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CY74FCT2543CTSOCT

更新时间: 2024-01-30 02:47:47
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德州仪器 - TI /
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6页 58K
描述
8-Bit Latched Transceiver

CY74FCT2543CTSOCT 数据手册

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Data sheet acquired from Cypress Semiconductor Corporation.  
Data sheet modified to remove devices not offered.  
CY74FCT2543T  
SCCS042 - September 1994 - Revised March 2000  
8-Bit Latched Transceiver  
Features  
Functional Description  
Function and pinout compatible with FCT and F logic  
FCT-C speed at 5.3 ns max.  
FCT-A speed at 6.5 ns max.  
25output series resistors to reduce transmission line  
reflection noise  
Reduced VOH (typically = 3.3V) versions of equivalent  
FCT functions  
Edge-rate control circuitry for significantly improved  
noise characteristics  
Power-off disable feature  
Matched rise and fall times  
The FCT2543T Octal Latched Tranceiver contains two sets of  
eight D-type latches. Separate Latch Enable (LEAB, LEBA)  
and Output Enable (OEAB, OEBA) permits each latch set to  
have independent control of inputting and outputting in either  
direction of data flow. For data flow from A to B, for example,  
the A-to-B Enable (CEAB) input must be LOW to enter data  
from A or to take data from B, as indicated in the truth table.  
With CEAB LOW, a LOW signal on the A-to-B Latch Enable  
(LEAB) input makes the A-to-B latches transparent; a subse-  
quent LOW-to-HIGH transition of the LEAB signal puts the A  
latches in the storage mode and their output no longer change  
with the A inputs. With CEAB and OEAB both LOW, the  
three-state B output buffers are active and reflect data present  
at the output of the A latches. Control of data from B to A is  
similar, but uses CEAB, LEAB, and OEAB inputs. On-chip ter-  
mination resistors have been added to the outputs to reduce  
system noise caused by reflections. The FCT2543T can be  
used to replace the FCT543T to reduce noise in an existing  
design.  
Fully compatible with TTL input and output logic levels  
• Sink current  
Source current  
12 mA  
15 mA  
• Separation controls for data flow in each direction  
Back to back latches for storage  
• ESD > 2000V  
• Extended commercial temp. range of –40˚C to +85˚C  
The outputs are designed with a power-off disable feature to  
allow for live insertion of boards.  
Functional Block Diagram  
Pin Configurations  
Detail A  
SOIC/QSOP  
Top View  
B
D Q  
LE  
0
LEBA  
OEBA  
V
CC  
1
2
3
4
5
6
7
8
9
24  
23  
22  
21  
20  
19  
18  
17  
16  
A
0
Q D  
LE  
CEBA  
A
0
B
0
A
1
B
1
B
B
B
B
B
B
B
A
A
2
B
2
1
2
3
4
5
6
7
1
A
2
A
3
B
3
A
4
B
4
A
3
A
5
B
5
A
4
Detail A x 7  
A
6
B
6
A
5
A
7
B
7
10  
11  
12  
15  
14  
13  
A
6
CEAB  
GND  
LEAB  
OEAB  
A
7
OEBA  
FCT2543T3  
OEAB  
CEBA  
LEBA  
CEAB  
LEAB  
FCT2543T1  
Copyright © 2000, Texas Instruments Incorporated  

CY74FCT2543CTSOCT 替代型号

型号 品牌 替代类型 描述 数据表
CY74FCT2543ATSOCT TI

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