Typical Ethernet Switch Systems
The top network equipment manufacturers
use multiple Pericom devices in their products. See Fig. 1 for
a generic overview of the Gigabit Ethernet Switch system.
| FIG. 1 |
 |
GB Ethernet Solutions
A typical Ethernet switch can be looked at on 2 different levels:
Control & Data
(fig. 2), and Clock & Timing (fig 3). Pericom has solutions for each
of these 2 levels of timing and control needs.
| FIG. 2 |
FIG. 3
|
 |
Pericom devices that are used in both of these needs for Gigabit
Ethernet Switches fall under two types of product:
These devices are used for Clock/Timing needs in a switch to provide
low jitter CMOS/TTL and LVPECL solutions with improved performance
at a lower cost:
S1613, S1613XP, S1614, S1614XP Series
 5x7mm
Ceramic Package
3.3V
and 2.5V CMOS/TTL
Features
for >100 MHz include
 < 1ps
RMS jitter
±25ppM
(0/+70°C), ±50ppM (-40/+85°C)
30mA
max
S1633, S1634 Series
3.2x5mm
Ceramic Package
3.3V
and 2.5V CMOS/TTL
5ps
RMS max Accumulated jitter
±25ppM
(0/+70°C), ±50ppM (-40/+85°C)
SEL383, SEL382 Series
5x7mm
Ceramic Package
3.3V
PECL to 212.5 MHz (SEL383)*
2.5V
PECL to 160 MHz (SEL382)**
25ps
pk-pk; 5ps accum typ* jitter @ 212.5Mhz
0.5ps
typ RMS jitter 12KHz-40Mhz
±25ppM
(0/+70°C), ±50ppM (-40/+85°C)
60mA
max
Pericom PCI Bridges are used for both Clock/Timing Solutions
as well as for Control & Data in Gigabit Ethernet Switches.
PI7C8152A & PI7C8152B are 32-bit / 66MHz 2-Port PCI Bridges with the following features:
Dynamic
Prefetching Control
Enhanced
performance on PI7C8152A
Enhanced
performance & asynchronous support on PI7C8152B
Support
for 4 secondary bus masters
5V
and 3.3V signaling
PI7C8150A & PI7C8150B are 32-bit /
66MHz 2-port PCI Bridge with the following features:
Supports
4 secondary bus masters
Dynamic
Prefetching Control
Enhanced
performance on PI7C8150A
Enhanced
performance & asynchronous support on PI7C8150B
Support
for 9 secondary bus masters
5V
and 3.3V signaling
PI7C21P100 is a 64-bit/133MHz 2-port PCI-X
Bridge with the following features:
Tundra
TSI310a is compatible
High
Performance and Enhanced Features
5V
Tolerance and Lower Power
Dynamic
Prefetching
Configurable
Free Space in the Memory Data FIFO
Able
to support 3 slots running 133MHz
PI7C8154A & PI7C8154B are 64-bit
/ 66MHz 2-port PCI Bridges with the following features:
Dynamic
Prefetching Control
Asynchronous
Mode support on PI7C8154B
Serial
EEPROM support
80MHz
secondary support on PI7C8154B-80
Only
known PCI bridge to support 80MHz in conventional PCI Mode
Used for Clocking/Timing and for Control & Data within
the Switch System. Pericom offers complete solutions for all
memory module configurations with next generation PLL Clock
Drivers, and Registered Logic Buffers
DDR1
PC1600/PC2100(DDR200/266)
PC2700(DDR333)
PC3200
DDR2
PC2-3200/4300(DDR2-400/533)
PC2-5300(DDR2-667)
Pericom offers the highest performance digital
bus switches in the industry. These 2-port mux/demux
digital switches are used for Control & Data
within the Gigabit Ethernet Switch.
