LE79555-4BVC Zarlink, LE79555-4BVC Datasheet - Page 11

• Manufacturer Part Number: LE79555-4BVC
• Description: SLIC 1-CH 63dB 120mA 5V 44-Pin TQFP Tray
• Manufacturer: Zarlink

Specifications of LE79555-4BVC

• Package: 44TQFP
• Number Of Channels Per Chip: 1
• Polarity Reversal: Yes
• Longitudinal Balanced: 63(Min) dB
• Loop Current: 120 mA
• Minimum Operating Supply Voltage: 4.75 V
• Typical Operating Supply Voltage: 5 V
• Typical Supply Current: 6 mA

Loop Detector
Relay Driver Output
(RINGOUT, RYOUT1, RYOUT2)
1.
2.
3.
4.
5.
6.
7.
8.
a) Overload level is defined as THD = 1%.
b) Overload level is defined as THD = 1.5%.
Unless otherwise noted, R
Balance return signal is the signal generated at V
the programmed impedance.
Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.
This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
Tested with 0 Ω source impedance. 2 MΩ is specified for system design only.
Group delay can be greatly reduced by using a Z
than 2 µs and increases 2WRL. The effect of group delay on line card performance also may be compensated for by synthesizing complex
impedance with the QLSLAC™ device.
Minimum current level guaranteed not to cause a false loop detect.
Off-hook threshold
On-hook threshold
Hysteresis
IGK, Ground-key detector threshold
On voltage
Off leakage
Zener breakover
Zener On voltage
Description
Description
L
= 600 Ω. Also, refer to the Le79555 device test circuit in
BGND
R
R
R
R
Active, Standby, and Tip open
I
V
I
I
OL
Z
Z
Figure 1. Relay Driver Schematic
OH
D
D
D
L
= 100 µA
= 30 mA
from BX to GND
= 35.4 kΩ
= 35.4 kΩ
= 35.4 kΩ
= 40 mA
T
Test Conditions (See Note 1)
Test Conditions (See Note 1)
TX
= +5 V
network such as that shown in
by V
Zarlink Semiconductor Inc.
RX
. This specification assumes that the two-wire, AC-load impedance matches
11
RYOUT1, RYOUT2
RINGOUT,
Figure
Figure 9, on page
7. The network reduces the group delay to less
Min
Min
9.4
8.8
5
6
11.7
10.4
Typ
Typ
+0.3
1.3
7.2
9
8
16.
Max
14.0
12.0
Max
+0.7
100
13
Unit
Unit
mA
µA
V
V
Note
Note