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PDF DC89C386 Data sheet ( Hoja de datos )
| Número de pieza | DC89C386 | |
| Descripción | Twelve Channel CMOS Differential Line Receiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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October 2001
DS89C386
Twelve Channel CMOS Differential Line Receiver
www.datashGeete4un.ceomral Description
The DS89C386 is a high speed twelve channel CMOS dif-
ferential receiver that meets the requirements of TIA/EIA-
422-B. The DS89C386 features low power dissipation of 240
mW typical.
Each TRI-STATE® enable, EN, allows the receiver output to
be active or in a Hi-impedance off state. Each enable is
common to only two receivers for flexibility and multiplexing
of receiver outputs.
The receiver output (RO) is guaranteed to be High when the
inputs are left open and unterminated. The receiver can
detect signals as low and including ±200 mV over the com-
mon mode range of ±7V. The receiver outputs (RO) are
compatible with both TTL and CMOS levels.
Features
n Low power design — 240 mW typical
n Meets TIA/EIA-422-B (RS-422)
n Receiver OPEN input failsafe feature
n Guaranteed AC parameters:
— Maximum receiver skew −4 ns
— Maximum transition time −9 ns
n High Output Drive Capability: ±6 mA
n Available in SSOP packaging:
— Requires 30% less PCB space than 3 DS34C86TMs
Connection Diagram
48L SSOP
DS89C386
Function Diagram
1/6 of package
01208502
Truth Table
Enable
Inputs
EN RI–RI*
LX
H ≥200 mV or OPEN†
H ≤ −200 mV
H +200 mV > and > −200 mV
†Not terminated.
Output
RO
Z
H
L
X
01208501
Order Number DS89C386TMEA
See NS Package Number MS48A
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS012085
www.national.com
1 page  
Parameter Measurement Information (Continued)
www.datasheet4u.com
CL Includes load and test jig capacitance.
S1 = VCC for tPZL, and tPLZ measurements.
S1 = GND for tPZH, and tPHZ measurements.
S1 = Open for tPLH, tPHL, and tSK.
01208505
FIGURE 2. Test Circuit for Switching Characteristics
FIGURE 3. TRI-STATE Output Enable and Disable Waveforms
Application Information
01208506
* RT is optional although highly recommended to reduce reflections.
FIGURE 4. Two-Wire Balanced System, RS-422
01208507
SKEW
Skew may be thought of in a lot of different ways, the next
few paragraphs should clarify what is represented by tSK in
this datasheet and how it is determined. Skew, as used in
this databook, is the absolute value of a mathematical differ-
ence between two propagation delays. This is commonly
accepted throughout the semiconductor industry. However,
there is no standardized method of measuring propagation
delay, from which skew is calculated, of differential line re-
ceivers. Elucidating, the voltage level, at which propagation
delays are measured, on both input and output waveforms
are not always consistant. Therefore, skew calculated in this
datasheet, may not be calculated the same as skew defined
in another. This is important to remember whenever making
a skew comparison.
Skew may be calculated for the DS89C386, from many
different propagation delay measurements. They may be
classified into two categories, single-ended and differential.
Single-ended skew is calculated from tPHL and tPLH propa-
5 www.national.com
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DC89C386.PDF ] | |
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