UT32BS1X833 Datasheet, PDF (1/17 Pages) Aeroflex Circuit Technology – UT32BS1X833 Matrix-DTM 32-Channel 1 - 8 Bus Switch

Standard Products
UT32BS1X833 Matrix-D™ 32-Channel 1:8 Bus Switch
Advanced Data Sheet
November 12, 2014
www.aeroflex.com/busswitch
FEATURES
 Interfaces to standard processor memory busses
 Single-chip interface that provides memory paging to
industry-standard SDRAMS
 Eliminates need for additional logic or FPGA
 I/O channels functional to 3.3V
 R_ON 5 Ohms typical
 Flat R_ON characteristics over channel voltage
 Propagation delay 300ps through switch
 Transmission gate technology allows for true bi-directional
operation
 Internal pull-up resistors on the first 8 outputs of each bank
to ensure memory devices remain in off state when channels
de-selected
 Bus holders maintain output states on all other outputs when
channels de-selected
 Logic power 1mW/MHz
 Temperature range -55°C to 125°C
 Operational environment:
- Intrinsic total-dose: up to 300 krad(Si)
- SEL Immune <100 MeV-cm²/mg
 Packaging options:
- 400-pin Ceramic Land Grid, Column Grid and Ball
Grid Array packages; 1mm pitch
 Standard Microcircuit Drawing 5962-TBD
- QML Q and V (pending)
APPLICATIONS
- Microprocessor interfaces that require large amounts of
SDRAM memory
- High-speed applications or systems with large bus
capacitance
- Cost-sensitive applications that require bus isolation
without an expensive FPGA
- Large SDRAM paging architecture
INTRODUCTION
The UT32BS1X833 Matrix-D™ is a 32-Channel, 1:8 Bus
Switch, that provides bus isolation for up to eight banks of 32 I/
O connections. By providing bus isolation, the UT32BS1X833
can significantly reduce the amount of load capacitance seen by
a host processor and memory devices. The enable to output delay
time is only 4.1ns (typical). The reduction in both load
capacitance and delay time significantly increase speed and
performance compared with a discrete logic or FPGA memory
interface solution.
The UT32BS1X833 operates from a single 3.3V supply. The
bus channels can pass any voltage between V_SS and V_DD,
allowing the switching of signals using other standards, such as
LVCMOS 1.8V. The input and output banks connect via analog
channels that have an R_ON that is nominally 5 Ohms over the
entire input voltage range. The flat R_ON eliminates the need to
add external series resistors for source impedance termination.
The UT32BS1X833 has a “broadcast mode” that is enabled by
driving both SDCS[1] and SDCS[0] low. In this mode, all banks
are active, which facilitates SDRAM refresh and initialization
cycles.
Each UT32BS1X833 can interface up to eight of the Aeroflex
2.5Gb or 3.0Gb SDRAM MCM devices with any Aeroflex
LEON processor without the need for additional logic.
36-00-03-002
1
Aeroflex Microelectronics Solutions - HiRel