參數(shù)資料
型號(hào)： SN54AS651FK
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 總線(xiàn)收發(fā)器
英文描述： AS SERIES, 8-BIT REGISTERED TRANSCEIVER, INVERTED OUTPUT, CQCC28
封裝： CERAMIC, CC-28
文件頁(yè)數(shù)： 26/34頁(yè)
文件大?。?/td> 507K
代理商： SN54AS651FK
SN54AS652, Octal Bus Transceivers And Registers With 3-State Outputs
Device Status: Active
Parameter Name SN54AS652
Voltage Nodes (V) 5
Vcc range (V)
4.5 to 5.5
Input Level
TTL
Output Level
TTL
No. of Outputs
8
Description
These devices consist of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for
multiplexed transmission of data directly from the data bus or from the internal storage registers.
Output-enable (OEAB and
) inputs are provided to control the transceiver functions.
Select-control (SAB and SBA) inputs are provided to select real-time or stored data transfer. The circuitry
used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the
transition between stored and real-time data. A low input level selects real-time data, and a high input
level selects stored data. Figure 1 illustrates the four fundamental bus-management functions that can be
performed with the octal bus transceivers and registers.
Data on the A or B data bus, or both, can be stored in the internal D-type flip-flops by low-to-high
transitions at the appropriate clock (CLKAB or CLKBA) terminals, regardless of the select- or
output-control terminals. When SAB and SBA are in the real-time transfer mode, it is possible to store
data without using the internal D-type flip-flops by simultaneously enabling OEAB and
. In this
configuration, each output reinforces its input. 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 -1 versions of the SN74ALS651A and SN74ALS652A are identical to the standard versions except
that the recommended maximum IOL for the -1 versions is increased to 48 mA. There are no -1 versions
of the SN54ALS652, SN54ALS653, SN74ALS653, and SN74ALS654.
Product Folder:SN54AS652, Octal Bus Transceivers And Registers With 3-State Outputs
file:////roarer/root/export/projects/bitting2/imagin...match/20000914/09012000/TXII/09012000/sn54as652.html (1 of 3) [9/16/2000 3:38:12 PM]
All Semiconductors
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