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74VHCT245ASJX PDF预览

74VHCT245ASJX

更新时间: 2024-11-03 23:24:39
品牌 Logo 应用领域
其他 - ETC 总线收发器
页数 文件大小 规格书
6页 89K
描述
Single 8-bit Bus Transceiver

74VHCT245ASJX 数据手册

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March 1997  
Revised March 1999  
74VHCT245A  
Octal Buffer/Line Driver with 3-STATE Outputs  
supply voltage. These circuits prevent device destruction  
General Description  
due to mismatched supply and input/output voltages. This  
device can be used to interface 5V to 3V systems and two  
supply systems such as battery back up.  
The VHCT245A is an advanced high speed CMOS octal  
bus transceiver fabricated with silicon gate CMOS technol-  
ogy. It achieves high speed operation similar to equivalent  
Bipolar Schottky TTL while maintaining the CMOS low  
power dissipation. The VHCT245A is intended for bidirec-  
tional asynchronous communication between data busses.  
The direction of data transmission is determined by the  
level of the T/R input. The enable input can be used to dis-  
able the device so that the busses are effectively isolated.  
Note 1: Outputs in OFF-State  
Features  
High Speed:  
Power Down Protection on Inputs and Outputs  
Low Power Dissipation: CC = 4 µA (Max) @ TA = 25°C  
tPD = 5.4 ns (typ) at VCC = 5V  
I
Protection circuits ensure that 0V to 7V can be applied to  
the input and output (Note 1) pins without regard to the  
Pin and Function Compatible with 74HCT245  
Ordering Code:  
Order Number  
74VHCT245AM  
74VHCT245ASJ  
74VHCT245AMTC  
74VHCT245AN  
Package Number  
M20B  
Package Description  
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide  
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide  
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide  
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide  
M20D  
MTC20  
N20A  
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.  
Logic Symbol  
Connection Diagram  
IEEE/IEC  
Pin Descriptions  
Truth Table  
Pin Names  
Description  
Inputs  
Outputs  
OE  
Output Enable Input  
OE  
L
T/R  
L
T/R  
Transmit/Receive Input  
Bus B Data to Bus A  
Bus A Data to Bus B  
HIGH-Z State  
A0–A7  
B0–B7  
Side A Inputs or 3-STATE Outputs  
Side B Inputs or 3-STATE Outputs  
L
H
H
X
H = HIGH Voltage Level  
L = LOW Voltage Level  
X = Immaterial  
© 1999 Fairchild Semiconductor Corporation  
DS500004.prf  
www.fairchildsemi.com  

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