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DM74ALS652

更新时间: 2024-11-22 22:56:51
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 总线收发器
页数 文件大小 规格书
6页 61K
描述
Octal 3-STATE Bus Transceiver and Register

DM74ALS652 数据手册

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October 1986  
Revised March 2000  
DM74ALS652  
Octal 3-STATE Bus Transceiver and Register  
General Description  
This device incorporates an octal transceiver and an octal  
D-type register configured to enable transmission of data  
from bus to bus or internal register to bus.  
Features  
Switching specifications at 50 pF  
Switching specifications guaranteed over full tempera-  
ture and VCC range  
This bus transceiver features totem-pole 3-STATE outputs  
designed specifically for driving highly-capacitive or rela-  
tively low-impedance loads. The high-impedance state and  
increased high level logic drive provide this device with the  
capability of being connected directly to and driving the bus  
lines in a bus organized system without need for interface  
or pull-up components. They are particularly attractive for  
implementing buffer registers, I/O ports, bidirectional bus  
drivers, and working registers.  
Advanced oxide-isolated, ion-implanted Schottky TTL  
process  
3-STATE buffer-type outputs drive bus lines directly  
Independent registers and enables for A and B buses  
Multiplexed real-time and stored data  
The registers in the DM74ALS652 are edge-triggered D-  
type flip-flops. On the positive transition of the clock (CAB  
or CBA), the input data is stored into the appropriate regis-  
ter. The CAB input controls the transfer of data into the A  
register and the CBA input controls the B register.  
The SAB and SBA control pins are provided to select  
whether real-time data or stored data is transferred. A LOW  
input level selects real-time data and a HIGH level selects  
stored data. The select controls have a “make before  
break” configuration to eliminate a glitch which would nor-  
mally occur in a typical multiplexer during the transition  
between stored and real-time data.  
The enable (GAB and GBA) control pins provide four  
modes of operation: real-time data transfer from bus A to  
B, real-time data transfer from bus B to A, real-time bus A  
and/or B data transfer to internal storage, or internal stored  
data transfer to bus A and/or B.  
Ordering Code:  
Order Number  
DM74ALS652WM  
DM74ALS652NT  
Package Number Package Description  
M24B  
N24C  
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide  
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide  
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.  
Connection Diagram  
© 2000 Fairchild Semiconductor Corporation  
DS009174  
www.fairchildsemi.com  

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