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Part: 5962-9163901MFA
Category:
Interface and Interconnect
-> RS-422/RS-423
Description: DS26C31M - CMOS Quad Tri State Differential Line Drivers, Package: Lcc, Pin Nb=20
Company: National Semiconductor Corporation
Datasheet: Download 5962-9163901MFA datasheet File size : 456 kB
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Datasheet text preview:
DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver
June 1998
DS26C31T/DS26C31M CMOS Quad TRI-STATE ® Differential Line Driver
General Description
The DS26C31 is a quad differential line driver designed for digital data transmission over balanced lines. The DS26C31T meets all the requirements of EIA standard RS-422 while retaining the low power characteristics of CMOS. The DS26C31M is compatible with EIA standard RS-422; however, one exception in test methodology is taken (Note 8). This enables the construction of serial and terminal interfaces while maintaining minimal power consumption. The DS26C31 accepts TTL or CMOS input levels and translates these to RS-422 output levels. This part uses special output circuitry that enables the drivers to power down without loading down the bus. This device has enable and disable circuitry common to all four drivers. The DS26C31 is pin compatible to the AM26LS31 and the DS26LS31. All inputs are protected against damage due to electrostatic discharge by diodes to VCC and ground.
Features
n n n n n n n n n n TTL input compatible Typical propagation delays: 6 ns Typical output skew: 0.5 ns Outputs will not load line when VCC = 0V DS26C31T meets the requirements of EIA standard RS-422 Operation from single 5V supply TRI-STATE outputs for connection to system buses Low quiescent current Available in surface mount Mil-Std-883C compliant
Connection Diagrams
Dual-In-Line Package
20-Lead Ceramic Leadless Chip Carrier (E)
DS008574-1
Top View Order Number DS26C31TM or DS26C31TN See NS Package Number M16A or N16E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS26C31ME/883, DS26C31MJ/883 or DS26C31MW/883 See NS Package Number E20A, J16A or W16A
DS008574-12
Truth Table
ENABLE ENABLE L All other combinations of enable inputs
L = Low logic state X = Irrelevant H = High logic state Z = TRI-STATE (high impedance)
Input X L H
Non-Inverting Output Z L H
Inverting Output Z H L
H
TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACTTM is a trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS008574
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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 (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) Clamp Diode Current (IIK, IOK) DC Output Current, per pin (IOUT) DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) -0.5V to 7.0V -1.5V to VCC +1.5V -0.5V to 7V ± 20 mA ± 150 mA
Max. Power Dissipation (PD) @25°C (Note 3) Ceramic "J" Pkg. 2419 mW Plastic "N" Pkg. 1736 mW SOIC "M" Pkg. 1226 mW Ceramic "W" Pkg. 1182 mW Ceramic "E" Pkg. 2134 mW Lead Temperature (TL) (Soldering, 4 sec.) 260°C This device does not meet 2000V ESD Rating. (Note 13)
± 150 mA -65°C to +150°C
Operating Conditions
Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) DS26C31T DS26C31M Input Rise or Fall Times (tr, tf) Min 4.50 0 -40 -55 Max 5.50 VCC +85 +125 500 Units V V °C °C ns
DC Electrical Characteristics
VCC = 5V ± 10% (unless otherwise specified) (Note 4) Symbol VIH VIL VOH VOL VT |VT| - |VT | VOS |VOS - VOS | IIN ICC Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Differential Output Voltage Difference In Differential Output Common Mode Output Voltage Difference In Common Mode Output Input Current Quiescent Supply Current (Note 6) VIN = VIH or VIL, IOUT = -20 mA VIN = VIH or VIL, IOUT = 20 mA RL = 100 (Note 5) RL = 100 (Note 5) RL = 100 (Note 5) RL = 100 (Note 5) VIN = VCC, GND, VIH, or VIL DS26C31T VIN = VCC or GND IOUT = 0 µA VIN = 2.4V or 0.5V DS26C31M IOUT = 0 µA IOZ TRI-STATE Output Leakage Current ISC Output Short Circuit Current (Note 6) VIN = VCC or GND VIN = 2.4V or 0.5V 1.8 2.0 2.5 3.4 0.3 3.1 0.4 3.0 0.4 0.5 Conditions Min 2.0 0.8 Typ Max Units V V V V V V V V µA µA mA µA mA
± 1.0
200 0.8 200 0.8 500 2.0 500 2.1
(Note 6) VOUT = VCC or GND ENABLE = VIL ENABLE = VIH VIN = VCC or GND (Notes 5, 7) -30
± 0.5
± 5.0
-150
µA mA
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2
DC Electrical Characteristics
Symbol IOFF Parameter Output Leakage Current Power Off (Note 5)
(Continued)
VCC = 5V ± 10% (unless otherwise specified) (Note 4) DS26C31T VCC = 0V DS26C31M VCC = 0V Conditions VOUT = 6V VOUT = -0.25V VOUT = 6V VOUT = 0V (Note 8)
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 at 13.89 mW/°C, J package 16.13 mW/°C, M package 9.80 mW/°C, E package 12.20 mW/°C, and W package 6.75 mW/°C. Note 4: Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for VCC = 5V and TA = 25°C. Note 5: See EIA Specification RS-422 for exact test conditions. 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. Note 8: The DS26C31M (-55°C to +125°C) is tested with VOUT between +6V and 0V while RS-422A condition is +6V and -0.25V.
