DS21Q42T View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

MFG CO.

DS21Q42T

Enhanced QUAD T1 FRAMER

Dallas Semiconductor -> Maxim Integrated 

DS21Q42

Signal Name: JTRST*

Signal Description: IEEE 1149.1 Test Reset

Signal Type: Input

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.

Signal Name: JTMS

Signal Description: IEEE 1149.1 Test Mode Select

Signal Type: Input

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.

Signal Name: JTCLK

Signal Description: IEEE 1149.1 Test Clock Signal

Signal Type: Input

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.

Signal Name: JTDI

Signal Description: IEEE 1149.1 Test Data Input

Signal Type: Input

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.

Signal Name: JTDO

Signal Description: IEEE 1149.1 Test Data Output

Signal Type: Output

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.

SUPPLY PINS

Signal Name: VDD

Signal Description: Positive Supply

Signal Type: Supply

2.97 to 3.63 volts.

Signal Name: VSS

Signal Description: Signal Ground

Signal Type: Supply

0.0 volts.

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