The MAX3172/MAX3174 contain five software-selectable multiprotocol cable termination networks. Each network is capable of terminating V.11 (RS-422, RS-530, RS-530A, RS-449, V.36, and X.21) with a 100Ω differential load, V.35 with a T-network load, or V.28 (RS-232) and V.10 (RS-423) with an open circuit load for use with transceivers having on-chip termination. The devices replace discrete resistor termination networks and expensive relays required for multiprotocol termination. The MAX3172/MAX3174, along with the MAX3170 and MAX3171/MAX3173, form a complete +3.3V software-selectable DTE or DCE interface port supporting V.11/RS-422, RS-530, RS-530A, V.36/RS-449, V.35, V.28/RS-232, V.10/RS-423, and X.21 serial interfaces. In addition to the five multiprotocol cable termination networks, the MAX3172/MAX3174 contain a 1Tx/1Rx multiprotocol transceiver designed to use V+ and V- generated by the MAX3171/MAX3173 charge pump. The MAX3172/MAX3174 transceiver is software selectable between V.10 and V.28 modes of operation. The MAX3172 features 10µs deglitching on the V.10/V.28 receiver input to facilitate unterminated operation, while the MAX3174 is used in applications that do not require deglitching on the serial handshake signals. These devices are available in a 28-pin SSOP package.
The MAX3172 and MAX3174 devices provide five software‑selectable multiprotocol cable termination networks and a 1‑Tx/1‑Rx transceiver. They support a wide range of serial standards including V.11 (RS‑422/RS‑530/RS‑530A/RS‑449/V.36/X.21), V.35, V.28 (RS‑232) and V.10 (RS‑423). The devices replace discrete resistor networks and relays, offering a compact 28‑pin SSOP solution.
Both parts are supplied in a 28‑pin SSOP package and operate from a +3.3 V supply. The MAX3172 includes a 10 µs deglitching feature on the receiver input, while the MAX3174 is intended for applications that do not require deglitching. A no‑cable mode reduces supply current to under 200 µA when all mode‑select pins are high.
| Package | 28‑Pin SSOP |
|---|---|
| Supply Voltage (VCC) | -0.3 V to +4 V |
| Receiver Input Deglitching (MAX3172) | 10 µs |