DS21FT42 Maxim Integrated Products, DS21FT42 Datasheet - Page 22

• Manufacturer Part Number: DS21FT42
• Description: IC FRAMER T1 4X3 12CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FT42

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 225mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

An extracted pulse, one RSYSCLK wide, is output at this pin which identifies multiframe boundaries. If
the receive side elastic store is disabled, then this output will output multiframe boundaries associated
with RCLK. This function is available when FMS = 1 (DS21Q41 emulation). This signal is not bonded
out in the DS21FF42/DS21FT42.
1.544 MHz or 2.048 MHz clock. Only used when the elastic store function is enabled. Should be tied
low in applications that do not use the elastic store. Can be burst at rates up to 8.192 MHz. This pin is
tied to the TSYSCLK signal in the DS21FF42/DS21FT42.
Outputs signaling bits in a PCM format. Updated on rising edges of RCLK when the receive side elastic
store is disabled. Updated on the rising edges of RSYSCLK when the receive side elastic store is
enabled. This function is available when FMS = 0. FMS is tied to ground for the DS21FF42/DS21FT42.
A dual function output that is controlled by the CCR3.5 control bit. This pin can be programmed to
either toggle high when the synchronizer is searching for the frame and multiframe or to toggle high if the
TCLK pin has not been toggled for 5 usec. This function is available when FMS = 1 (DS21Q41
emulation). This signal is not bonded out in the DS21FF42/DS21FT42.
A 1.544 MHz reference clock used in the generation of 8MCLK. This function is available when FMS =
0. FMS is tied to ground for the DS21FF42/DS21FT42.
A 8.192 MHz output clock that is referenced to the clock that is input at the CLKSI pin. This function is
available when FMS = 0. FMS is tied to ground for the DS21FF42/DS21FT42.
Signal Name:
Signal Description:
Signal Type:
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Signal Description:
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Signal Description:
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Signal Type:
RMSYNC
Receive Multiframe Sync
Output
RSYSCLK
Receive System Clock
Input
RSIG
Receive Signaling Output
Output
RLOS/LOTC
Receive Loss of Sync / Loss of Transmit Clock
Output
CLKSI
8 MHz Clock Reference
Input
8MCLK
8 MHz Clock
Output
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