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74FCT16646TPVCTG4 Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza 74FCT16646TPVCTG4
Descripción Electrónicos  16-Bit Registered Transceivers
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74FCT16646TPVCTG4 Datasheet(HTML) 1 Page - Texas Instruments

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16-Bit Registered Transceivers
CY74FCT16646T
CY74FCT162646T
SCCS060B - August 1994 - Revised September 2001
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
Copyright
© 2001, Texas Instruments Incorporated
Features
•Ioff supports partial-power-down mode operation
• Edge-rate control circuitry for significantly improved
noise characteristics
• Typical output skew < 250 ps
• ESD > 2000V
• TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
• Industrial temperature range of
−40˚C to +85˚C
•VCC = 5V ± 10%
CY74FCT16646T Features:
• 64 mA sink current, 32 mA source current
• Typical VOLP (ground bounce) <1.0V at VCC = 5V,
TA = 25˚C
CY74FCT162646T Features:
• Balanced 24 mA output drivers
• Reduced system switching noise
• Typical VOLP (ground bounce) <0.6V at VCC = 5V,
TA= 25˚C
Functional Description
The
CY74FCT16646T
and
CY74FCT162646T
16-bit
transceivers are three-state, D-type registers, 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. Output Enable (OE) and
direction pins (DIR) are provided to control the transceiver
function. In the transceiver mode, data present at the high
impedance port may be stored in either the A or 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 Output Enable (OE) is
Active LOW. In the isolation mode (Output Enable (OE) HIGH),
A data may be stored in the B register and/or B data may be
stored in the A register.
This
device
is
fully
specified
for
partial-power-down
applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.
The
CY74FCT16646T
is
ideally
suited
for
driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162646T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for
minimal undershoot and reduced ground bounce. The
CY74FCT162646T is ideal for driving transmission lines.
Logic Block Diagrams
FCT16646-1
C
D
1B1
C
D
1A1
TO 7 OTHER CHANNELS
1SAB
1CLKAB
1CLKBA
1DIR
1SBA
1OE
B REG
A REG
C
D
2B1
C
D
2A1
2SAB
2CLKAB
2CLKBA
2DIR
2SBA
2OE
B REG
FCT16646-2
TO 7 OTHER CHANNELS
A REG


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