L9214A/G
Low-Cost Ringing SLIC
Preliminary Data Sheet
October 2001
■ Overhead voltage:
— Automatically adjusted in active mode
Features
— Clamped <56.5 V in scan and on-hook modes
■ Onboard balanced trapezoidal ringing generation,
40 Vrms, 1.2 crest factor:
■ Thermal shutdown protection with hysteresis
— 3 REN ring load (2330 Ω + 24 µF), 600 Ω loop
— 2 REN ring load (3500 Ω + 16 µF), 1000 Ω loop
— 2 REN ring load (3500 Ω + 1.8 µF), 500 Ω loop
— No ring relay
■ Longitudinal balance:
— ETSI/ITU-T balance
— GR-909
— No bulk ring generator required
— 15 Hz to 70 Hz ring frequency supported
■ Meter pulse compatible
■ ac interface:
■ Power supplies requirements:
— VCC talk battery and ringing battery required
— No –5 V supply required
— Two SLIC gain options to minimize external com-
ponents required for interface to first- or third-gen-
eration codecs
— Sufficient dynamic range for direct coupling to
codec output
— No high-voltage positive supply required
■ Flexible Vcc options:
— 3.3 V or 5 V VCC operation
— 3.3 V or 5 V VCC interchangeable and transparent
to users
■ 28-pin SOG, 32-pin PLCC, and 48-pin MLCC pack-
age options
■ 90 V CBIC-S technology
■ Power control options:
— Automatic battery switch
— Power control resistor
Description
■ Minimal external components required
The L9214 is designed to provide battery feed, ringing,
and supervision functions on short and medium plain
old telephone service (POTS) loops. Supported round-
trip loop length is up to 1000 Ω of wiring resistance plus
handset or ringing load. This device is designed to min-
imize power in all operating states.
■ Ten operating states:
— Forward active, fast polarity reversal
— Reverse active, fast polarity reversal
— Forward active, slow polarity reversal
— Reverse active, slow polarity reversal
— Scan
The L9214 offers eight operating states. The device
assumes use of a lower-voltage talk battery, a higher-
voltage ringing battery and a single VCC supply.
— Disconnect
— Ringing, line forward with high slope
— Ringing, line reverse with high slope
— Ringing, line forward with low slope
— Ringing, line reverse with low slope
The L9214 requires only a positive VCC supply. No
–5 V supply is needed. The L9214 can operate with a
VCC of either 5.0 V or 3.3 V, allowing for greater user
flexibility. The choice of VCC voltage is transparent to
the user; the device will function with either supply volt-
age connected.
■ Unlatched parallel data control interface
■ Low SLIC power:
— Scan 24 mW (VCC = 5.0 V)
— Forward/reverse active 148 mW (VCC = 5.0 V)
— Scan 17 mW (VCC = 3.3 V)
Two batteries may be used:
— Forward/reverse on-hook 135 mW (VCC = 3.3 V)
1. A high-voltage ring battery (VBAT1). VBAT1 is a maxi-
mum –70 V and is used for power ringing, scan, and
on-hook transmission modes. This supply is current
limited to the maximum power ringing current of
approximately 90 mApeak.
■ Supervision:
— Loop start, fixed threshold with hysteresis
— Ring trip filtering, fixed threshold not a function of
battery voltage, user adjustable with an external
resistor
— Common-mode current for ground key applica-
tions, user-adjustable threshold
2. A lower-voltage talk battery (VBAT2). VBAT2 is nor-
mally used for active mode powering.
Alternatively, operation may be from a single high-volt-
age battery supply with a power control resistor to
reduce the power dissipation in the SLIC.
■ Adjustable current limit:
— 10 mA to 45 mA programming range at 5 V Vcc
— 10 mA to 35 mA programming range at 3.3 V Vcc
4
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
