SN74ALVC16841
20-BIT BUS-INTERFACE D-TYPE LATCH
WITH 3-STATE OUTPUTS

SCAS274 - JANUARY 1993 - REVISED MARCH 1994

features

• Member of the Texas Instruments Widebus^TM Family
• EPIC^TM (Enhanced-Performance Implanted CMOS) Submicron Process
• Designed to Facilitate Incident-Wave Switching for Line Impedances of 50-or Greater
• Typical V_OLP (Output Ground Bounce) < 0.8 V at V_CC = 3.3 V, T_A = 25°C
• Typical V_OHV (Output V_OH Undershoot) > 2 V at V_CC = 3.3 V, T_A = 25°C
• Bus-Hold On Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
• Package Options Include Plastic 300-mil Shrink Small-Outline (DL) and Thin Shrink Small-Outline (DGG) Packages

EPIC and Widebus are trademarks of Texas Instruments Incorporated.

description

This 20-bit bus-interface D-type latch is designed for 2.7-V to 3.6-V V_CC operation.

The SN74ALVC16841 features 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for implementing buffer registers, unidirectional bus drivers, and working registers.

The SN74ALVC16841 can be used as two 10-bit latches or one 20-bit latch. The twenty latches are transparent D-type latches. The device has noninverting data (D) inputs and provides true data at its outputs. While the latch-enable (1LE or 2LE) input is high, the Q outputs of the corresponding 10-bit latch follow the D inputs. When LE is taken low, the Q outputs are latched at the levels that were set up at the D inputs.

A buffered output-enable (1 or 2) input can be used to place the outputs of the corresponding 10-bit latch in either a normal logic state (high or low) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.

The output-enable () input does not affect the internal operation of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

The SN74ALVC16841 is available in TI's shrink small-outline (DL) and thin shrink small-outline (DGG) packages, which provide twice the I/O pin count and functionality of standard small-outline packages in the same printed-circuit-board area.

The SN74ALVC16841 is characterized for operation from -40°C to 85°C.