SN74AVC16269 Datasheet, PDF (1/17 Pages) Texas Instruments – 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS

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FEATURES
• Member of the Texas Instruments Widebus™
Family
• EPIC™ (Enhanced-Performance Implanted
CMOS) Submicron Process
• DOC™ (Dynamic Output Control) Circuit
Dynamically Changes Output Impedance,
Resulting in Noise Reduction Without Speed
Degradation
• Dynamic Drive Capability Is Equivalent to
Standard Outputs With I_OH and I_OL of ±24 mA
at 2.5-V V_CC
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
• I_off Supports Partial-Power-Down Mode
Operation
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• Package Options Include Plastic Thin Shrink
Small-Outline (DGG) and Thin Very
Small-Outline (DGV) Packages
DESCRIPTION
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 V_OL vs I_OL and V_OH vs I_OH 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.
3.2 _{TA = 25°C}
2.8 ^{Process = Nominal}
2.4
2.0
V_CC = 3.3 V
T_A = 25°C
2.8 Process = Nominal
2.4
2.0
1.6
V_CC = 2.5 V
1.2
V_CC = 1.8 V
0.8
0.4
0 17
34 51 68 85 102 119 136 153 170
I_OL - Output Current - mA
1.6
1.2
0.8
V_CC = 3.3 V
0.4
V_CC = 2.5 V
V_CC = 1.8 V
-160 -144 -128 -112 -96 -80 -64 -48 -32 -16 0
I_OH - Output Current - mA
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 V_CC, but is designed specifically for
1.65-V to 3.6-V V_CC 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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1998–2005, Texas Instruments Incorporated