MT8889CS Mitel, MT8889CS Datasheet
MT8889CS
Manufacturer Part Number
MT8889CS
Description
SOP20
Manufacturer
Mitel
Specifications of MT8889CS
Date_code
10+
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Features
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Applications
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Description
The MT8889C is a monolithic DTMF transceiver with
call progress filter.
technology offering low power consumption and high
reliability.
TONE
OSC1
OSC2
IN+
GS
Central office quality DTMF transmitter/
receiver
Low power consumption
High speed adaptive micro interface
Adjustable guard time
Automatic tone burst mode
Call progress tone detection to -30dBm
Credit card systems
Paging systems
Repeater systems/mobile radio
Interconnect dialers
Personal computers
IN-
V
+
-
DD
Oscillator
Circuit
Circuit
V
Bias
Tone Burst
Gating Cct.
Ref
Tone
Filter
Dial
V
SS
It is fabricated in CMOS
Converters
High Group
Low Group
D/A
Control
Filter
Filter
Control
Logic
Logic
Figure 1 - Functional Block Diagram
ESt
Row and
Counters
Column
Converter
and Code
Algorithm
Digital
Steering
Logic
St/GT
The receiver section is based upon the industry
standard
transmitter
converter for low distortion, high accuracy DTMF
signalling. Internal counters provide a burst mode
such that tone bursts can be transmitted with precise
timing. A call progress filter can be selected allowing
a microprocessor to analyze call progress tones.
The MT8889C utilizes an adaptive micro interface,
which allows the device to be connected to a number
of popular microcontrollers with minimal external
logic. The MT8889C-1 is functionally identical to the
MT8889C except the receiver is enhanced to accept
lower level signals, and also has a specified low
signal rejection level.
Transmit Data
Receive Data
Register
Register
Register
Register
Status
Control
Register
MT8889CE/CE-1
MT8889CC/CC-1
MT8889CS/CS-1
MT8889CN/CN-1
Control
A
with Adaptive Micro Interface
B
Integrated DTMF Transceiver
MT8870
utilizes
MT8889C/MT8889C-1
Ordering Information
-40°C to +85°C
DTMF
a
ISSUE 2
switched
Buffer
Control
Data
Interrupt
Bus
20 Pin Plastic DIP
20 Pin Ceramic DIP
20 Pin SOIC
24 Pin SSOP
Logic
I/O
receiver
capacitor
while
D0
D1
D2
D3
IRQ/CP
DS/RD
CS
R/W/WR
RS0
May 1995
4-107
D/A
the
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