SN74ACT8990FN - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

SN74ACT8990FN
Manufacturer

TI
ChipWorker Part#

CW54563896
Category

Logic Control, Logic Gate IC
Package

PLCC-44
Description

Test-Bus Controllers IEEE Std 1149.1 (JTAG) TAP Masters With 16Bit Generic Host Interfaces 44-PLCC -40℃ to 85℃
Documentation

Datasheet

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SN74ACT8990FN Specifications

Attribute	Attribute Value

Part Number	SN74ACT8990FN
Manufacturer	TI
ChipWorker Part#	CW54563896
Category	Logic Control, Logic Gate IC
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	44 Pin
Case/Package	PLCC-44
Supply Voltage (DC)	4.50V ~ 5.50V
Output Current	8.00 mA
Number of Bits	16 Bit
Voltage Nodes	5.00 V
Operating Temperature (Max)	85 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage	4.5V ~ 5.5V
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Operating Temperature	0℃ ~ 70℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
ECCN Code	EAR99

Product Description

The "ACT8990 test-bus controllers (TBC) are members of the Texas Instruments SCOPETM testability integrated-circuit family. This family of components supports IEEE Standard 1149.1-1990 (JTAG) boundary scan to facilitate testing of complex circuit-board assemblies. The "ACT8990 differ from other SCOPETM integrated circuits. Their function is to control the JTAG serial-test bus rather than being target boundary-scannable devices.
The required signals of the JTAG serial-test bus - test clock (TCK), test mode select (TMS), test data input (TDI), and test data output (TDO) can be connected from the TBC to a target device without additional logic. This is done as a chain of IEEE Standard 1149.1-1990 boundary-scannable components that share the same serial-test bus. The TBC generates TMS and TDI signals for its target(s), receives TDO signals from its target(s), and buffers its test clock input (TCKI) to a test clock output (TCKO) for distribution to its target(s). The TMS, TDI, and TDO signals can be connected to a target directly or via a pipeline, with a retiming delay of up to 31 bits. Since the TBC can be configured to generate up to six separate TMS signals [TMS (5-0)], it can be used to control up to six target scan paths that are connected in parallel (i.e., sharing common TCK, TDI, and TDO signals).
While most operations of the TBC are synchronous to TCKI, a test-off (TOFF\\\\) input is provided for output control of the target interface, and a test-reset (TRST\\\\) input is provided for hardware/software reset of the TBC. In addition, four event [EVENT (3-0)] I/Os are provided for asynchronous communication to target device(s). Each event has its own event generation/detection logic, and detected events can be counted by two 16-bit counters.
The TBC operates under the control of a host microprocessor/microcontroller via the 5-bit address bus [ADRS (4-0)] and the 16-bit read/write data bus [DATA (15-0)]. Read (RD\\\\) and write (WR\\\\) strobes are implemented such that the critical host-interface timing is independent of the TCKI period. Any one of 24 registers can be addressed for read and/or write operations. In addition to control and status registers, the TBC contains two command registers, a read buffer, and a write buffer. Status of the TBC is transmitted to the host via ready (RDY\\\\) and interrupt (INT\\\\) outputs.
Major commands can be issued by the host to cause the TBC to generate the TMS sequences necessary to move the target(s) from any stable test-access-port (TAP) controller state to any other stable TAP state, to execute instructions in the Run-Test/Idle TAP state, or to scan instruction or test data through the target(s). A 32-bit counter can be preset to allow a predetermined number of execution or scan operations.
Serial data that appears at the selected TDI input (TDI1 or TDI0) is transferred into the read buffer, which can be read by the host to obtain up to 16 bits of the serial-data stream. Serial data that is transmitted from the TDO output is written by the host to the write buffer.
The SN54ACT8990 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ACT8990 is characterized for operation from 0°C to 70°C.
NC - No internal connection

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