參數(shù)資料
型號(hào)： ATTL7583BAJ-D
廠商： LEGERITY INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PDSO28
封裝： PLASTIC, SOG-28
文件頁(yè)數(shù)： 5/21頁(yè)
文件大小： 398K
代理商： ATTL7583BAJ-D
13
Data Sheet
February 2001
L7583A/B/C/D Line Card Access Switch
Protection (continued)
Integrated SLIC Protection (continued)
External Secondary Protector
With the above integrated protection features, only one over-
voltage secondary protection device on the loop side of the
L7583 is required. The purpose of this device is to limit fault
voltages seen by the L7583 so as not to exceed the break-
down voltage or input-output isolation rating of the device.
To minimize stress on the L7583, use of a foldback- or crow-
bar-type device is recommended. A detailed explanation and
design equations on the choice of the external secondary pro-
tection device are given in the An Introduction to L758X
Series of Line Card Access Switches Application Note. Basic
design equations governing the choice of external secondary
protector are given below.
I
|VBATmax| + |Vbreakovermax| < |Vbreakdownmin(break)|
I
|Vringingpeakmax
| + |VBATmax| + |Vbreakovermax| < |Vbreak-
downmin(ring)
|
I
|Vringingpeakmax| + |VBATmax| < |Vbreakovermin|
where:
VBATmax—Maximum magnitude of battery voltage.
Vbreakovermax—Maximum magnitude breakover voltage of
external secondary protector.
Vbreakovermin—Minimum magnitude breakover voltage of
external secondary protector.
Vbreakdownmin(break)—Minimum magnitude breakdown volt-
age of L7583 break switch.
Vbreakdownmin(ring)—Minimum magnitude breakdown volt-
age of L7583 ring access switch.
Vringingpeakmax—Maximum magnitude peak voltage of ring-
ing signal.
Series current-limiting fused resistors or PTCs should be
chosen so as not to exceed the current rating of the external
secondary protector. Refer to the manufacturer’s data sheet
for requirements.
Table 15. Electrical Specifications, Protection Circuitry
* Previous versions of this data sheet specified a Trigger Current of 50 mA minimum. Trigger Current is defined as the minimum current drawn from tip and
ring to turn on the SCR. The specification in this data sheet is Gate Trigger Current, which is defined as the maximum current that can flow into the battery
before the SCR turns on.
Typical at 25 °C.
Twice ± dynamic current limit of break switches.
§ In some instances, the typical ON-state voltage can range as low as –25 V.
Parameters Related to Diodes (in Diode Bridge)
Parameter
Test Condition
Measure
Min
Typ
Max
Unit
Voltage Drop @ Continuous Current
(50 Hz/60 Hz)
Apply ±dc current limit
of break switches
Forward
Voltage
——
3
V
Voltage Drop @ Surge
Current
Apply ±dynamic cur-
rent limit of break
switches
Forward
Voltage
—5
—
V
Parameters Related to Protection SCR
Surge Current
—
A
Gate Trigger Current*
——
—
25
50
mA
Gate Trigger Current Temperature
Coefficient
——
—
–0.5
—
%/°C
Hold Current
—
70
—
mA
Gate Trigger Voltage
Trigger current
—
VBAT – 4
—
VBAT – 2
V
Reverse Leakage Current
VBAT
——
—
1.0
A
ON-State Voltage§
0.5 A, t = 0.5 s
2.0 A, t = 0.5 s
VON
—
–3
–5
—
V
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