U3761MB-T ATMEL [ATMEL Corporation], U3761MB-T Datasheet - Page 10

• Manufacturer Part Number: U3761MB-T
• Description: Universal Telephone IC - All Functions Integrated
• Manufacturer: ATMEL [ATMEL Corporation]

Pin Description
10
Pin
38
39
40
41
42
43
44
U3761MB-T
Symbol Function
MODE
Mask
DP
R1
R2
R3
R4
Pulling MODE pin to:
C3: tone mode with 87 ms burst time and 140 ms pause
C4: tone mode with 87 ms DTMF burst and 87 ms pause
R1: pulse mode with 20 pps, Make/Break = 40/60
R2: pulse mode with 20 pps, Make/Break = 33/66
R3: pulse mode with 10 pps, Make/Break = 40/60
R4: pulse mode with 10 pps, Make/Break = 33/66
C1: pulse mode with 10 pps, Make/Break = 33/66 and temp.
MODE pin pulled to R4: with temporary DTMF, 87 ms DTMF
burst and 87 ms pause
Pulse dialing output. Flash key will cause DP to be active in
either DTMF mode or pulse mode.
In on-hook state is DP = VDD
Short mute during pulse dialing, active high
During MASK an internal NPN transistor shortens VL
against VI.
Keyboard input
DTMF with 87 ms DTMF burst, 140 ms pause
MODE
R2-R4
MASK
DP
R1
VDD
VDD
Configuration
VDD
PD
PD
PD
VDD
VDD
VDD
VDD
VDD
PD
PD
4744A–CORD–09/03