54ACT16470, 74ACT16470
16-BIT REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCAS237A - JUNE 1990 - REVISED APRIL 1996

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

features

• Members of the Texas Instruments Widebus^TM Family
• Inputs Are TTL-Voltage Compatible
• Flow-Through Architecture Optimizes 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
• Package Options Include Shrink Small-Outline 300-mil (DL) Packages Using 25-mil Center-to-Center Pin Spacings and 380-mil Fine-Pitch Ceramic Flat (WD) Packages Using 25-mil Center-to-Center Pin Spacings

EPIC and Widebus are trademarks of Texas Instruments Incorporated.

description

The 'ACT16470 are 16-bit registered transceivers that contain two sets of D-type flip-flops for temporary storage of data flowing in either direction. They can be used as two 8-bit transceivers or one 16-bit transceiver. Separate clock (CLKAB or CLKBA) and output-enable ( or ) inputs are provided for each register to permit independent control in either direction of data flow.

The A-to-B enable () input must be low to enter data from A or to output data to B. If both and CLKAB are low, then B port will have the level of A port prior to the most recent low-to-high transition of CLKAB. Data flow from B to A is similar, but requires the use of , CLKBA, and inputs.

To avoid false clocking of the flip-flops, should not be switched from high to low while CLK is high.

The 74ACT16470 is packaged in TI's shrink small-outline package, which provides twice the I/O pin count and functionality of standard small-outline packages in the same printed-circuit-board area.

The 54ACT16470 is characterized for operation over the full military temperature range of -55°C to 125°C. The 74ACT16470 is characterized for operation from -40°C to 85°C.

A-to-B data flow is shown: B-to-A flow is similar but uses , CLKBA, and .

Output level before the indicated steady-state input conditions were established