鈥?/div>
鹵1%
frequency agility
鈥?Line Receiver Inputs: No external buffering required
鈥?Differential output buffering
鈥?100K ECL compatible I/O
鈥?No output clock 鈥渄rift鈥?without data transitions
鈥?Link Status Indication
鈥?Loop-back testing
鈥?Single +5V supply
鈥?24-pin SOIC
鈥?Compatible with fiber-optic modules, coaxial cable, and
twisted pair media
鈥?No external PLL components
鈥?Power-down options to minimize power or crosstalk
鈥?Low operating current: <65 mA
鈥?/div>
0.8碌 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
Pin Configuration
SOIC
Top View
ROUT+
ROUT-
RIN+
RIN-
MODE
V
CC
CD
LOOP
REFCLK-
REFCLK+
TOUT-
TOUT+
1
2
3
4
5
6
7
8
9
10
11
12
CY7B951
24
23
22
21
20
19
18
17
16
15
14
13
ROUT+
ROUT-
RIN+
RIN-
RCLK+
RCLK-
RSER+
RSER-
LFI(t)
RECEIVE
TRANSMIT
TOUT+
TOUT-
PLL
x8
TCLK+
TCLK-
7B951-1
PLL
CD
RCLK-
RCLK+
RSER-
RSER+
LFI
V
CC
V
SS
V
CC
TCLK-
TCLK+
TSER+
TSER-
7B951-2
TSER+
TSER-
REFCLK+
REFCLK-
Fiber or Copper ReceiveSerial Data
Media Interface
Carrier Detect
CY7B951
SONET/
SDH
Serial
Transceiver
Link Fault Indication
RecoveredClock
RecoveredSerial
Data
TransmitSerial Data
Bit Rate
Clock
Serial
to
Parallel
Conversion
and
Framing
Parallel
to
Serial
Conversion
ReceiveParallel Data
ReceiveStart of Cell
Read Strobe
SONET/
SDH
Overhead
Processing
ATM
Cell
Processing
Packet
Reassembly
or
ATMSwitch
Core
Packet
Segmentation
or
ATMSwitch
Core
TransmitParallelData
TransmitStart of Cell
Write Strobe
Fiber or Copper
Media Interface
Buffered Transmit
Data
PMC-Sierra PM5345SUNI
Byte Rate
Oscillator
IgTWAC-013
BrooktreeBT8222
Figure 1. SONET/SDH and ATM Interface
7B951-3
SUNI is a trademark of PMC-Sierra, Incorporated.
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?/div>
408-943-2600
July 1993 鈥?Revised October 1995
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