DS21554LB+ Maxim Integrated Products, DS21554LB+ Datasheet - Page 109

• Manufacturer Part Number: DS21554LB+
• Description: IC TXRX E1 5V 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21554LB+

• Function: Single-Chip Transceiver
• Interface: E1, HDLC, J1, T1
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Includes: Remote and AIS Alarm Detector / Generator
• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 1.544 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current (max): 75 mA (Typ)
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Ic Interface Type: Parallel, Serial
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 100
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 18-14. DS21354/DS21554 Framer Synchronization Flowchart
RCR1.1 = 0
RLOS = 1
Resync if
Increment CRC4
Sync Counter;
CRC4SA = 0
CRC4 Resync
CAS Resync
Criteria Met;
Set CASRC
Criteria Met
(RIR.2)
Set FASRC
(RIR.0)
(RIR.1)
CRC4 Word Errors
FAS Resync
Criteria Met
Time
Check for >=915
8ms
Out
Out of 1000
Check for CAS
MF Word Error
109 of 124
CRC4 Multiframe Search
(if enabled via CCR1.0)
CRC4 Sync Criteria
Met; CRC4SA = 0;
(depends on RCR1.2)
Sync Counter
Reset CRC4
CRC4SA = 1
Check for FAS
Framing Error
If CRC4 is on
(CCR1.0 = 1)
(CCR1.3 = 0)
If CAS is on
Sync Declared
FAS Search
FASSA = 1
Criteria Met
FASSA = 0
RLOS = 1
RLOS = 0
Power Up
FAS Sync
CAS Multiframe Search
(if enabled via CCR1.3)
Criteria Met
CASSA = 0
CAS Sync
CASSA = 1