5895 Datasheet, PDF (4/8 Pages) Allegro MicroSystems – BiMOS II 8-BIT SERIAL INPUT, LATCHED SOURCE DRIVERS

5895
8-BIT SERIAL-INPUT,
LATCHED DRIVERS
CLOCK
DATA IN
STROBE
A
D
B
E
F
C
BLANKING
G
OUT_N
Dwg. No. A-12,649A
TIMING CONDITIONS
(V_DD = 5.0 V, Logic Levels are V_DD and Ground)
A.
Minimum Data Active Time Before Clock Pulse
(Data Set-Up Time) ................................................................. 75 ns
B.
Minimum Data Active Time After Clock Pulse
(Data Hold Time) ..................................................................... 75 ns
C.
Minimum Data Pulse Width ........................................................ 150 ns
D.
Minimum Clock Pulse Width ...................................................... 150 ns
E.
Minimum Time Between Clock Activation and Strobe ............... 300 ns
F.
Minimum Strobe Pulse Width ..................................................... 100 ns
G.
Typical Time Between Strobe Activation and
Output Transition .................................................................... 1.0 µs
Serial Data present at the input is transferred to the shift register
on the logic “0” to logic “1” transition of the CLOCK input pulse. On
succeeding CLOCK pulses, the registers shift data information towards
the SERIAL DATA OUTPUT. The SERIAL DATA must appear at the
input prior to the rising edge of the CLOCK input waveform.
Information present at any register is transferred to its respective
latch when the STROBE is high (serial-to-parallel conversion). The
latches will continue to accept new data as long as the STROBE is
held high. Applications where the latches are bypassed (STROBE tied
high) will require that the OUTPUT ENABLE input be high during serial
data entry.
When the OUTPUT ENABLE input is high, all of the output buffers
are disabled (OFF) without affecting the information stored in the
latches or shift register. With the OUTPUT ENABLE input low, the
outputs are controlled by the state of their respective latches.
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