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PDF DS26C31 Data sheet ( Hoja de datos )
| Número de pieza | DS26C31 | |
| Descripción | CMOS Quad TRI-STATE Differential Line Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 con-
sumption.
The DS26C31 accepts TTL or CMOS input levels and trans-
lates these to RS-422 output levels. This part uses special
output circuitry that enables the drivers to power down with-
out loading down the bus. This device has enable and dis-
able 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 TTL input compatible
n Typical propagation delays: 6 ns
n Typical output skew: 0.5 ns
n Outputs will not load line when VCC = 0V
n DS26C31T meets the requirements of EIA standard
RS-422
n Operation from single 5V supply
n TRI-STATE outputs for connection to system buses
n Low quiescent current
n Available in surface mount
n 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
Truth Table
DS008574-12
ENABLE ENABLE Input Non-Inverting
Output
L HX
Z
All other
L
L
combinations of
H
H
enable inputs
L = Low logic state
X = Irrelevant
H = High logic state
Z = TRI-STATE (high impedance)
Inverting
Output
Z
H
L
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT™ is a trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS008574
www.national.com
1 page  
AC Test Circuit and Switching Time Waveforms (Continued)
DS008574-4
FIGURE 2. Propagation Delays
FIGURE 3. Enable and Disable Times
DS008574-5
Input pulse; f = 1 MHz, 50%; tr ≤ 6 ns, tf ≤ 6 ns
DS008574-7
FIGURE 4. Differential Rise and Fall Times
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Package Small Outline (M)
Order Number DS26C31TM
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DS26C31TN
NS Package Number N16E
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS26C31.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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