MAX9157 Quad Bus LVDS Transceiver

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The MAX9157 is a quad bus LVDS (BLVDS) transceiver for heavily loaded, half-duplex multipoint buses. Small 32-pin QFN and TQFP packages and flow-through pinouts allow the transceiver to be placed near the connector for the shortest possible stub length. The MAX9157 drives LVDS levels into a 27Ω load (double terminated, heavily loaded LVDS bus) at up to 200Mbps. An input fail-safe circuit ensures the receiver output is high when the differential inputs are open, or undriven and shorted, or undriven and terminated. The MAX9157 differential inputs feature 52mV hysteresis for greater immunity to bus noise and reflections. The MAX9157 operates from a single 3.3V supply, consuming 80.9mA supply current with drivers enabled, and 22.7mA with drivers disabled.

The MAX9157's high-impedance I/Os (except for receiver outputs) when V_CC = 0 or open, combined with glitch-free power-up and power-down, allow hot swapping of cards in multicard bus systems; 7.2pF (max) BLVDS I/O capacitances minimize bus loading.

The MAX9157 is offered in 5mm x 5mm 32-pin QFN and TQFP packages. The MAX9157 is fully specified for the -40°C to +85°C extended temperature range. Refer to the MAX9129 data sheet for a quad BLVDS driver, ideal for dual multipoint full-duplex buses.

Key Features

Applications/Uses

	32-TQFP and Space-Saving 32-QFN Packages
	52mV LVDS Input Hysteresis
	1ns (min) Transition Time (0% to 100%) Minimizes Reflections
	Guaranteed 7.2pF (max) Bus Load Capacitance
	Glitch-Free Power-Up and Power-Down
	Hot-Swappable, High-Impedance I/O with V_CC = 0 or Open
	Guaranteed 200Mbps Driver Data Rate
	Fail-Safe Circuit
	Flow-Through Pinout

	Add/Drop Multiplexers
	Cell Phone Base Stations
	Digital Cross-Connects
	DSLAM
	Multipoint Buses
	Network Routers and Switches

Key Specifications: High-Speed Interconnect (Differential Signaling)

Part Number

Features

Rx Signal Type

Tx Signal Type

Functions

Number of Rx

Number of Tx

Data Rates (Mbps)

Propagation Delay (max) (ps)

Supply Voltage (V)

Pulse Skew (max) (ps)

Channel-to-Channel Skew (max) (ps)

Output Transition Time (max) (ps)

ESD Protection (±kV)

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX9157

•	Bus LVDS I/O

•	Fail-Safe Inputs

•	Flow-Through Pinout

•	Rx Hi-Z at Power-Off

LVDS

•	Transceiver

200

4100

3.3

450

580

1,400

Yes

TQFP/32

$3.99 @ 1k

See All High-Speed Interconnect (Differential Signaling) (131)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.