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參數(shù)資料
| 型號： | SN54ABTH32952 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 32 Bit Registered Bus Transceivers With 3-State Outputs(32位記錄總線收發(fā)器(三態(tài)輸出)) |
| 中文描述： | 32位注冊總線收發(fā)器與三態(tài)輸出（32位記錄總線收發(fā)器（三態(tài)輸出）） |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 117K |
| 代理商： | SN54ABTH32952 |
SN54ABT32952, SN74ABT32952
32-BIT REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS231A – JUNE 1992 – REVISED JULY 1994
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The
′
ABT32952 is a 32-bit (quad 8-bit) transceiver with edge-triggered D-type flip-flops and 3-state outputs
designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for
implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The
′
ABT32952 can
be used as four 8-bit flip-flops, two 16-bit flip-flops, or one 32-bit flip-flop. Provided that the clock-enable
(CLKENAB or CLKENBA) input is low on the positive transition of the clock (CLKAB or CLKBA) input, the output
(B or A) of the flip-flop takes on the logic level set up at the input (A or B). The
′
ABT32952 allows data
transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic levels at the
output-enable inputs.
A buffered output-enable (OEAB or OEBA) input can be used to place the 32 outputs 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 high-impedance state and the increased drive provide the capability to drive bus
lines without need for interface or pullup components.
The OEAB or OEBA do not affect the internal operations of the flip-flop. Old data can be retained or new data
can be entered while the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver (A to B).
OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the
current-sourcing capability of the driver (B to A).
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN54ABT32952 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C.
The SN74ABT32952 is characterized for operation from –40
°
C to 85
°
C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
B
CLKENAB
L
OEAB
L
CLKAB
↑
↑
X
A
H
H
L
L
L
L
H
L
X
Q0
Q0
Z
X
L
L
X
X
H
X
X
A-to-B data flow is shown; B-to-A data flow is similar
but uses CLKENBA, OEBA, and CLKBA.
P
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| SN74ABTH32952 | 32 Bit Registered Bus Transceivers With 3-State Outputs(32位記錄總線收發(fā)器(三態(tài)輸出)) |
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