Rainbow Electronics MAX6920 - Manual (Page 5)

MAX6920
12-Output, 76V, Serial-Interfaced
VFD Tube Driver
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PIN NAME FUNCTION
1 V BB VFD Tube Supply Voltage
2 DOUT Serial-Clock Output. Data is clocked out of the internal shift register to DOUT on CLK’s rising edge.
3–8, 13–18
OUT0 to
OUT11
VFD Anode and Grid Drivers. OUT0 to OUT11 are push-pull outputs swinging from V BB to GND.
9 BLANK
Blanking Input. High forces outputs OUT0 to OUT11 low, without altering the contents of the output
latches. Low enables outputs OUT0 to OUT11 to follow the state of the output latches.
10 GND Ground
11 CLK Serial-Clock Input. Data is loaded into the internal shift register on CLK’s rising edge.
12 LOAD
Load Input. Data is loaded transparently from the internal shift register to the output latch while LOAD
is high. Data is latched into the output latch on LOAD's rising edge, and retained while LOAD is low.
19 DIN Serial-Data Input. Data is loaded into the internal shift register on CLK’s rising edge.
20 V CC Logic Supply Voltage
Pin Description
SERIAL-TO-PARALLEL SHIFT REGISTER
LATCHES
CLK
DIN
LOAD
BLANK
OUT0 OUT1 OUT2 OUT11
DOUT
MAX6920
Figure 1. MAX6920 Functional Diagram