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74ACT715 Datenblatt(PDF) 2 Page - Fairchild Semiconductor

Teilenummer 74ACT715
Bauteilbeschribung  Programmable Video Sync Generator
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ACT715 Datenblatt(HTML) 2 Page - Fairchild Semiconductor

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Logic Block Diagram
Pin Description
There are a Total of 13 inputs and 5 outputs on the
ACT715.
Data Inputs D0–D7: The Data Input pins connect to the
Address Register and the Data Input Register.
ADDR/DATA: The ADDR/DATA signal is latched into the
device on the falling edge of the LOAD signal. The signal
determines if an address (0) or data (1) is present on the
data bus.
L/HBYTE: The L/HBYTE signal is latched into the device
on the falling edge of the LOAD signal. The signal deter-
mines if data will be read into the 8 LSB’s (0) or the 4
MSB’s (1) of the Data Registers. A 1 on this pin when an
ADDR/DATA is a 0 enables Auto-Load Mode.
LOAD: The LOAD control pin loads data into the Address
or Data Registers on the rising edge. ADDR/DATA and L/
HBYTE data is loaded into the device on the falling edge of
the LOAD. The LOAD pin has been implemented as a
Schmitt trigger input for better noise immunity.
CLOCK: System CLOCK input from which all timing is
derived. The clock pin has been implemented as a Schmitt
trigger for better noise immunity. The CLOCK and the
LOAD signal are asynchronous and independent. Output
state changes occur on the falling edge of CLOCK.
CLR: The CLEAR pin is an asynchronous input that initial-
izes the device when it is HIGH. Initialization consists of
setting all registers to their mask programmed values, and
initializing all counters, comparators and registers. The
CLEAR pin has been implemented as a Schmitt trigger for
better noise immunity. A CLEAR pulse should be asserted
by the user immediately after power-up to ensure proper
initialization of the registers—even if the user plans to
(re)program the device.
Note: A CLEAR pulse will disable the CLOCK on the ACT715 and will
enable the CLOCK on the ACT715-R.
ODD/EVEN: Output that identifies if display is in odd
(HIGH) or even (LOW) field of interlace when device is in
interlaced mode of operation. In noninterlaced mode of
operation this output is always HIGH. Data can be serially
scanned out on this pin during Scan Mode.
VCSYNC: Outputs Vertical or Composite Sync signal
based on value of the Status Register. Equalization and
Serration pulses will (if enabled) be output on the VCSYNC
signal in composite mode only.
VCBLANK: Outputs Vertical or Composite Blanking signal
based on value of the Status Register.
HBLHDR: Outputs Horizontal Blanking signal, Horizontal
Gating signal or Cursor Position based on value of the Sta-
tus Register.
HSYNVDR: Outputs Horizontal Sync signal, Vertical Gat-
ing signal or Vertical Interrupt signal based on value of Sta-
tus Register.


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