MC145574AAC Freescale Semiconductor, MC145574AAC Datasheet - Page 148

• Manufacturer Part Number: MC145574AAC
• Description: IC TRANSCEIVER ISDN 32-LQFP
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of MC145574AAC

• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -
• Protocol: -
• Lead Free Status / Rohs Status: Compliant

Freescale Semiconductor, Inc.
Signal–to–Distortion Ratio (S/D) — The ratio of the input signal level to the level of all components that are present when
the input signal (usually a 1.020 kHz sinusoid) is eliminated from the output signal (e.g., by filtering).
SLIC — Subscriber Line Interface Circuit; a circuit that performs the 2–to–4 wire conversion, battery feed, line supervision, and
common mode rejection at the central office (or PBX) end of the telephone line.
SOG Package — Small–Outline Gull–wing package; formerly SOIC with gull–wing leads. This package has leads which fold
out from the body.
SOJ Package — Small–Outline J–lead package; formerly SOIC with J leads. This package has leads which are tucked under
the body.
Speech Network — A circuit that provides 2–to–4 wire conversion, i.e., connects the microphone and receiver (or the transmit
and receive paths) to the Tip and Ring phone lines. Additionally it provides sidetone control, and in many cases, the dc loop
current interface.
Subscriber Line — The system consisting of the user’s telephone, the interconnecting wires, and the central office equipment
dedicated to that subscriber (also referred to as a loop).
Switchhook — A synonym for hookswitch.
Syn (Sync) — (1) A bit character used to synchronize a time frame in a time–division multiplexer. (2) A sequence used by a
synchronous modem to perform bit synchronization or by a line controller for character synchronization.
Synchronous Modem — A modem that uses a derived clocking signal to perform bit synchronization with incoming data.
T1 Carrier — A PCM system operating at 1.544 MHz and carrying 24 individual voice–frequency channels.
TA — Terminal Adapter.
Talkdown — Missed signals in the presence of speech. Commonly used to describe the performance of a DTMF receiver when
it fails to recognize a valid DTMF tone due to cancellation of that tone by speech.
Talkoff — False detections caused by speech. Commonly used to describe the performance of a DTMF receiver when speech,
emulating DTMF, causes the receiver to believe it has detected a valid DTMF tone.
Tandem Trunk — See trunk.
Telephone Exchange — A switching center for interconnecting the lines that service a specific area.
TE1 — Terminal Equipment 1 (ISDN Terminal).
TE2 — Terminal Equipment 2 (Non–ISDN Terminal).
TELETEX — A text communication service between entirely electronic work stations that will gradually replace TELEX with the
introduction of the digital network. (Not to be confused with teletext.)
TELETEXT — The name usually used for broadcast text (and graphics) for domestic television reception. (Not to be confused
with teletex.)
Time–Division Multiplex — A process that permits the transmission of two or more signals over a common path by using a
different time interval for each signal.
Tin Cans and String — A crude analog communications system commonly used to introduce voice communications to children.
Tip — One of the two wires connecting the central office to a telephone. The name derives from the tip of the plugs used by
operators (in older equipment) to make the connection. Tip is traditionally positive with respect to ring.
Tone Ringer — The modern solid state equivalent of the old electromechanical bell. It provides the sound when the central
office alerts the subscriber that someone is calling. Ringing voltage is typically 80 – 90 volts rms, 20 Hz.
Trunk — A telephone circuit or channel between two central offices or switching entities.
TSAC — Time Slot Assigner Circuit; a circuit that determines when a CODEC will put its 8 bits of data on a PCM bit stream.
TSIC — Time Slot Interchange Circuit; a device that switches digital highways in PCM based switching systems; a “digital” cross-
point switch.
Twist — The amplitude ratio of a pair of DTMF tones. (Because of transmission and equipment variations, a pair of tones that
originated equal in amplitude may arrive with a considerable difference in amplitude.)
Two Wire Circuit — Refers to the two wires connecting the central office to the subscriber’s telephone. Commonly referred
to as Tip and Ring, the two wires carry both transmit and receive signals in a differential manner.
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