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74LCX646 Datenblatt(PDF) 1 Page - Fairchild Semiconductor

Teilenummer 74LCX646
Bauteilbeschribung  Low Voltage Octal Transceiver/Register with 5V Tolerant Inputs and Outputs
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2001 Fairchild Semiconductor Corporation
DS011997
www.fairchildsemi.com
February 1994
Revised March 2001
74LCX646
Low Voltage Octal Transceiver/Register
with 5V Tolerant Inputs and Outputs
General Description
The LCX646 consists of registered bus transceiver circuits,
D-type flip-flops, and control circuitry providing multiplexed
transmission of data directly from the input bus or from the
internal storage registers. Data on the A or B bus will be
loaded into the respective registers on the LOW-to-HIGH
transition of the appropriate pin (CPAB or CPBA) (see
Functional Description).
The LCX646 is designed for low voltage (2.5V or 3.3V) VCC
applications with capability of interfacing to a 5V signal
environment.
The LCX646 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
s 5V tolerant inputs and outputs
s 2.3V
− 3.6V V
CC specifications provided
s 7.0 ns tPD max (VCC = 3.3V), 10 µA ICC max
s Power down high impedance inputs and outputs
s Supports live insertion/withdrawal (Note 1)
s
±24 mA output drive (V
CC = 3.0V)
s Implements patented noise/EMI reduction circuitry
s Latch-up performance exceeds 500 mA
s ESD performance:
Human body model
> 2000V
Machine model
> 200V
Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to VCC through a pull-up resistor: the minimum value or the
resistor is determined by the current-sourcing capability of the driver.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Pin Descriptions
Order Number
Package Number
Package Description
74LCX646WM
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74LCX646MSA
MSA24
24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCX646MTC
MTC24
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names
Description
A0–A7
Data Register A Inputs
Data Register A Outputs
B0–B7
Data Register B Inputs
Data Register B Outputs
CPAB, CPBA
Clock Pulse Inputs
SAB, SBA
Transmit/Receive Inputs
OE
Output Enable Input
DIR
Direction Control Input


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