NSC DS36950VX, DS36950V Datasheet
DS36950
Quad Differential Bus Transceiver
General Description
The DS36950 is a low power, space-saving quad EIA-485
differential bus transceiver especially suited for high speed,
parallel, multipoint, computer I/O bus applications. A compact 20-pin surface mount PLCC package provides high
transceiver integration and a very small PC board footprint.
Timing uncertainty across an interface using multiple devices, a typical problem in a parallel interface, is
specified—minimum and maximum propagation delay
times are guaranteed.
Six devices canimplement a complete IPI master or slaveinterface. Three transceivers in a package are pinned out for
connection to a parallel databus. The fourth transceiver, with
the flexibility provided by its individual enables, can serve as
a control bus transceiver.
Features
n Pinout for IPI interface
n Compact 20-pin PLCC package
n Meets EIA-485 standard for multipoint bus transmission
n Greater than 60 mA source/sink
n Thermal Shutdown Protection
Pinout and Logic Diagram
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS010602-1
Order Number DS36950
See NS Package Number V20A
DS010602-2
July 1998
DS36950 Quad Differential Bus Transceiver
© 1999 National Semiconductor Corporation DS010602 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 7V
Control Input Voltage V
CC
+ 0.5V
Driver Input Voltage V
CC
+ 0.5V
Driver Output Voltage/Receiver
Input Voltage −10V to +15V
Receiver Output Voltage 5.5V
Continuous Power Dissipation
@
25˚C
V Package 1.73W
Derate V Package 13.9 mW/˚C above 25˚C
Storage Temp. Range −65˚C to +150˚C
Lead Temp. (Soldering 4 Sec.) 260˚C
Recommended Operating
Conditions
Supply Voltage, V
CC
4.75V to 5.25V
Bus Voltage −7V to +12V
Operating Free Air Temp. (T
A
) 0˚C to +70˚C
Electrical Characteristics (Note 2)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
DRIVER CHARACTERISTICS
V
ODL
Differential Driver Output I
L
=
60 mA 1.5 1.9 V
Voltage (Full Load) V
CM
=
0V
V
OD
Differential Driver Output R
L
=
100Ω (EIA-422) 2.0 3.5 V
Voltage (Termination Load) R
L
=
54Ω (EIA-485) 1.5 3.2 V
∆IV
OD
I Change in Magnitude of Driver R
L
=
54Ω or 100Ω
Differential Output Voltage for (Note 4) (
Figure 1
) 0.2 V
Complementary Output States (EIA-485)
V
OC
Driver Common Mode Output R
L
=
54Ω 3.0 V
Voltage (Note 5) (
Figure 1
) (EIA-485)
∆IV
OC
I Change in Magnitude of Common (Note 4) (
Figure 1
) 0.2 V
Mode Output Voltage (EIA-485)
V
OH
Output Voltage HIGH I
OH
=
−55 mA 2.7 3.2 V
V
OL
Output Voltage LOW I
OL
=
55 mA 1.4 1.7 V
V
IH
Input Voltage HIGH 2.0 V
V
IL
Input Voltage LOW 0.8 V
V
CL
Input Clamp Voltage I=−18 mA −1.5 V
I
IH
Input High Current V
I
=
2.4V (Note 3) 20 µA
I
IL
Input Low Current V
I
=
0.4V (Note 3) −20 µA
I
OSC
Driver Short-Circuit V
O
=
−7V (EIA-485) −130 −250 mA
Output Current V
O
=
0V (EIA-422) −90 −150 mA
(Note 9) V
O
=
+12V (EIA-485) 130 250 mA
RECEIVER CHARACTERISTICS
I
OSR
Short Circuit Output Current V
O
=
0V (Note 9) −15 −28 −75 mA
I
OZ
TRI-STATE®Output Current V
O
=
0.4V to 2.4V 20 µA
V
OH
Output Voltage High V
ID
=
0.20V, I
OH
=
−0.4 mA 2.4 3.0 V
V
OL
Output Voltage Low V
ID
=
−0.20V, I
OL
=
4 mA 0.35 0.5 V
V
TH
Differential Input High V
O
=
V
OH,IO
=
−0.4 mA 0.03 0.20 V
Threshold Voltage (EIA-422/485)
V
TL
Differential Input Low V
O
=
V
OL,IO
=
4.0 mA −0.20 −0.03 V
Threshold Voltage (Note 6) (EIA-422/485)
V
HST
Hysteresis (Note 7) V
CM
=
0V 35 60 mV
DRIVER AND RECEIVER CHARACTERISTICS
V
IH
Enable Input Voltage High 2.0 V
V
IL
Enable Input Voltage Low 0.8 V
V
CL
Enable Input Clamp Voltage I=−18 mA −1.5 V
I
IN
Line Input Current Other Input=0V V
I
=
+12V 0.5 1 mA
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Electrical Characteristics (Note 2) (Continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
DRIVER AND RECEIVER CHARACTERISTICS
(Note 8) V
I
=
−7V −0.45 −0.8 mA
I
IH
Enable Input Current High V
OH
=
2.4V RE4 or DE
20 µA
REC
60 µA
I
IL
Enable Input Current Low V
OL
=
0.4V RE4 or DE
−20 µA
REC
−60 µA
I
CC
Supply Current (Note 10) No Load, Outputs Enabled 75 90 mA
I
CCZ
Supply Current (Note 10) No Load, Outputs Disabled 50 70 mA
Switching Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Conditions Min Typ Max Units
DRIVER SINGLE-ENDED CHARACTERISTICS
t
PZH
R
L
=
110Ω (
Figure 4
)3540ns
t
PZL
R
L
=
110Ω (
Figure 5
)2540ns
t
PHZ
R
L
=
110Ω (
Figure 4
)1525ns
t
PLZ
R
L
=
110Ω (
Figure 5
)3540ns
DRIVER DIFFERENTIAL CHARACTERISTICS
t
R,tF
Rise & Fall Time R
L
=
54Ω 13 16 ns
t
PLHD
Differential Propagation C
L
=
50 pF 9 15 19 ns
t
PHLD
Delays (Note 15) C
D
=
15 pF 9 15 19 ns
t
SKD
|t
PLHD−tPHLD
| Differential Skew (
Figures 3, 8
)36ns
RECEIVER CHARACTERISTICS
t
PLHD
Differential Propagation Delays 9 14 19 ns
t
PHLD
C
L
=
15 pF, V
CM
=
1.5V (
Figure 6
) 9 14 19 ns
t
SKD
|t
PLHD−tPHLD
| Differential Receiver Skew 1 3 ns
t
ZH
Output Enable Time to High Level 15 22 ns
t
ZL
Output Enable Time to Low Level C
L
=
15 pF 20 30 ns
t
HZ
Output Disable Time from High Level (
Figure 7
)1017ns
t
LZ
Output Disable Time from Low Level 17 25 ns
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 devices
should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation.
Note 2: Current into device pins is define as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified.
Note 3: I
IH
and IILincludes driver input current and receiver TRI-STATE leakage current.
Note 4: ∆IV
OD
I and ∆IVOCI are changes in magnitude of VODand VOC, respectively, that occur when the input changes state.
Note 5: In EIA Standards EIA-422 and EIA-485, V
OC
, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.
Note 6: Threshold parameter limits specified as an algebraic value rather than by magnitude.
Note 7: Hysteresis defined as V
HST
=
V
TH−VTL
.
Note 8: I
IN
includes the receiver input current and driver TRI-STATE leakage current.
Note 9: Short one output at a time.
Note 10: Total package supply current.
Note 11: All typicals are given for V
CC
=
5.0V and T
A
=
25˚C.
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