DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 21

• 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:
If enabled, this pin will be sampled on the falling edge of TCLK for data insertion into any combination
of the Sa bit positions (Sa4 to Sa8). See Section 18 for details. This signal is not bonded out in the
DS21FF44/DS21FT44.
Signal Name:
Signal Description:
Signal Type:
A pulse at this pin will establish either frame or multiframe boundaries for the transmit side. This pin can
also be programmed to output either a frame or multiframe pulse. Always synchronous with TCLK.
Signal Name:
Signal Description:
Signal Type:
Only used when the transmit side elastic store is enabled. A pulse at this pin will establish either frame or
multiframe boundaries for the transmit side. Should be connected low in applications that do not use the
transmit side elastic store. Always synchronous with TSYSCLK.
Signal Name:
Signal Description:
Signal Type:
When enabled, this input will sample signaling bits for insertion into outgoing PCM E1 data stream.
Sampled on the falling edge of TCLK when the transmit side elastic store is disabled. Sampled on the
falling edge of TSYSCLK when the transmit 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:
Updated on the rising edge of TCLK with the bipolar data out of the transmit side formatter. Can be
programmed to source NRZ data by the Output Data Format (TCR1.7) control bit.
Signal Name:
Signal Description:
Signal Type:
Updated on the rising edge of TCLK with the bipolar data out of the transmit side formatter.
RECEIVE SIDE PINS
Signal Name:
Signal Description:
Signal Type:
Updated with full recovered E1 data stream on the rising edge of RCLK. This signal is not bonded out in
the DS21FF44/DS21FT44.
RLINK
Receive Link Data
Output
TLINK
Transmit Link Data
Input
TSYNC
Transmit Sync
Input /Output
TSSYNC
Transmit System Sync
Input
TSIG
Transmit Signaling Input
Input
TPOS
Transmit Positive Data Output
Output
TNEG
Transmit Negative Data Output
Output
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