Motorola MC33121
The MC33121 is designed to provide the interface between the 4–wire side of a central office, or PBX, and the 2–wire subscriber line. The transmit and receive signals are referenced to analog ground, while digital signals are referenced to digital ground, easing the interface to codecs, filters, etc. The 2 status outputs (hookswitch and faults) and the Power Down Input are TTL/CMOS compatible.
| Part No. |
MC33121 |
| Datasheet |
MC33121
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| Manufacturer |
 Motorola |
| Description |
LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT |
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MAXIMUM RATINGS
Characteristic Supply Voltage (with respect to VCC) (with respect to VDG) Voltage @ PDI, (with respect to VDG) @ CP, CN EP, TSI BP RSI, EN BN Junction Temperature Storage Temperature Symbol VEE VDD Vin – 0.5, + 7.0 VEE – 0.5, VCC + 0.5 VCC – 7.0, VCC + 0.5 VCC – 14, VCC + 0.5 VEE – 0.5, VCC + 14 VEE – 1.0, VEE + 21 TJ Tstg 150 – 65 to + 150 °C °C Value – 60, + 0.5 – 0.5, + 7.0 Vdc Unit Vdc * Devices should not be operated at these limits. The “Recommended Operating Conditions” table provides for actual device operation. RECOMMENDED OPERATING CONDITIONS Characteristic Supply Voltage (with respect to VCC) (with respect to VDG) (with respect to VCC) (with respect to VCC) (with respect to VAG) (with respect to VEE) (with respect to VCC and VAG) Loop Current PDI Input Voltage Sink Current ST1 ST2 Transmit Signal Level at Tip & Ring Receive Signal Level at VRX Loop Resistance VEE = – 42 V VEE = – 24 V Symbol VEE VDD VAG VDG VDD IL VPDI IST1L IST2L STX SRX RL Hfe TA Min – 42 +...
