CY7B951 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – Local Area Network ATM Transceiver

1CY 7B9 51
CY7B951
Local Area Network ATM Transceiver
Features
• SONET/SDH and ATM Compatible
• Compatible with PMC-Sierra PM5345 SUNI™
• Clock and data recovery from 51.84- or 155.52-MHz
datastream
• 155.52-MHz clock multiplication from 19.44-MHz source
• 51.84-MHz clock multiplication from 6.48-MHz source
• ±1% frequency agility
• Line Receiver Inputs: No external buffering required
• Differential output buffering
• 100K ECL compatible I/O
• No output clock “drift” without data transitions
• Link Status Indication
• Loop-back testing
• Single +5V supply
• 24-pin SOIC
• Compatible with fiber-optic modules, coaxial cable, and
twisted pair media
• No external PLL components
• Power-down options to minimize power or crosstalk
• Low operating current: <65 mA
• 0.8µ BiCMOS
Functional Description
The Local Area Network ATM Transceiver is used in SO-
NET/SDH and ATM applications to recover clock and data in-
formation from a 155.52-MHz or 51.84-MHz NRZ or NRZI se-
rial data stream and to provide differential data buffering for the
Transmit side of the system.
Logic Block Diagram
LOOP(t)
MODE
ROUT+
ROUT-
RIN+
RIN-
CD
TOUT+
TOUT-
REFCLK+
PLL
RECEIVE
TRANSMIT
RCLK+
RCLK-
RSER+
RSER-
LFI(t)
PLL
x8
REFCLK-
TSER+
TSER-
TCLK+
TCLK-
7B951-1
Pin Configuration
ROUT+
ROUT-
RIN+
RIN-
MODE
V_CC
CD
LOOP
REFCLK-
REFCLK+
TOUT-
TOUT+
SOIC
Top View
1
24
2
23
3
22
4
21
5
20
6 _CY7B951 19
7
18
8
17
9
16
10
15
11
14
12
13
RCLK-
RCLK+
RSER-
RSER+
LFI
V_CC
V_SS
V_CC
TCLK-
TCLK+
TSER+
TSER-
7B951-2
Fiber or Copper ^{ReceiveSerial Data}
Media Interface
Carrier Detect
Fiber or Copper
Media Interface
Buffered Transmit
Data
CY7B951
SONET/
SDH
Link Fault Indication
Recovered Clock
Recovered Serial
Data
Serial
TransmitSerial Data
Transceiver
Bit Rate
Clock
Serial
to
Parallel
Conversion
and
Framing
Parallel
to
Serial
Conversion
SONET/
SDH
Overhead
Processing
ATM
Cell
Processing
ReceiveParallel Data
ReceiveStart of Cell
Read Strobe
Packet
Reassembly
or
ATMSwitch
Core
TransmitParallel Data
TransmitStart of Cell
Packet
Segmentation
Write Strobe
or
ATMSwitch
Core
Byte Rate
Oscillator
PMC-Sierra PM5345SUNI
IgTWAC-013
BrooktreeBT8222
Figure 1. SONET/SDH and ATM Interface
7B951-3
SUNI is a trademark of PMC-Sierra, Incorporated.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 1993 – Revised October 1995