MT8889CS1 Zarlink, MT8889CS1 Datasheet - Page 2

• Manufacturer Part Number: MT8889CS1
• Description: DTMF TXRX 3.579MHz CMOS 5V 20-Pin SOIC Tube
• Manufacturer: Zarlink

Specifications of MT8889CS1

• Package: 20SOIC
• Operating Frequency: 3.579 MHz
• Typical Supply Current: 7 mA
• Typical Operating Supply Voltage: 5 V
• Minimum Operating Supply Voltage: 4.75 V
• Maximum Operating Supply Voltage: 5.25 V

Functional Description
The MT8889C Integrated DTMF Transceiver consists of a high performance DTMF receiver with an internal gain
setting amplifier and a DTMF generator, which employs a burst counter to synthesize precise tone bursts and
pauses. A call progress mode can be selected so that frequencies within the specified passband can be detected.
The adaptive micro interface allows microcontrollers, such as the 68HC11, 80C51 and TMS370C50, to access the
MT8889C internal registers.
Pin Description
R/W/WR
20
10
12
11
1
2
3
4
5
6
7
8
9
OSC1
OSC2
TONE
VRef
VSS
IN+
GS
IN-
CS
20 PIN PLASTIC DIP/SOIC
Pin #
24
10
11
12
13
14
1
2
3
4
5
6
7
10
1
2
3
4
5
6
7
8
9
28
12
13
14
15
17
1
2
4
6
7
8
9
20
19
18
17
16
15
14
13
12
11
R/W (WR) (Motorola) Read/Write or (Intel) Write microprocessor input. TTL compatible.
DS (RD) (Motorola) Data Strobe or (Intel) Read microprocessor input. Activity on this
Name
OSC1
OSC2
TONE
V
RS0
V
IN+
GS
VDD
St/GT
ESt
D3
D2
D1
D0
IRQ/CP
DS/RD
RS0
IN-
CS
Ref
SS
Non-inverting op-amp input.
Inverting op-amp input.
Gain Select. Gives access to output of front end differential amplifier for
connection of feedback resistor.
Reference Voltage output (V
Ground (0V).
DTMF clock/oscillator input. Connect a 4.7 M
is used.
Oscillator output. A 3.579545 MHz crystal connected between OSC1 and OSC2
completes the internal oscillator circuit. Leave open circuit when OSC1 is driven
externally.
Output from internal DTMF transmitter.
Chip Select input. This signal must be qualified externally by either address
strobe (AS), valid memory address (VMA) or address latch enable (ALE) signal,
see Figure 14.
Register Select input. Refer to Table 3 for bit interpretation. TTL compatible.
input is only required when the device is being accessed. TTL compatible.
R/W/WR
OSC1
OSC2
TONE
VRef
VSS
IN+
GS
NC
NC
IN-
CS
Figure 2 - Pin Connections
Zarlink Semiconductor Inc.
10
11
12
1
2
3
4
5
6
7
8
9
24 PIN SSOP
MT8889C
2
24
23
22
21
20
19
18
17
16
15
14
13
DD
VDD
St/GT
ESt
D3
D2
D1
D0
NC
NC
IRQ/CP
DS/RD
RS0
/2).
Description
Ω
OSC1
OSC2
VRef
VSS
resistor to VSS if crystal oscillator
NC
NC
NC
5
6
7
8
9
10
11
28 PIN PLCC
•
Data Sheet
25
24
23
22
21
20
19
NC
NC
NC
D3
D2
D1
D0