U3761MB-T ATMEL [ATMEL Corporation], U3761MB-T Datasheet - Page 9

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

Pin Description
4744A–CORD–09/03
Pin
32
33
34
35
36
37
Symbol Function
OUT
VDD
HKS
Test
NC
KT
Buzzer output
Test input with 6.25 kW pull-up resistor
Supply output for dialer part
Not connected
Hook switch input
HKS = 0: On-hook state. Chip in sleep mode, no operation
(external pull-down resistor recommended)
HKS = 1: Off-hook state. Chip enable for normal operation
I
Keytone output signal which is sent out in pulse dialing
mode with a keytone frequency of 582 Hz.
KT sink/drive current is about 100 µA at V
HKS
£ 0.5 mA
DD
= 2.5 V
TEST
HKS
VRING
VDD
KT
OUT
PD
PD
PD
Configuration
VDD
VDD
6 V
30 V
50 V
PD
VDD
PD
PD
U3761MB-T
VDD
6.5K
6 V
VDD
VDD
200
VL
9