PI3Cxxxx and PI5Cxxx
Mux/Demux
2.5V & 3.3V 2 port switch products
Supply Voltage Operation: 2.5V & 3.3V
Beyond Rail–to–Rail switching (5V I/O Tolerant)
2-port switch products: 5-ohm / 5pF
Mux / Demux switch products: 5-ohm / 10pF
Enable times: 3-5ns max (others)
Broad Band: 200 to 500MHz
Live Insertion & No sensitivity to Power Supply sequencing
Undershoot Protection: -2V tolerant (where needed)
Near Zero Prop Delay: 250ps typical
Pericom’s Microprocessor (µP) Supervisor Circuits,
offer precision supply voltage monitoring. In a Gigabit Ethernet
Switch system its function is Control & Data (see fig.4):
PI4S70xx
with Independent Watchdog Timer Output
Precision
Supply -Voltage Monitor at 200ms Reset Pulse Width
Reset
is Active High & Active Low
Guaranteed
RESET Valid at Vcc > 1.2V
Power-Fail
or Low Battery Detection
Debounced
TTL/CMOS Manual Reset Input
Pericom’s Voltage Level Shifters can be used for Control & Data
within the Gigabit Ethernet Switch design (fig. 5). These devices
and their features are as follows:
PI4ULS3Vxx
56 Contact TQFN: 11 x 5mm
Vcc Range: -0.5V to +4.6V
Voltage levels:1.1V to 3.6V on either port
Configurations: 32-bit, 16-bit, 8-bit, 4-bit, 2-bit
Bandwidth: 160Mbps
Featuring the added value of
Voltage translation
without direction pin
Within bus
applications, it is difficult to generate separate control signals.
*Samples
available February 2005, with Production in late March 2005
PI74AUCxxx / PI74AVCxxx
/ PI49FCTxxx offer great Chip-to-Chip
interface between:
Differential
I/O Voltages
1.5/1.8/2.5/3.3V
to 5V
0.8V
to 2.5V
Different
I/O Standards
HSTL
to LVTTL / LVCMOS, SSTL to TTL, etc.
These clock converter/distributor devices available with single-ended
and differential inputs perform the Clocking/Timing function within
a Switch system:
Multiple Products (see Fig. 6)
1
to 20 Outputs
160MHz
to 800MHz
1.5V
to 3.3V
LVPECL,
LVDS, and LVCMOS outputs
These devices are used for Clocking/Timing and for
Control & Data within the Gigabit Switch System.
These offer support of multiple ports as in docking
station applications.
PI6C24xx
General Purpose Zero Delay Buffer
3.3V, TTL, 140 MHz, 100ps Jitter, 200ps Skew
PI6C25xx
Zero Delay Buffer for Memory Clock Distribution
3.3V, CMOS, 150 MHz, 75ps Jitter, 150ps Skew
PI6C29xx
Zero Delay Buffer for Networking
3.3V, 250 MHz
PI6C484321 260 MHz Crystal
to Dual LVPECL Differential Clock Synthesizer
Useful
in generating 125 MHz, 156.25 MHz clock frequencies
PI6C45x
general purpose multipliers
General purpose clock multipliers (x4,16/3,5,2.5,2,6,3,8,10/3)
160MHz
to 800MHz
1.5V
to 3.3V
LVPECL,
LVDS, and LVCMOS outputs
These Zero-Delay Clock Driver/Buffers are used for Clocking/Timing
in the Switch System:
PI6C487020 (Fig. 7)
Individually Configurable LVCMOS Outputs
1.5V to 3.3V
Flexible Dividers (/2, /4, /5)
20 outputs (4x5)
170ps Skew
250MHz Output Freq
Differential Inputs
PI6C487016
Individually
Configurable LVCMOS Outputs
1.8V
to 3.3V
Flexible
Dividers (/2, /4, /5)
16
outputs (4x5)
170ps
Skew
250MHz
Output Freq
Differential
Inputs
PI49FCT2080x (PI49FCT380x) Family for General Purpose
2.5V (3.3V), 150 MHz, 150ps Skew, TTL/CMOS I/O, 5-10 Outputs
PI6C18551
160MHz,
4 LVCMOS outputs at 2.5V and 3.3V
PI6C41580-01*
220MHz,
Dual input, 2.5-5V glitch-free multiplexer
PI6C4853x LVPECL (6C4854x LVDS) Clock Buffers
800MHz,
50ps skew, 1~16 outputs
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