U3761MB-T Datasheet, PDF (4/27 Pages) ATMEL Corporation – Universal Telephone IC - All Functions Integrated

Pin Description
Pin Symbol Function
1
C1
2
C2
3
C3
Keyboard input
4
C4
C1
C2-C4
Configuration
VDD
VDD
PD
VDD
VDD
PD = Protection Device
5
Earth Earth key (604 ms high pulse, 1 s pause)
EARTH
VDD
PD
Toggle flipflop input
6
HFI Input with 200 kW pull-down resistor
HFI triggers HFO with each LOW/HIGH edge
VDD
HFI
VDD
PD
7
HFO Output will be toggled by each LOW/HIGH edge at HFI
HFO
VDD
PD
4 U3761MB-T
4744A–CORD–09/03