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74LVX161284AMTD Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor

Il numero della parte 74LVX161284AMTD
Spiegazioni elettronici  Low Voltage IEEE 161284 Translating Transceiver
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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© 2005 Fairchild Semiconductor Corporation
DS500204
www.fairchildsemi.com
June 1999
Revised June 2005
74LVX161284A
Low Voltage IEEE 161284 Translating Transceiver
General Description
The LVX161284A contains eight bidirectional data buffers
and eleven control/status buffers to implement a full
IEEE 1284 compliant interface. The device supports the
IEEE 1284 standard, with the exception of output slew rate,
and is intended to be used in an Extended Capabilities Port
mode (ECP). The pinout allows for easy connection from
the Peripheral (A-side) to the Host (cable side).
Outputs on the cable side can be configured to be either
open drain or high drive (
r 14 mA) and are connected to a
separate power supply pin (VCCcable) to allow these out-
puts to be driven by a higher supply voltage than the A-
side. The pull-up and pull-down series termination resis-
tance of these outputs on the cable side is optimized to
drive an external cable. In addition, all inputs (except HLH)
and outputs on the cable side contain internal pull-up resis-
tors connected to the VCCcable supply to provide proper
termination and pull-ups for open drain mode.
Outputs on the Peripheral side are standard low-drive
CMOS outputs designed to interface with 3V logic. The DIR
input controls data flow on the A1–A8/B1–B8 transceiver
pins.
Features
s Supports IEEE 1284 Level 1 and Level 2 signaling
standards for bidirectional parallel communications
between personal computers and printing peripherals
with the exception of output slew rate
s Translation capability allows outputs on the cable side to
interface with 5V signals
s All inputs have hysteresis to provide noise margin
s B and Y output resistance optimized to drive external
cable
s B and Y outputs in high impedance mode during power
down
s Inputs and outputs on cable side have internal pull-up
resistors
s Flow-through pin configuration allows easy interface
between the “Peripheral and Host”
s Replaces the function of two (2) 74ACT1284 devices
Ordering Code
Connection Diagram
Pin Descriptions
Order Number
Package
Number
Package Description
74LVX161284AMTD
MTD48
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
[TUBE]
74LVX161284AMTX
MTD48
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
[TAPE and REEL]
Pin Names
Description
HD
High Drive Enable Input (Active HIGH)
DIR
Direction Control Input
A1–A8
Inputs or Outputs
B1–B8
Inputs or Outputs
A9–A13
Inputs
Y9–Y13
Outputs
A14–A17
Outputs
C14–C17
Inputs
PLHIN
Peripheral Logic HIGH Input
PLH
Peripheral Logic HIGH Output
HLHIN
Host Logic HIGH Input
HLH
Host Logic HIGH Output


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