IDT821621J IDT, Integrated Device Technology Inc, IDT821621J Datasheet - Page 8

• Manufacturer Part Number: IDT821621J
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT821621J

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: No
• On-chip Ring Relay Driver: Yes
• Operating Supply Voltage (typ): 3.3/5V
• Operating Temp Range: -40C to 85C
• Package Type: PLCC
• Operating Temperature Classification: Industrial
• Pin Count: 32
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Table 1 — Pin Description
PIN DESCRIPTION
IDT821621
Pin Description
RINGOUT
Pin Name
B (RING)
RYOUT1
RYOUT2
RYOUT3
VBREF
A (TIP)
AGND
BGND
VBAT
VCC
RSN
RDC
TMG
HPA
HPB
VTX
DET
CAS
DA
DB
RD
NC
C1
C2
D1
D2
D3
Capacitor
Capacitor
Capacitor
Ground
Ground
Battery
Output
Output
Output
Output
Output
Output
Power
Inputs
Inputs
Type
Input
Input
Input
I/O
I/O
−
−
−
−
−
11, 12, 18, 19, 25
Pin No.
PLCC
21
31
32
27
22
24
13
17
23
26
29
30
16
15
10
14
28
20
1
8
2
9
4
5
6
3
7
Analog ground.
Battery ground.
Battery supply and connection to substrate.
Battery reference pin. It should be connected to VBAT.
+3.3 V / +5 V compatible power supply.
Connection to the Tip wire of the subscriber loop.
Connection to the Ring wire of the subscriber loop.
A (TIP) side of high-pass filter capacitor.
B (RING) side of high-pass filter capacitor.
Negative input to ring-trip comparator.
Positive input to ring-trip comparator.
Receive summing node.
Transmit output.
SLIC state control. TTL compatible. C2 is MSB and C1 is LSB. Refer to
Relay driver control. TTL compatible.
D1, D2 and D3 control the relay drivers RYOUT1, RYOUT2 and RYOUT3 respectively. Logic low on D1
activates the RYOUT1 relay driver. Logic low on D2 activates the RYOUT2 relay driver. Logic low on D3
activates the RYOUT3 relay driver.
Relay/switch driver. Open-collector driver with emitter internally connected to BGND.
Relay/switch driver. Open-collector driver with emitter internally connected to BGND.
Relay/switch driver. Open-collector driver with emitter internally connected to BGND.
Ringing relay driver. Open-collector driver with emitter internally connected to BGND.
Detector output. Open-collector with a built-in 15 kΩ pull-up resistor.
This output provides on-hook/off-hook status of the loop based on the selected operating state. Refer to
Table 2
switch event or ring-trip event has been detected.
Detect resistor. An external resistor connected to this pin is used to set the loop-detect threshold.
DC feed resistor. The DC feed current is programmed by a network connected between this pin and RSN.
Anti-saturation capacitor. An external capacitor is connected to this pin to filter battery voltage when
operating in anti-saturation region.
Thermal management. An external resistor is connected between this pin and VBAT to offload power from
SLIC.
No Connect.
for details. The detected output will either be hook switch or ring-trip. Logic low indicates that a hook
6
Description
Table 2
for details.
LONG HAUL SLIC
October 8, 2003