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IN5851N 参数 Datasheet PDF下载

IN5851N图片预览
型号: IN5851N
PDF下载: 下载PDF文件 查看货源
内容描述: 与重拨脉冲拨号器 [PULSE DIALER WITH REDIAL]
分类和应用: 脉冲
文件页数/大小: 7 页 / 252 K
品牌: INTEGRAL [ INTEGRAL CORP. ]
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IN5851N  
PIN DESCRIPTION  
NAME  
PIN  
DESCRIPTION  
VCC  
1
Positive supply pin.  
The voltage on this pin is measured relative to Pin 6 and is supplied from a 150µA  
current source. This voltage should be regulated to less than 6.0 volts using on  
external form or regulation.  
VREF  
2
The VREF output provides reference  
voltage that tracks internal parameters  
of the IN5851N. VREF provides a  
negative voltage reference to the VCC  
supply. Its magnitude will be  
approximately 0.6 volt higher than  
the minimum operating voltage of  
each particular IN5851N.  
.
The typical application would be to  
connect the VREF pin to the GND pin  
(Pin 6). The supply to the VCC pin  
(Pin 1) should then be regulated to  
150µA (IOP max). with this amount of  
supply current, operation of the  
IN5851N is guaranteed.  
The internal circuit of the VREF  
function is shown in Figure 1 with its  
associated I-V characteristic  
___ _____ 3,4,5,13, Keyboard inputs.  
Row1-Row4, 14,15,16  
The IN5851N incorporates an innovative keyboard scheme that allows either the  
standard 2-of-7 keyboard with negative common or the inexpensive single contact  
(form A) keyboard to be used.  
Col1-Col4  
A valid key entry is defined by either a single row being connected to a single  
column or GND being simultaneously presented to both a single row and column.  
When in the on-hook mode, the row and column inputs are held high and no  
keyboard inputs are accepted.  
When off-hook, the keyboard is completely static until the initial valid key input is  
sensed. The oscillator is then enabled and the rows and columns are scanned  
alternately (pulled high, then low) to verify the varied input. The input must  
remain valid for 10msec of debounce time to be accepted.  
Form A type keyboard  
2 of 7 keyboard (negative common)  
2 of 7 keyboard  
Electronic input  
GND  
6
Negative supply  
2