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SN74ALVCH16270 датащи(PDF) 1 Page - Texas Instruments

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номер детали SN74ALVCH16270
подробное описание детали  12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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SN74ALVCH16270 датащи(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
DGG OR DL PACKAGE
(TOP VIEW)
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OEA
CLKEN1B
2B3
GND
2B2
2B1
VCC
A1
A2
A3
GND
A4
A5
A6
A7
A8
A9
GND
A10
A11
A12
VCC
1B1
1B2
GND
1B3
CLKEN2B
SEL
OEB
CLKENA2
2B4
GND
2B5
2B6
VCC
2B7
2B8
2B9
GND
2B10
2B11
2B12
1B12
1B11
1B10
GND
1B9
1B8
1B7
VCC
1B6
1B5
GND
1B4
CLKENA1
CLK
SN74ALVCH16270
12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES028G – JULY 1995 – REVISED AUGUST 2004
Member of the Texas Instruments Widebus™
Family
EPIC™ (Enhanced-Performance Implanted
CMOS) Submicron Process
Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Latch-Up Performance Exceeds 250 mA Per
JESD 17
Package Options Include Plastic Shrink
Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages
This 12-bit to 24-bit registered bus exchanger is
designed for 1.65-V to 3.6-V VCC operation.
The SN74ALVCH16270 is used in applications in
which data must be transferred from a narrow
high-speed bus to a wide lower-frequency bus.
The device provides synchronous data exchange
between the two ports. Data is stored in the internal
registers on the low-to-high transition of the clock
(CLK) input when the appropriate CLKEN inputs are
low. The select (SEL) line selects 1B or 2B data for
the A outputs. For data transfer in the A-to-B
direction, a two-stage pipeline is provided in the
A-to-1B path, with a single storage register in the
A-to-2B path. Proper control of the CLKENA inputs
allows two sequential 12-bit words to be presented
synchronously as a 24-bit word on the B port. Data
flow is controlled by the active-low output enables
(OEA, OEB). The control terminals are registered to
synchronize the bus-direction changes with CLK.
line
space
To ensure the high-impedance state during power up or power down, a clock pulse should be applied as soon as
possible, and OE should be tied to V
CC through a pullup resistor; the minimum value of the resistor is determined
by the current-sinking capability of the driver. Due to OE being routed through a register, the active state of the
outputs cannot be determined prior to the arrival of the first clock pulse.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN74ALVCH16270 is characterized for operation from -40
°C to 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus, EPIC are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 1995–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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