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74AVC16269DGGRE4 数据表(PDF) 1 Page - Texas Instruments

部件名 74AVC16269DGGRE4
功能描述  12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

74AVC16269DGGRE4 数据表(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
136
-128
-144
-160
0.4
0.8
1.2
1.6
2.0
2.4
2.8
170
153
119
102
85
68
51
34
17
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
TA = 25°C
Process = Nominal
IOL - Output Current - mA
VCC = 3.3 V
VCC = 2.5 V
VCC = 1.8 V
TA = 25°C
Process = Nominal
IOH - Output Current - mA
VCC = 3.3 V
VCC = 2.5 V
VCC = 1.8 V
-80
-96
-112
-32
-48
-64
0
-16
SN74AVC16269
12-BIT TO 24-BIT REGISTERED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES152G – DECEMBER 1998 – REVISED MAY 2005
Overvoltage-Tolerant Inputs/Outputs Allow
Mixed-Voltage-Mode Data Communications
Member of the Texas Instruments Widebus™
Family
Ioff Supports Partial-Power-Down Mode
Operation
EPIC™ (Enhanced-Performance Implanted
CMOS) Submicron Process
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
DOC™ (Dynamic Output Control) Circuit
Dynamically Changes Output Impedance,
Package Options Include Plastic Thin Shrink
Resulting in Noise Reduction Without Speed
Small-Outline (DGG) and Thin Very
Degradation
Small-Outline (DGV) Packages
Dynamic Drive Capability Is Equivalent to
Standard Outputs With IOH and IOL of ±24 mA
at 2.5-V VCC
A Dynamic Output Control (DOC™) circuit is implemented, which, during the transition, initially lowers the output
impedance to effectively drive the load and, subsequently, raises the impedance to reduce noise. Figure 1 shows
typical VOL vs IOL and VOH vs IOH curves to illustrate the output impedance and drive capability of the circuit. At
the beginning of the signal transition, the DOC circuit provides a maximum dynamic drive that is equivalent to a
high-drive standard-output device. For more information, refer to the TI application reports, AVC Logic Family
Technology and Applications, literature number SCEA006, and Dynamic Output Control (DOC™) Circuitry
Technology and Applications, literature number SCEA009.
Figure 1. Output Voltage vs Output Current
This 12-bit to 24-bit registered bus exchanger is operational at 1.2-V to 3.6-V VCC, but is designed specifically for
1.65-V to 3.6-V VCC operation.
The SN74AVC16269 is used in applications in which two separate ports must be multiplexed onto, or
demultiplexed from, a single port. The device is particularly suitable as an interface between synchronous
DRAMs and high-speed microprocessors.
Data is stored in the internal B-port registers on the low-to-high transition of the clock (CLK) input when the
appropriate clock-enable (CLKENA) inputs are low. Proper control of these inputs allows two sequential 12-bit
words to be presented as a 24-bit word on the B port. For data transfer in the B-to-A direction, a single storage
register is provided. The select (SEL) line selects 1B or 2B data for the A outputs. The register on the A output
permits the fastest possible data transfer, thus extending the period during which the data is valid on the bus.
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, DOC are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 1998–2005, 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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