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参数资料
| 型号： | ICM7218BIJIR5254 |
| 厂商： | Intersil |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER DECODER 8DIG 28-CERDIP |
| 标准包装： | 143 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 数字或字符： | 8 位数字 |
| 电流 - 电源： | 700µA |
| 电源电压： | 4 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-CDIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-CDIP 熔接密封，带窗口 |
| 包装： | 管件 |
ICM7218
FIGURE 2. MULTIPLEX TIMING (COMMON CATHODE VERSION)
sign (-), a blank (for leading zero blanking), certain useful
alpha characters and all numeric formats.
The four bit binary code is set up on inputs lD3-lD0, and
decimal point data is set up on ID7.
DECIMAL 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
15
FIGURE 3. SEGMENT ASSIGNMENTS
HEXA
0 1 2 3 4 5 6 7 8 9 A
B C D E
F
CODE
Detailed Description
CODE B
0 1 2 3 4 5 6 7 8 9
-
E H
L
P (BLANK)
DECODE Operation
For the lCM7218A/B products, there are 3 input data formats
possible; either direct segment and decimal point information (8
bits per digit) or two Binary formats plus decimal point
information (Hexadecimal/Code B formats with 5 bits per digit).
The 7-segment decoder on chip is disabled when direct
segment information is to be written. In this format, the
inputs directly control the outputs as follows:
SHUTDOWN
SHUTDOWN performs several functions: it puts the device
into a very low dissipation mode (typically 10 μ A at V DD = 5V),
turns off both the digit and segment drivers, and stops the
multiplex scan oscillator (this is the only way the scan
oscillator can be disabled). However, it is still possible to input
data to the memory during shutdown - only the display output
sections of the device are disabled in this mode.
Input Data:
ID7
lD6
ID5 lD4 lD3 lD2 lD1 ID0
Powerdown
Output Segments:
D.P.
a
b
c
e
g
f
d
In the Shutdown Mode, the supply voltage may be reduced to
2V without data in memory being lost. However, data should
Here, "Ones" represent "on" segments for all inputs except
the Decimal Point. For the Decimal Point "zero" represents
an "on" segment.
HEXAdecimal/CODE B Decoding
For all products, a choice of either HEXA or Code B decoding
may be made. HEXA decoding provides 7-segment numeric
plus six alpha characters while Code B provides a negative
5
not be written into memory if the supply voltage is less than 4V.
Output Drive
The common anode output drive is approximately 200mA per
digit at a 12% duty cycle. With segment peak drive current of
40mA typically, this results in 5mA average drive. The common
cathode drive capability is approximately one-half that of the
common anode drive. If high impedance LED displays are
used, the drive current will be correspondingly less.
FN3159.2
February 15, 2007
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