SP505 Datasheet, PDF (17/35 Pages) Sipex Corporation – WAN Multi-Mode Serial Transceiver

Pin 45 — RL(b) — Remote Loopback; analog
output, non-inverted; sourced from RL.
Pin 47 — RL(a) — Remote Loopback; 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
Pin 78 — DSR— Data Set Ready; TTL output;
sourced from DM(a), DM(b) inputs.
Pin 80 — CTS— Clear To Send; TTL output;
sourced from CS(a) and CS(b) inputs.
Pin 7 — SCTEN — Enables SCT receiver;
active high; TTL input.
Pin 8 — LATCH — Latch control for decoder
bits (pins 9-12), active low. Logic high input
will make decoder transparent.
Pins 12–9 — DEC₀ – DEC₃ — Transmitter and
receiver decode register; configures trans-
mitter and receiver modes; TTL inputs.
Pin 18 — RLEN — Enables RL driver; active
low; TTL input.
Pin 23 — STEN — Enables ST driver; active
low; TTL input.
POWER SUPPLIES
Pins 25, 33, 41, 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 +10V Charge Pump Capacitor
— Connects from V_DD to V_CC. Suggested
capacitor size is 22µF, 16V.
Pin 32 — V_SS –10V Charge Pump Capacitor
— Connects from ground to V_SS. Suggested
capacitor size is 22µF, 16V.
Pins 26 and 30 — C₁₊ and C_1– — Charge
Pump Capacitor — Connects from C₁₊ to C_1–.
Suggested capacitor size is 22µF, 16V.
Pins 28 and 31 — C₂₊ and C_2– — Charge
Pump Capacitor — Connects from C₂₊ to C_2–.
Suggested capacitor size is 22µF, 16V.
CONTROL REGISTERS
Pins 2 — SDEN — Enables TxD driver,
active low; TTL input.
Pins 3 — TREN — Enables DTR driver,
active low; TTL input.
Pins 4 — RSEN — Enables RTS driver,
active low; TTL input.
Pins 5 — LLEN — Enables LL driver, active
low; TTL input.
Pin 6 — TTEN — Enables TT driver, active
low; TTL input.
Exar Coporation 48720 Kato Road, Fremont CA, 94538 • [phone] • Fax [phone] • www.exar.com
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