19-2287; Rev 0; 1/02
Quad Bus LVDS Transceiver
General Description
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 con-
nector for the shortest possible stub length. The
MAX9157 drives LVDS levels into a 27鈩?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, consum-
ing 80.9mA supply current with drivers enabled, and
22.7mA with drivers disabled.
The MAX9157鈥檚 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
鉁?/div>
5mm 32-pin QFN and
TQFP packages. The MAX9157 is fully specified for the
-40擄C to +85擄C extended temperature range. Refer to
the MAX9129 data sheet for a quad BLVDS driver, ideal
for dual multipoint full-duplex buses.
o
52mV LVDS Input Hysteresis
o
1ns (min) Transition Time (0% to 100%) Minimizes
Reflections
o
Guaranteed 7.2pF (max) Bus Load Capacitance
o
Glitch-Free Power-Up and Power-Down
o
Hot-Swappable, High-Impedance I/O with V
CC
= 0
or Open
o
Guaranteed 200Mbps Driver Data Rate
o
Fail-Safe Circuit
o
Flow-Through Pinout
Features
o
32-TQFP and Space-Saving 32-QFN Packages
MAX9157
Ordering Information
PART
MAX9157EGJ
MAX9157EHJ
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
32 QFN (5mm
鉁?/div>
5mm)
32 TQFP (5mm
鉁?/div>
5mm)
Applications
Add/Drop Muxes
Digital Cross-Connects
Network
Switches/Routers
Cellular Phone Base
Stations
DSLAMs
Multipoint Buses
Pin Configurations appear at end of data sheet.
Functional Diagram appears at end of data sheet.
Typical Operating Circuit
MAX9157
CARD 1
MAX9157
CARD 15
MAX9157
CARD 16
1in CARD
SPACING
Rt = 54鈩?/div>
Rt = 54鈩?/div>
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
MAX9157 PDF文件相關(guān)型號(hào)
MAX9157EGJ,MAX9157EHJ
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