器件名称: 74ALVCH16269ZQLR
功能描述: 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS
文件大小: 441.71KB 共16页
简 介:www.ti.com
SN74ALVCH16269 12-BIT TO 24-BIT REGISTERED BUS EXCHANGER WITH 3-STATE OUTPUTS
SCES019N – JULY 1995 – REVISED JULY 2004
FEATURES
Member of the Texas Instruments Widebus Family Operates From 1.65 V to 3.6 V Max tpd of 5 ns at 3.3 V ±24-mA Output Drive at 3.3 V 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 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 SN74ALVCH16269 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, extending the period during which the data is valid on the bus. The control terminals are regist……
