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74VHC245 Datasheet دیتاشیت PDF دانلود

دیتاشیت - Fairchild Semiconductor - Octal Bidirectional Transceiver with 3-STATE Outputs

شماره قطعه 74VHC245
شرح مفصل Octal Bidirectional Transceiver with 3-STATE Outputs
تولید کننده Fairchild Semiconductor 
آرم Fairchild Semiconductor 


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74VHC245 شرح
November 1992
Revised March 1999
74VHC245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
The VHC245 is an advanced high speed CMOS octal bus
transceiver fabricated with silicon gate CMOS technology.
It achieves high speed operation similar to equivalent Bipo-
lar Schottky TTL while maintaining the CMOS low power
dissipation. The VHC245 is intended for bidirectional asyn-
chronous communication between data busses. The direc-
tion of data transmission is determined by the level of the
T/R input. The enable input can be used to disable the
device so that the busses are effectively isolated. All inputs
are equipped with protection circuits against static dis-
charge.
Features
s High Speed: tPD = 4.0 ns (typ) at VCC = 5V
s High Noise Immunity: VNIH = VNIL = 28% VCC (Min)
s Power Down Protection is provided on all inputs
s Low Noise: VOLP = 0.9V (typ)
s Low Power Dissipation:
ICC = 4 µA (Max) @ TA = 25°C
s Pin and Function Compatible with 74HC245
Ordering Code:
Order Number Package Number
Package Description
74VHC245M
M20B
20-Lead Small Outline Integrated Package (SOIC), JEDEC MS-013, 0.300” Wide
74VHC245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHC245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC245N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
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 Description
Pin
Names
OE
T/R
A0–A7
B0–B7
Description
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
© 1999 Fairchild Semiconductor Corporation DS011520.prf
Truth Table
Inputs
Outputs
OE T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
Any unused bus terminals during HIGH-Z State must be held HIGH or
LOW.
www.fairchildsemi.com

قانون اساسیصفحه 6
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