参数资料
| 型号： | MAX6934AQH+TD |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC DRVR VFD TUBE SRL 44PLCC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 500 |
| 显示器类型： | 真空荧光 (VF) |
| 接口： | 4 线串行 |
| 电流 - 电源： | 2mA |
| 电源电压： | 8 V ~ 76 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC（16.59x16.59） |
| 包装： | 带卷 (TR) |
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Table 1. 4-Wire Serial Interface Truth Table
DATA
SERIAL CLOCK SHIFT REGISTER CONTENTS LOAD
INPUT INPUT
LATCH CONTENTS
BLANKING
INPUT
OUTPUT CONTENTS
INPUT
DIN
CLK D0 D1 D2 … Dn-2 Dn-1 LOAD D0 D1 D2 … Dn-2 Dn-1 BLANK D0 D1 D2 … Dn-2 Dn-1
H
L
H
L
R0 R1 … Rn-2 Rn-1
R0 R1 … Rn-2 Rn-1
X
R0
R1 R2 … Rn-1
Rn
X
X
X
…
X
X
L
R0 R1 R2
… Rn-1 Rn
P0
P1
P2 … Pn-1
Pn
H
P0
X
P1
X
P2
X
… Pn-1
…
X
Pn
X
L
H
P0
L
P1 P2 … Pn-1
L
L
…
L
Pn
L
L = Low logic level.
H = High logic level.
X = Don’t care.
P = Present state (shift register).
R = Previous state (latched).
clocked in are loaded. Therefore, multiple devices can
share CLK and DIN, as long as they have unique LOAD
controls.
Determining Driver Output Voltage Drop
The outputs are CMOS drivers, and have a resistive
characteristic. The typical and maximum sink and
source output resistances can be calculated from the
V H and V L electrical characteristics. Use this calculated
resistance to determine the output voltage drop at dif-
ferent output currents.
Output Current Ratings
The continuous current-source capability is 40mA per
output. Outputs may drive up to 75mA as a repetitive
peak current, subject to the on-time (output high) being
no longer than 1ms, and the duty cycle being such that
the output power dissipation is no more than the dissipa-
tion for the continuous case. The repetitive peak rating
allows outputs to drive a higher current in multiplex grid
driver applications, where only one grid is on at a time,
and the multiplex time per grid is no more than 1ms.
Paralleling Outputs
Any number of outputs within the same package may
be paralleled in order to raise the current drive or
reduce the output resistance. Only parallel outputs
directly (by shorting outputs together) if the interface
control can be guaranteed to set the outputs to the
same level. Although the sink output is relatively weak
(typically 750 ? ), that resistance is low enough to dissi-
pate 530mW when shorted to an opposite level output
at a V BB voltage of only 20V. A safe way to parallel out-
puts is to use diodes to prevent the outputs from sink-
ing current (Figure 5). Because the diodes also stop
the outputs from sinking current from the VFD tube, an
external discharge resistor, R, is required. For static
tubes, R can be a large value such as 100k ? . For multi-
plexed tubes, the value of the resistor can be deter-
mined by the load capacitance and timing
Since dissipation is proportional to current squared, the
maximum current that can be delivered for a given mul-
tiplex ratio is given by:
I PEAK = (grids x 1600) 1/2 mA
MAX6922
MAX6932
MAX6933 OUT0
MAX6934
D1
D2
OUTPUT
where grids is the number of grids in a multiplexed
display.
This means that a duplex application (two grids) can use
a repetitive peak current of 56.5mA, a triplex (three grids)
application can use a repetitive peak current of 69.2mA,
and higher multiplex ratios are limited to 75mA.
Figure 5. Paralleling Outputs
OUT1
R
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9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6934ATH | 功能描述:VFD驱动器 RoHS:否 制造商:Maxim Integrated 工作电源电压:8 V to 76 V, 3 V to 5.5 V 电源电流:0.9 mA, 700 uA 最大工作温度:+ 125 C 封装 / 箱体:SOIC-20 封装:Tube |
| MAX6934ATH+T | 功能描述:VFD驱动器 RoHS:否 制造商:Maxim Integrated 工作电源电压:8 V to 76 V, 3 V to 5.5 V 电源电流:0.9 mA, 700 uA 最大工作温度:+ 125 C 封装 / 箱体:SOIC-20 封装:Tube |
| MAX6934ATH-T | 功能描述:VFD驱动器 RoHS:否 制造商:Maxim Integrated 工作电源电压:8 V to 76 V, 3 V to 5.5 V 电源电流:0.9 mA, 700 uA 最大工作温度:+ 125 C 封装 / 箱体:SOIC-20 封装:Tube |
| MAX693AC/D | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX693ACPE | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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