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54AC16652 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
54AC16652 16-BIT BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS TI
Texas Instruments TI
54AC16652 Datasheet PDF : 13 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
54AC16652, 74AC16652
16-BIT BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS242A – MARCH 1990 – REVISED APRIL 1996
description (continued)
Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the
appropriate clock (CLKAB or CLKBA) inputs regardless of the levels on the select-control or output-enable
inputs. When SAB and SBA are in the real-time transfer mode, it is also possible to store data without using the
internal D-type flip-flops by simultaneously enabling OEAB and OEBA. In this configuration, each output
reinforces its input. Thus, when all other data sources to the two sets of bus lines are at high impedance, each
set of bus lines remains at its last state.
The 74AC16652 is packaged in TI’s shrink small-outline package (DL), which provides twice the I/O pin count
and functionality of standard small-outline packages in the same printed-circuit-board area.
The 54AC16652 is characterized for operation over the full military temperature range of –55°C to 125°C. The
74AC16652 is characterized for operation from –40°C to 85°C.
OEAB
OEBA
INPUTS
CLKAB CLKBA
SAB
FUNCTION TABLE
DATA I/O†
SBA
A1–A8
B1–B8
OPERATION OR FUNCTION
L
H
L
L
X
X
Input
Input
Isolation
L
H
X
H
H
H
L
X
L
L
L
X
X
Input
Input
L
X
X
Input
Unspecified‡
X‡
X
Input
Output
X
X
Unspecified‡
Input
X
X‡
Output
Input
Store A and B data
Store A, hold B
Store A in both registers
Hold A, store B
Store B in both registers
L
L
X
X
X
L
Output
Input
Real-time B data to A bus
L
L
X
L
X
H
Output
Input
Stored B data to A bus
H
H
X
X
L
X
Input
Output
Real-time A data to B bus
H
H
L
X
H
X
Input
Output
Stored A data to B bus
H
L
L
L
H
H
Output
Output
Stored A data to B bus and
stored B data to A bus
The data-output functions may be enabled or disabled by a variety of level combinations at OEAB or OEBA. Data-input functions are always
enabled; i.e., data at the bus terminals is stored on every low-to-high transition on the clock inputs.
Select control = L; clocks can occur simultaneously.
Select control = H; clocks must be staggered in order to load both registers.
2
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