June 1998
Differential Line Driver
General Description |
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All inputs are protected against damage due to electrostatic |
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The DS26C31 is a quad differential line driver designed for |
discharge by diodes to VCC and ground. |
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digital data transmission over balanced |
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The |
Features |
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DS26C31T meets all the requirements of EIA standard |
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n TTL input compatible |
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RS-422 while retaining the low power characteristics of |
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CMOS. The DS26C31M is compatible with EIA standard |
n Typical propagation delays: 6 ns |
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RS-422; however, one exception in test methodology is |
n Typical output skew: 0.5 ns |
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taken (Note 8). This enables the construction of serial and |
n Outputs will not load line when VCC = 0V |
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terminal interfaces while maintaining minimal |
power |
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n DS26C31T meets the requirements of EIA standard |
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sumption. |
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RS-422 |
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The DS26C31 accepts TTL or CMOS input levels and trans- |
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n Operation from single 5V supply |
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lates these to RS-422 output levels. This part uses special |
n TRI-STATE outputs for connection to system buses |
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output circuitry that enables the drivers to power down with- |
n Low quiescent current |
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out loading down the bus. This device has enable and dis- |
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n Available in surface mount |
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able circuitry common to all four drivers. The DS26C31 is pin |
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n Mil-Std-883C compliant |
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compatible to the AM26LS31 and the DS26LS31. |
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Connection Diagrams
Dual-In-Line Package
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
20-Lead Ceramic Leadless Chip Carrier (E)
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DS008574-12 |
Truth Table |
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ENABLE |
ENABLE |
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Input |
Non-Inverting |
Inverting |
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Output |
Output |
L |
H |
X |
Z |
Z |
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All other |
L |
L |
H |
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combinations of |
H |
H |
L |
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enable inputs |
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L = Low logic state
X = Irrelevant
H = High logic state
Z = TRI-STATE (high impedance)
TRI-STATE® is a registered trademark of National Semiconductor Corporation. FACT™ is a trademark of National Semiconductor Corporation.
Driver Line Differential STATE-TRI Quad CMOS DS26C31T/DS26C31M
© 1998 National Semiconductor Corporation |
DS008574 |
www.national.com |
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) |
−0.5V to 7.0V |
DC Input Voltage (VIN) |
−1.5V to V CC +1.5V |
DC Output Voltage (VOUT) |
−0.5V to 7V |
Clamp Diode Current (IIK, IOK) |
±20 mA |
DC Output Current, per pin (IOUT) |
±150 mA |
DC VCC or GND Current, |
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per pin (ICC) |
±150 mA |
Storage Temperature Range (TSTG) |
−65ÊC to +150ÊC |
Max. Power Dissipation (PD) @25ÊC (Note 3) |
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Ceramic ªJº Pkg. |
2419 mW |
Plastic ªNº Pkg. |
1736 mW |
SOIC ªMº Pkg. |
1226 mW |
Ceramic ªWº Pkg. |
1182 mW |
Ceramic ªEº Pkg. |
2134 mW |
Lead Temperature (TL) |
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(Soldering, 4 sec.) |
260ÊC |
This device does not meet 2000V ESD Rating. (Note 13) |
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Operating Conditions
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Min |
Max |
Units |
Supply Voltage (VCC) |
4.50 |
5.50 |
V |
DC Input or Output Voltage |
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(VIN, VOUT) |
0 |
VCC |
V |
Operating Temperature Range (TA) |
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DS26C31T |
−40 |
+85 |
ÊC |
DS26C31M |
−55 |
+125 |
ÊC |
Input Rise or Fall Times (tr, tf) |
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500 |
ns |
DC Electrical Characteristics
VCC = 5V ± 10% (unless otherwise specified) (Note 4)
Symbol |
Parameter |
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Conditions |
Min |
Typ |
Max |
Units |
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VIH |
High Level Input Voltage |
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2.0 |
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V |
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VIL |
Low Level Input Voltage |
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0.8 |
V |
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VOH |
High Level Output Voltage |
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VIN = VIH or VIL, |
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2.5 |
3.4 |
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V |
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IOUT = −20 mA |
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VOL |
Low Level Output |
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VIN = VIH or VIL, |
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0.3 |
0.5 |
V |
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Voltage |
IOUT = 20 mA |
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VT |
Differential Output |
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RL = 100Ω |
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2.0 |
3.1 |
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V |
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Voltage |
(Note 5) |
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RL = 100Ω |
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|VT| − |V |
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Difference In |
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0.4 |
V |
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T |
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Differential Output |
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(Note 5) |
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VOS |
Common Mode |
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RL = 100Ω |
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1.8 |
3.0 |
V |
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Output Voltage |
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(Note 5) |
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Difference In |
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RL = 100Ω |
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0.4 |
V |
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|VOS − V |
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OS |
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Common Mode Output |
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(Note 5) |
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IIN |
Input Current |
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VIN = VCC, GND, VIH, or VIL |
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±1.0 |
µA |
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ICC |
Quiescent Supply |
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DS26C31T |
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VIN = VCC or GND |
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200 |
500 |
µA |
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Current (Note 6) |
IOUT = 0 µA |
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VIN = 2.4V or 0.5V |
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0.8 |
2.0 |
mA |
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(Note 6) |
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DS26C31M |
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VIN = VCC or GND |
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200 |
500 |
µA |
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IOUT = 0 µA |
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VIN = 2.4V or 0.5V |
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0.8 |
2.1 |
mA |
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(Note 6) |
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IOZ |
TRI-STATE Output |
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VOUT = VCC or GND |
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Leakage Current |
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ENABLE = VIL |
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±0.5 |
±5.0 |
µA |
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= VIH |
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ENABLE |
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ISC |
Output Short |
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VIN = VCC or GND |
−30 |
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−150 |
mA |
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Circuit Current |
(Notes 5, 7) |
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www.national.com |
2 |
DC Electrical Characteristics (Continued)
VCC = 5V ± 10% (unless otherwise specified) (Note 4)
Symbol |
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Conditions |
Min |
Typ |
Max |
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IOFF |
Output Leakage Current |
DS26C31T |
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VOUT = 6V |
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100 |
µA |
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Power Off (Note 5) |
VCC = 0V |
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VOUT = −0.25V |
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−100 |
µA |
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DS26C31M |
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VOUT = 6V |
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100 |
µA |
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VCC = 0V |
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VOUT = 0V |
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−100 |
µA |
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(Note 8) |
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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 ªElectrical Characteristicsº 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 25ÊC. Above this temperature derate N package at 13.89 mW/ÊC, J package 16.13 mW/ÊC, M package 9.80 mW/ÊC, E package 12.20 mW/ÊC, and W package 6.75 mW/ÊC.
