MAX6921AQI(2003) データシートの表示（PDF） - Maxim Integrated

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MAX6921AQI
(Rev.:2003)

20-Output, 76V, Serial-Interfaced VFD Tube Drivers

Maxim Integrated 

20-Output, 76V, Serial-Interfaced

VFD Tube Drivers

PIN

TSSOP

MAX6931 MAX6921

1–5, 10–19,

—

24–28

—

1–5, 10–19,

24–28

WIDE SO/

PLCC

—

3–12,

17–26

—

9

2

6

6

27

7

7

28

8

8

1

9

—

—

20

20

13

21

21

14

22

22

15

23

23

16

Pin Description

NAME

FUNCTION

OUT0 to VFD Anode and Grid Drivers. OUT0 to OUT19 are push-pull outputs swinging

OUT19 from VBB to VSS.

OUT0 to VFD Anode and Grid Drivers. OUT0 to OUT19 are push-pull outputs swinging

OUT19 from VBB to GND.

DOUT

Serial-Clock Output. Data is clocked out of the internal shift-register to DOUT

on CLK’s rising edge.

DIN

Serial-Data Input. Data is loaded into the internal shift register on CLK’s rising

edge.

VCC

VBB

VSS

BLANK

GND

Logic Supply Voltage

VFD Tube Supply Voltage

Filament Bias Supply Voltage

Blanking Input. High forces outputs OUT0 to OUT19 low, without altering the

contents of the output latches. Low enables outputs OUT0 to OUT19 to follow

the state of the output latches.

Ground

CLK Serial-Clock Input. Data is loaded into the internal shift register on CLK’s

rising edge.

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.

CLK

DIN

LOAD

BLANK

SERIAL-TO-PARALLEL SHIFT REGISTER

LATCHES

MAX6921 ONLY

DOUT

MAX6921

MAX6931

OUT0 OUT1 OUT2

OUT19

Figure 1. MAX6921/MAX6931 Functional Diagram

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