mt88l85anr1 Zarlink Semiconductor, mt88l85anr1 Datasheet - Page 2

• Manufacturer Part Number: mt88l85anr1
• Description: 3 V Integrated Dtmf Transceiver With Power-down And Adaptive Micro Interface
• Manufacturer: Zarlink Semiconductor

The MT88L85 utilizes an adaptive micro interface, which allows the device to be connected to a number of popular
microcontrollers with minimal external logic. The MT88L85 provides enhanced power-down features. The
transmitter and receiver may independently be powered down via register control.
24
10
12
13
14
11
1
2
3
4
5
6
7
Pin #
R/W/WR
28
12
13
14
15
17
1
2
4
6
7
8
9
OSC1
OSC2
TONE
VRef
VSS
IN+
GS
NC
NC
CS
IN-
DS (RD) (Motorola) Data Strobe or (Intel) Read microprocessor input. Activity on this input is only
R/W(W
Name
OSC1
OSC2
TONE
RS0
V
V
GS
CS
IN+
IN-
R)
Ref
SS
24 PIN DIP/SSOP
10
11
12
1
2
3
4
5
6
7
8
9
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).
Oscillator input. This pin can also be driven directly by an external clock. CMOS
compatible.
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. High impedance when TOUT bit in Control
Register
(Motorola) Read/Write or (Intel) Write microprocessor input. CMOS compatible.
Chip Select input must be gated externally by either address strobe (AS), valid memory
address (VMA) or address latch enable (ALE) signal, depending on processor used. See
Figure 12. Must not be tied low. CMOS compatible.
Register Select input. Refer to Table 3 for bit interpretation. CMOS compatible.
required when the device is being accessed. CMOS compatible.
A (CRA) is set to low. Requires resistive termination to Vss.
24
23
22
21
20
19
18
17
16
15
14
13
VDD
St/GT
ESt
D3
D2
D1
D0
NC
PWDN
IRQ/CP
DS/RD
RS0
Figure 2 - Pin Connections
Zarlink Semiconductor Inc.
MT88L85
DD
/2).
2
OSC1
OSC2
VRef
VSS
Description
NC
NC
NC
5
6
7
8
9
10
11
28 PIN PLCC
•
25
24
23
22
21
20
19
NC
D3
D2
D1
D0
NC
PWDN
Data Sheet