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74VMEH22501DGGRG4 Datasheet(PDF) 2 Page - Texas Instruments

No. de pieza 74VMEH22501DGGRG4
Descripción Electrónicos  8-BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1-BIT BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3-STATE OUTPUTS
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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74VMEH22501DGGRG4 Datasheet(HTML) 2 Page - Texas Instruments

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SN74VMEH22501
SCES357F – JULY 2001 – REVISED FEBRUARY 2010
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
High-speed backplane operation is a direct result of the improved OEC™ circuitry and high drive that has been
designed and tested into the VME64x backplane model. The B-port I/Os are optimized for driving large capacitive
loads and include pseudo-ETL input thresholds (½ VCC ± 50 mV) for increased noise immunity. These
specifications support the 2eVME protocols in VME64x (ANSI/VITA 1.1) and 2eSST protocols in VITA 1.5. With
proper design of a 21-slot VME system, a designer can achieve 320-Mbyte transfer rates on linear backplanes
and, possibly, 1-Gbyte transfer rates on the VME320 backplane.
All inputs and outputs are 5-V tolerant and are compatible with TTL and 5-V CMOS inputs.
Active bus-hold circuitry holds unused or undriven 3A-port inputs at a valid logic state. Bus-hold circuitry is not
provided on 1A or 2A inputs, any B-port input, or any control input. Use of pullup or pulldown resistors with the
bus-hold circuitry is not recommended.
This device is fully specified for live-insertion applications using Ioff, power-up 3-state, and BIAS VCC. The Ioff
circuitry prevents damaging current to backflow through the device when it is powered off/on. The power-up
3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents
driver conflict. The BIAS VCC circuitry precharges and preconditions the B-port input/output connections,
preventing disturbance of active data on the backplane during card insertion or removal, and permits true
live-insertion capability.
When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, output-enable (OE and OEBY) inputs should be tied
to VCC through a pullup resistor and output-enable (OEAB) inputs should be tied to GND through a pulldown
resistor; the minimum value of the resistor is determined by the drive capability of the device connected to this
input.
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
BGA MicroStar™
Tape and reel
SN74VMEH22501ZQLR
VK501
Junior – ZQL
TSSOP – DGG
Tape and reel
SN74VMEH22501DGGR
VMEH22501
0°C to 85°C
TVSOP – DGV
Tape and reel
SN74VMEH22501DGVR
VK501
VFBGA – GQL
Tape and reel
SN74VMEH22501GQLR
VK501
(1)
Package drawings, thermal data, and symbolization are available at www.ti.com/sc/packaging.
2
Submit Documentation Feedback
Copyright © 2001–2010, Texas Instruments Incorporated
Product Folder Link(s): SN74VMEH22501


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