Min
Typ
Max 100 -100 100 -100
Units µA µA µA µA
Switching Characteristics
VCC = 5V ± 10%, tr 6 ns, tf 6 ns (Figures 1, 2, 3, 4) (Note 4) Symbol tPLH, tPHL Skew tTLH, tTHL tPZH tPZL tPHZ tPLZ CPD CIN Parameter Propagation Delays Input to Output (Note 9) Differential Output Rise And Fall Times Output Enable Time Output Enable Time Output Disable Time (Note 10) Output Disable Time (Note 10) Power Dissipation Capacitance (Note 11) Input Capacitance 6 pF
Note 9: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. Note 10: Output disable time is the delay from ENABLE or ENABLE 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 11: CPD determines the no load dynamic power consumption, PD = CPD VCC2 f + ICC VCC, and the no load dynamic current consumption, IS = CPD VCC f + ICC.
Conditions S1 Open S1 Open S1 Open S1 Closed S1 Closed S1 Closed S1 Closed
Min 2
Typ DS26C31T 6 0.5 6 11 13 5 7 50 11 2.0 10 19 21 9 11
Max CS26C31M 14 3.0 14 22 28 12 14
Units ns ns ns ns ns ns ns pF
Comparison Table of Switching Characteristics into "LS-Type" Load
VCC = 5V, TA = 25°C, tr 6 ns, tf 6 ns (Figures 2, 4, 5, 6) (Note 12) Symbol tPLH, tPHL Parameter Propagation Delays Input to Output Skew (Note 9) Conditions CL = 30 pF S1 Closed S2 Closed CL = 30 pF S1 Closed S2 Closed 0.5 1.0 2.0 6.0 ns 6 8 10 15 ns DS26C31T Typ Max DS26LS31C Typ Max Units
3
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Comparison Table of Switching Characteristics into "LS-Type" Load
(Continued) VCC = 5V, TA = 25°C, tr 6 ns, tf 6 ns (Figures 2, 4, 5, 6) (Note 12) Symbol tTHL, tTLH Parameter Differential Output Rise and Fall Times tPLZ Output Disable Time (Note 10) tPHZ Output Disable Time (Note 10) tPZL Output Enable Time Conditions CL = 30 pF S1 Closed S2 Closed CL = 10 pF S1 Closed S2 Open CL = 10 pF S1 Open S2 Closed CL = 30 pF S1 Closed tPZH Output Enable Time S2 Open CL = 30 pF S1 Open S2 Closed
Note 12: This table is provided for comparison purposes only. The values in this table for the DS26C31 reflect the performance of the device but are not tested or guaranteed. Note 13: ESD Rating: HBM (1.5 k, 100 pF) Inputs 1500V Outputs 1000V EIAJ (0, 200 pF) 350V
DS26C31T Typ 4 Max 6
DS26LS31C Typ Max
Units
ns
6
9
15
35
ns
4
7
15
25
ns
14
20
20
30
ns
11
17
20
30
ns
Logic Diagram
DS008574-2
AC Test Circuit and Switching Time Waveforms
DS008574-3
Note: C1 = C2 = C3 = 40 pF (Including Probe and Jig Capacitance), R1 = R2 = 50, R3 = 500.
FIGURE 1. AC Test Circuit
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4
AC Test Circuit and Switching Time Waveforms
(Continued)
DS008574-4
FIGURE 2. Propagation Delays
DS008574-5
FIGURE 3. Enable and Disable Times
DS008574-7
Input pulse; f = 1 MHz, 50%; tr 6 ns, tf 6 ns
FIGURE 4. Differential Rise and Fall Times
5
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