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SP504 Datasheet(PDF) 13 Page - Exar Corporation |
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SP504 Datasheet(HTML) 13 Page - Exar Corporation |
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13 / 32 page  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP504_02_2708 3 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP504_02_2708 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP504_02_2708 Pin 40 — IC(b)— Incoming Call; analog input,non-inverted; source for RI. Pin45—RL(b)—RemoteLoopback;analog output, non-inverted; sourced from RL. Pin47—RL(a) —RemoteLoopback;analog output inverted; sourced from RL. Pin 49— LL(b) — Local Loopback; analog output, non-inverted; sourced from LL. Pin 51 — LL(a) — Local Loopback; analog output, inverted; sourced from LL. Pin 52 — RS(b) — Ready To Send; analog output, non-inverted; sourced from RTS. Pin 54 — RS(a) — Ready To Send; analog output, inverted; sourced from RTS. Pin 56 — TR(b) — Terminal Ready; analog output, non-inverted; sourced from DTR. Pin 58 — TR(a) — Terminal Ready; analog output, inverted; sourced from DTR. Pin 66 — CS(a)— Clear To Send; analog input, inverted; source for CTS. Pin 67 — CS(b)— Clear To Send; analog input, non-inverted; source for CTS. Pin 68 — DM(a)— Data Mode; analog input, inverted; source for DSR. Pin 69 — DM(b)— Data Mode; analog input, non-inverted; source for DSR Pin78—DSR—DataSetReady;TTLoutput; sourced from DM(a), DM(b) inputs. Pin 80 — CTS— Clear To Send; TTLoutput; sourced from CS(a) and CS(b) inputs. CONTROL REGISTERS Pins 2–5 — RDEC 0 – RDEC3 — Receiver decode register; configures receiver modes; TTL inputs. Pin 6 — TTEN — Enables TT driver, active low; TTL input. Pin 7 — SCTEN — Enables SCT receiver; active high; TTL input. Pins 2–9 — TDEC 0 – TDEC3 — Transmit- ter decode register; configures transmitter modes; TTL inputs. Pin 23 — STEN — Enables ST driver; active low; TTL input. POWER SUPPLIES Pins 25, 33, 4, 48, 55, 62, 73, 74 — V CC — +5V input. Pins 29, 34, 43, 46, 50, 53, 57, 60, 64, 72, 75 — GND — Ground. Pin 27 — V DD +0V Charge Pump Capacitor — Connects from V DD to VCC. Suggested capacitor size is 22µF, 6V. Pin 32 — V SS –0V Charge Pump Capacitor — Connects from ground to V SS. Suggested capacitor size is 22µF, 6V. Pins 26 and 30 — C + and C – — Charge PumpCapacitor —ConnectsfromC + toC – . Suggested capacitor size is 22µF, 6V. Pins 28 and 3 — C 2 + and C 2 – — Charge PumpCapacitor —ConnectsfromC 2 + toC 2 – . Suggested capacitor size is 22µF, 6V. NOTE: NC pins should be left floating; in- ternal signals may be present. |
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