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PDF 74VHCT245A Data sheet ( Hoja de datos )
| Número de pieza | 74VHCT245A | |
| Descripción | Octal Buffer/Line Driver with 3-STATE Outputs | |
| Fabricantes | Fairchild Semiconductor | |
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March 1997
Revised March 1999
74VHCT245A
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
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.
Protection circuits ensure that 0V to 7V can be applied to
the input and output (Note 1) pins without regard to the
supply voltage. These circuits prevent device destruction
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.
Note 1: Outputs in OFF-State
Features
s High Speed: tPD = 5.4 ns (typ) at VCC = 5V
s Power Down Protection on Inputs and Outputs
s Low Power Dissipation: ICC = 4 µA (Max) @ TA = 25°C
s Pin and Function Compatible with 74HCT245
Ordering Code:
Order Number Package Number
Package Description
74VHCT245AM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74VHCT245ASJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHCT245AMTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHCT245AN
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 Descriptions
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
Truth Table
Inputs
OE T/R
LL
LH
HX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
© 1999 Fairchild Semiconductor Corporation DS500004.prf
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
www.fairchildsemi.com
1 page  
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC20
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet 74VHCT245A.PDF ] | |
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