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74ABT646 Folha de dados(PDF) 1 Page - Fairchild Semiconductor

Nome de Peças 74ABT646
Descrição Electrónicos  Octal Transceivers and Registers with 3-STATE Outputs
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 1999 Fairchild Semiconductor Corporation
DS010978
www.fairchildsemi.com
April 1992
Revised November 1999
74ABT646
Octal Transceivers and Registers with 3-STATE Outputs
General Description
The ABT646 consists of bus transceiver circuits with 3-
STATE, D-type flip-flops, and control circuitry arranged for
multiplexed transmission of data directly from the input bus
or from the internal registers. Data on the A or B bus will be
clocked into the registers as the appropriate clock pin goes
to a high logic level. Control OE and direction pins are pro-
vided to control the transceiver function. In the transceiver
mode, data present at the high impedance port may be
stored in either the A or the B register or in both. The select
controls can multiplex stored and real-time (transparent
mode) data. The direction control determines which bus
will receive data when the enable control OE is Active
LOW. In the isolation mode (control OE HIGH), A data may
be stored in the B register and/or B data may be stored in
the A register.
Features
s Independent registers for A and B buses
s Multiplexed real-time and stored data
s A and B output sink capability of 64 mA, source capabil-
ity of 32 mA
s Guaranteed output skew
s Guaranteed multiple output switching specifications
s Output switching specified for both 50 pF and 250 pF
loads
s Guaranteed simultaneous switching noise level and
dynamic threshold performance
s Guaranteed latchup protection
s High impedance glitch free bus loading during entire
power up and power down cycle
s Nondestructive hot insertion capability
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagram
Pin Descriptions
Order Number
Package Number
Package Description
74ABT646CSC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-153, 4.4mm Wide
74ABT646CMSA
MSA24
24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74ABT646CMTC
MTC24
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names
Description
A0–A7
Data Register A Inputs/3-STATE Outputs
B0–B7
Data Register B Inputs/3-STATE Outputs
CPAB, CPBA
Clock Pulse Inputs
SAB, SBA
Select Inputs
OE
Output Enable Input
DIR
Direction Control Input


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