54AC16474, 74AC164741
8BIT REGISTERED BUS TRANSCEIVERS
WITH 3STATE OUTPUTS

features

• Members of the Texas Instruments Widebus^TM Family
• Packaged in Shrink Small-Outline 300-mil Packages (DL) and 380-mil Fine-Pitch Ceramic Flat Packages (WD) Using 25-mil Center-to-Center Pin Spacings
• 3-State Outputs Drive Bus Lines Directly
• Flow-Through Architecture Optimizes Printed Circuit Board (PCB) Layout
• Distributed V_CC and GND Pin Configuration Minimizes High-Speed Switching Noise
• EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
• 500-mA Typical Latch-Up Immunity at 125°C

description

These devices are non-inverting 18-bit registered bus transceivers composed of two 9-bit sections with separate control signals. For either 9-bit transceiver section, data flow in the A-to-B mode is controlled by output-enable (1 or 2) and clock (1CLKAB or 2CLKAB) inputs. When 1 or 2 is low, the corresponding outputs are active (high or low ) and take on either the current data on low-to-high transition of 1CLKAB or 2CLKAB or the previously stored data if 1CLKAB or 2CLKAB is low.

When 1 or 2 is high, the corresponding outputs are in the high-impedance state. 1 or 2 does not affect the operation on the internal registers. Previously stored data can be retained or new data can be entered while the outputs are in the high-impedance state.

Data flow from B to A is similar, but uses 1 and/or and 1 CLKBA and/or 2CLKBA.

The 74AC16474 is packaged in TI's shrink small-outline packages (DL) with 25-mil center-to-center pin spacings. This package provides twice the I/O pin count and functionality of a standard small-outline package in the same PCB area.

The 54AC16474 is characterized over the full military temperature range of -55°C to 125°C. The 74AC16474 is characterized for operation from -40°C to 85°C.