DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 23

• Manufacturer Part Number: DS21FF44
• Description: IC FRAMER E1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF44

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Signal Name:
Signal Description:
Signal Type:
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 (DS21Q43 emulation). This signal is not bonded
out in the DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
1.544MHz or 2.048MHz clock. Only used when the elastic store function is enabled. Should be
connected low in applications that do not use the elastic store. Can be burst at rates up to 8.192MHz. This
pin is connected to the TSYSCLK signal in the DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
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 connected to ground for the DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
A dual function output that is controlled by the TCR2.0 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 5µs. This function is available when FMS = 1 (DS21Q43 emulation).
This signal is not bonded out in the DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
A 2.048MHz reference clock used in the generation of 8MCLK. This function is available when
FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
An 8.192MHz output clock that is referenced to the clock that is input at the CLKSI pin. This function is
available when FMS = 0. FMS is connected to ground for the DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and
RNEG can be connected together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar
violation monitoring circuitry.
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
8MHz Clock Reference
Input
8MCLK
8 MHz Clock
Output
RPOS
Receive Positive Data Input
Input
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