MT3170B/71B, MT3270B/71B, MT3370B/71B
F
LOW
F
HIGH
DIGIT
b
3
b
2
b
1
b
0
Data Sheet
852
852
941
941
941
697
770
852
941
1336
1477
1336
1209
1477
1633
1633
1633
1633
8
9
0
*
#
A
B
C
D
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
0= LOGIC LOW, 1= LOGIC HIGH
Table 1 - Serial Decode Bit Table
Note:
b0=LSB of decoded DTMF digit and shifted out first.
Powerdown Mode (MT317xB/337xB)
The MT317xB/337xB devices offer a powerdown function to preserve power consumption when the device is not in
use. A logic high can be applied at the PWDN pin to place the device in powerdown mode. The ACK pin should be
kept at logic low to avoid undefined ESt/DStD and SD outputs (see Table 2).
ACK (input)
low
low
high
high
+
PWDN (input)
low
high
+
low
high
ESt/DStD (output)
Refer to Fig. 4 for
timing waveforms
low
low
undefined
Table 2 - Powerdown Mode
SD (output)
Refer to Fig. 4 for
timing waveforms
low
undefined
undefined
MT317xB/337xB
status
normal operation
powerdown mode
undefined
undefined
=enters powerdown mode on the rising edge.
Frequency 1 (Hz)
350
425
400
480
440
480
440
480
Frequency 2 (Hz)
440
---
---
620
---
620
480
620
On/Off
continuous
continuous
continuous
0.5s/0.5s
0.5s/0.5s
0.25s/0.25s
2.0s/4.0s
0.25s/0.25s
Description
North American Dial Tones
European Dial Tones
Far East Dial Tones
North American Line Busy
Japanese Line Busy
North American Reorder Tones
North American Audible Ringing
North American Reorder Tones
Table 3 - Call Progress Tones
5
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
