Datasheet

SN54ABT16646, SN74ABT16646
16-BIT BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCBS212D – JUNE 1992 – REVISED JULY 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description (continued)
The SN54ABT16646 is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74ABT16646 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
DATA I/O
†
OPERATION OR FUNCTION
OE DIR CLKAB CLKBA SAB SBA A1–A8 B1–B8
OPERATION
OR
FUNCTION
X X ↑ X X X Input Unspecified Store A, B unspecified
X XX ↑ X X Unspecified Input Store B, A unspecified
H X ↑ ↑ X X Input Input Store A and B data
H X H or L H or L X X Input disabled Input disabled Isolation, hold storage
L L X X X L Output Input Real-time B data to A bus
L L X H or L X H Output Input Stored B data to A bus
L H X X L X Input Output Real-time A data to B Bus
L H H or L X H X Input Output Stored A data to bus
†
The data-output functions can be enabled or disabled by various signals at OE or DIR. Data-input functions always are enabled, i.e., data at the
bus terminals is stored on every low-to-high transition of the clock inputs.