Note 4: Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for VCC = 5V and TA = 25ÊC.
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 (−55ÊC to +125ÊC) is tested with V OUT between +6V and 0V while RS-422A condition is +6V and −0.25V.
Switching Characteristics
VCC = 5V ±10%, tr ≤ 6 ns, tf ≤ 6 ns (Figures 1, 2, 3, 4) (Note 4)
Symbol |
Parameter |
Conditions |
Min |
Typ |
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Max |
Units |
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DS26C31T |
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CS26C31M |
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tPLH, tPHL |
Propagation Delays |
S1 |
Open |
2 |
6 |
11 |
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14 |
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Input to Output |
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Skew |
(Note 9) |
S1 |
Open |
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0.5 |
2.0 |
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3.0 |
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tTLH, tTHL |
Differential Output Rise |
S1 |
Open |
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6 |
10 |
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14 |
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And Fall Times |
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tPZH |
Output Enable Time |
S1 |
Closed |
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11 |
19 |
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22 |
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tPZL |
Output Enable Time |
S1 |
Closed |
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21 |
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28 |
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tPHZ |
Output Disable Time |
S1 |
Closed |
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5 |
9 |
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(Note 10) |
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tPLZ |
Output Disable Time |
S1 |
Closed |
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7 |
11 |
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14 |
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(Note 10) |
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CPD |
Power Dissipation |
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50 |
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pF |
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Capacitance (Note 11) |
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CIN |
Input Capacitance |
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6 |
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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.
Comparison Table of Switching Characteristics into ªLS-Typeº Load
VCC = 5V, TA = 25ÊC, tr ≤ 6 ns, tf ≤ 6 ns (Figures 2, 4, 5, 6) (Note 12)
Symbol |
Parameter |
Conditions |
DS26C31T |
DS26LS31C |
Units |
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Typ |
Max |
Typ |
Max |
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tPLH, tPHL |
Propagation Delays |
CL = 30 pF |
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Input to Output |
S1 Closed |
6 |
8 |
10 |
15 |
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S2 Closed |
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Skew |
(Note 9) |
CL = 30 pF |
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S1 Closed |
0.5 |
1.0 |
2.0 |
6.0 |
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S2 Closed |
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3 |
www.national.com |
Comparison Table of Switching Characteristics into ªLS-Typeº Load
(Continued)
VCC = 5V, TA = 25ÊC, tr ≤ 6 ns, tf ≤ 6 ns (Figures 2, 4, 5, 6) (Note 12)
Symbol |
Parameter |
Conditions |
DS26C31T |
DS26LS31C |
Units |
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Typ |
Max |
Typ |
Max |
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tTHL, tTLH |
Differential Output Rise |
CL = 30 pF |
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and Fall Times |
S1 |
Closed |
4 |
6 |
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S2 |
Closed |
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tPLZ |
Output Disable Time |
CL = 10 pF |
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(Note 10) |
S1 |
Closed |
6 |
9 |
15 |
35 |
ns |
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S2 |
Open |
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tPHZ |
Output Disable Time |
CL = 10 pF |
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(Note 10) |
S1 |
Open |
4 |
7 |
15 |
25 |
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S2 |
Closed |
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tPZL |
Output Enable Time |
CL = 30 pF |
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S1 |
Closed |
14 |
20 |
20 |
30 |
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S2 |
Open |
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tPZH |
Output Enable Time |
CL = 30 pF |
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S1 |
Open |
11 |
17 |
20 |
30 |
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S2 |
Closed |
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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 kW, 100 pF)
Inputs ³ 1500V
Outputs ³ 1000V
EIAJ (0W, 200 pF) ³ 350V
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 = 50W, R3 = 500W.
FIGURE 1. AC Test Circuit
www.national.com |
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