DS21FF42 Maxim Integrated Products, DS21FF42 Datasheet - Page 25

• Manufacturer Part Number: DS21FF42
• Description: IC FRAMER T1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF42

• Controller Type: T1 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

This signal is used to asynchronously reset the test access port controller. At power up, JTRST* must be
set low and then high. This action will set the device into the DEVICE ID mode allowing normal device
operation. If boundary scan is not used and FMS = 0, this pin should be held low. This function is
available when FMS = 0. When FMS=1, this pin is held LOW internally. This pin is pulled up internally
by a 10K ohm resistor. FMS is tied to ground for the DS21FF42/DS21FT42.
This pin is sampled on the rising edge of JTCLK and is used to place the test port into the various defined
IEEE 1149.1 states. This pin is pulled up internally by a 10K ohm resistor. If not used, this pin should
be left unconnected. This function is available when FMS = 0. FMS is tied to ground for the
DS21FF42/DS21FT42.
This signal is used to shift data into JTDI pin on the rising edge and out of JTDO pin on the falling edge.
If not used, this pin should be connected to VSS. This function is available when FMS = 0. FMS is tied
to ground for the DS21FF42/DS21FT42.
Test instructions and data are clocked into this pin on the rising edge of JTCLK. This pin is pulled up
internally by a 10K ohm resistor. If not used, this pin should be left unconnected. This function is
available when FMS = 0. FMS is tied to ground for the DS21FF42/DS21FT42.
Test instructions and data are clocked out of this pin on the falling edge of JTCLK. If not used, this pin
should be left unconnected. This function is available when FMS = 0. FMS is tied to ground for the
DS21FF42/DS21FT42.
SUPPLY PINS
2.97 to 3.63 volts.
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:
JTRST*
IEEE 1149.1 Test Reset
Input
JTMS
IEEE 1149.1 Test Mode Select
Input
JTCLK
IEEE 1149.1 Test Clock Signal
Input
JTDI
IEEE 1149.1 Test Data Input
Input
JTDO
IEEE 1149.1 Test Data Output
Output
VDD
Positive Supply
Supply
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