M-959 Datasheet, PDF (3/5 Pages) Clare, Inc. – Dial Pulse Counter and Hook Status Monitor

M-959
Pin Functions
Pin
LC
OH
10/20
D3-D0
OE
XIN
XOUT
Clear
Strobe
Function
Loop Current Input. Signal from phone line to be monitored for dial pulse signaling and hook status. Active low,
internally pulled high.
Off-hook Output. Hook status of phone line. Active (off-hook) high.
Pulse Speed Input. Low for 10 pulse per second, high for 20 pulse per second. Internally pulled low.
Data Outputs. Binary decoded rotary dialed digit. Active during valid digit time (strobe high), low at any other time.
Digit Dialed D3
D2
D1 D0
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
0
1
0
1
0
Output Enable Input. Active high, a log low tri-states D3 through D0 outputs. Internally pulled high.
Crystal Oscillator Input
Crystal Oscillator Output.
Strobe Control Input. Momentary high during digit valid time resets STROBE latch output low until next valid
digit is received. Internally pulled low.
Digit Valid Output. Indicates valid digit data present on D3 through D0. Active high.
Timing Diagram
Rev. 3
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