagation Delay Time 19 19 ns
Output Low to High
t
PLZ
Output Low to TRI-STATE 13 23 ns
t
PHZ
Output High to TRI-STATE 12 25 ns
t
PZH
Output TRI-STATE to High 13 18 ns
t
PZL
Output TRI-STATE to Low 13 20 ns
Note 6: This Table is provided for comparison purposes only. The values in this table for the DS34C86 reflect the performance of the device but are not tested or
guaranteed.
Test and Switching Waveforms
00869903
FIGURE 1. Propagation Delays
DS34C86T
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Test and Switching Waveforms (Continued)
00869904
CLIncludes load and test jig capacitance.
S1=V
CC for tPZL, and tPLZ measurements.
S1 = GND for tPZH, and t PHZ measurements.
FIGURE 2. Test Circuit for TRI-STATE Output Tests
00869905
FIGURE 3. TRI-STATE Output Enable and Disable Waveforms
DS34C86T
www.national.com 4
AC Test Circuits and Switching Time Waveforms
00869908
1.5V for tPHZ and tPLZ
−1.5V for tPLZ and tPZL
Input Pulse Characteristics:
tTLH =t
THL = 6 ns (10% to 90%)
PRR = 1 MHz, 50% duty cycle
00869906
00869907
Input Pulse Characteristics:
tTLH =t
THL = 6 ns (10% to 90%)
PRR = 1 MHz, 50% duty cycle
FIGURE 4. Propagation Delay Differential Input to Output for “LS-Type” Load
DS34C86T
www.national.com5
AC Test Circuits and Switching Time Waveforms (Continued)
t
PLZ
00869909
t
PHZ
00869910
t
PZH
00869911
t
PZL
00869912
FIGURE 5. Propagation Delay TRI-STATE Control Unit to Output for “LS-Type” Load
DS34C86T
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Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Molded Small Outline Package (M)
Order Number DS34C86TM
NS Package Number M16A
16-Lead Dual-In-Line Package (N)
Order Number DS34C86TN
NS Package Number N16E
DS34C86T
www.national.com7
Notes
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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www.national.com
DS34C86T Quad CMOS Differential Line Receiver
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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