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Teilenummer | DS36954 |
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Beschreibung | Quad Differential Bus Transceiver | |
Hersteller | National Semiconductor | |
Logo | ||
Gesamt 10 Seiten July 1998
DS36954
Quad Differential Bus Transceiver
General Description
The DS36954 is a low power, quad EIA-485 differential bus
transceiver especially suited for high speed, parallel, multi-
point, I/O bus applications. A compact 20-pin surface mount
PLCC or SOIC package provides high transceiver integra-
tion and a very small PC board footprint.
Propagation delay skew between devices is specified to aid
in parallel interface designs — limits on maximum and mini-
mum delay times are guaranteed.
Five devices can implement a complete SCSI initiator or tar-
get interface. Three transceivers in a package are pinned out
for data bus connections. The fourth transceiver, with the
flexibility provided by its individual enables, can serve as a
control bus transceiver.
Features
n Pinout for SCSI interface
n Compact 20-pin PLCC or SOIC package
n Meets EIA-485 standard for multipoint bus transmission
n Greater than 60 mA source/sink currents
n Thermal shutdown protection
n Glitch-free driver outputs on power up and down
Connection Diagrams
Logic Diagrams
DS011014-1
Order Number DS36954V
See NS Package Number V20A
DS011014-19
Order Number DS36954M
See NS Package Number M20B
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011014
DS011014-2
www.national.com
Parameter Measurement Information (Continued)
S1 1.5V
S2 Open
S3 Closed
S1 1.5V
S2 Closed
C3 Closed
DS011014-13
DS011014-14
S1 −1.5V
S2 Closed
C3 Open
DS011014-15
DS011014-16
S1 −1.5V
S2 Closed
C3 Closed
FIGURE 8. Receiver Enable and Disable Timing
DS011014-17
DS011014-18
Tra, Trb, Tfa and Tfb are propagation delay measurements to the 20% and 80% levels.
TCP = Crossing Point
FIGURE 9. Propagation Delay Timing for Calculations of Driver Differential Propagation Delays
Note 12: The input pulse is supplied by a generator having the following characteristics: f = 1.0 MHz, 50% duty cycle, trand tf < 6.0 ns, ZO = 50Ω.
Note 13: CL includes probe and stray capacitance.
Note 14: Diodes are 1N916 or equivalent.
Note 15: Differential propagation delays are calculated from single-ended propagation delays measured from driver input to the 20% and 80% levels on the driver
outputs (Figure 9) .
www.national.com
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6 Page | ||
Seiten | Gesamt 10 Seiten | |
PDF Download | [ DS36954 Schematic.PDF ] |
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