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54AC646 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer 54AC646
Beschreibung Octal Transceiver/Register
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 10 Seiten
54AC646 Datasheet, Funktion
www.DataSheet4U.com
August 1998
54AC646
Octal Transceiver/Register with TRI-STATE® Outputs
General Description
The ’AC646 consist of registered bus transceiver circuits,
with outputs, 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 clock pin (CPAB
or CPBA). The four fundamental data handling functions
available are illustrated in Figures 1, 2, 3, 4.
n Multiplexed real-time and stored data transfers
n TRI-STATE outputs
n 300 mil slim dual-in-line package
n Outputs source/sink 24 mA
n ’ACT646 has TTL compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC646: 5962-89682
Features
n Independent registers for A and B buses
Logic Symbols
DS100231-1
Pin Names
A0– A7
B0– B7
CPAB, CPBA
SAB, SBA
G
DIR
Description
Data Register A Inputs
Data Register A Outputs
Data Register B Inputs
Data Register B Outputs
Clock Pulse Inputs
Transmit/Receive Inputs
Output Enable Input
Direction Control Input
IEEE/IEC
DS100231-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100231
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54AC646 Datasheet, Funktion
DC Characteristics for ’AC Family Devices (Continued)
Symbol
Parameter
ICC Maximum Quiescent
Supply Current
IOZT
Maximum I/O
Leakage Current
54AC
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed
Limits
5.5 160.0
5.5 ±10.0
Units
µA
µA
Note 3: All outputs loaded; thresholds on input associated with output under test.
Note 4: Maximum test duration 2.0 ms, one output loaded at a time.
Note 5: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C.
Conditions
VIN = VCC
or GND
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
AC Electrical Characteristics
Symbol
Parameter
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
Propagation Delay
Clock to Bus
Propagation Delay
Clock to Bus
Propagation Delay
Bus to Bus
Propagation Delay
Bus to Bus
Propagation Delay
SBA or SAB to An or Bn
(w/ An or Bn HIGH or LOW)
Propagation Delay
SBA or SAB to An or Bn
(w/ An or Bn HIGH or LOW)
Enable Time
G to An or Bn
Enable Time
G to An or Bn
Disable Time
G to An or Bn
Disable Time
G to An or Bn
Enable Time
DIR to An or Bn
Enable Time
DIR to An or Bn
Disable Time
DIR to An or Bn
VCC
(V)
(Note 6)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
54AC
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
1.0 20.0
1.5 14.0
1.0 17.5
1.5 12.0
1.0 15.0
1.5 10.0
1.0 14.5
1.5 9.5
1.0 17.0
1.5 12.0
1.0 17.0
1.5 12.0
1.0 13.0
1.5 9.5
1.0 15.5
1.5 11.0
1.0 14.0
1.5 11.0
1.0 13.5
1.5 11.0
1.0 14.5
1.5 10.5
1.0 16.0
1.5 12.5
1.0 14.5
1.5 12.0
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Fig.
No.
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