HC55140IMZ Intersil, HC55140IMZ Datasheet - Page 15

• Manufacturer Part Number: HC55140IMZ
• Description: IC SLIC UNIVERSAL LP 28-PLCC
• Manufacturer: Intersil
• Series: UniSLIC14r

Specifications of HC55140IMZ

• Function: Subscriber Line Interface Concept (SLIC)
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 2.25mA
• Power (watts): 1.5W
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Includes: Battery Tracking Anti-Clipping, Loop and Ground Key Detection, Ring Control
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -

†
On Hook Overhead Voltage
times the Switch Hook Detect threshold (I
maximum loop current for a constant on hook overhead
voltage is defined as ISH-.
The on hook overhead voltage, required for a given signal
level at the load, must take into account the AC voltage drop
across the 2 external protection resistors (R
internal sense resistors (R
on hook overload voltage is calculated using Equation 1.
where
V
V
R
R
Z
1.5V = Additional on hook overhead voltage requirement
V
Internal overhead voltage automatically generated by the SLIC.
L
OH(on) at Load
sp(on)
P
S
OH on
ISH- = I
= AC load impedance for (600Ω)
= Protection Resistors (Typically 30Ω)
= Internal Sense Resistors (40Ω)
V
(
OH(on)
V
) at Load
SHD
= Required on hook transmission for speech
BH
DC FEED CURVE
(0.6)
ISH-
LOOP CURRENT
2.5V
VBH
2.5V
HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
=
ON HOOK
OVERHEAD
= On hook overhead voltage at load
†
I
SHD
V
sp on
(
)
×
S
⎛
⎜
⎝
VOH(on) AT LOAD
) as shown in Figure 16. The AC
1
15
+
The on hook overhead
voltage at the load (V
at Load) is independent of the
V
set, the on hook voltage
remains constant as the V
battery voltage changes. The
on hook voltage also remains
constant over temperature
and line leakages up to 0.6
SLIC SELF PROGRAMMING
2R
----------------------------- -
BH
P
battery voltage. Once
Z
+
L
2R
ISH-
S
⎞
⎟
⎠
SHD
+
P
1.5V
) and the 2
FIGURE 15. UniSLIC14 DC FEED CURVE
). The
I
SHD
IOH
OH
(on)
(EQ. 1
BH
R
SAT
ILOOP(min)
LOOP CURRENT (mA)
To account for any process and temperature variations in the
performance of the SLIC, 1.5V is added to the overhead
voltage requirement for the on hook case in Equation 1 and
2.0V for the off hook case in Equation 3. Note the 2.5V
overhead is automatically generated in the SLIC and is not
part of the external overhead programming.
FIGURE 16. OVERHEAD VOLTAGE OF THE TIP AND RING
V
ZL
(LOAD)
VOH(off) AT LOAD
EXTERNAL PROTECTION
RESISTOR
Z
L
AMPLIFIERS
2R
P
V
Where:
V
transmission delivered to the load.
ZL
OH ON OFF
is the required on hook or offhook
(
2R
INTERNAL SENSE
RESISTORS
,
S
)
REQUIRED
OVERHEAD VOLTAGE
V
=
ILOOP(max)
OH
⎛
⎜
⎝
2R
----------------------------- -
(ON, OFF)
UniSLIC14
P
Z
CONSTANT
CURRENT
REGION
+
L
60kΩ SLOPE
2R
TIP AND RING
AMPLIFIERS
S
⎞
⎟
⎠
V
June 1, 2006
ZL
FN4659.13