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DS36950
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SNLS075C – JULY 1998 – REVISED FEBRUARY 2013
DS36950 Quad Differential Bus Transceiver
Check for Samples: DS36950
FEATURES
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•2 Pinout for IPI Interface • Compact 20-pin PLCC Package • Meets EIA-485 Standard for Multipoint Bus
Transmission • Greater than 60 mA Source/Sink • Thermal Shutdown Protection
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 can implement a complete IPI master or slave interface. 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.
Pinout and Logic Diagram
Figure 1. Top View (Package Number FN0020A)
Figure 2. Block Diagram
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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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. All trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 1998–2013, Texas Instruments Incorporated
DS36950
SNLS075C – JULY 1998 – REVISED FEBRUARY 2013
www.ti.com
Absolute Maximum Ratings (1)(2)
Supply Voltage Control Input Voltage Driver Input Voltage Driver Output Voltage/Receiver
Input Voltage Receiver Output Voltage Continuous Power Dissipation @ 25°C FN0020A Package
Derate FN0020A Package 13.9 mW/°C above 25°C Storage Temp. Range Lead Temp. (Soldering 4 Sec.)
7V VCC + 0.5V VCC + 0.5V
−10V to +15V 5.5V
1.73W
−65°C to +150°C 260°C
(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.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
Recommended Operating Conditions(1)
Supply Voltage, VCC Bus Voltage Operating Free Air Temperature (TA)
4.75V to 5.25V −7V to +12V 0°C to +70°C
(1) All typicals are given for VCC = 5.0V and TA = 25°C.
Electrical Characteristics (1)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Parameter
Test Conditions
Driver Characteristics
VODL VOD ΔIVODI
Differential Driver Output Voltage (Full Load) Differential Driver Output Voltage (Termination Load) Change in Magnitude of Driver Differential Output Voltage for
IL = 60 mA VCM = 0V RL = 100Ω (EIA-422) RL = 54Ω (EIA-485) RL = 54Ω or 100Ω (2)(Figure 3)
Complementary Output States
(EIA-485)
VOC ΔIVOCI
Driver Common Mode Output Voltage (3) Change in Magnitude of Common Mode Output Voltage
RL = 54Ω (Figure 3) (EIA-485) (2) (Figure 3)
(EIA-485)
VOH Output Voltage HIGH VOL Output Voltage LOW VIH Input Voltage HIGH VIL Input Voltage LOW VCL Input Clamp Voltage IIH Input High Current IIL Input Low Current
IOH = −55 mA IOL = 55 mA
I = −18 mA VI = 2.4V (4) VI = 0.4V (4)
Min Typ Max Units
1.5 1.9
V
2.0 3.5 1.5 3.2
V V
0.2 V
3.0 V
0.2 V
2.7 3.2
V
1.4 1.7
V
2.0 V
0.8 V
−1.5 V
20 μA
−20 μA
(1) 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.
(2) ΔIVODI and ΔIVOCI are changes in magnitude of VOD and VOC, respectively, that occur when the input changes state. (3) In EIA Standards EIA-422 and EIA-485, VOC, which is the average of the two output voltages with respect to ground, is called output
offset voltage, VOS. (4) IIH and IIL includes driver input current and receiver TRI-STATE leakage current.
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Copyright © 1998–2013, Texas Instruments Incorporated
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DS36950
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SNLS075C – JULY 1998 – REVISED FEBRUARY 2013
Electrical Characteristics (1) (continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
IOSC
Parameter Driver Short-Circuit Output Current (5)
R.