ISL5571A_04 Datasheet, PDF (6/12 Pages) Intersil Corporation – Access High Voltage Switch

ISL5571A
TABLE 8. PIN DESCRIPTIONS - ISL5571A
PIN
PIN
NO. NAME
DESCRIPTION
PIN
PIN
NO. NAME
DESCRIPTION
1
F_GND Fault Ground. Internally, this pin is electrically isolated
16
V_BAT Battery Voltage. Used as a reference for
from D_GND.
protection circuit. Provides Trigger
current for the protection SCR.
2
T_BAT Connect to TIP on SLIC side.
3
T_LINE Connect to TIP on line or phone side.
4
NC
No Connection.
15
R_BAT Connect to RING on SLIC side.
14
R_LINE Connect to RING on line or phone side.
13
NC
No Connection.
5
NC
No Connection.
6
T_RING Connect to Return Ground for Ringing Generator.
12
R_RING Connect to ringing generator.
11
LATCH Logic State Latch Control, active-high,
transparent low.
7
V_DD +5V supply.
10
INPUT Logic Level Input Switch Control.
8
T_SD
Temperature Shutdown Pin. Can be used as a logic level 9
D_GND Digital Ground. Internally, this pin is
input or output. See Truth Table. As an output, will read
electrically isolated from F_GND.
+5V when device is in its operational mode and 0V in the
thermal shutdown mode. In the ISL5571A, the thermal
shutdown mechanism cannot be disabled.
Pinout
ISL5571A
TOP VIEW
- 48 V_DC
TIP
RING
T_RING
6
RING
R1
T_LINE
RETURN
SW3
3
TIP LINE BREAK
SW1
D1
EXTERNAL
CROWBAR
PROTECTION †
D2
14
R2
R_LINE
RING ^RING
ACCESS
LINE BREAK
SW2
SW4
12
R_RING
† TLINE EXTERNAL PROTECTOR MAXIMUM
VOLTAGE PRIOR TO SWITCHING TO THE
ON STATE SHOULD NOT EXCEED 130V.
† ^{RLINE EXTERNAL PROTECTOR MAXIMUM}
VOLTAGE PRIOR TO SWITCHING TO
THE ON STATE SHOULD NOT EXCEED 220V.
R_GEN
RING
GENERATOR
BATTERY
11
LATCH
V_BAT
16
D3
SCR
T_BAT
TIP
2
F_GND
1
D4
R_BAT
RING
15
CONTROL LOGIC
10
9
8
7
V_DD
INPUT
D_GND
TSD
+ 5 V_DC
V_BAT
SLIC
GND
RRLY
FIGURE 1. APPLICATION CIRCUIT
6