|DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver
DS26C31T/DS26C31M CMOS Quad TRI-STATE � Differential Line Driver
The 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
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
Top View Order Number or DS26C31TN See NS Package Number or N16E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number or DS26C31MW/883 See NS Package Number or W16AL = Low logic state X = Irrelevant H = High logic state Z = TRI-STATE (high impedance)
TRI-STATE is a registered trademark of National Semiconductor Corporation. FACTTM is a trademark of National Semiconductor Corporation.
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) -1.5V to VCC 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)
Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) DS26C31T DS26C31M Input Rise or Fall Times (tr, tf) Min Max 5.50 VCC +125 500 Units �C ns
VCC � 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 = 100 (Note = 100 (Note = 100 (Note = 100 (Note 5) VIN = VCC, GND, VIH, or VIL DS26C31T VIN = VCC or GND IOUT 0 �A VIN 0.5V DS26C31M IOUT 0 �A IOZ TRI-STATE Output Leakage Current ISC Output Short Circuit Current (Note 6) VIN = VCC or GND VIN or 0.5V Conditions Min 2.0 0.8 Typ Max Units �A mASymbol IOFF Parameter Output Leakage Current Power Off (Note 5)
VCC � 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 = 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 +125�C) is tested with VOUT between +6V and 0V while RS-422A condition is +6V and -0.25V.
VCC tr 6 ns, 6 ns (Figures (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 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
Comparison Table of Switching Characteristics into "LS-Type" Load
VCC tr 6 ns, 6 ns (Figures (Note 12) Symbol tPLH, tPHL Parameter Propagation Delays Input to Output Skew (Note 9) Conditions pF S1 Closed S2 Closed pF S1 Closed S2 Closed ns DS26C31T Typ Max DS26LS31C Typ Max Units