W91820LN Datasheet PDF - Winbond
| Part Number | W91820LN | |
| Description | 13-MEMORY TONE/PULSE DIALER WITH HANDFREE/ LOCK AND HOLD FUNCTIONS | |
| Manufacturers | Winbond | |
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W91820N SERIES
13-MEMORY TONE/PULSE DIALER WITH
HANDFREE, LOCK AND HOLD FUNCTIONS
GENERAL DESCRIPTION
The W91820N is a series of tone/pulse switchable telephone dialers with 13 memory, keytone, hold,
lock, and handfree dialing control features. These chips are fabricated using Winbond's high-
performance CMOS technology and thus offer good performance in low-voltage, low-power
operations.
FEATURES
• Tone/pulse switchable dialer
• Two by 32 digits redial and save memory
• Three by 32 digits one-touch direct repertory memory
• Ten by 32 digits two-touch indirect repertory memory
• Pulse-to-tone (*/T) keypad for long distance call operation
• Chain dialing
• Uses 5 × 5 keyboard
• Easy operation with redial, flash, pause, and */T keypads
• Pause, P→T (pulse-to-tone) can be stored as a digit in memory
• Dialing rate:10 ppS or 20 ppS by mask option
• Minimum tone output duration: 93 mS (unless W91824N/AN is 87 mS)
• Minimum intertone pause: 93 mS (unless W91824N/AN is 87mS)
• Pause time: 3.6 sec. (unless W91824N/AN is 2.0 sec.)
• Flash break time (73 mS, 100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0 S
• Make/break ratio (2:3 or 1:2) selectable by MODE pin
• Mute key for speech network mute
• No key will be accepted except the "HOLD" key when in the Hold mode
• Key tone output for valid keypad entry recognition
• On-chip power-on reset
• Uses 3.579545 MHz crystal or ceramic resonator
• 20, or 22-pin dual-in-line plastic package
• The different dialers in the W91820N series are shown in the following table:
TYPE NO.
W91820N/824N
W91820AN/824AN
W91820LN
W91820ALN
W91822N
W91822AN
PULSE (ppS)
10
10
10
10
20
20
LOCK
-
-
√
√
-
-
KEY TONE
√
√
-
-
√
√
HANDFREE DIALING
-
√
-
√
-
√
PACKAGE (PINS)
20
22
20
22
20
22
Note: W91824N/824AN for French only.
Publication Release Date: May 1999
- 1 - Revision A2
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W91820N SERIES
Pin Description, continued
SYMBOL 20-PIN 22-PIN I/O
FUNCTION
HFI, HFO
- 11, 12 I, O Handfree control pins.
A low pulse on the HFI input pin toggles the handfree
control state. The status of the handfree control state is
listed in the following table:
CURRENT STATE
NEXT STATE
HOOK SW. HFO INPUT HFO DIALING
-
On Hook
Low HFI
High HFI
High
Low
Yes
No
Off Hook High HFI
Low Yes
On Hook
- Off Hook Low Yes
Off Hook Low On Hook Low
No
Off Hook High On Hook High Yes
The HFI pin is pulled to VDD by an internal resistor.
A detailed timing diagram is shown in Figure 3.
BLOCK DIAGRAM
HKS
HFI
XT XT
SYSTEM CLOCK
GENERATOR
ROW
(R1 ~ R4, Vx/R5)
COLUMN
(C1 ~ C4, Vss)
KEYBOARD
INTERFACE
DTMF
D/A
CONVERTER
READ/WRITE
COUNTER
CONTROL
LOGIC
LOCK
MODE
LOCATION
LATCH
RAM
PULSE
CONTROL
LOGIC
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
T/P MUTE
KT
DP
HFO
H/P MUTE
Publication Release Date: May 1999
- 5 - Revision A2
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for W91820LN electronic component. |
| Information | Total 22 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ W91820LN.PDF Datasheet ] | |
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