Document
DS36950 Quad Differential Bus Transceiver
July 1998
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 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.
Features
n n n n n 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
Pinout and Logic Diagram
DS010602-1
Order Number DS36950 See NS Package Number V20A
DS010602-2
TRI-STATE ® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS010602
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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 Control Input Voltage Driver Input Voltage Driver Output Voltage/Receiver Input Voltage Receiver Output Voltage Continuous Power Dissipation @ 25˚C V Package 7V VCC + 0.5V VCC + 0.5V −10V to +15V 5.5V 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, VCC Bus Voltage Operating Free Air Temp. (TA) 4.75V to 5.25V −7V to +12V 0˚C to +70˚C
Electrical Characteristics (Note 2)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol VODL VOD ∆IVODI Parameter Differential Driver Output Voltage (Full Load) Differential Driver Output Voltage (Termination Load) Change in Magnitude of Driver Differential Output Voltage for Complementary Output States VOC ∆IVOCI VOH VOL VIH VIL VCL IIH IIL IOSC Driver Common Mode Output Voltage (Note 5) Change in Magnitude of Common Mode Output Voltage Output Voltage HIGH Output Voltage LOW Input Voltage HIGH Input Voltage LOW Input Clamp Voltage Input High Current Input Low Current Driver Short-Circuit Output Current (Note 9) RECEIVER CHARACTERISTICS IOSR IOZ VOH VOL VTH VTL VHST VIH VIL VCL IIN
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Conditions IL = 60 mA VCM = 0V RL = 100Ω (EIA-422) RL = 54Ω (EIA-485) RL = 54Ω or 100Ω (Note 4) (Figure 1) (EIA-485) RL = 54Ω (Figure 1) (EIA-485) (Note 4) (Figure 1) (EIA-485) IOH = −55 mA IOL = 55 mA
Min 1.5 2.0 1.5
Typ 1.9 3.5 3.2
Max
Units V V V
DRIVER CHARACTERISTICS
0.2 3.0 0.2 2.7 2.0 0.8 3.2 1.4 1.7
V V V V V V V V µA µA mA mA mA mA µA V V V V mV V
I = −18 mA VI = 2.4V (Note 3) VI = 0.4V (Note 3) VO = −7V VO = 0V VO = +12V (EIA-485) (EIA-422) (EIA-485) −15 2.4 −130 −90 130 −28 3.0 0.35 0.03 −0.20 35 2.0 −0.03 60
−1.5 20 −20 −250 −150 250 −75 20 0.5 0.20
Short Circuit Output Current TRI-STATE ® Output Current Output Voltage High Output Voltage Low Differential Input High Threshold Voltage Differential Input Low Threshold Voltage (Note 6) Hysteresis (Note 7) Enable Input Voltage High Enable Input Voltage Low Enable Input Clamp Voltage Line Input Current
VO = 0V (Note 9) VO = 0.4V to 2.4V VID = 0.20V, IOH = −0.4 mA VID = −0.20V, IOL = 4 mA VO = VOH, IO = −0.4 mA (EIA-422/485) VO = VOL, IO = 4.0 mA (EIA-422/485) VCM = 0V
DRIVER AND RECEIVER CHARACTERISTICS 0.8 I = −18 mA Other Input = 0V
2
V V mA
−1.5 VI = +12V 0.5 1
Electrical Characteristics (Note 2)
Symbol (Note 8) IIH IIL ICC ICCZ Enable Input Current High Enable Input Current Low Supply Current (Note 10) Supply Current (Note 10) Parameter
(Continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Conditions VI = −7V VOH = 2.4V VOL = 0.4V RE4 or DE REC RE4 or DE REC No Load, Outputs Enabled No Load, Outputs Disabled 75 50 Min Typ −0.45 Max −0.8 20 60 −20 −60 90 70 Units mA µA µA µA µA mA mA DRIVER AND RECEIVER CHARACTERISTICS
Switching Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Conditions Min Typ 35 25 15 35 RL = 54Ω CL = 50 pF CD = 15 pF (Figures 3, 8) 9 9 13 9 9 15 15 3 14 14 1 15 CL = 15 pF (Figure 7) 20 10 17 Max 40 40 25 40 16 19 19 6 19 19 3 22 30 17 25 Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns DRIVER SINGLE-ENDED CHARACTERISTICS tPZH RL = 110Ω (Figure 4) tPZL tPHZ tPLZ tR, tF tPLHD tPHLD tSKD tPLHD tPHLD tSKD tZH tZL tHZ tLZ RL = 110Ω (Figure 5) RL = 110Ω (Figure 4) RL = 110Ω (Figure 5) Rise & Fall Time Differential Propagation Delays (Note 15) |tPLHD − tPHLD| Different.