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參數資料
| 型號： | W91F820LN |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS |
| 中文描述： | TELEPHONE DIALER CKT, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁數： | 3/20頁 |
| 文件大小： | 231K |
| 代理商： | W91F820LN |
Preliminary W91F820N SERIES
Publication Release Date: January 1999
- 3 -
Revision A1
PIN DESCRIPTION
SYMBOL
Column-
Row Inputs
20-PIN
1
4
&
17
20
22-PIN
1
4
&
19
22
I/O
I
FUNCTION
The keyboard input is compatible with a standard 5
×
5
keyboard, an inexpensive single contact (Form A) keyboard,
and electronic input.
In normal operation, any single button can be pushed to
produce dual tone, pulses, or functions. Activation of two or
more buttons will result in no response except for a single
tone.
A built-in inverter together with an inexpensive 3.579545 MHz
crystal supplies the oscillator. The oscillator stops when there
is no keypad input. The crystal frequency deviation is 0.02%.
Crystal oscillator output pin.
XT
8
8
I
XT
9
10
9
O
O
T/P MUTE
10
The T/P MUTE is a conventional CMOS N-channel open
drain output.
The output transistor turns on with a low level during a dialing
sequence (both pulse and tone mode). Otherwise, it is off.
No connect
Connecting the mode pin to V
SS
places the dialer in tone mode.
Connecting the mode pin to V
DD
places the dialer in pulse
mode with an M/B ratio of 40:60.
Leaving the mode pin floating places the dialer in pulse mode
with an M/B ratio of 33.3:66.7.
The HKS (hook switch) input is used to sense whether the
handset is on-hook or off-hook.
In on-hook state, HKS = 1: chip is in sleeping mode, no operation.
In off-hook state, HKS = 0: chip is enabled for normal operation.
HKS pin is pulled to V
DD
by internal resistor.
The key tone output is a conventional CMOS inverter. The
key tone is generated when any valid key is pressed; the KT
pin generates a 1.2 KHz square wave at 35 mS. When no key
is pressed, the KT pin remains in low state.
The function of this terminal is to prevent "0" dialing and "9"
dialing under PABX system long distance call control. When
the first key input after reset is 0 or 9, all key inputs, including
the 0 or 9 key, become invalid and the chip generates no
output. The telephone is reinitialized by a reset.
The function of the LOCK pin is shown below:
N.C.
MODE
16
14
18
16
-
I
HKS
11
13
I
KT
(W91F820N/
F820AN/
F822N)
5
5
O
LOCK
(W91F820LN/
820ALN only)
5
5
I
LOCK PIN
V
DD
Floating
FUNCTION
V
SS
"0", "9" dialing inhibited
Normal dialing Mode
"0" dialing inhibited
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| W91F822N | 13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS |
| W91F840N | 23-Flash Memory Tone/Pulse Dialer With Handfree,Hold And Lock Functions(具有23個閃速存儲器、免提、保持和上鎖功能的音頻/脈沖撥號器) |
| W91F841ALN | 23-Flash Memory Tone/Pulse Dialer With Handfree,Hold And Lock Functions(具有23個閃速存儲器、免提、保持和上鎖功能的音頻/脈沖撥號器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W91F820N | 制造商:WINBOND 制造商全稱:Winbond 功能描述:13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS |
| W91F820NSERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:13-FLASH MEMORY TON/PULSE DIALER WITH HANDFREE. LOCK AND HOLD FUNCTIONS |
| W91F822AN | 制造商:WINBOND 制造商全稱:Winbond 功能描述:13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS |
| W91F822N | 制造商:WINBOND 制造商全稱:Winbond 功能描述:13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS |
| W91F840ALN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
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