DS21FT42 Maxim Integrated Products, DS21FT42 Datasheet - Page 23

• 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

Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and
RNEG can be tied together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar
violation monitoring circuitry.
Sampled on the falling edge of RCLK for data to be clocked through the receive side framer. RPOS and
RNEG can be tied together for an NRZ interface. Connecting RPOS to RNEG disables the bipolar
violation monitoring circuitry.
Clock used to clock data through the receive side framer.
PARALLEL CONTROL PORT PINS
Flags host controller during conditions and change of conditions defined in the Status Registers 1 and 2
and the HDLC Status Register. Active low, open drain output.
Set low to select DS21Q42 feature set. Set high to select DS21Q41 emulation. FMS is tied to ground for
the DS21FF42/DS21FT42.
Set low to select non–multiplexed bus operation. Set high to select multiplexed bus operation.
In non–multiplexed bus operation (MUX = 0), serves as the data bus. In multiplexed bus operation
(MUX = 1), serves as a 8–bit multiplexed address / data bus.
Signal Name:
Signal Description:
Signal Type:
Signal Name:
Signal Description:
Signal Type:
Signal Name:
Signal Description:
Signal Type:
Signal Name:
Signal Description:
Signal Type:
Signal Name:
Signal Description:
Signal Type:
Signal Name:
Signal Description:
Signal Type:
Signal Name:
Signal Description:
Signal Type:
RPOS
Receive Positive Data Input
Input
RNEG
Receive Negative Data Input
Input
RCLK
Receive Clock Input
Input
INT*
Interrupt
Output
FMS
Framer Mode Select
Input
MUX
Bus Operation
Input
D0 to D7/ AD0 to AD7
Data Bus or Address/Data Bus
Input /Output
23 of 114