Advance Data Sheet
March 1997
L8575
Dual-Resistive, Low-Cost SLIC
Lucent Technologies Inc.
23
Electrical Characteristics
(continued)
Serial Data Interface
(continued)
Table 14. Input DATA Bit Definition
12-3306(F).br3
Figure 8. Logic Diagram (Positive Logic; Flip-Flops Clocked on High-to-Low Transition)
Input
RZA
FLTA
RTA
LCA
RZB
FLTB
RTB
LCB
DATA Bit
D0A
D1A
D2A
D3A
D0B
D1B
D2B
D3B
Input Bit Definition
Channel A ringing voltage zero crossing detector output (positive = 1).
Channel A fault detector output (loop fault = 1).
Channel A ring-trip detector output (ring-trip = 1).
Channel A switchhook detector output (off-hook = 1).
Channel B ringing voltage zero crossing detector output (positive = 1).
Channel B fault detector output (loop fault = 1).
Channel B ring-trip detector output (ring-trip = 1).
Channel B switchhook detector output (off-hook = 1).
RZA
D0
D1
SEL
Q
D
Q
Q
D0A
D0A
DI
CLK
EN
FLTA
D0
D1
SEL
Q
D
Q
Q
D1A
D1A
RTA
D0
D1
SEL
Q
D
Q
Q
D2A
RDRA
LCA
D0
D1
SEL
Q
D
Q
Q
D3A
RDTA
RZB
D0
D1
SEL
Q
D
Q
Q
D0B
D0B
FLTB
D0
D1
SEL
Q
D
Q
Q
D1B
D1B
RTB
D0
D1
SEL
Q
D
Q
Q
D2B
RDRB
LCB
D0
D1
SEL
Q
D
Q
Q
D3B
RDTB
DO
RELAY
DRIVER
RELAY
DRIVER
RELAY
DRIVER
RELAY
DRIVER
RELAY
DRIVER
RDDB
RELAY
DRIVER
RDDA
FROM
INTERNAL
RING VOLTAGE
ZERO DETECT
CIRCUIT
FROM
INTERNAL
FAULT DETECT
CIRCUIT
FROM
INTERNAL
RING-TRIP
CIRCUIT
FROM
INTERNAL
LOOP CLOSURE
CIRCUIT
8-bit SHIFT
RESISTOR
DATA
LATCHES
TO INTERNAL STATE CONTROL
COMBINATIONAL LOGIC CIRCUITRY
INDICATES EXTERNAL PACKAGE MODE