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74F648 Fiches technique(PDF) 2 Page - NXP Semiconductors

No de pièce 74F648
Description  Octal transceiver/register, non-inverting 3-State
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74F648 Fiches technique(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74F646/A/74F648/A
Transceivers/registers
2
1990 Sep 25
853-1124 00515
FEATURES
Combines 74F245 and two 74F374 type functions in one chip
High impedance base inputs for reduced loading (70µA in high
and low states)
Independent registers for A and B buses
Multiplexed real-time and stored data
Choice of non-inverting and inverting data paths
Controlled ramp outputs for 74F646A/74F648A
3-state outputs
300 mil wide 24-pin slim dip package
DESCRIPTION
The 74F646/74F646A and 74F648/74F648A transceivers/registers
consist of bus transceiver circuits with 3–state outputs, D–type
flip–flops, and control circuitry arranged for multiplexed transmission
of data directly from the input bus or the internal registers. Data on
the A or B bus will be clocked into the registers as the appropriate
clock pin goes high. Output enable (OE) and DIR pins 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 both.
The select (SAB, SBA) pins determine whether data is stored or
transferred through the device in real–time. The DIR determines
which bus will receive data when the OE is active low. In the
isolation mode (OE = high), data from bus A may be stored in the B
register and/or data from bus B may be stored in the A register.
When an output function is disabled, the input function is still
enabled and may be used to store and transmit data. Only one of
the two buses, A or B may be driven at a time.
TYPE
TYPICAL fmax
TYPICAL SUPPLY CURRENT ( TOTAL)
74F646/74F648
115MHz
140mA
74F646A/74F648A
185MHz
105mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
PKG DWG #
VCC = 5V ±10%, Tamb = 0°C to +70°C
24–pin plastic slim DIP
(300mil)
N74F646N, N74F646AN, N74F648N, N74F648AN
SOT222-1
24–pin plastic SOL
N74F646D, N74F646AD, N74F648D, N74F648AD
SOT137-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.) HIGH/
LOW
LOAD VALUE HIGH/
LOW
A0 – A7, B0 – B7
A and B inputs
3.5/0.116
70
µA/70µA
CPAB
A–to–B clock input
1.0/0.033
20
µA/20µA
CPBA
B–to–A clock input
1.0/0.033
20
µA/20µA
SAB
A–to–B select input
1.0/0.033
20
µA/20µA
SBA
B–to–A select input
1.0/0.033
20
µA/20µA
DIR
Data flow directional control enable input
1.0/0.033
20
µA/20µA
OE
Output enable input
1.0/0.033
20
µA/20µA
A0 – A7, B0 – B7
A, B outputs for N74F646A/N74F648A
750/80
15mA/48mA
A0 – A7, B0 – B7
A, B outputs for N74F646/N74F648
750/106.7
15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20
µA in the high state and 0.6mA in the low state.


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