器件名称: 74ALVCHR16269AGRE4
功能描述: 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS
文件大小: 181.68KB 共12页
简 介:www.ti.com
SN74ALVCHR16269A 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS
SCES050O – AUGUST 1995 – REVISED SEPTEMBER 2004
FEATURES
Member of the Texas Instruments Widebus Family Operates From 1.65 V to 3.6 V Max tpd of 5.2 ns at 3.3 V ±24-mA Output Drive at 3.3 V All Outputs Have Equivalent 26- Series Resistors, So No External Resistors Are Required Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors Latch-Up Performance Exceeds 250 mA Per JESD 17 ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A)
DGG, DGV, OR DL PACKAGE (TOP VIEW)
DESCRIPTION/ORDERING INFORMATION
This 12-bit to 24-bit registered bus exchanger is designed for 1.65-V to 3.6-V VCC operation. The SN74ALVCHR16269A is used in applications in which two ports must be multiplexed onto, or demultiplexed from, a single port. It is particularly suitable as an interface between synchronous DRAMs and high-speed microprocessors.
26 31 Data is stored in the internal B-port registers on the 27 30 low-to-high transition of the clock (CLK) input, when the appropriate clock-enable (CLKENA) inputs are 28 29 low. Proper control of these inputs allows two sequential 12-bit words to be presented as a 24-bit NC No internal connection 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 p……