DS90C031B_01 Datasheet, PDF (6/11 Pages) National Semiconductor (TI) – LVDS Quad CMOS Differential Line Driver

Applications Information (Continued)
to some ECL and PECL devices, but without the heavy static
I_CC requirements of the ECL/PECL designs. LVDS requires
> 80% less current than similar PECL devices. AC specifi-
cations for the driver are a tenfold improvement over other
existing RS-422 drivers.
The fail-safe circuitry guarantees that the outputs are en-
abled and at a logic ’0’ (the true output is low and the
complement output is high) when the inputs are floating.
The TRI-STATE function allows the driver outputs to be
disabled, thus obtaining an even lower power state when the
transmission of data is not required.
The footprint of the DS90C031B is the same as the industry
standard 26LS31 Quad Differential (RS-422) Driver.
The DS90C031B is electrically similar to the DS90C031, but
differs by supporting high impedance LVDS outputs under
power-off condition. This allows for multiple or redundant
drivers to be used in certain applications. The DS90C031B is
offered in a space saving narrow SOIC (150 mil.) package.
For additional LVDS application information, please refer to
National’s LVDS Owner’s Manual available through Nation-
al’s website www.national.com/appinfo/lvds.
FIGURE 7. Driver Output Levels
Pin Descriptions
Pin No.
1, 7, 9, 15
2, 6, 10, 14
3, 5, 11, 13
4
12
16
8
Name
D_IN
D_OUT+
D_OUT−
EN
EN*
V_CC
GND
Description
Driver input pin, TTL/CMOS compatible
Non-inverting driver output pin, LVDS levels
Inverting driver output pin, LVDS levels
Active high enable pin, OR-ed with EN*
Active low enable pin, OR-ed with EN
Power supply pin, +5V ± 10%
Ground pin
Ordering Information
Operating
Temperature
−40˚C to +85˚C
Package Type/
Number
SOP/M16A
Order Number
DS90C031BTM
10098909
www.national.com
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